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[Cancer Research 59, 1857-1860, April 1, 1999]
© 1999 American Association for Cancer Research
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[Cancer Research 59, 1857-1860, April 15, 1999]
© 1999 American Association for Cancer Research

Biochemistry

Dominant Negative Effect of the APC1309 Mutation

A Possible Explanation for Genotype-Phenotype Correlations in Familial Adenomatous Polyposis1

Susanne Dihlmann, Johannes Gebert, Anja Siermann, Christian Herfarth and Magnus von Knebel Doeberitz2

Division for Molecular Diagnostics and Therapy, Department of Surgery, University of Heidelberg, D-69120 Heidelberg, Germany

Inactivation of the adenomatous polyposis coli (APC) gene product initiates colorectal tumorigenesis. Patients with familial APC (FAP) carry germ-line mutations in the APC gene and develop multiple colorectal adenomas and subsequent carcinomas early in life. The severity of the disease correlates with the position of the inherited APC mutation (genotype-phenotype correlation). Together with the fact that both germ-line and sporadic APC mutations cluster in the central region of the APC gene, this points to a dominant negative effect of certain APC mutants. Loss of APC function was recently shown to result in enhanced ß-catenin-/Tcf-mediated transcription in colon epithelial cells. Here, we provide experimental evidence for a dominant negative effect of APC gene products associated with severe polyposis. Wild-type APC activity in ß-catenin-/Tcf-mediated transcription was strongly inhibited by a mutant APC that is truncated at codon 1309. In contrast, mutant APC gene products that are associated with attenuated polyposis (codon 386 or 1465) interfered only weakly with wild-type APC activity. These results suggest a molecular explanation for the genotype-phenotype correlation in FAP patients and support the idea that colorectal tumor growth might be, in part, driven by selection for a mutation in the mutation cluster region




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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cancer Prevention Research
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Annual Meeting Education Book Meeting Abstracts Online
Copyright © 1999 by the American Association for Cancer Research.