BACKGROUND and AIMS: We previously demonstrated that the 2 APC mutations in human colorectal tumors are coselected, because tumorigenesis requires an optimal level of Wnt signaling. We and others subsequently showed that the truncated APC proteins in colorectal tumors usually retain a total of 1-2 beta-catenin binding/degradation repeats (20AARs); very few intestinal tumors have proteins with no 20AARs. The coselection of the "2 hits" at APC makes it difficult to undertake further mechanisti...Expand abstract
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The Apc 1322T mouse develops severe polyposis associated with submaximal nuclear beta-catenin expression.
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