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Multiple Roles of APC and its Therapeutic Implications in Colorectal Cancer
1Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA.
Abstract:
Adenomatous polyposis coli (APC) is widely accepted as a tumor suppressor gene highly mutated in colorectal cancers (CRC). Mutation and inactivation of this gene is a key and early event almost uniquely observed in colorectal tumorigenesis. Alterations in the APC gene generate truncated gene products, leading to activation of the Wnt signaling pathway and deregulation of multiple other cellular processes. It has been a mystery why most patients with CRC retain a truncated APC protein, but accumulating evidence suggest that these C terminally truncated APC proteins may have gain of function properties beyond the well-established loss of tumor suppressive function. Here, we will review the evidence for both the loss of function and the gain of function of APC truncations and how together they contribute to CRC initiation and progression.
Insights
Adenomatous polyposis coli (APC) gene mutations are key in colorectal cancer (CRC) development. Reviewing evidence shows truncated APC proteins contribute to CRC through both loss of tumor suppression and gain of function.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Adenomatous polyposis coli (APC) is a critical tumor suppressor gene frequently mutated in colorectal cancer (CRC).
- APC gene mutations are early events in colorectal tumorigenesis, leading to truncated APC proteins.
- These alterations activate the Wnt signaling pathway and disrupt cellular processes.
Purpose of the Study:
- To review evidence for both loss-of-function and gain-of-function properties of APC truncations.
- To elucidate how these dual functions contribute to colorectal cancer initiation and progression.
Main Methods:
- Literature review of studies investigating APC gene mutations in colorectal cancer.
- Analysis of experimental evidence supporting loss and gain of function mechanisms.
- Synthesis of findings on the role of APC truncations in tumorigenesis.
Main Results:
- Accumulating evidence suggests C-terminally truncated APC proteins possess gain-of-function properties.
- These gain-of-function activities extend beyond the established loss of tumor suppressive function.
- Both loss and gain of function mechanisms of APC truncations are implicated in CRC.
Conclusions:
- Truncated APC proteins play a dual role in colorectal cancer development.
- Understanding both loss and gain of function is crucial for comprehending CRC initiation and progression.
- Further research into APC truncation mechanisms may reveal novel therapeutic targets for CRC.