Identification of a Novel Intracellular Function of the Secreted Ribonuclease RNASE1 in Inhibiting Gene Expression

Area of Science:

• Molecular Biology
• Cancer Research
• Gene Regulation

Background:

• Extracellular ribonuclease RNASE1 typically degrades RNA.
• Its intracellular functions, particularly in cancer, remain largely uncharacterized.

Purpose of the Study:

• To investigate the nuclear localization and function of RNASE1 in human colorectal cancer (CRC).
• To determine the role of RNASE1 in CRC cell proliferation and gene expression.

Main Methods:

• CRISPR interference (CRISPRi) for RNASE1 depletion.
• RNA sequencing (RNA-seq) to analyze gene expression changes.
• Analysis of patient data to correlate RNASE1 expression with survival.

Main Results:

• RNASE1 is predominantly localized to the nucleus in CRC cells, where it inhibits gene expression.
• Depletion of RNASE1 leads to upregulation of target genes, including DKK1, and increased CRC cell proliferation.
• Downregulation of RNASE1 in CRC patients is associated with poorer survival.

Conclusions:

• Endogenous RNASE1 functions as a nuclear-localized gene expression inhibitor in CRC.
• RNASE1 exhibits tumor suppressive properties by inhibiting CRC cell growth.
• Targeting RNASE1 or its regulatory pathways may offer therapeutic strategies for colorectal cancer.