Sister chromosome pairing maintains heterozygosity in parthenogenetic lizards

Aracely A. Lutes, William B. Neaves, Diana P. Baumann, Winfried Wiegraebe and Peter Baumann ()
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Aracely A. Lutes: Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
William B. Neaves: Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
Diana P. Baumann: Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
Winfried Wiegraebe: Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
Peter Baumann: Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA

Nature, 2010, vol. 464, issue 7286, 283-286

Abstract: The female is the species The existence of an all-female species of whiptail lizard, formed as a hybrid between sexual species, has been known since 1962. But how it produces mature eggs with a full somatic chromosomal complement has remained unclear, as has a mechanism for maintaining genetic diversity. Lutes et al. now show that in this species (Aspidoscelis tesselata) meiosis initiates with twice the number of chromosomes, compared to sexual species, and that pairing and recombination take place between genetically identical sister chromosomes instead of between homologues.

Date: 2010
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DOI: 10.1038/nature08818

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