A Prostate Cancer Risk Element Functions as a Repressive Loop that Regulates HOXA13

Area of Science:

• Genomics
• Cancer Biology
• Molecular Genetics

Background:

• Prostate cancer (PCa) is a leading cancer in men, with significant genetic contributions to susceptibility.
• Noncoding genetic regions play crucial roles in gene regulation and disease risk.

Purpose of the Study:

• To investigate the functional role of a prostate cancer risk region at 7p15.2.
• To understand how this noncoding region influences gene regulation and contributes to PCa risk.

Main Methods:

• Hi-C analysis to identify long-range interactions.
• CRISPR/Cas9 gene editing to delete a 4-kb risk region.
• RNA-sequencing (RNA-seq) to assess transcriptomic changes.

Main Results:

• The 7p15.2 risk region interacts with the HOXA locus.
• Deletion of the risk element altered the expression of HOXA13 and HOTTIP.
• A repressive loop mechanism was implicated in regulating HOXA gene expression.

Conclusions:

• A specific noncoding element at 7p15.2 regulates HOXA13 and HOTTIP expression.
• This regulatory mechanism contributes to prostate cancer risk.