Human Molecular Genetics, Vol 6, 2285-2290, Copyright © 1997 by Oxford University Press
LV Debelenko, E Brambilla, SK Agarwal, JI Swalwell, MB Kester, IA Lubensky, Z Zhuang, SC Guru, P Manickam, SE Olufemi, SC Chandrasekharappa, JS Crabtree, YS Kim, C Heppner, AL Burns, AM Spiegel, SJ Marx, LA Liotta, FS Collins, WD Travis and MR Emmert-Buck
Lung carcinoids occur sporadically and rarely in association with multiple
endocrine neoplasia type 1 (MEN1). There are no well defined genetic
abnormalities known to occur in these tumors. We studied 11 sporadic lung
carcinoids for loss of heterozygosity (LOH) at the locus of the MEN1 gene
on chromosome 11q13, and for mutations of the MEN1 gene using dideoxy
fingerprinting. Additionally, a lung carcinoid from a MEN1 patient was
studied. In four of 11 (36%) sporadic tumors, both copies of the MEN1 gene
were inactivated. All four tumors showed the presence of a MEN1 gene
mutation and loss of the other allele. Observed mutations included a 1 bp
insertion, a 1 bp deletion, a 13 bp deletion and a single nucleotide
substitution affecting a donor splice site. Each mutation predicts
truncation or potentially complete loss of menin. The remaining seven
tumors showed neither the presence of a MEN1 gene mutation nor 11q13 LOH.
The tumor from the MEN1 patient showed LOH at chromosome 11q13 and a
complex germline MEN1 gene mutation. The data implicate the MEN1 gene in
the pathogenesis of sporadic lung carcinoids, representing the first
defined genetic alteration in these tumors.
ARTICLES
Identification of MEN1 gene mutations in sporadic carcinoid tumors of the lung
Laboratory of Pathology, National Cancer Institute, NIH, Bethesda, MD 20892, USA.
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