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Sporadic follicular thyroid tumors show loss of a 200‐kb region in 11q13 without evidence for mutations in the MEN1 gene
Author(s) -
Nord Brita,
Larsson Catharina,
Wong Fung Ki,
Wallin Göran,
Teh Bin Tean,
Zedenius Jan
Publication year - 1999
Publication title -
genes, chromosomes and cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.754
H-Index - 119
eISSN - 1098-2264
pISSN - 1045-2257
DOI - 10.1002/(sici)1098-2264(199909)26:1<35::aid-gcc5>3.0.co;2-l
Subject(s) - men1 , loss of heterozygosity , carcinogenesis , tumor suppressor gene , multiple endocrine neoplasia , cancer research , biology , thyroid , exon , pax8 , adenoma , pathology , gene , medicine , genetics , allele , transcription factor
Loss of heterozygosity (LOH) in 11q13 where the tumor suppressor gene for multiple endocrine neoplasia type 1 (MEN 1) is located has been demonstrated in several tumor types, including follicular thyroid tumors, but whether the MEN1 gene is actually involved in their tumorigenesis is not known. In the present study, the involvement of the MEN1 gene in follicular thyroid tumors was investigated. By using 14 MEN1 ‐linked microsatellite markers, LOH was demonstrated in 12 out of 60 follicular thyroid tumors: 2/18 adenomas, 4/15 atypical adenomas, 1/6 Hürthle cell adenomas, 1/9 carcinomas, 3/6 Hürthle cell carcinomas, and 1/6 anaplastic carcinomas. In the tumors with LOH, a single minimal region of overlapping deletions was mapped to the 200‐kb interval between D11S4946 and D11S4939 . Tumors that showed 11q13 LOH were screened for mutations of the MEN1 gene using single‐strand conformation analysis. Abnormal shifts detected in seven tumors in two exons were sequenced, which revealed two different polymorphisms present in both tumor and constitutional DNA, but without somatic mutation. Taken together, these results suggest that in this region, a tumor suppressor gene other than MEN1 might be involved in the tumorigenesis of follicular thyroid tumors. Genes Chromosomes Cancer 26:35–39, 1999. © 1999 Wiley‐Liss, Inc.