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Synthetic lethal genetic interactions that decrease somatic cell proliferation in Caenorhabditis elegans identify the

Jessica McLellan1, Nigel O'Neil, Sanja Tarailo

  • 1Department of Medical Genetics, The University of British Columbia, Vancouver, BC, Canada.

Molecular Biology of the Cell
|October 23, 2009
PubMed

Insights

Scientists identified conserved synthetic lethal interactions between cancer-related genes in yeast and worms. This discovery highlights potential new therapeutic targets for cancer treatment by exploiting vulnerabilities in chromosome instability (CIN) pathways.

Area of Science:

  • Genetics
  • Cancer Biology
  • Developmental Biology

Background:

  • Somatic mutations causing chromosome instability (CIN) are common in tumors.
  • Exploiting synthetic lethality (SL) offers a strategy for selective cancer cell killing.
  • Conserved genetic interactions in model organisms can identify new therapeutic targets.

Purpose of the Study:

  • To identify and validate SL interactions between CIN genes in Saccharomyces cerevisiae.
  • To develop and utilize a Caenorhabditis elegans assay for testing conserved SL interactions in somatic cells.
  • To identify potential chemotherapeutic targets for colon cancer.

Main Methods:

  • Statistical validation of SL interactions in S. cerevisiae.
  • Postembryonic RNA interference in C. elegans to induce gene knockdown.
  • Analysis of vulval cell lineage in C. elegans to assess somatic cell proliferation defects.
  • Comparative analysis of genetic interactions between S. cerevisiae and C. elegans.

Main Results:

  • Validated SL interactions between six S. cerevisiae CIN genes and five additional CIN genes.
  • Identified conserved SL interactions in C. elegans between cohesin complex members and CTF4, RAD27, and alternative RFC(CTF18) complex components.
  • Demonstrated that alternative RFC components (DCC1, CTF8, CTF18) are potential therapeutic targets due to mild phenotypes upon single knockdown in C. elegans.

Conclusions:

  • Conserved SL interactions between CIN genes in yeast and worms provide a basis for identifying new cancer therapies.
  • The C. elegans assay system is effective for discovering genetic interactions in multicellular animals and identifying therapeutic targets.
  • Alternative RFC components represent promising targets for cancer chemotherapy due to conserved SL interactions.

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