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PRDM5 is silenced in human cancers and has growth suppressive activities

Qingdong Deng1, Shi Huang

  • 1The Burnham Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA.

Oncogene
|April 13, 2004
PubMed

Insights

Researchers identified a new gene, PRDM5, involved in cancer. Silenced in several cancers, its expression induced cell cycle arrest and apoptosis, suggesting PRDM5 acts as a tumor suppressor.

Area of Science:

  • Genetics and Molecular Biology
  • Cancer Research
  • Human Genetics

Background:

  • The PR (PRDI-BF1 and RIZ) domain is present in genes associated with human cancers.
  • Tumor suppressor genes are often located on chromosome 4q26, a region implicated in various cancers.

Purpose of the Study:

  • To identify and characterize a novel PR-domain-containing gene, PRDM5.
  • To investigate the role of PRDM5 in human cancers, particularly its potential tumor suppressor function.

Main Methods:

  • Isolation of PRDM5 cDNA based on homology to RIZ1 (PRDM2).
  • Analysis of PRDM5 gene structure, including its open reading frame and zinc finger motifs.
  • Radiation hybrid mapping to determine PRDM5 chromosomal location.
  • Investigation of PRDM5 promoter methylation and gene silencing in cancer cell lines.
  • Functional studies using recombinant adenovirus to express PRDM5 in tumor cells.

Main Results:

  • PRDM5 encodes a 630-amino acid protein with an N-terminal PR domain and 16 zinc finger motifs.
  • PRDM5 was mapped to human chromosome 4q26.
  • PRDM5 exhibits a CpG island promoter and is silenced in breast, ovarian, and liver cancer cells.
  • Expression of PRDM5 via adenovirus induced G2/M cell cycle arrest and apoptosis in tumor cells.

Conclusions:

  • PRDM5 is a novel PR-domain-containing gene potentially functioning as a tumor suppressor.
  • Inactivation or silencing of PRDM5 may contribute to the development of various human cancers.
  • PRDM5 warrants further investigation for its role in carcinogenesis and potential therapeutic applications.

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