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A family of MEN1 with a novel germline missense mutation and benign polymorphisms.
Endocrine Journal 1998 December
The gene responsible for multiple endocrine neoplasia type 1 (MEN1) has recently been cloned, and its germline mutations were identified in patients with this syndrome. The majority of the mutations, frameshift or nonsense mutations, are expected to result in a loss of function of the gene product menin. Since the consequence of less common missense or in-frame deletion mutations is not clear, careful judgment is necessary regarding the role(s) of such mutations in MEN1 disease. Here we describe a large multigenerational MEN1 family with a novel germline missense mutation and three benign polymorphisms. The proband was a man with hyperparathyroidism and thymic carcinoid. We performed biochemical studies and DNA analyses of the MEN1 gene simultaneously and independently as family screening studies. Seven patients including the proband were identified, and all of them carried a heterozygous germline missense mutation E45G, but 5 members with normal biochemical results did not. This mutation was not observed in 50 normal volunteers. This novel missense mutation is therefore almost conclusively responsible for the disease. Although all of the mutant gene carriers in the present study already had clinical diseases, an MEN1 gene analysis in younger individuals at risk would be very useful in identifying carriers before the onset of the symptoms.
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