TTPAL Promotes Colorectal Tumorigenesis by Stabilizing TRIP6 to Activate Wnt/β-Catenin Signaling

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Copy number alterations are key drivers in colorectal cancer development.
• Tocopherol alpha transfer protein-like (TTPAL) is identified as a gene frequently amplified in colorectal cancer.

Purpose of the Study:

• To investigate the role of TTPAL amplification and overexpression in colorectal cancer pathogenesis.
• To elucidate the molecular mechanisms by which TTPAL promotes colorectal tumorigenesis.

Main Methods:

• Whole-genome analysis to identify amplified genes.
• Gene expression and survival analysis in Chinese and TCGA cohorts.
• In vitro and in vivo functional assays to assess TTPAL's oncogenic roles.
• Coimmunoprecipitation followed by mass spectrometry to identify downstream effectors.

Main Results:

• Frequent copy number gain of TTPAL leads to its overexpression in colorectal cancer.
• TTPAL overexpression correlates with shortened patient survival.
• TTPAL promotes cell proliferation, migration, invasion, and metastasis by activating Wnt/β-catenin signaling via TRIP6 stabilization.
• TTPAL binds TRIP6, inhibiting its degradation and leading to β-catenin nuclear translocation.

Conclusions:

• TTPAL is commonly overexpressed in colorectal cancer due to copy number gain.
• TTPAL promotes colorectal tumorigenesis by stabilizing TRIP6 and activating Wnt/β-catenin signaling.
• TTPAL overexpression is a potential independent biomarker for colorectal cancer prognosis.