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Genome-wide discovery of loci influencing chemotherapy cytotoxicity

James W Watters1, Aldi Kraja, Melissa A Meucci

  • 1Department of Medicine, Siteman Cancer Center, Washington University School of Medicine, 660 South Euclid Avenue, Campus Box 8069, St. Louis, MO 63110, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 30, 2004
PubMed

Insights

Chemotherapy response is heritable, with specific genes influencing cytotoxicity to 5-fluorouracil and docetaxel. This study used familial genetics to identify genomic regions linked to these chemotherapy responses, paving the way for personalized cancer treatments.

Area of Science:

  • Genetics
  • Pharmacology
  • Oncology

Background:

  • Chemotherapy individualization requires understanding genetic influences on drug response.
  • Current pharmacogenetics rely on pre-selected candidate genes, limiting discovery.
  • Familial genetics offers a novel approach to identify genetic determinants of chemotherapy efficacy.

Purpose of the Study:

  • To discover genetic factors influencing chemotherapy cytotoxicity using a familial genetics strategy.
  • To identify specific genomic regions associated with cellular responses to 5-fluorouracil and docetaxel.
  • To establish a method for pharmacogenomic discovery without prior gene selection.

Main Methods:

  • Utilized lymphoblastoid cells from Centre d'Etude du Polymorphisme Humain reference pedigrees for ex vivo analysis.
  • Performed genome-wide linkage analysis to map quantitative trait loci for chemotherapy response.
  • Assessed cytotoxicity and apoptosis induction by 5-fluorouracil and docetaxel.

Main Results:

  • Cytotoxicity to 5-fluorouracil and docetaxel demonstrated significant heritability (0.26-0.70).
  • Genome-wide linkage analysis identified quantitative trait loci on chromosomes 9q13-q22 for 5-fluorouracil and 5q11-21/9q13-q22 for docetaxel.
  • Both agents induced apoptotic cell death via caspase-3 cleavage in tested cells.

Conclusions:

  • Chemotherapy cytotoxicity is a heritable trait influenced by genetic factors.
  • Identified specific chromosomal regions harboring genes critical for 5-fluorouracil and docetaxel response.
  • The familial genetics strategy enables broad pharmacogenomic discovery for personalized cancer therapy.

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