Cancer-associated snaR-A noncoding RNA interacts with core splicing machinery and disrupts processing of mRNA...

Area of Science:

• Oncology
• Molecular Biology
• RNA Biology

Background:

• RNA polymerase III (Pol III) activity produces small noncoding RNAs (ncRNAs) in cancer, promoting tumor growth.
• snaR-A (small NF90-associated RNA isoform A) is a hominid-specific ncRNA linked to cancer progression but remains poorly understood.
• Pol III overactivity and its products like snaR-A are implicated in tumorigenesis.

Purpose of the Study:

• To investigate the biogenesis and protein interactions of snaR-A.
• To elucidate the role of snaR-A in cancer progression.
• To understand the molecular mechanisms by which snaR-A influences cellular processes.

Main Methods:

• Genomic and biochemical approaches were used to study snaR-A.
• Chromatin landscapes were profiled across various primary tumor types.
• Interactions between snaR-A and mRNA splicing factors, including SF3B2, were analyzed.

Main Results:

• Predicted snaR-A upregulation is linked to unfavorable outcomes in cancer patients.
• snaR-A interacts with mRNA splicing factors, notably SF3B2 (a U2 snRNP component).
• snaR-A depletion reduces intron retention in U2 snRNP-occupied mRNAs, affecting genes with high GC content and specific functional enrichments.

Conclusions:

• snaR-A plays a significant role in cancer progression by interacting with splicing machinery.
• Dysregulation of snaR-A contributes to widespread splicing defects, altering the cellular proteome.
• This study establishes a novel mechanism linking Pol III overactivity to tumorigenesis via snaR-A-mediated splicing misregulation.