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Microsatellite evolution: testing the ascertainment bias hypothesis

A M Crawford1, S M Kappes, K A Paterson

  • 1AgResearch Molecular Biology Unit, Centre for Gene Research and Department of Biochemistry, University of Otago, PO Box 56, Dunedin, New Zealand. crawforda@agresearch.cri.nz

Journal of Molecular Evolution
|March 7, 1998
PubMed
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Microsatellite allele lengths differ between sheep and cattle, with sheep consistently showing longer alleles. This suggests ascertainment bias in microsatellite marker selection plays a minor role in observed variations.

Area of Science:

  • Genetics
  • Molecular Biology
  • Comparative Genomics

Background:

  • Microsatellite markers are widely used in population genetics.
  • Previous research indicated that microsatellite allele lengths are often longest in the species of origin, suggesting ascertainment bias.
  • Ascertainment bias can influence the interpretation of genetic diversity studies.

Purpose of the Study:

  • To investigate whether microsatellite allele size distribution between sheep and cattle is dependent on the species of origin for the markers.
  • To assess the impact of ascertainment bias on observed microsatellite variation in sheep and cattle.

Main Methods:

  • Utilized a set of 472 microsatellite markers amplifiable in both sheep and cattle.
  • Analyzed the size distribution of microsatellite alleles in polymorphic markers within both species.

Related Experiment Videos

  • Compared median allele sizes between sheep and cattle, considering marker origin.

    • Main Results:

    • A significantly greater number of markers exhibited longer median allele sizes in sheep compared to cattle (P < 0.001).
    • This pattern held true regardless of whether the microsatellite markers originated from sheep or cattle.
    • The observed allele size differences were not solely attributable to ascertainment bias.

    Conclusions:

    • Microsatellite allele size distribution between sheep and cattle is not source-dependent.
    • Ascertainment bias appears to be a minor factor in the observed variation of microsatellite allele sizes between these species.
    • The findings have implications for the use and interpretation of microsatellite data in comparative genetic studies.