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Gene flow of unique sequences between Mus musculus domesticus and Mus spretus

R Greene-Till1, Y Zhao, S C Hardies

  • 1Department of Biochemistry, University of Texas Health Science Center, San Antonio 78284-7760, USA.

Mammalian Genome : Official Journal of the International Mammalian Genome Society
|March 21, 2000
PubMed

Insights

Genetic analysis reveals gene flow between Mus musculus domesticus and Mus spretus species. Sequencing identified identical unique sequences in C57BL/KsJ and M. spretus, indicating interspecies transfer.

Area of Science:

  • Genetics
  • Evolutionary Biology
  • Mammalian Genetics

Background:

  • Investigating genetic diversity within and between Mus species is crucial for understanding evolutionary processes.
  • Previous studies indicated limited interspecies DNA transfer, but the extent and mechanism remained unclear.

Purpose of the Study:

  • To investigate the extent of allelic diversity and potential gene flow between Mus musculus subspecies and Mus spretus.
  • To determine the origin of a unique sequence found in the M. m. domesticus inbred strain C57BL/KsJ.

Main Methods:

  • Sequencing of a 453-bp unique sequence locus across various Mus subspecies and Mus spretus strains.
  • Analysis of M. spretus-specific repetitive sequences in the C57BL/KsJ strain.
  • Comparative genomic analysis to assess sequence identity and potential hybridization.

Main Results:

  • A unique sequence in the M. m. domesticus strain C57BL/KsJ was found to be identical to sequences in Mus spretus isolates.
  • Further analysis ruled out misidentification or hybridization as the cause for the sequence identity.
  • Evidence for detectable unique sequence flow between M. m. domesticus and M. spretus was established, alongside ancestral polymorphism in M. spretus alleles.

Conclusions:

  • The study confirms detectable unique sequence gene flow between Mus musculus domesticus and Mus spretus.
  • Findings highlight the complexity of distinguishing between ancestral polymorphism and interspecies gene transfer in population genetics.
  • The results necessitate a re-evaluation of genetic exchange dynamics in closely related rodent species.

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