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1.
  • Weuve, Jennifer, et al. (författare)
  • Guidelines for reporting methodological challenges and evaluating potential bias in dementia research.
  • 2015
  • Ingår i: Alzheimer's & dementia : the journal of the Alzheimer's Association. - 1552-5279. ; 11:9, s. 1098-109
  • Tidskriftsartikel (refereegranskat)abstract
    • Clinical and population research on dementia and related neurologic conditions, including Alzheimer's disease, faces several unique methodological challenges. Progress to identify preventive and therapeutic strategies rests on valid and rigorous analytic approaches, but the research literature reflects little consensus on "best practices." We present findings from a large scientific working group on research methods for clinical and population studies of dementia, which identified five categories of methodological challenges as follows: (1) attrition/sample selection, including selective survival; (2) measurement, including uncertainty in diagnostic criteria, measurement error in neuropsychological assessments, and practice or retest effects; (3) specification of longitudinal models when participants are followed for months, years, or even decades; (4) time-varying measurements; and (5) high-dimensional data. We explain why each challenge is important in dementia research and how it could compromise the translation of research findings into effective prevention or care strategies. We advance a checklist of potential sources of bias that should be routinely addressed when reporting dementia research.
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2.
  • Grisoni, Marie-Lise, et al. (författare)
  • Haplotypic analysis of tag SNPs of the interleukin-18 gene in relation to cardiovascular disease events : the MORGAM Project.
  • 2008
  • Ingår i: European Journal of Human Genetics. - 1018-4813 .- 1476-5438. ; 16:12, s. 1512-20
  • Tidskriftsartikel (refereegranskat)abstract
    • Interleukin-18 (IL-18) is a key inflammatory molecule suspected of being involved in the etiology of cardiovascular diseases (CVD). Five single nucleotide polymorphisms (SNPs) capturing the common genetic variation of the IL-18 gene (tag SNPs) were genotyped in five European prospective CVD cohorts including 1933 cases and 1938 non-cases as part of the MORGAM Project. Not a single SNP was found associated with CVD. However, a significant (P=0.002) gene-smoking interaction was observed. In smokers, the -105T allele was more frequent in cases than in non-cases (0.29 vs 0.25) and associated with an increased risk of disease (odds ratio (OR)=1.25 (1.07-1.45), P=0.005), whereas the inverse relationship tended to be observed in non-smokers (OR=0.90 (0.78-1.02), P=0.131). The gene-smoking interaction was broadly homogenous across the cohorts and was also observed through haplotype analyses. In conclusion, using the concerted effort of several European prospective CVD cohorts, we are able to show that one IL-18 tag SNP interacts with smoking to modulate the risk of developing CVD.
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3.
  • Grisoni, Marie-Lise, et al. (författare)
  • Lack of association between polymorphisms of the IL18R1 and IL18RAP genes and cardiovascular risk : the MORGAM Project.
  • 2009
  • Ingår i: BMC Medical Genetics. - 1471-2350 .- 1471-2350. ; 10, s. 44-
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Interleukin-18 is a pro-inflammatory cytokine suspected to be associated with atherosclerosis and its complications. We had previously shown that one single nucleotide polymorphism (SNP) of the IL18 gene was associated with cardiovascular disease (CVD) through an interaction with smoking. As a further step for elucidating the contribution of the IL-18 pathway to the etiology of CVD, we here investigated the association between the genetic variability of two IL-18 receptor genes, IL18R1 and IL18RAP, with the risk of developing CVD. METHODS: Eleven tagging SNPs, 5 in IL18R1 and 6 in IL18RAP, characterizing the haplotypic variability of the corresponding genes; were genotyped in 5 European prospective CVD cohorts including 1416 cases and 1772 non-cases, as part of the MORGAM project. Both single-locus and haplotypes analyses were carried out to investigate the association of these SNPs with CVD. RESULTS: We did not find any significant differences in allele, genotype and haplotype frequencies between cases and non-cases for either of the two genes. Moreover, the search for interactions between SNPs located in different genes, including 5 IL18 SNPs previously studied in the MORGAM project, and between SNPs and environmental factors remained unfruitful. CONCLUSION: Our analysis suggests that the variability of IL18R1 and IL18RAP genes are unlikely to contribute to modulate the risk of CVD.
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4.
  • Villard, Eric, et al. (författare)
  • A genome-wide association study identifies two loci associated with heart failure due to dilated cardiomyopathy
  • 2011
  • Ingår i: European Heart Journal. - 0195-668X .- 1522-9645. ; 32:9, s. 1065-1076
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims: Dilated cardiomyopathy (DCM) is a major cause of heart failure with a high familial recurrence risk. So far, the genetics of DCM remains largely unresolved. We conducted the first genome-wide association study (GWAS) to identify loci contributing to sporadic DCM.Methods and results: One thousand one hundred and seventy-nine DCM patients and 1108 controls contributed to the discovery phase. Pools of DNA stratified on disease status, population, age, and gender were constituted and used for testing association of DCM with 517 382 single nucleotide polymorphisms (SNPs). Three DCM-associated SNPs were confirmed by individual genotyping (P < 5.0 10−7), and two of them, rs10927875 and rs2234962, were replicated in independent samples (1165 DCM patients and 1302 controls), with P-values of 0.002 and 0.009, respectively. rs10927875 maps to a region on chromosome 1p36.13 which encompasses several genes among which HSPB7 has been formerly suggested to be implicated in DCM. The second identified locus involves rs2234962, a non-synonymous SNP (c.T757C, p. C151R) located within the sequence of BAG3 on chromosome 10q26. To assess whether coding mutations of BAG3 might cause monogenic forms of the disease, we sequenced BAG3 exons in 168 independent index cases diagnosed with familial DCM and identified four truncating and two missense mutations. Each mutation was heterozygous, present in all genotyped relatives affected by the disease and absent in a control group of 347 healthy individuals, strongly suggesting that these mutations are causing the disease.Conclusion: This GWAS identified two loci involved in sporadic DCM, one of them probably implicates BAG3. Our results show that rare mutations in BAG3 contribute to monogenic forms of the disease, while common variant(s) in the same gene are implicated in sporadic DCM.
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5.
  • Wild, Philipp S., et al. (författare)
  • A Genome-Wide Association Study Identifies LIPA as a Susceptibility Gene for Coronary Artery Disease
  • 2011
  • Ingår i: Circulation: Cardiovascular Genetics. - : American Heart Association. - 1942-325X .- 1942-3268. ; 4:4, s. 203-403
  • Tidskriftsartikel (refereegranskat)abstract
    • Background-eQTL analyses are important to improve the understanding of genetic association results. We performed a genome-wide association and global gene expression study to identify functionally relevant variants affecting the risk of coronary artery disease (CAD). Methods and Results-In a genome-wide association analysis of 2078 CAD cases and 2953 control subjects, we identified 950 single-nucleotide polymorphisms (SNPs) that were associated with CAD at P<10(-3). Subsequent in silico and wet-laboratory replication stages and a final meta-analysis of 21 428 CAD cases and 38 361 control subjects revealed a novel association signal at chromosome 10q23.31 within the LIPA (lysosomal acid lipase A) gene (P=3.7 x 10(-8); odds ratio, 1.1; 95% confidence interval, 1.07 to 1.14). The association of this locus with global gene expression was assessed by genome-wide expression analyses in the monocyte transcriptome of 1494 individuals. The results showed a strong association of this locus with expression of the LIPA transcript (P=1.3 x 10(-96)). An assessment of LIPA SNPs and transcript with cardiovascular phenotypes revealed an association of LIPA transcript levels with impaired endothelial function (P=4.4 x 10(-3)). Conclusions-The use of data on genetic variants and the addition of data on global monocytic gene expression led to the identification of the novel functional CAD susceptibility locus LIPA, located on chromosome 10q23.31. The respective eSNPs associated with CAD strongly affect LIPA gene expression level, which was related to endothelial dysfunction, a precursor of CAD. (Circ Cardiovasc Genet. 2011;4:403-412.)
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