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Transmission ratio distortion in mice.

Mary F Lyon1

  • 1Mammalian Genetics Unit, Medical Research Council, Harwell, Didcot, Oxon OX11 0RD, United Kingdom. m.lyon@har.mrc.ac.uk

Annual Review of Genetics
|November 18, 2003
PubMed
Summary

Transmission ratio distortion (TRD) in mice, caused by the t-complex on Chromosome 17, affects inheritance patterns. Researchers identified genes responsible for this distortion and impaired sperm function in males.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Reproductive Biology

Background:

  • Transmission ratio distortion (TRD) is a phenomenon where certain alleles are preferentially transmitted to offspring.
  • The t-complex in mice, a polymorphic region on Chromosome 17, is a well-studied example of TRD.
  • Males heterozygous for t-haplotypes show distorted inheritance, transmitting the t-haplotype to over 50% of progeny.

Purpose of the Study:

  • To investigate the genetic basis of TRD in the mouse t-complex.
  • To identify the specific distorter (Tcd) and responder (Tcr) genes involved in TRD.
  • To understand the molecular mechanisms underlying impaired sperm function in t/t homozygous males.

Main Methods:

  • Genetic analysis of t-haplotypes and their associated inversions.
  • Identification and characterization of candidate distorter and responder genes.
  • Sperm function assays to evaluate motility in males with different t-haplotype genotypes.

Main Results:

  • The t-complex TRD is mediated by distorter genes (Tcd) acting on a responder gene (Tcr).
  • Responder gene identified as a fusion gene involving sperm motility kinase and ribosomal S6 kinase.
  • Three candidate distorter genes, coding for dynein chains, implicated in sperm flagellar function.

Conclusions:

  • The study elucidates the genetic architecture of t-complex TRD.
  • Identified genes provide insights into the molecular basis of sperm motility defects.
  • Understanding TRD mechanisms is crucial for evolutionary genetics and reproductive biology.

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