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PCAT-1, a long noncoding RNA, regulates BRCA2 and controls homologous recombination in cancer

John R Prensner1, Wei Chen, Matthew K Iyer

  • 1Authors' Affiliations: Michigan Center for Translational Pathology; Departments of Pathology, Radiation Oncology, Internal Medicine, Pharmacology, and Urology; Comprehensive Cancer Center; Howard Hughes Medical Institute, University of Michigan Medical School, Ann Arbor, Michigan; Department of Genitourinary Medical Oncology, MD Anderson Cancer Center, Houston, Texas; Department of Urology, Institute of Prostate Cancer and LeFrak Center For Robotic Surgery; Department of Pathology and Laboratory Medicine, Weill Cornell Medical College and New York Presbyterian Hospitals, New York, New York; Departments of Cancer Biology, Urology, and Radiation Oncology, Thomas Jefferson University, Philadelphia, Pennsylvania; and Centre for Integrative Biology, University of Trento, Trento, Italy.

Cancer Research
|January 30, 2014
PubMed

Insights

A novel long noncoding RNA, PCAT-1, impairs double-stranded DNA break repair in sporadic prostate cancer by repressing BRCA2. This leads to increased sensitivity to PARP1 inhibitors, offering new therapeutic strategies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Impaired DNA repair is crucial in cancer development.
  • Mechanisms of impaired double-stranded DNA break (DSB) repair in sporadic cancers are not fully understood.
  • Long noncoding RNAs (lncRNAs) are increasingly recognized for their roles in cancer.

Purpose of the Study:

  • To investigate the role of lncRNAs in DSB repair in prostate cancer.
  • To identify novel mechanisms of impaired DSB repair in sporadic prostate cancers.
  • To explore the therapeutic potential of targeting lncRNA-mediated repair defects.

Main Methods:

  • Identification and characterization of PCAT-1, a prostate cancer outlier lncRNA.
  • Analysis of PCAT-1's effect on homologous recombination and DSB repair.
  • Investigation of PCAT-1's mechanism of action, including its interaction with BRCA2.
  • Assessment of sensitivity to PARP1 inhibitors in the context of PCAT-1 expression.

Main Results:

  • PCAT-1 was identified as a key regulator of cellular response to genotoxic stress in prostate cancer.
  • PCAT-1 expression leads to a functional deficiency in homologous recombination by repressing the BRCA2 tumor suppressor.
  • This repression occurs via posttranscriptional regulation of the BRCA2 3' untranslated region (3'UTR).
  • PCAT-1 expression confers sensitivity to small-molecule inhibitors of PARP1.

Conclusions:

  • PCAT-1 represents a novel mechanism of impaired DSB repair in sporadic prostate cancer.
  • PCAT-1 contributes to a state of "BRCAness" in sporadic cancers.
  • Targeting PCAT-1 or its downstream effects may offer new therapeutic avenues for prostate cancer patients.

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