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Related Experiment Videos

Factors affecting ectopic gene conversion in mice

D M Cooper1, K J Schimenti, J C Schimenti

  • 1The Jackson Laboratory, Bar Harbor, Maine 04609, USA.

Mammalian Genome : Official Journal of the International Mammalian Genome Society
|May 8, 1998
PubMed
Summary
This summary is machine-generated.

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Mammalian genomes avoid high ectopic recombination rates through mechanisms that limit gene conversion between repetitive sequences. Homology length and genetic background significantly influence these recombination frequencies in the male germline.

Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • Duplicated genes and repetitive sequences are common in complex organisms.
  • Homology between these sequences can lead to nonallelic (ectopic) recombination, potentially causing harmful genomic rearrangements.
  • High levels of ectopic exchange in mammals could result in aneuploidy and genome instability.

Purpose of the Study:

  • To investigate the factors regulating ectopic recombination in the male germline of mice.
  • To evaluate the impact of homology length on gene conversion between unlinked sequences.
  • To understand how genetic background influences ectopic recombination frequency.

Main Methods:

  • Utilized lacZ transgenes with varying lengths of homology (2557 bp, 1214 bp, 624 bp) in mice.

Related Experiment Videos

  • Compared gene conversion rates between transgenes in different genetic backgrounds (CF1 vs. C57BL/6J).
  • Assessed ectopic recombination frequency in the male germline.

    • Main Results:

    • Gene conversion frequency was significantly reduced (by over an order of magnitude) when transgenes were transferred from a CF1 to a C57BL/6J genetic background.
    • Conversion rates decreased as homology length decreased; 1214 bp showed lower rates than 2557 bp, and 624 bp was insufficient for significant gene conversion.
    • Genomic location of sequences may influence their availability for ectopic recombination.

    Conclusions:

    • Mammalian germline recombination machinery appears evolved to prevent high ectopic recombination rates between shorter repetitive sequences, such as the Alu family.
    • Homology length is a critical factor in regulating ectopic gene conversion.
    • Genetic background plays a substantial role in modulating ectopic recombination frequencies.