F-box and WD repeat domain-containing 7 regulates intestinal cell lineage commitment and is a haploinsufficient tumor suppressor

Gastroenterology
Rocio SanchoAxel Behrens

Abstract

The E3 ubiquitin ligase F-box and WD repeat domain-containing 7 (Fbw7) degrades several proto-oncogenes including c-Myc, cyclinE, Notch1, and c-Jun. Fbw7 is the fourth most frequently mutated gene in human colorectal carcinomas and has recently been described as a poor prognosis marker in human colorectal carcinoma; however, the molecular mechanism underlying fbw7 mutations in intestinal tumor suppression is unclear. To address the role of fbw7 in intestinal homeostasis and tumorigenesis, we generated conditional knock-out mice lacking fbw7 in the intestine and evaluated the effect of fbw7 absence in normal intestinal homeostasis and in adenomatous polyposis coli-mediated tumorigenesis. In parallel, we analyzed a cohort of human tumors bearing mutations in fbw7. Fbw7 was found to be highly expressed in the transit-amplifying progenitor cell compartment, and its deletion resulted in impaired goblet cell differentiation and accumulation of highly proliferating progenitor cells. This function of Fbw7 was mirrored during tumor formation because absence of Fbw7 increased proliferation and decreased differentiation of tumors triggered by aberrant Wnt signalling. Fbw7 exhibited haploinsufficiency for intestinal tumor suppression. Bial...Continue Reading

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