Loss of imprinting and overexpression of IGF2 gene in gastric adenocarcinoma.

Abstract:

:Both insulin-like growth factor II (IGF2) and H19 gene are located on chromosome 11p15.5 in close vicinity to each other, and are imprinted on different parental alleles. Although the exact mechanism remains unclear, loss of imprinting (LOI) leading to the biallelic expression of IGF2 and H19 genes has recently been reported in a variety of tumors. To study the role of IGF2 and H19 genes in gastric carcinogenesis, the LOI and loss of heterozygosity (LOH) status of these two genes were determined in 70 patients with gastric cancer. Among them, 30 patients were heterozygous for IGF2, 28 patients were heterozygous for H19, and 42 patients were heterozygous for either IGF2 or H19 gene. Among the 30 patients who were heterozygous for IGF2, one exhibited LOH (1/30, 3.3%) and 10 exhibited LOI (10/29, 34.5%). None of the 28 patients heterozygous for H19 gene had either LOH or LOI. LOI of IGF2 was more frequently found in the diffuse type (8/15, 53.3%) than the intestinal type (2/14, 14.3%, P < 0.05) gastric cancer. Five out of the six tumors with LOI of IGF2 exhibited overexpression of mRNA, but no obvious alterations of expression of H19 were noted by Northern hybridization. These data suggest that LOI leading to overexpression of IGF2 plays an important role in carcinogenesis of diffuse type gastric cancer.

journal_name

Cancer Lett

journal_title

Cancer letters

authors

Wu MS,Wang HP,Lin CC,Sheu JC,Shun CT,Lee WJ,Lin JT

doi

10.1016/s0304-3835(97)00279-6

subject

Has Abstract

pub_date

1997-11-25 00:00:00

pages

9-14

issue

1

eissn

0304-3835

issn

1872-7980

pii

S0304-3835(97)00279-6

journal_volume

120

pub_type

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