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| 2. |
- Lindholm, E, et al.
(författare)
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Linkage analysis of a Swedish kindred provides further support for a susceptibility locus for schizophrenia on chromosome 6p23
- 1999
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Ingår i: American Journal of Medical Genetics. - 0148-7299 .- 1096-8628. ; 88:4, s. 369-377
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Tidskriftsartikel (refereegranskat)abstract
- Several reports have indicated genetic linkage between markers on the short arm of chromosome 6 and schizophrenia. However, significant threshold levels were not always achieved, and the chromosomal regions identified are large and different in different families. One way to decrease the problem of heterogeneity is to study a single extended pedigree. Here we report the analysis of a very large, previously undescribed pedigree from northern Sweden that includes 31 affected individuals. We typed 16 markers spanning 40 cM on the short arm of chromosome 6. Linkage analysis was performed only with the affected individuals. Suggestive lod scores (maximum 2.6) were obtained with markers on chromosome 6p23 in a single branch of the large pedigree indicating possible heterogeneity inside the family. A haplotype comprising markers from D6S309 to D6S1578 was found to segregate with the disease. This chromosomal region is included within a segment proposed to contain a susceptibility gene for schizophrenia by many other investigators. Our results thus give further support for a possible localization of a susceptibility locus for schizophrenia in 6p23 and help to narrow the candidate chromosomal region to the segment included between markers D6S309 and D6S1578. Copyright 1999 Wiley-Liss, Inc.
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| 3. |
- Akerblom, H.K., et al.
(författare)
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Environmental factors in the etiology of type 1 diabetes
- 2002
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Ingår i: American Journal of Medical Genetics. - Hoboken, NJ, United States : John Wiley & Sons. - 0148-7299 .- 1096-8628. ; 115:1, s. 18-29
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Forskningsöversikt (refereegranskat)abstract
- Type 1 diabetes is considered to be an autoimmune disease in which T lymphocytes infiltrate the islets of pancreas and destroy the insulin producing beta cell population. Besides antigen specificity, the quality of immune reactivity against islet cell antigen(s) is an important determinant of the beta cell destruction. Much evidence indicates that the function of the gut immune system is central in the pathogenesis, as the regulation of the gut immune system may be aberrant in type 1 diabetes. The role of virus infections in the pathogenesis of type 1 diabetes has been supported by substantial new evidence suggesting that one virus group, enteroviruses, may trigger the beta-cell damaging process in a considerable proportion of patients. The latest evidence comes from studies indicating the presence of viral genome in diabetic patients and from prospective studies confirming epidemiological risk effect. If this association holds still true in ongoing large-scale studies, intervention trials should be considered to confirm causality. Of the dietary putative etiological factors, cow's milk proteins have received the main attention. Many studies indicate an association between early exposure to dietary cow's milk proteins and an increased risk of type 1 diabetes. The question will be answered by a large scale, prospective, randomized, international intervention trial Another dietary factor in need of more studies is the deficiency of vitamin D. Among toxins, N-nitroso compounds are the main candidates. An interaction of genetic and environmental factors is important in evaluating the possible role of a certain environmental factor in the etiology of type 1 diabetes. © 2002 Wiley-Liss, Inc.
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| 6. |
- Boström, Katrin, et al.
(författare)
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Living with a hereditary disease : persons with muscular dystrophy and their next of kin.
- 2005
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Ingår i: American Journal of Medical Genetics. - Hoboken, N.J. : Wiley-Liss. - 0148-7299 .- 1096-8628 .- 1552-4825 .- 1552-4833. ; 136A:1, s. 17-24
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Tidskriftsartikel (refereegranskat)abstract
- This qualitative study describes conceptions and experiences of the hereditary aspect of muscular dystrophy (MD) from both the patients' and the next of kin's perspective. Different diagnoses of MD are included: dystrophia myotonica, myopathia distalis tarda hereditaria, Becker MD, facioscapulohumeral MD, limb-girdle MD, Emery-Dreifuss and undetermined proximal MD (Duchenne MD is not included). Interviews were conducted with 46 persons with MD and 36 next of kin. The interviews were subjected to inductive content analysis. Only two in each group did not spontaneously mention anything related to the fact that MD is disease with dominant or recessive inheritance. It was found that heredity has a prominent place in the thoughts and feelings of the family. These thoughts were classified as Becoming aware of MD and its hereditary nature, looking into the pedigree, acquiring an understanding of MD, thoughts about genetic testing, interpreting the risk, whether to have children or not, feelings related to the future, and feelings of responsibility and guilt. Families with MD need medical information and the opportunity for genetic testing as well as support and counseling in coming to terms with living with a hereditary disease, whether or not that includes a decision to take a test.
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| 7. |
- Castensson, Anja, et al.
(författare)
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Serotonin Receptor 2C (HTR2C) and Schizophrenia : Examination of Possible Medication and Genetic Influences on Expression Levels
- 2005
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Ingår i: American Journal of Medical Genetics. - : Wiley. - 0148-7299 .- 1096-8628. ; 134B, s. 84-89
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Tidskriftsartikel (refereegranskat)abstract
- The serotonin receptor 2C (HTR2C) gene is of interest in schizophrenia due to its involvement in regulation of dopamine activity in the prefrontal cortex. We have previously reported a decreased expression of HTR2C mRNA levels in the prefrontal cortex of schizophrenia patients. The variability in mRNA expression levels is evaluated here more closely in relation to promoter haplotypes and neuroleptic treatment received by the patients. The decrease in HTR2C mRNA was present in neuroleptic treated individuals and in patients untreated at death, indicating that the lower expression is not a short-term medication effect. Three promoter polymorphisms were used to construct haplotypes. No SNP displayed genotypic or haplotypic association with the disease. Gene expression of HTR2C was not affected by haplotype and the expression decrease in schizophrenia patients was similar in all haplotype combinations (diplotypes). We conclude that the decrease in HTR2C expression in schizophrenia may be related to the disease mechanism rather than to drug treatment. The disease related changes in HTR2C expression are not related to the promoter variants typed in our sample, but could be due to other regulatory variants or trans-acting factors.
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| 9. |
- Entesarian, Miriam, et al.
(författare)
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A chromosome 10 variant with a 12 Mb inversion [inv(10)(q11.22q21.1)] identical by descent in the Swedish population
- 2009
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Ingår i: American Journal of Medical Genetics. - : Wiley Interscience. - 0148-7299 .- 1096-8628 .- 1552-4825 .- 1552-4833. ; 149A:3, s. 380-386
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Tidskriftsartikel (refereegranskat)abstract
- We identified a paracentric inversion of chromosome 10 [inv(10)(q11.22q21.1)] in 0.20% of Swedish individuals (15/7,439) referred for cytogenetic analysis. A retrospective analysis of 8,896 karyotypes from amniocenteses in Sweden revealed a carrier frequency of 0.079% (7/8,896) for the inversion. Cloning and detailed analysis of the inversion breakpoint regions show enrichment for interspersed repeat elements and AT-stretches. The centromeric breakpoint coincides with that of a predicted inversion from HapMap data, which suggests that this region is involved in several chromosome 10 variants. No known gene or predicted transcript are disrupted by the inversion which spans approximately 12 Mb. Carriers from four non-related Swedish families have identical inversion breakpoints and haplotype analysis confirmed that the rearrangement is identical by descent. Diagnosis was retrieved in 6 out of the 15 carriers referred for cytogenetic analysis. No consistent phenotype was found to be associated with the inversion. Our study demonstrates that the inv(10)(q11.22q21.1) is a rare and inherited chromosome variant with a broad geographical distribution in Sweden.
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