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Related Experiment Videos

T(In1;5)44H, a complex mouse chromosomal rearrangement with a phenotypic effect

E P Evans1, C V Beechey, M D Burtenshaw

  • 1MRC Radiobiology Unit, Didcot, Oxon, UK.

Cytogenetics and Cell Genetics
|January 1, 1993
PubMed
Summary
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A complex chromosomal rearrangement in mice, T(In1;5)44H, was identified after X-irradiation. This genetic abnormality leads to reduced litter sizes and embryonic mortality in carriers.

Area of Science:

  • Genetics
  • Cytogenetics
  • Radiation Biology

Background:

  • Spermatogonial X-irradiation can induce complex chromosomal rearrangements.
  • Understanding these rearrangements is crucial for assessing radiation-induced genetic damage.

Purpose of the Study:

  • To characterize a complex murine chromosomal rearrangement, T(In1;5)44H, induced by fractionated X-irradiation.
  • To investigate the meiotic behavior and reproductive consequences of this rearrangement.

Main Methods:

  • Recovery and characterization of the T(In1;5)44H chromosomal rearrangement in mice.
  • Linkage analysis to determine gene order on chromosomes 1 and 5.
  • Meiotic analysis in heterozygotes to study chromosome pairing and segregation.
  • Assessment of fertility and litter characteristics in carriers.

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Main Results:

  • T(In1;5)44H involves a paracentric inversion of Chromosome 1 and a reciprocal translocation with Chromosome 5.
  • Linkage tests established gene order on Chr 1 (fz-ln-T44H) and Chr 5 (W-T44H-go-bf).
  • Heterozygotes exhibit coat color dilution, reduced fertility, small litter sizes, and a shortage of carrier offspring.
  • Meiotic analysis revealed regular pairing and chiasma formation, producing dicentric chromatids that likely cause embryonic mortality.

Conclusions:

  • The T(In1;5)44H rearrangement, despite its complexity, undergoes regular meiosis.
  • The observed reproductive inefficiencies are attributed to the formation and segregation of dicentric chromatids during meiosis.
  • This study provides insights into the genetic and reproductive consequences of complex chromosomal rearrangements induced by radiation.