RBM5, 6, and 10 differentially regulate NUMB alternative splicing to control cancer cell proliferation

Area of Science:

• Molecular Biology
• Cancer Genetics
• RNA Splicing

Background:

• RNA-binding proteins RBM5, RBM6, and RBM10 are frequently altered in lung cancer.
• These proteins regulate alternative splicing of apoptotic genes.
• Their specific roles in cancer cell proliferation remain incompletely understood.

Purpose of the Study:

• To investigate the antagonistic roles of RBM5/6 and RBM10 in cancer cell proliferation.
• To identify key targets regulated by these RNA-binding proteins.
• To elucidate the mechanism by which RBM10 mutations promote lung cancer growth.

Main Methods:

• Analysis of alternative splicing regulation by RBM proteins.
• Identification of target genes using functional assays.
• Investigation of NUMB splicing alterations in lung cancer cells.
• Assessment of colony and xenograft tumor formation.

Main Results:

• RBM5/6 and RBM10 antagonistically control cancer cell proliferation.
• NUMB, a Notch pathway regulator, is a key target gene.
• Altered NUMB alternative splicing affects tumor formation.
• RBM10 mutations in lung cancer disrupt NUMB splicing, promoting cell growth.

Conclusions:

• RBM5, RBM6, and RBM10 play critical, opposing roles in regulating cancer cell proliferation.
• The NUMB splicing regulatory circuit is a key target in lung cancer.
• RBM10 mutations contribute to lung cancer progression via NUMB dysregulation.