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Related Experiment Videos

High-resolution mapping of sperm function defects in the t complex fourth inversion

A A Redkar1, P Olds-Clarke, L M Dugan

  • 1Temple University School of Medicine, Department of Anatomy and Cell Biology, 3400 North Broad Street, Philadelphia, Pennsylvania 19140, USA.

Mammalian Genome : Official Journal of the International Mammalian Genome Society
|September 24, 1998
PubMed
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Structural variants in mouse t haplotypes cause sperm dysfunction. This study maps genes responsible for male sterility and abnormal sperm curvature, revealing complex genetic elements affecting fertilization.

Area of Science:

  • Genetics
  • Reproductive Biology
  • Mammalian Genetics

Background:

  • T haplotypes on mouse chromosome 17 influence sperm function and fertilization.
  • Previous research identified male sterility in specific M. spretus/t haplotype combinations.

Purpose of the Study:

  • To map the genetic loci responsible for t haplotype-specific sperm dysfunction.
  • To analyze the molecular basis of the
  • curlicue
  • sperm flagellar curvature phenotype.
  • To investigate the effects of t haplotypes on sperm's ability to fertilize oocytes.

Main Methods:

  • Quantitative analysis of in vitro fertilization using zona pellucida-free mouse eggs.
  • Mapping of sperm function loci (Hst6, Stop1) using recombinant chromosome 17 homologs.

Related Experiment Videos

  • Phenotypic analysis of sperm flagellar curvature.

    • Main Results:

    • A novel locus, Stop1, was identified distal to Pim1, significantly impacting sperm penetration of the oolemma.
    • Stop1 appears to be a complex locus with at least two genetic elements.
    • The
    • curlicue
    • sperm phenotype is controlled by at least two elements within the Hst6 locus.
    • Higher resolution mapping of t haplotype-associated sperm dysfunction within In(17)4.

    Conclusions:

    • The study refines the mapping of genes causing t haplotype-specific sperm defects.
    • Identified loci (Stop1 and Hst6) provide insight into the genetic control of sperm function and fertilization.
    • Findings contribute to understanding the molecular mechanisms underlying t haplotype-mediated reproductive isolation.