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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dyment, D. A. Sadovnick, A. D. Ebers, G. C. Willer, C. J. Risch, N. J. |
| Spatial Coverage | Canada |
| Description | Author Affiliation: Willer CJ ( Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, United Kingdom.); |
| Abstract | Size and ascertainment constraints often limit twin studies to concordance comparisons between identical and fraternal twins. Here we report the final results of a longitudinal, population-based study of twins with multiple sclerosis (MS) in Canada. Bias was demonstrably minimized, and an estimated 75% of all Canadian MS twin pairs were ascertained, giving a sample sufficiently large (n = 370) to permit additional informative comparisons. Twinning was not found to affect prevalence, and twins with MS did not differ from nontwins for DR15 allele frequency nor for MS risk to their siblings. Probandwise concordance rates of 25.3% (SE +/- 4.4) for monozygotic (MZ), 5.4% (+/-2.8) for dizygotic (DZ), and 2.9% (+/-0.6) for their nontwin siblings were found. MZ twin concordance was in excess of DZ twin concordance. The excess concordance in MZ was derived primarily from like-sexed female pairs with a probandwise concordance rate of 34 of 100 (34 +/- 5.7%) compared with 3 of 79 (3.8 +/- 2.8%) for female DZ pairs. We did not demonstrate an MZ/DZ difference in males, although the sample size was small. We observed a 2-fold increase in risk to DZ twins over nontwin siblings of twins, but the difference was not significant. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 22 |
| Volume Number | 100 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2003-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Diseases In Twins Genetics Multiple Sclerosis Canada Epidemiology Databases, Factual Genetic Predisposition To Disease Heterozygote Homozygote Physiopathology Recurrence Registries Statistics & Numerical Data Twins, Dizygotic Twins, Monozygotic Research Support, Non-U.S. Gov't Twin Study Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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