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Collagen mutations in C. elegans affect mitochondrial DNA and nuclear DNA copy numbers. However, mitochondrial function is comparable between mutant and wild-type worms when normalized for developmental stage.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Collagen mutations are frequently utilized in creating Caenorhabditis elegans transgenic strains.
  • The secondary effects of these collagen mutations on organismal physiology are not fully understood.

Purpose of the Study:

  • To investigate and compare the mitochondrial function between wild-type (N2) and collagen mutant (dpy-10, rol-6, PE255) Caenorhabditis elegans strains.
  • To characterize the secondary effects of collagen mutations on mitochondrial and nuclear DNA copy numbers and whole-worm respirometry.

Main Methods:

  • Comparative analysis of mitochondrial function in N2, dpy-10, rol-6, and PE255 C. elegans strains.
  • Measurement of whole-worm respirometry and ATP levels.
  • Quantification of mitochondrial DNA and nuclear DNA copy numbers.

Main Results:

  • N2 worms displayed approximately double the volume, mitochondrial DNA copy number, and nuclear DNA copy number compared to collagen mutants (p<0.05).
  • Whole-worm respirometry and ATP levels were elevated in N2 worms.
  • Differences in respirometry between strains were substantially reduced when normalized to mitochondrial DNA copy number.

Conclusions:

  • Collagen mutations in C. elegans are associated with reduced mitochondrial and nuclear DNA copy numbers.
  • Despite differences in DNA copy number, the intrinsic mitochondrial function of rol-6 and dpy-10 mutants is comparable to N2 worms when accounting for developmental stage.
  • Developmental delay in collagen mutants influences overall metabolic measurements.