Germline mutations of EXO1 gene in patients with hereditary nonpolyposis colorectal cancer (HNPCC) and atypical HNPCC forms

Y Wu, MJW Berends, JG Post, RGJ Mensink, E Verlind, T Van Der Sluis, C Kempinga, RH Sijmons, AGJ Van der Zee, H Hollema, JH Kleibeuker, CHCM Buys, RMW Hofstra*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

(Background & Aims) under bar: Germline mutations in one of four mismatch repair genes have been found in the majority of families with hereditary nonpolyposis colorectal cancer (HNPCC), but only in a small part of families with atypical HNPCC. The recently cloned EXO1 gene might be involved in the pathogenesis of HNPCC because the EXO1 protein strongly interacts with the MSH2 protein. To determine its role in HNPCC, EXO1 was scanned for germline mutations, (Methods) under bar: All 14 exons of EXO1 were scanned for mutations in index patients from 33 families with HNPCC fulfilling the Amsterdam criteria and in 225 index patients suspected of HNPCC. (Results) under bar: Germline variants of EXO1 were detected in 14 patients, including one splice-site mutation in a family with HNPCC and 13 missense mutations in patients with atypical HNPCC, These variants did not occur in more than 200 control individuals. From 13 of these 14 patients, tumors were available for analysis of microsatellite instability and loss of heterozygosity, Six of the tumors showed microsatellite instability. Heterozygosity analysis showed one case without EXO1 allelic loss and 12 tumors with loss of the mutant allele and retention of the normal one. (Conclusions) under bar: The results indicate a possible association of germline EXO1 variants with HNPCC and atypical HNPCC.

Original languageEnglish
Pages (from-to)1580-1587
Number of pages8
JournalGastroenterology
Volume120
Issue number7
Publication statusPublished - Jun-2001

Keywords

  • INTERNATIONAL-COLLABORATIVE-GROUP
  • SACCHAROMYCES-CEREVISIAE EXO1
  • MISMATCH REPAIR
  • MICROSATELLITE INSTABILITY
  • EXONUCLEASE-I
  • COLON-CANCER
  • ICG-HNPCC
  • DNA
  • IDENTIFICATION
  • RECOMBINATION

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