First-Generation Linkage Map of the Gray, Short-Tailed Opossum, Monodelphis domestica, Reveals Genome-Wide Reduction in Female Recombination Rates

Paul B. Samollow, Candace M. Kammerer, Susan M. Mahaney, Jennifer L. Schneider, Scott J. Westenberger, John L. VandeBerg, Edward S. Robinson

    Research output: Contribution to journalArticlepeer-review

    43 Scopus citations

    Abstract

    The gray, short-tailed opossum, Monodelphis domestica, is the most extensively used, laboratory-bred marsupial resource for basic biologic and biomedical research worldwide. To enhance the research utility of this species, we are building a linkage map, using both anonymous markers and functional gene loci, that will enable the localization of quantitative trait loci (QTL) and provide comparative information regarding the evolution of mammalian and other vertebrate genomes. The current map is composed of 83 loci distributed among eight autosomal linkage groups and the X chromosome. The autosomal linkage groups appear to encompass a very large portion of the genome, yet span a sex-average distance of only 633.0 cM, making this the most compact linkage map known among vertebrates. Most surprising, the male map is much larger than the female map (884.6 cM vs. 443.1 cM), a pattern contrary to that in eutherian mammals and other vertebrates. The finding of genome-wide reduction in female recombination in M. domestica, coupled with recombination data from two other, distantly related marsupial species, suggests that reduced female recombination might be a widespread metatherian attribute. We discuss possible explanations for reduced female recombination in marsupials as a consequence of the metatherian characteristic of determinate paternal X chromosome inactivation.

    Original languageEnglish (US)
    Pages (from-to)307-329
    Number of pages23
    JournalGenetics
    Volume166
    Issue number1
    DOIs
    StatePublished - Jan 2004

    ASJC Scopus subject areas

    • Genetics

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