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Genetic regulation of unsaturated fatty acid composition in C. elegans.


Delta-9 desaturases, also known as stearoyl-CoA desaturases, are lipogenic enzymes responsible for the generation of vital components of membranes and energy storage molecules. We have identified a novel nuclear hormone receptor, NHR-80, that regulates delta-9 desaturase gene expression in Caenorhabditis elegans. Here we describe fatty acid compositions, lifespans, and gene expression studies of strains carrying mutations in nhr-80 and in the three genes encoding delta-9 desaturases, fat-5, fat-6, and fat-7. The delta-9 desaturase single mutants display only subtle changes in fatty acid composition and no other visible phenotypes, yet the fat-5;fat-6;fat-7 triple mutant is lethal, revealing that endogenous production of monounsaturated fatty acids is essential for survival. In the absence of FAT-6 or FAT-7, the expression of the remaining desaturases increases, and this ability to compensate depends on NHR-80. We conclude that, like mammals, C. elegans requires adequate synthesis of unsaturated fatty acids and maintains complex regulation of the delta-9 desaturases to achieve optimal fatty acid composition.

Pubmed ID: 16839188


  • Brock TJ
  • Browse J
  • Watts JL


PLoS genetics

Publication Data

July 14, 2006

Associated Grants

  • Agency: NIDDK NIH HHS, Id: R01 DK074114
  • Agency: NIDDK NIH HHS, Id: R01 DK074114-01
  • Agency: NIDDK NIH HHS, Id: R01-DK074114

Mesh Terms

  • Animals
  • Caenorhabditis elegans
  • Fatty Acids, Unsaturated
  • Gene Expression Regulation
  • Green Fluorescent Proteins
  • Mutation
  • Stearoyl-CoA Desaturase
  • Substrate Specificity