Abstract：
:Genetic-environmental interactions probably underlie spontaneous human autoimmune disorders, a category of complex traits thought to include multiple sclerosis (MS). The geographical distribution and familial aggregation of this disease have often been ascribed to the role of infectious agents, but there is no consensus. Increased family risks range from 300-fold for monozygotic twins to 20-40-fold for biological first-degree relatives over the general population prevalence of 0.1% (ref. 6). We screened a population-based sample of 15,000 individuals with MS by using standardized, personally administered questionnaires to identify adopted index cases and/or those who had adopted relatives. The frequency of MS among first-degree non-biological relatives living with the index case was no greater than expected from Canadian population prevalence data and significantly less than for biological relatives. These findings indicate that familial aggregation of MS is genetically determined: no effect of shared environment was detectable.
journal_name
Naturejournal_title
Natureauthors
Ebers GC,Sadovnick AD,Risch NJdoi
10.1038/377150a0subject
Has Abstractpub_date
1995-09-14 00:00:00pages
150-1issue
6545eissn
0028-0836issn
1476-4687journal_volume
377pub_type
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