Genetic Screening in Hereditary Multiple Endocrine Neoplasia Type 1: Absence of a Founder Effect among Japanese Families

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<jats:p>Ten Japanese families with hereditary multiple endocrine neoplasia type 1 (MEN1) were examined. Five DNA polymorphic markers on the long arm of chromosome 11 were analyzed for genetic screening of MEN1 in members of affected families, and disease carriers were identified before clinical manifestations. Unlike MEN1 families in Newfoundland or in Tasmania, no consistent haplotypes were segregated with the disease in the Japanese families when defined by 5 nearby markers. The identification of asymptomatic disease carriers is of substantial clinical importance for early management, genetic counseling and to avoid unnecessary screening for non‐disease carriers. However, genetic screening of family members by polymorphic markers could be useful only to each family, and no generally applicable markers were found for Japanese subjects with MEN1.</jats:p>

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