Long microsatellites and unusually high levels of genetic diversity in the Orthoptera

Chapuis Marie Pierre, Streiff Réjane, Sword Gregory A.. 2012. Long microsatellites and unusually high levels of genetic diversity in the Orthoptera. Insect Molecular Biology, 21 (2) : pp. 181-186.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : ENTOMOLOGY / Quartile : Q2, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY

Abstract : Much remains to be learned about the mutational processes governing the evolution of microsatellite repeat regions and the associated levels of genetic diversity observed at microsatellite markers across populations or species. An extensive survey of microsatellite variation in 210 insect species from six major orders revealed that within Orthopterans, which are characterized by giant genomes, levels of genetic diversity were ~20% higher and microsatellite repeat arrays were longer than in any other group. Because of the mutation dependence on repeat length, this result suggests a higher microsatellite loci mutation rate in the Orthoptera. We deem it plausible that differences among insect orders, either in mismatch repair systems or in abundance of transposable element-derived microsatellites, can shape the size distribution of both genomes and microsatellite repeat regions. Our findings emphasise that observed levels of genetic diversity can greatly vary across species (orders at least) because of molecular differences in the mechanisms that determine microsatellite size, and are therefore critical to conservation and population genetics studies, where microsatellite repeat variability is primarily interpreted in terms of population demography and history. (Résumé d'auteur)

Mots-clés Agrovoc : Orthoptera, Microsatellite, Mutation, Variation génétique, Génome

Classification Agris : 000 - Other themes
H10 - Pests of plants

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

  • Chapuis Marie Pierre, CIRAD-BIOS-UPR Bioagresseurs (FRA)
  • Streiff Réjane, INRA (FRA)
  • Sword Gregory A., University of Sydney (AUS)

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