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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Explosive chromosome evolution and speciation in the gerbil genus Taterillus (Rodentia, Gerbillinae): A case of two new cryptic species
Cytogenetic and Genome Research, Volume 96, No. 1-4, Year 2002
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Description
The five morphologically sibling gerbil species of the genus Taterillus in West Africa were first identified from karyotypes. These species possess an XX/XY1 Y2 sex-chromosome system and are characterized by significant karyotypic reorganization, thus making them a suitable model for studying the role of chromosomal rearrangements in the speciation process. We present here a description of two new cytotypes, Taterillus sp. 1 and Taterillussp. 2, from the Lake Chad area, the former having a 2n = 22/23, NFa = 40, and the latter 2n = 24/25, NFa = 44. Comparison of their G- and C- banding patterns with those of T. pygargus (2n = 22/23, NFa = 38/40), examined in an earlier paper, revealed that all three species differ from each other by 7 to 11 chromosomal rearrangements, comprising tandem translocations, pericentric inversions, and Robertsonian metacentrics displaying monobrachial homology. Meiotic configurations formed in potential hybrids among any of these three forms would consist of complex rings and chains, alone or in combination, resulting, as expected, in a significant disruption of gametogenesis. These results provide support for assigning Taterillussp. 1 and Taterillus sp. 2 to two different biological species, which, as demonstrated by our preliminary molecular studies, would have emerged recently. Possible factors responsible for the rapid karyotypic evolution and speciation in this West African gerbil complex are discussed. Copyright © 2002 S. Karger AG, Basel.
Authors & Co-Authors
Dobigny, Gauthier
France, Paris
Museum National D'histoire Naturelle
Aniskin, Vladimir M.
Russian Federation, Moscow
Russian Academy of Sciences
Volobouev, Vitaly T.
France, Paris
Museum National D'histoire Naturelle
Statistics
Citations: 54
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1159/000063044
ISSN:
14248581
Study Locations
Multi-countries
Chad