| 1. |
- Aguiar, A., et al.
(författare)
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Practices in prescribing protein substitutes for PKU in Europe : No uniformity of approach
- 2015
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192 .- 1096-7206. ; 115:1, s. 17-22
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Tidskriftsartikel (refereegranskat)abstract
- Background: There appears little consensus concerning protein requirements in phenylketonuria (PKU). Methods: A questionnaire completed by 63 European and Turkish IMD centres from 18 countries collected data on prescribed total protein intake (natural/intact protein and phenylalanine-free protein substitute [PS]) by age, administration frequency and method, monitoring, and type of protein substitute. Data were analysed by European region using descriptive statistics. Results: The amount of total protein (from PS and natural/intact protein) varied according to the European region. Higher median amounts of total protein were prescribed in infants and children in Northern Europe (n = 24 centres) (infants <1 year, >2-3 g/kg/day; 1-3 years of age, >2-3 g/kg/day; 4-10 years of age, >1.5-2.5 g/kg/day) and Southern Europe (n = 10 centres) (infants <1 year, 2.5 g/kg/day, 1-3 years of age, 2 g/kg/day; 4-10 years of age, 1.5-2 g/kg/day), than by Eastern Europe (n = 4 centres) (infants <1 year, 2.5 g/kg/day, 1-3 years of age, >2-2.5 g/kg/day; 4-10 years of age, >1.5-2 g/kg/day) and with Western Europe (n = 25 centres) giving the least (infants <1 year, >2-2.5 g/kg/day, 1-3 years of age, 1.5-2 g/kg/day; 4-10 years of age, 1-1.5 g/kg/day). Total protein prescription was similar in patients aged >10 years (1-1.5 g/kg/day) and maternal patients (1-1.5 g/kg/day). Conclusions: The amounts of total protein prescribed varied between European countries and appeared to be influenced by geographical region. In PKU, all gave higher than the recommended 2007 WHO/FAO/UNU safe levels of protein intake for the general population.
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| 2. |
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| 3. |
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| 4. |
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| 5. |
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| 6. |
- Dobritzsch, Doreen, 1972-, et al.
(författare)
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beta-Ureidopropionase deficiency due to novel and rare UPB1 mutations affecting pre-mRNA splicing and protein structural integrity and catalytic activity
- 2022
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier. - 1096-7192 .- 1096-7206. ; 136:3, s. 177-185
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Tidskriftsartikel (refereegranskat)abstract
- beta-Ureidopropionase is the third enzyme of the pyrimidine degradation pathway and catalyses the conversion of N-carbamyl-beta-alanine and N-carbamyl-beta-aminoisobutyric acid to beta-alanine and beta-aminoisobutyric acid, ammonia and CO2. To date, only a limited number of genetically confirmed patients with a complete beta-ureidopropionase deficiency have been reported. Here, we report on the clinical, biochemical and molecular findings of 10 newly identified beta-ureidopropionase deficient individuals. Patients presented mainly with neurological abnormalities and markedly elevated levels of N-carbamyl-beta-alanine and N-carbamyl-beta-aminoisobutyric acid in urine. Analysis of UPB1, encoding beta-ureidopropionase, showed 5 novel missense variants and two novel splice-site variants. Functional expression of the UPB1 variants in mammalian cells showed that recombinant beta-ureidopropionase carrying the p.Ala120Ser, p.Thr129Met, p.Ser300Leu and p.Asn345Ile variant yielded no or significantly decreased beta-ureidopropionase activity. Analysis of the crystal structure of human beta-ureidopropionase indicated that the point mutations affect substrate binding or prevent the proper subunit association to larger oligomers and thus a fully functional beta-ureidopropionase. A minigene approach showed that the intronic variants c.[364 + 6 T > G] and c.[916 + 1_916 + 2dup] led to skipping of exon 3 and 8, respectively, in the process of UPB1 pre-mRNA splicing. The c.[899C > T] (p.Ser300Leu) variant was identified in two unrelated Swedish beta-ureidopropionase patients, indicating that beta-ureidopropionase deficiency may be more common than anticipated.
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| 7. |
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| 8. |
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| 9. |
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| 11. |
- Larochelle, Jean, et al.
(författare)
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Effect of nitisinone (NTBC) treatment on the clinical course of hepatorenal tyrosinemia in Québec.
- 2012
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Ingår i: Molecular genetics and metabolism. - : Elsevier BV. - 1096-7206 .- 1096-7192. ; 107:1-2, s. 49-54
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Tidskriftsartikel (refereegranskat)abstract
- Hepatorenal tyrosinemia (HT1, fumarylacetoacetate hydrolase deficiency, MIM 276700) can cause severe hepatic, renal and peripheral nerve damage. In Québec, HT1 is frequent and neonatal HT1 screening is practiced. Nitisinone (NTBC, Orfadin ®) inhibits tyrosine degradation prior to the formation of toxic metabolites like succinylacetone and has been offered to HT1 patients in Québec since 1994.
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| 12. |
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| 13. |
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| 14. |
- Möllsten, Anna, et al.
(författare)
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A polymorphism in the angiotensin II type 1 receptor gene has different effects on the risk of diabetic nephropathy in men and women.
- 2011
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier. - 1096-7192 .- 1096-7206. ; 103:1, s. 66-70
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Tidskriftsartikel (refereegranskat)abstract
- Background The etiology of diabetic nephropathy depends partly on genetic factors. Elevated systemic and intraglomerular blood pressure and glomerular filtration rate, partly regulated by the renin–angiotensin system, increase the risk of diabetic nephropathy. Methods The present case–control study investigated the association of the rs5186 polymorphism, in the angiotensin II type 1 receptor gene (AGTR1), with diabetic nephropathy. The study included 3561 patients with type 1 diabetes from Denmark, Finland, France and Sweden. Microalbuminuria was defined as albumin excretion rate (AER) ≥ 20 to < 200 μg/min or albumin concentration ≥ 30 to < 300 mg/l (n = 707), macroalbuminuria was defined as AER ≥ 200 μg/min or ≥ 300 mg/l (n = 1546), and patients with renal replacement therapy were also included in this group. The controls had > 15 years diabetes duration, AER < 20 μg/min or < 30 mg/l, and no antihypertensive treatment (n = 1308). Results AA genotype of the rs5186 polymorphism significantly increased the risk of diabetic nephropathy in male patients, OR = 1.27 (95% CI = 1.02–1.58), P = 0.03, adjusted for age at diabetes onset, HbA1c, diabetes duration, smoking and country of origin. Among the women, there were no significant associations between rs5186 and diabetic nephropathy, OR = 0.89 (0.71–1.11), P = 0.30. Conclusion We conclude that the AGTR1 gene may be associated with increased risk of diabetic nephropathy in men with type 1 diabetes.
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| 15. |
- Möllsten, Anna, et al.
(författare)
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The endothelial nitric oxide synthase gene and risk of diabetic nephropathy and development of cardiovascular disease in type 1 diabetes
- 2009
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192 .- 1096-7206. ; 97:1, s. 80-84
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Tidskriftsartikel (refereegranskat)abstract
- Nitric oxide (NO) is important in the maintenance of vascular tone and regulation of blood pressure. NO may also play a role in the development of both nephropathy and cardiovascular disease (CVD) in patients with diabetes. The susceptibility to nephropathy and CVD depends to some extent on genetic factors, therefore polymorphisms in the gene coding for endothelial NO-synthase, NOS3, can affect the risk of developing these diseases. Type 1 diabetes patients attending the Steno Diabetes Center, Denmark, between 1993 and 2001 were enrolled in this study. A total of 458 cases with diabetic nephropathy (albumin excretion >300 mg/24h) and 319 controls with persistent normoalbuminuria (<30 mg/24h), despite > or =20 years of diabetes duration at follow-up were identified. Patients were followed until death or end of the study. Associations between seven NOS3-gene polymorphisms and nephropathy, progression of nephropathy and CVD were studied. There was significant association between the rs743507 TT-genotype and diabetic nephropathy. When including age at diabetes onset, diabetes duration at follow-up, baseline Hb(A1c), sex and ever smoking in the analysis the OR was 1.43 (95% CI=1.03-2.00), P=0.035. In analyses of CVD development using Cox-regression the rs1799983 GG-genotype was a significant protective factor in normoalbuminuric patients, HR=0.32 (0.12-0.82), P=0.018, but not in patients with macroalbuminuria (covariates were; age at follow-up, baseline Hb(A1c), baseline systolic blood pressure, baseline cholesterol, sex and ever smoking). Our conclusion is that the NOS3-gene may be involved in the development of diabetic nephropathy in patients with type 1 diabetes and can be predictive of CVD during follow-up.
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| 16. |
- Nakajima, Yoko, et al.
(författare)
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Dihydropyrimidinase deficiency in four East Asian patients due to novel and rare DPYS mutations affecting protein structural integrity and catalytic activity
- 2017
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192 .- 1096-7206. ; 122:4, s. 216-222
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Tidskriftsartikel (refereegranskat)abstract
- Dihydropyrimidinase (DHP) is the second enzyme of the pyrimidine degradation pathway and catalyzes the ring opening of 5,6-dihydrouracil and 5,6-dihydrothymine. To date, only 31 genetically confirmed patients with a DHP deficiency have been reported and the clinical, biochemical and genetic spectrum of DHP deficient patients is, therefore, still largely unknown. Here, we show that 4 newly identified DHP deficient patients presented with strongly elevated levels of 5,6-dihydrouracil and 5,6-dihydrothymine in urine and a highly variable clinical presentation, ranging from asymptomatic to infantile spasm and reduced white matter and brain atrophy. Analysis of the DHP gene (DPYS) showed the presence of 8 variants including 4 novel/rare missense variants and one novel deletion. Functional analysis of recombinantly expressed DHP mutants carrying the p.M250I, p.H295R, p.Q334R, p.T418I and the p.R490H variant showed residual DHP activities of 2.0%, 9.8%, 9.7%, 64% and 0.3%, respectively. The crystal structure of human DHP indicated that all point mutations were likely to cause rearrangements of loops shaping the active site, primarily affecting substrate binding and stability of the enzyme. The observation that the identified mutations were more prevalent in East Asians and the Japanese population indicates that DHP deficiency may be more common than anticipated in these ethnic groups.
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| 17. |
- Palm, Fredrik
(författare)
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Commentary on Wilcken et al. Asymmetric Dimethylarginine (ADMA) in Vascular and Renal Disease
- 2007
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192 .- 1096-7206. ; 91:4, s. 308-
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Tidskriftsartikel (refereegranskat)abstract
- Wilcken and co-workers summarize our current knowledge about the role of asymmetric dimethylarginine (ADMA) as a key regulation of nitric oxide (NO) production, and examine the putative role of ADMA in the development of vascular and organ dysfunction [1]. Impaired NO production is closely associated with vascular dysfunction, especially during states of increased oxidative stress such as smoking, renal dysfunction requiring dialysis, hypertension and diabetes. Vallance et al. early identified increased ADMA levels in patients requiring dialysis, a state commonly associated with vascular dysfunction [2]. ADMA competitively inhibits NOS and competes with arginine for cellular uptake via the cationic amino acid-specific y+-system. Both mechanisms result in reduced NO production. ADMA levels are regulated by the interplay between the production by protein arginine methyltransferases (PRMTs), and the elimination by the metabolizing enzymes dimethylarginine dimethylaminohydrolase (DDAH) and, to a much lesser extent, by urinary excretion. However, as pointed out by the authors, numerous human studies have shown no beneficial effects of arginine supplementation, indicating a level of complexity for the regulation of ADMA levels that is not yet fully understood. The pioneering work by the authors themselves reveals a new mechanism that can explain some of these discrepancies. By showing that arginine directly inhibits DDAH in hepatic (HepG2) cells [3], they provide important information why arginine administration often fails to improve NO production. The knowledge about the cellular regulation of ADMA is constantly growing and will hopefully result in improved therapeutic strategies, especially for patients with vascular dysfunction due to impaired NO production.
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| 18. |
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| 19. |
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| 20. |
- van Kuilenburg, André B P, et al.
(författare)
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Clinical, biochemical and genetic findings in two siblings with a dihydropyrimidinase deficiency
- 2007
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192 .- 1096-7206. ; 91:2, s. 157-164
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Tidskriftsartikel (refereegranskat)abstract
- Dihydropyrimidinase (DHP) is the second enzyme of the pyrimidine degradation pathway and it catalyses the ring opening of 5,6-dihydrouracil and 5,6-dihydrothymine to N-carbamyl-beta-alanine and N-carbamyl-beta-aminoisobutyric acid, respectively. To date, only nine individuals have been reported suffering from a complete DHP deficiency. We report two siblings presenting with strongly elevated levels of 5,6-dihydrouracil and 5,6-dihydrothymine in plasma, cerebrospinal fluid and urine. One of the siblings had a severe delay in speech development and white matter abnormalities, whereas the other one was free of symptoms. Analysis of the DHP gene (DPYS) showed that both patients were compound heterozygous for the missense mutation 1078T>C (W360R) in exon 6 and a novel missense mutation 1235G>T (R412M) in exon 7. Heterologous expression of the mutant enzymes in Escherichia coli showed that both missense mutations resulted in a mutant DHP enzyme without residual activity. Analysis of the crystal structure of eukaryotic DHP from the yeast Saccharomyces kluyveri and the slime mold Dictyostelium discoideum suggests that the W360R and R412M mutations lead to structural instability of the enzyme which could potentially impair the assembly of the tetramer.
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| 21. |
- Wuolikainen, Anna, 1980-, et al.
(författare)
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ALS patients with mutations in the SOD1 gene have an unique metabolomic profile in the cerebrospinal fluid compared with ALS patients without mutations
- 2012
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier. - 1096-7192 .- 1096-7206. ; 105:3, s. 472-478
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Tidskriftsartikel (refereegranskat)abstract
- A specific biochemical marker for early diagnosing and for monitoring disease progression in amyotrophic lateral sclerosis (ALS) will have important clinical applications. ALS is a heterogeneous syndrome with multiple subtypes with ill-defined borders. A minority of patients carries mutations in the Cu/Zn-superoxide dismutase (SOD1) gene but the disease mechanism remains unknown for all types of ALS. Using a GC-TOFMS platform we studied the cerebrospinal fluid (CSF) metabolome in 16 ALS patients with six different mutations in the SOD1 gene and compared with ALS-patients without such mutations. OPLS-DA was used for classification modeling. We find that patients with a SOD1 mutation have a distinct metabolic profile in the CSF. In particular, the eight patients homozygous for the D90A SOD1 mutation showed a distinctively different signature when modeled against ALS patients with other SOD1 mutations and sporadic and familial ALS patients without a SOD1 gene mutation. This was found irrespective of medication with riluzole and survival time. Among the metabolites that contributed most to the CSF signature were arginine, lysine, ornithine, serine, threonine and pyroglutamic acid, all found to be reduced in patients carrying a D90A SOD1 mutation. ALS-patients with a SOD1 gene mutation appear as a distinct metabolic entity in the CSF, in particular in patients with the D90A mutation, the most frequently identified cause of ALS. The findings suggest that metabolomic profiling using GC-TOFMS and multivariate data analysis may be a future tool for diagnosing and monitoring disease progression, and may cast light on the disease mechanisms in ALS.
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| 22. |
- Yuan, Shuai, et al.
(författare)
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Assessing causal associations of obesity and diabetes with kidney stones using Mendelian randomization analysis
- 2021
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier. - 1096-7192 .- 1096-7206. ; 134:1-2, s. 212-215
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Tidskriftsartikel (refereegranskat)abstract
- Background: Obesity and type 2 diabetes have been associated with an increased risk of kidney stones in observational studies, but the causality of these associations remains unestablished. We conducted a Mendelian randomization study to determine these associations.Methods: Independent single nucleotide polymorphisms at the genome-wide significance threshold (p < 5 x 10(-)(8)) were selected as instrumental variables and were identified from meta-analyses of genome-wide association studies on body mass index (up to 806,834 individuals) and type 2 diabetes (228,499 cases and 1,178,783 non-cases). Summary-level data for the associations of exposure-associated SNPs with kidney stones were obtained from the UK Biobank study (3540 cases and 357,654 non-cases) and the FinnGen consortium (3856 cases and 172,757 non-cases). Causal estimates from two sources were combined using the meta-analysis method.Results: Higher genetically predicted body mass index and genetic liability to type 2 diabetes were associated with an increased risk of kidney stones in both the UK Biobank study and FinnGen consortium. In the meta-analysis of results from the two data sources, the odds ratios of kidney stones were 133 (95% confidence interval, 1.17, 151; p < 0.001) per one standard deviation increase in genetically predicted body mass index (similar to 4.8 kg/m(2)) and 1.15 (95% confidence interval, 1.10, 1.20; p < 0.001) for one unit increase in genetically predicted log-transformed odds of type 2 diabetes.Interpretation: This study based on genetic data suggests that a high body mass index and type 2 diabetes may be causal risk factors for kidney stone formation.
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| 23. |
- Bradlow, HL, et al.
(författare)
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Comparison of plasma and urinary levels of 2-hydroxyestrogen and 16 alpha-hydroxyestrogen metabolites
- 2006
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 87:2, s. 135-146
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Tidskriftsartikel (refereegranskat)abstract
- A modified ELISA assay for measurement of the two estrogen metabolites 2-hydroxyestrone (2OHE1) and 16 alpha-hydroxyestrone (16 alpha OHE1) in plasma and serum has been developed. Previously, these have only been measured in urine. It is not known how well the measurements of these metabolites in urine and plasma are correlated. The goal of this study was to compare urinary and plasma levels of 2OHE1 and 16 alpha OHE1 and their ratios and to explore how they were affected by ethnicity, dietary and genetic factors, and medication use. Blood and urine samples were obtained from 511 nulliparous women, aged 17-35, from four ethnic groups during the same visit at the study center, on a random day of the menstrual cycle. The overall correlation between the 2OHE1/16 alpha OHE1 ratio in plasma and urine was fair (r(s) = 0.52; p < 0.0001). In general, the correlation between the 2OHE1/16 alpha OHE1 ratio in urine and plasma was higher among women not using oral contraceptives (OCs) (r(s) = 0.58; p < 0.0001) than among women currently using OCs (r(s) = 0.34; p < 0.0001). The correlation was highest for samples obtained during the mid-cycle in among non-OC users (r(s) = 0.83; p < 0.0001). Among non-OC users, the urinary 2OHE1/160 alpha OHE1 ratio was stable over the menstrual cycle while there was an increase in the plasma 2OHE1/16 alpha OHE1 ratio. The strongest factors predicting discordance between the urinary and plasma 2OHE1/16 alpha OHE1 ratios among non-OC users were a baseline urinary 20HE1/16 alpha OHE1 ratio in the three upper quartiles (p < 0.001), the menstrual cycle phase (p = 0.001), and the number of cups of coffee consumed per day (p = 0.006). Among current OC users, the strongest predictors of discordance between the urinary and plasma 2OHE1/16 alpha OHE1 ratios were a baseline urinary 2IHE1/16 alpha OHE1 ratio in the three lower quartiles (p < 0.001), being black (p = 0.001), and being Asian (p = 0.014). In conclusion, we found that the correlation between the two methods was fair and varied according to the baseline urinary 2OHE1/16 alpha OHE1 ratio, ethnic group, OC status, coffee consumption, and time of menstrual cycle when the samples were obtained. (C) 2005 Elsevier Inc. All rights reserved.
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| 24. |
- Brorsson, Caroline, et al.
(författare)
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A non-synonymous variant in SLC30A8 is not associated with type 1 diabetes in the Danish population
- 2008
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 94:3, s. 386-388
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Tidskriftsartikel (refereegranskat)abstract
- Genome-wide association scans in type 2 diabetes (T2D) have identified a risk variant, rs13266634 (Arg325Trp), in SLC30A8 on chromosome 8. SLC30A8 encodes a beta-cell specific zinc-ion transporter and rs13266634 has been shown to affect insulin secretion. Recently, autoantibodies for Slc30A8 with high predictive value were demonstrated in individuals with type 1 diabetes (T1 D), making this gene an interesting T1 D candidate gene. We genotyped rs13266634 in 3008 cases and controls and 246 families from Denmark. Association to T1 D could not be demonstrated.
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| 25. |
- Desnick, Robert J., et al.
(författare)
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Roscoe Owen Brady, MD : Remembrances of co-investigators and colleagues
- 2017
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 120:1-2, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- To celebrate the research visions and accomplishments of the late Roscoe O. Brady (1923-2016), remembrance commentaries were requested from several of his postdoctoral research fellows and colleagues. These commentaries not only reflect on the accomplishments of Dr. Brady, but they also share some of the backstories and experiences working in the Brady laboratory. They provide insights and perspectives on Brady's research activities, and especially on his efforts to develop an effective treatment for patients with Type 1 Gaucher disease. These remembrances illuminate Brady's efforts to implement the latest scientific advances with an outstanding team of young co-investigators to develop and demonstrate the safety and effectiveness of the first enzyme replacement therapy for a lysosomal storage disease. Brady's pursuit and persistence in accomplishing his research objectives provide insights into this remarkably successful physician scientist who paved the way for the development of treatments for patients with other lysosomal storage diseases.
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| 26. |
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| 27. |
- Eklund, Erik A., et al.
(författare)
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Thrombosis risk with estrogen use for puberty induction in congenital disorders of glycosylation
- 2023
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 138:4
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Tidskriftsartikel (refereegranskat)abstract
- Congenital disorders of glycosylation are a group of rare related disorders causing multisystem dysfunction, including ovarian failure in females that requires early estrogen replacement. Glycosylation defects also disrupt normal synthesis of several coagulation factors, increasing thrombotic risks and complicating hormone replacement. This series describes four females with different types of CDG who developed venous thromboses while on transdermal estrogen replacement. The authors highlight the knowledge gaps around anticoagulation for this population and propose further investigations.
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| 28. |
- Elander, Johanna, et al.
(författare)
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Pathogenic mtDNA variants, in particular single large-scale mtDNA deletions, are strongly associated with post-lingual onset sensorineural hearing loss in primary mitochondrial disease
- 2022
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 137:3, s. 230-238
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Tidskriftsartikel (refereegranskat)abstract
- In this retrospective cohort study of 193 consecutive subjects with primary mitochondrial disease (PMD) seen at the Children's Hospital of Philadelphia Mitochondrial Medicine Frontier Program, we assessed prevalence, severity, and time of onset of sensorineural hearing loss (SNHL) for PMD cases with different genetic etiologies. Subjects were grouped by genetic diagnosis: mitochondrial DNA (mtDNA) pathogenic variants, single large-scale mtDNA deletions (SLSMD), or nuclear DNA (nDNA) pathogenic variants. SNHL was audiometrically confirmed in 27% of PMD subjects (20% in mtDNA pathogenic variants, 58% in SLSMD and 25% in nDNA pathogenic variants). SLSMD had the highest odds ratio for SNHL. SNHL onset was post-lingual in 79% of PMD cases, interestingly including all cases with mtDNA pathogenic variants and SLSMD, which was significantly different from PMD cases caused by nDNA pathogenic variants. SNHL onset during school age was predominant in this patient population. Regular audiologic assessment is important for PMD patients, and PMD of mtDNA etiology should be considered as a differential diagnosis in pediatric patients and young adults with post-lingual SNHL onset, particularly in the setting of multi-system clinical involvement. Pathogenic mtDNA variants and SLSMD are less likely etiologies in subjects with congenital, pre-lingual onset SNHL.
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| 29. |
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| 30. |
- Ghandil, P, et al.
(författare)
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Crohn's disease associated CARD15 (NOD2) variants are not involved in the susceptibility to type 1 diabetes
- 2005
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 86:3, s. 379-383
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Tidskriftsartikel (refereegranskat)abstract
- Three variants in the caspase recruitment domain 15/nucleotide-binding oligomerization domain 2 (CARD15/NOD2) gene have been shown to be associated with Crohn's disease (CD). There is a strong support for shared genetic determinants between various autoimmune and inflammatory diseases. In particular, linkage of type 1 diabetes (T1D) and other autoimmune and inflammatory diseases has been reported on chromosome 16, encompassing the region containing the CARD15 gene. We therefore considered this gene as a good candidate for the T1D locus mapped to this region, and we tested the three CARD15 variants in the susceptibility to T I D in two independent settings: family based association analysis in Scandinavian multiplex families that we previously showed to be linked to this region, and case/control association study in a large cohort of French diabetic patients. We found no evidence for association of these variants with T1D overall, nor in subgroups of patients with or without the major risk genotypes at HLA-DRB1, at insulin (INS), or positive or negative for autoantibodies specific to other autoimmune diseases. Our results do not support a role for CD-associated CARD15 variants in the susceptibility to T1D, and suggest that another gene is responsible for the shared susceptibility between autoimmune and inflammatory diseases mapping to this region.
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| 31. |
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| 32. |
- Hellerud, Christina, 1955, et al.
(författare)
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Clinical heterogeneity and molecular findings in five Polish patients with glycerol kinase deficiency: investigation of two splice site mutations with computerized splice junction analysis and Xp21 gene-specific mRNA analysis.
- 2003
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Ingår i: Molecular genetics and metabolism. - 1096-7192. ; 79:3, s. 149-59
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Tidskriftsartikel (refereegranskat)abstract
- Five cases of glycerol kinase deficiency are presented with clinical, biochemical, and genetic results. Two had the glycerol kinase deficiency as part of an Xp21 contiguous gene deletion syndrome-complex form-and three had an isolated form of the enzyme deficiency. In these we found two splice site mutations (IVS1+4A>G, IVS9-1G>T) and one insertion (1393_1394insG). In patients with the complex form, a deletion of the DAX1, GK genes and the distal part of the DMD gene was found. A computerized study was performed to predict the effects of the splice site mutations. It showed that the IVS9-1G>T mutation substantially altered and removed the wild-type site and enhanced a cryptic site seven nucleotides downstream, and that the IVS1+4A>G diminished the strength of the wild-type donor site from strong to leaky. To verify these predictions, we developed an RT-PCR system with gene-specific primers that exclusively amplifies the Xp21 glycerol kinase gene transcript. Identification of individuals at risk is motivated by a need to avoid delay in a correct diagnosis. For reliable identification of heterozygotes for isolated glycerol kinase deficiency, knowledge of the specific mutation in the proband is required. This is easily obtained with the RT-PCR analyses developed in this study.
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| 33. |
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| 34. |
- Hietala, Maria, et al.
(författare)
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Androgen receptor htSNPs in relation to androgen levels and OC use in young women from high-risk breast cancer families.
- 2011
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 102, s. 82-90
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Tidskriftsartikel (refereegranskat)abstract
- High testosterone levels have been associated with breast cancer. BRCA1 may function as an androgen receptor (AR) co-regulator. We aimed to examine AR haplotype-tagging single-nucleotide polymorphisms (AR htSNPs) and diplotypes in relation to in vivo androgen levels, combined OC use, CAG and GGC genotypes, and BRCA1/2/X family status in 269 young healthy women from breast cancer high-risk families and 56 additional BRCA1/2 mutation carriers. Testosterone, androstenedione, dehydroepiandrosterone sulfate, and body constitution were measured on cycle days 18-23. Six AR htSNPs and CAG and GGC repeat lengths were genotyped. Most OC users had lower androgen levels than non-users (all Ps<0.0001). Rare variant diplotypes were associated with higher testosterone levels in OC users than in non-users (P(interaction)=0.011). The interaction remained after adjustment for family clustering. Neither individual AR htSNPs nor other diplotypes were significantly associated with androgen levels and did not tag for CAG or GGC genotypes. In the first included woman from each family, the odds of having the most common diplotype was lower in BRCA1 families compared to other families OR 0.41 (95% CI 0.22-0.78). In conclusion, we found few associations between AR htSNPs or diplotypes and androgen levels in women. Diplotypes cannot replace genotyping of microsatellites CAG or GGC. Since testosterone levels are not affected the same way by combined OC use among all women, young women who have higher testosterone levels during combined OC use may belong to the subgroup of women who will not be helped by combined OCs for treatment of androgen-dependent conditions and may be at higher risk for early-onset breast cancer. Whether these women can be identified with AR genotyping needs to be confirmed in an independent cohort.
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| 35. |
- Jernström, Helena, et al.
(författare)
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Genetic factors related to racial variation in plasma levels of insulin-like growth factor-1: implications for premenopausal breast cancer risk
- 2001
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 72:2, s. 144-154
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Tidskriftsartikel (refereegranskat)abstract
- The oral contraceptive pill is associated with a modest increase in the risk of early-onset breast cancer in the general population, but it is possible that the risk is higher in certain subgroups of women. The relative risk of breast cancer associated with oral contraceptive use has been reported to be higher for African-American women than for white women. African-American women also have a higher incidence of premenopausal breast cancer than white women. Circulating levels of insulin-like growth factor-1 (IGF-I) vary between ethnic groups and are positively associated with the risk of premenopausal breast cancer. In general, the plasma level of IGF-I is lower in women who take oral contraceptives than in women who do not. In an attempt to explain the observed ethnic difference in IGF-I levels with oral contraceptive use, we sought to identify polymorphic variants of genes that are associated with IGF-I levels and estrogen metabolism. We measured IGF-I and IGFBP-3 plasma levels in 503 nulligravid women between the ages of 17 and 35. All women filled out a questionnaire that included information about ethnic background and oral contraceptive use. Samples of DNA were used to genotype the women for known polymorphic variants in the IGF1, AIB1, and CYP3A4 genes. Black women had significantly higher mean IGF-I levels than white women (330 ng/ml versus 284 ng/ml; P = 0.001, adjusted for age and oral contraceptive use). IGF-I levels were significantly suppressed by oral contraceptives in white women (301 ng/ml versus 267 ng/ml; P = 0.0003), but not in black women. Among oral contraceptive users, the IGF-I level was positively associated with the absence of the IGF1 19-repeat allele (338 ng/ml versus 265 ng/ml; P = 0.00007), with the presence of the CYP3A4 variant allele (320 ng/ml versus 269 ng/ml; P = 0.01), and with the presence of the AIB1 26-repeat allele (291 ng/ml versus 271; P = 0.08). After adjusting for genotypes, ethnic group was no longer a significant predictor of the IGF-I level. IGF-I levels are higher among black than white women. Polymorphic variants in the CYP3A4, IGF1, and AIB1 genes are associated with increases in the plasma levels of IGF-I among oral contraceptive users and the variant alleles are much more common in black women than in white women. The high incidence of premenopausal breast cancer among black women may be mediated through genetic modifiers of circulating levels of IGF-I.
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| 36. |
- Jernström, Helena, et al.
(författare)
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High follicular phase luteinizing hormone levels in young healthy BRCA1 mutation carriers: Implications for breast and ovarian cancer risk.
- 2005
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 86:1-2, s. 320-327
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Tidskriftsartikel (refereegranskat)abstract
- BRCA1 mutation carriers have up to 80% life-time risk of developing breast cancer and 20-40% risk of developing ovarian cancer. High LH levels have been linked to increased risks of both breast and ovarian cancers in some studies and it is unknown whether gonadotropin levels are associated with BRCA1 mutation status. The aim of the study was to explore whether gonadotropin levels were associated with BRCA1 mutation status among healthy <= 40-year-old-women from hereditary breast cancer families. All women completed a questionnaire including information on reproductive factors and OC use. We measured height, weight, breast volumes, and plasma levels of LH, FSH, and estradiol (E2) once during menstrual cycle days 5-10 and once again during cycle days 18-23 in 43 non-carriers from BRCA1 families, 20 BRCA1 mutation carriers, and 101 women from non-BRCA1/2 families. The strongest predictors of high LH levels among BRCA1 mutation carriers and non-carriers during cycle days 5-10 were being a BRCA1 mutation carrier (p = 0.002), lack of current OC use (p = 0.003), and being nulliparous (p = 0.01), adjusted for age and menstrual cycle day when the samples were obtained. This association was seen both in non-OC users and current OC users but was only significant in the former group (p = 0.005). Because of multiple analyses it is possible that our finding is a result of a Type 1 statistical error. After a permutation test the new adjusted p value in non-OC users was 0.05. FSH and E2 were similar in non-carriers, BRCA1 mutation carriers and women from non-BRCA1/2 families. We found significantly elevated LH levels in the follicular phase among young healthy BRCA1 mutation carriers compared with non-carriers from BRCA1 families. This is a small study and confirmatory studies are warranted to establish whether elevated LH levels are part of the BRCA1 phenotype and may be manipulated in order to reduce cancer risks in BRCA1 mutation carriers.
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| 37. |
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| 38. |
- Klug, T. L., et al.
(författare)
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Moderate coffee and alcohol consumption improves the estrogen metabolite profile in adjuvant treated breast cancer patients: A pilot study comparing pre- and post-operative levels
- 2006
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 89:4, s. 381-389
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Tidskriftsartikel (refereegranskat)abstract
- Most, but not all, studies have found that women with a high urinary 2-hydroxyestrogen (2OHE) to 16 alpha-hydroxyestrone (16 alpha OHE1) ratio are at reduced risk for breast cancer and have a better prognosis. The aim was to identify factors associated with the pre-operative 2OHE to 16 alpha OHE1 ratio and factors that predicted the change in the ratio between the pre-operative visit and first follow-up visit three to six months post-o.peratively among 59 women with primary ER positive breast cancer tumors. Body measurements, questionnaires and blood samples for measurements of the 2OHE and 16 alpha OHE1 plasma levels and CYP1A2*1F genotyping were collected at both visits. Post-operatively, 15 women received tamoxifen, 30 women tamoxifen and radiotherapy concomitantly, and 14 women radiotherapy. The pre-operative ratio was not correlated with tumor characteristics, but was significantly higher in women who consumed three or more cups of coffee daily (p = 0.009). The number of CYP1A2*1F Galleles was correlated with a lower ratio at both visits (p = 0.13 and p = 0.02, respectively). The ratio increased between the two visits in 69.5% of the women, The factors associated with a significant increase in the ratio were concomitant tamoxifen and radiotherapy (p = 0.006), increasing alcohol consumption (p = 0.006), and a high coffee consumption (p = 0.03), but not age or CYP1A2*1F genotype. In this pilot study, breast cancer patients who started tarnoxifen during radiotherapy and who had a moderate coffee and alcohol consumption demonstrated a significant improvement in their estrogen metabolite profile between the pre- and post-operative visits. (c) 2006 Elsevier Inc. All rights reserved.
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| 39. |
- Lai, Joe, et al.
(författare)
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CYP gene polymorphisms and early menarche
- 2001
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 74:4, s. 449-457
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Tidskriftsartikel (refereegranskat)abstract
- Early age at menarche is a risk factor for breast cancer. A previous study reported a significant positive association between the CYP3A4*1B variant allele and early puberty. We investigated whether polymorphisms of the CYP3A4, CYP17, CYP1B1, and CYP1A2 genes predict the age at onset of menarche. Five hundred eighty-three nulliparous women between ages 17 and 35, of various ethnic backgrounds, completed a questionnaire that included information about menstrual history. Samples of DNA were provided and used to genotype these women for polymorphic variants in the four genes. There was no significant difference in mean age at menarche between women who carried two variant CYP17 A2 alleles (12.5 years) and women who carried one or no variant allele (12.5 years) (P = 0.8, adjusted for ethnic group and year of birth). Similar results were found for the CYP1B1*3 variant allele and for the CYP1A2*1F variant allele. Women who carried two variant CYP3A4*1B alleles had an earlier mean age at menarche (12.0 years) than women who carried one or no variant allele (12.6 years) (P = 0.02). However, after adjusting for ethnic group and year of birth, no significant differences in mean age at menarche were found. The polymorphic variants of the CYP3A4, CYP17, CYP1B1, and CYP1A2 genes are unlikely to influence age of menarche.
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| 40. |
- McCormack, Shana E., et al.
(författare)
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Hospitalizations for mitochondrial disease across the lifespan in the U.S
- 2017
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 121:2, s. 119-126
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Tidskriftsartikel (refereegranskat)abstract
- Importance: Mitochondrial disease is being diagnosed with increasing frequency. Although children with mitochondrial disease often have severe, life-limiting illnesses, many survive into adulthood. There is, however, limited information about the impact of mitochondrial disease on healthcare utilization in the U.S. across the lifespan. Objectives: To describe the characteristics of inpatient hospitalizations related to mitochondrial disease in the U.S., to identify patient-level clinical factors associated with in-hospital mortality, and to estimate the burden of hospitalizations on individual patients. Design: Cross-sectional and longitudinal observational studies. Setting: U.S. hospitals. Participants: Individuals with hospital discharges included in the triennial Healthcare Cost and Utilization Project (HCUP) Kids Inpatient Database (KID) and the National Inpatient Sample (NIS) in 2012 (cross-sectional analysis); individuals with hospital discharges included in the HCUP California State Inpatient Database from 2007 to 2011, inclusive (longitudinal analysis). Exposure: Hospital discharge associated with a diagnosis of mitochondrial disease. Main outcome measures: Total number and rate of hospitalizations for individuals with mitochondrial disease (International Classification of Diseases, 9th revision, Clinical Modification code 277.87, disorder of mitochondrial metabolism); in-hospital mortality. Results: In the 2012, there were approximately 3200 inpatient pediatric hospitalizations (1.9 per 100,000 population) and 2000 inpatient adult hospitalizations (0.8 per 100,000 population) for mitochondrial disease in the U.S., with associated direct medical costs of $113. million. In-hospital mortality rates were 2.4% for children and 3.0% for adults, far exceeding population averages. Higher socioeconomic status was associated with both having a diagnosis of mitochondrial disease and with higher in-hospital mortality. From 2007 to 2011 in California, 495 individuals had at least one admission with a diagnosis of mitochondrial disease. Patients had a median of 1.1 hospitalizations (IQI, 0.6-2.2) per calendar year of follow-up; infants under 2y were hospitalized more frequently than other age groups. Over up to five years of follow up, 9.9% of participants with any hospitalization for mitochondrial disease were noted to have an in-hospital death. Conclusions and relevance: Hospitalizations for pediatric and adult mitochondrial diseases are associated with serious illnesses, substantial costs, and significant patient time. Identification of opportunities to prevent or shorten such hospitalizations should be the focus of future studies.
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| 41. |
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| 42. |
- Nilsson, Louise, 1975, et al.
(författare)
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A common variant near the PRL gene is associated with increased adiposity in males
- 2011
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 102:1, s. 78-81
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Tidskriftsartikel (refereegranskat)abstract
- A common variant (rs4712652) adjacent to the prolactin gene was recently associated with obesity using a genome-wide association study. The aim of this study was to replicate the association between rs4712652 and obesity and further examine if rs4712652 is associated with fat percentage and adiponectin levels in a population based Scandinavian cohort. rs4712652 was genotyped in 4879 participants (mean BMI 26.5 +/- 4.5 kg/m(2)) from the population-based PPP-Botnia Study and related to BMI, fat percentage and adiponectin levels. We found that the risk A allele of rs4712652 is associated with increased BMI and fat percentage in males (P=0.0047 and P=0.025, respectively), but not in females (P = 0.98, P=0.45). Male A allele carriers have a higher risk of being overweight with an OR of 1.16 (P=0.025). While there was a significant negative correlation between adiponectin levels and fat percentage (r = -036; P=0.039) in male carriers of the protective GG genotype, this correlation was lost in male carriers of the risk rs4712652 A allele (P=0.33). Thus, the common SNP rs4712652 near the PRL gene seems to affect body fat and adiposity in a sex-specific fashion. It remains to be shown whether this is mediated by different prolactin concentrations or differences in tissue sensitivity to prolactin. (C) 2010 Elsevier Inc. All rights reserved.
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| 43. |
- Olsson, Anders H, et al.
(författare)
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The expression of myosin heavy chain (MHC) genes in human skeletal muscle is related to metabolic characteristics involved in the pathogenesis of type 2 diabetes.
- 2011
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 103, s. 275-281
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Tidskriftsartikel (refereegranskat)abstract
- Type 2 diabetes patients exhibit a reduction in oxidative muscle fibres and an increase in glycolytic muscle fibres. In this study, we investigated whether both genetic and non-genetic factors influence the mRNA expression levels of three myosin heavy chain (MHC) genes represented in different fibre types. Specifically, we examined the MHC7 (slow-twitch oxidative fibre), MHCIIa (fast-twitch oxidative fibre) and MHCIIx/d (fast-twitch glycolytic fibre) genes in human skeletal muscle. We further investigated the use of MHC mRNA expression as a proxy to determine fibre-type composition, as measured by traditional ATP staining. Two cohorts of age-matched Swedish men were studied to determine the relationship of muscle mRNA expression of MHC7, MHCIIa, and MHCIIx/d with muscle fibre composition. A classical twin approach, including young and elderly Danish twin pairs, was utilised to examine if differences in expression levels were due to genetic or environmental factors. Although MHCIIx/d mRNA expression correlated positively with the level of type IIx/d muscle fibres in the two cohorts (P<0.05), a relatively low magnitude of correlation suggests that mRNA does not fully correlate with fibre-type composition. Heritability estimates and genetic analysis suggest that the levels of MHC7, MHCIIa and MHCIIx/d expression are primarily under non-genetic influence, and MHCIIa indicated an age-related decline. PGC-1α exhibited a positive relationship with the expression of all three MHC genes (P<0.05); meanwhile, PGC-1β related positively with MHCIIa expression and negatively with MHCIIx/d expression (P<0.05). While MHCIIa expression related positively with insulin-stimulated glucose uptake (P<0.01), MHCIIx/d expression related negatively with insulin-stimulated glucose uptake (P<0.05). Our findings suggest that the expression levels of the MHC genes are associated with age and both PGC-1α and PGC-1β and indicate that the MHC genes may to some extent be used to determine fibre-type composition in human skeletal muscle.
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| 44. |
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| 45. |
- Shah, Rameen, et al.
(författare)
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ALG13-Congenital Disorder of Glycosylation (ALG13-CDG) : Updated clinical and molecular review and clinical management guidelines
- 2024
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Ingår i: Molecular Genetics and Metabolism. - 1096-7192. ; 142:2
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Forskningsöversikt (refereegranskat)abstract
- ALG13-Congenital Disorder of Glycosylation (CDG), is a rare X-linked CDG caused by pathogenic variants in ALG13 (OMIM 300776) that affects the N-linked glycosylation pathway. Affected individuals present with a predominantly neurological manifestation during infancy. Epileptic spasms are a common presenting symptom of ALG13-CDG. Other common phenotypes include developmental delay, seizures, intellectual disability, microcephaly, and hypotonia. Current management of ALG13-CDG is targeted to address patients’ symptoms. To date, less than 100 individuals have been reported with ALG13-CDG. In this article, an international group of experts in CDG reviewed all reported individuals affected with ALG13-CDG and suggested diagnostic and management guidelines for ALG13-CDG. The guidelines are based on the best available data and expert opinion. Neurological symptoms dominate the phenotype of ALG13-CDG where epileptic spasm is confirmed to be the most common presenting symptom of ALG13-CDG in association with hypotonia and developmental delay. We propose that ACTH/prednisolone treatment should be trialed first, followed by vigabatrin, however ketogenic diet has been shown to have promising results in ALG13-CDG. In order to optimize medical management, we also suggest early cardiac, gastrointestinal, skeletal, and behavioral assessments in affected patients.
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| 46. |
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| 47. |
- Tsuchiya, Takafumi, et al.
(författare)
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Association of the calpain-10 gene with type 2 diabetes in Europeans: Results of pooled and meta-analyses
- 2006
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 89:1-2, s. 174-184
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Tidskriftsartikel (refereegranskat)abstract
- We conducted pooled and meta-analyses of the association of the calpain-10 gene (CAPN10) polymorphisms SNP-43, Indel-19 and SNP-63 individually and as haplotypes with type 2 diabetes (T2D) in 3237 patients and 2935 controls of European ancestry. In the pooled analyses, the common SNP-43*G allele was associated with modest but statistically significant increased risk of T2D (odds ratio (OR) = 1.11 (95% confidence interval (0), 1.02-1.20), P = 0.01). Two haplotype combinations were associated with increased risk of T2D) (1-2-1/1-2-1, OR = 1.20 (1.03-1.41), P = 0.02; and 1-1-2/1-2-1, OR = 1.26 (1.01-1.59), P = 0.04) and one with decreased risk (1-1-1/2-2-1, OR = 0.86 (0.75-0.99), P = 0.03). The meta-analysis also showed a significant effect of the 1-2-1/1-2-1 haplogenotype on risk (OR = 1.25 (1.05-1.50), P = 0.01). However, there was evidence for heterogeneity with respect to this effect (P = 0.06). The heterogeneity appeared to be due to data sets in which the cases were selected from samples used in linkage studies of T2D. Using only the population-based case-control samples removed the heterogeneity (P = 0.89) and strengthened the evidence for association with T2D) in both the pooled (SNP-43*G, OR = 1.19 (1.07-1.32), P = 0.001; 1-2-1/1-2-1 haplogenotype, OR = 1.46 (1.19-1.78), P = 0.0003; 1-1-2/1-2-1 haplogenotype, OR = 1.52 (1.12-2.06), P = 0.007; and 1-1-1/2-2-1 haplogenotype, OR = 0.83 (0.70-0.99), P = 0.03) and the meta-analysis (SNP-43*G, OR = 1.18 (1.05-1.32), P = 0.005; 1-2-1/1-2-1 haplogenotype, OR = 1.68 (1.33-2.11), P = 0.00001). The pooled and meta-analyses as well as the linkage disequilibrium and haplotype diversity studies suggest a role for genetic variation in CAPN10 affecting risk of T2D in Europeans. (c) 2006 Elsevier Inc. All rights reserved.
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| 48. |
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| 49. |
- Wraith, James E., et al.
(författare)
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Recommendations on the diagnosis and management of Niemann-Pick disease type C
- 2009
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Ingår i: Molecular Genetics and Metabolism. - : Elsevier BV. - 1096-7192. ; 98:1-2, s. 152-165
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Niemann-Pick disease type C (NP-C) is a lysosomal storage disease in which impaired intracellular lipid trafficking leads to excess storage of cholesterol and glycosphingolipids in the brain and other tissues. it is characterized clinically by a variety of progressive, disabling neurological symptoms including clumsiness, limb and gait ataxia, dysarthria, dysphagia and cognitive deterioration (dementia). Until recently, there has been no disease-modifying therapy available for NP-C, with treatment limited to supportive measures. In most countries, NP-C is managed through specialist centers, with non-specialist support provided locally. However, effective patient Support is hampered by the absence of national or international clinical management guidelines. In this paper, we seek to address this important gap in the Current literature. An expert panel Was convened in Paris, France in January 2009 to discuss best care practices for NP-C. This commentary reviews Current literature on key aspects of the clinical management of NP-C in children, juveniles and adults, and provides recommendations based on consensus between the experts at the meeting. (C) 2009 Elsevier Inc. All rights reserved.
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