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RAD-6: pyrimidine synthesis and radiation sensitivity in Caenorhabditis elegans.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The Caenorhabditis elegans rad-6 mutant, identified over 25 years ago, exhibits enhanced sensitivity to DNA damaging agents.
  • rad-6 is essential for DNA repair and has implications for aging and metabolism.

Purpose of the Study:

  • To identify the molecular basis of the rad-6 gene.
  • To investigate the function of rad-6 in DNA repair, metabolism, and lifespan.
  • To understand the compensatory mechanisms in rad-6 mutants.

Main Methods:

  • Molecular identification of the rad-6 gene.
  • Biochemical assays to determine enzyme activities.
  • Phenotypic analysis of rad-6 mutants, including UV-C sensitivity, metabolic rate, and lifespan measurements.
  • Assessment of pyrimidine salvage pathway dependency.

Main Results:

  • The rad-6 gene encodes the bifunctional UMP synthase, containing OPRTase and ODCase activities essential for de novo pyrimidine synthesis.
  • rad-6 mutants display UV-C hypersensitivity, decreased metabolic rate, and reduced lifespan.
  • Mutants adapt to the loss of de novo pyrimidine synthesis by relying on pyrimidine salvage.
  • rad-6 mutants are resistant to 5-FOA, indicating a lack of ODCase activity.

Conclusions:

  • rad-6 is crucial for DNA repair, metabolism, and lifespan in C. elegans.
  • Loss of rad-6 function disrupts pyrimidine synthesis, leading to significant physiological defects.
  • A maternal effect on a metabolic sensor influencing survival and metabolism was identified, dependent on the rad-6 genotype.