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t haplotypes in the mouse compromise sperm flagellar function

P Olds-Clarke1, L R Johnson

  • 1Department of Anatomy and Cell Biology, Temple University School of Medicine, Philadelphia, Pennsylvania 19140.

Developmental Biology
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Mouse t haplotypes cause sperm dysfunction by altering motility. Sperm from t haplotype carriers show premature hyperactivation and abnormal flagellar curvature, impacting fertilization potential.

Area of Science:

  • Genetics
  • Reproductive Biology
  • Sperm Motility

Background:

  • t haplotypes are variant forms of mouse chromosome 17.
  • These haplotypes affect spermatogenesis and can cause lethality.
  • All t haplotypes alter sperm function, but the exact nature of dysfunction is unclear.

Purpose of the Study:

  • To determine the specific nature of sperm dysfunction caused by t haplotypes.
  • To investigate whether sperm dysfunction is consistent across different t haplotypes.
  • To analyze sperm from genetically similar mice with varying t haplotype loads.

Main Methods:

  • Studied sperm from mice carrying no, one, or two t haplotypes within the same genetic strain.
  • Assessed sperm motility parameters, including hyperactivation, capacitation, and acrosome reaction.

Related Experiment Videos

  • Examined sperm flagellar curvature and initial motility rates.
  • Investigated the role of exogenous calcium in observed motility defects.

    • Main Results:

    • Sperm from tw32/+, tw5/+, and tw32/tw5 mice exhibited premature hyperactivation.
    • Capacitation and spontaneous acrosome reaction rates were similar to wild-type.
    • Abnormal sperm flagellar curvature ('fishhook' appearance in heterozygotes, curled flagellum in tw32/tw5).
    • Reduced initial motility observed in sperm from tw32/tw5 mice.
    • Motility defects were dependent on exogenous calcium.

    Conclusions:

    • t haplotypes induce specific, calcium-sensitive sperm motility defects.
    • These defects, including premature hyperactivation and abnormal flagellar curvature, likely contribute to impaired fertilization.
    • The findings suggest t haplotypes may encode an abnormal, calcium-sensitive flagellar component.