Multiple sclerosis in twins from continental Italy and Sardinia: a nationwide study.

Abstract:

:Knowledge about the balance between heritable and nonheritable risk in multiple sclerosis (MS) is based on twin studies in high-prevalence areas. In a study that avoided ascertainment limitations and directly compared continental Italy (medium-prevalence) and Sardinia (high-prevalence), we ascertained 216 pairs from 34,549 patients. This gives a twinning rate of 0.62% among MS patients, significantly less than that of the general population. In continental Italy, probandwise concordance was 14.5% (95% confidence interval, 5.1-23.8) for monozygotic and 4.0% (95% confidence interval, 0.8-7.1) for dizygotic twins. Results in Sardinia resemble those in northern populations but in limited numbers. Monozygotic concordance was 22.2% (95% confidence interval, 0-49.3) probandwise, but no concordant dizygotic pairs were identified. A questionnaire on 80 items possibly related to disease cause was administered to 70 twin pairs, 135 sporadic patients, and 135 healthy volunteers. Variables positively (7) or negatively (2) associated with predisposition and concordance in twins largely overlapped and were mainly linked to infection. If compared with previous studies, our data demonstrate that penetrance in twins appears to correlate with MS prevalence. They highlight the relevance of nonheritable variables in Mediterranean areas. The apparent underrepresentation of MS among Italian twins draws attention to protective factors, shared by twins, that may influence susceptibility.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Ristori G,Cannoni S,Stazi MA,Vanacore N,Cotichini R,Alfò M,Pugliatti M,Sotgiu S,Solaro C,Bomprezzi R,Di Giovanni S,Figà Talamanca L,Nisticò L,Fagnani C,Neale MC,Cascino I,Giorgi G,Battaglia MA,Buttinelli C,Tosi R,

doi

10.1002/ana.20683

keywords:

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

27-34

issue

1

eissn

0364-5134

issn

1531-8249

journal_volume

59

pub_type

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