Lack of frameshift mutations at coding mononucleotide repeats in hepatocellular carcinoma in Japanese patients.

Abstract:

BACKGROUND:Microsatellite instability occurs frequently in hereditary nonpolyposis colorectal carcinoma, in sporadic gastrointestinal carcinoma, and in other tumors. In these tumors, slippage-related frameshift mutations have been detected at coding mononucleotide repeats in genes such as those for transforming growth factor-beta receptor type II (TGFbetaRII), mannose 6-phosphate/insulinlike growth factor II receptor (M6P/IGFIIR), hMSH3, hMSH6, and Bcl-2-associated X protein (BAX). Because these genes regulate cell growth or repair DNA mismatches, loss of their function is thought to promote tumor development. The authors screened for these frameshift mutations and investigated the incidence of microsatellite instability (MI) in hepatocellular carcinoma (HCC) in Japan. METHODS:Fifty HCC samples were analyzed in this study. The authors used polymerase chain reactions to screen for frameshift mutation at the TGFbetaRII (A)(10) tract, the M6P/IGFIIR (G)(8) tract, the hMSH3 (A)(8) tract, the hMSH6 (C)(8) tract, and the BAX (G)(8) tract. For MI analysis, matched tumor and nontumor liver DNA were investigated with respect to 10 microsatellite loci. RESULTS:No frameshift mutation was detected in any case, and only 4% of these cancers exhibited MI in comparisons between tumor and nontumor liver specimens. CONCLUSIONS:This study suggests that frameshift mutation at coding mononucleotide repeats within TGFbetaRII, M6P/IGFIIR, hMSH3, hMSH6, and BAX genes did not seem to be involved in hepatocarcinogenesis in the Japanese population studied.

journal_name

Cancer

journal_title

Cancer

authors

Saeki A,Tamura S,Ito N,Kiso S,Matsuda Y,Yabuuchi I,Kawata S,Matsuzawa Y

subject

Has Abstract

pub_date

2000-03-01 00:00:00

pages

1025-9

issue

5

eissn

0008-543X

issn

1097-0142

pii

10.1002/(SICI)1097-0142(20000301)88:5<1025::AID-CN

journal_volume

88

pub_type

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