title: A whole MEN1 gene deletion flanked by Alu repeats in a family with multiple endocrine neoplasia type 1.
abstract: Multiple endocrine neoplasia type 1 is an autosomal dominant cancer syndrome characterized by pituitary, parathyroid and enteropancreatic endocrine tumors, which is caused by germline mutations of the tumor suppressor gene MEN1. In the case reported here, the patient had family with this disease whose germline MEN1 mutation was undetectable by conventional sequencing analysis. Further investigations involving polymorphism analyses, gene dose assay and nucleotide sequencing identified a large germline deletion of approximately 29 kilobase pairs spanning the whole MEN1 gene. The deletion was flanked by Alu repetitive sequences, suggesting unequal homologous recombination as the deletion mechanism. The polymorphism linkage data suggested that an asymptomatic son of the proband did not carry the family mutation. More direct evidence was obtained by gene dose assay and deletion-specific polymerase chain reaction, which demonstrated the normal MEN1 gene dosage and the absence of the deletion breakpoints in this asymptomatic subject and thus definitely excluded the possibility of disease predisposition.
authors.affiliation: Department of Breast and Endocrine Surgery, Mitsui Memorial Hospital, Tokyo, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Fukuuchi
authors.forename: Yuko
authors.initials: Y
authors.lastname: Nagamura
authors.forename: Hiroko
authors.initials: H
authors.lastname: Yaguchi
authors.forename: Naganari
authors.initials: N
authors.lastname: Ohkura
authors.forename: Takao
authors.initials: T
authors.lastname: Obara
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Tsukada
mesh_terms: D020087:Alu Elements / Q000235:genetics*; D017353:Gene Deletion; D018628:Gene Dosage; D016147:Genes, Tumor Suppressor; D018095:Germ-Line Mutation; D006801:Humans; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged; D018761:Multiple Endocrine Neoplasia Type 1 / Q000235:genetics*; D010375:Pedigree; D011110:Polymorphism, Genetic