Abstract
We used chromosome painting with chromosome-specific probes derived from domestic sheep and pig for a high-resolution cytogenetic comparison with the karyotype of collared peccary (Pecari tajacu sonoriensis). A reorganization of the karyotype involving at least 62–66 conserved segments were observed between the sheep and collared peccary. This is an extremely high number compared with other members of the same mammalian order (Cetartiodactyla). The comparison between pig and collared peccary, both belonging to the Suiformes, however, revealed various changes in the gross organization of both karyotypes that may have already occurred in a common ancestor of both species suggesting a monophyletic origin of Suidae/Tayassuidae. The sheep probes, however, also revealed several rearrangements between the two Suidae/Tayassuidae, indicating that these probes represent a useful tool for a more detailed analysis of the evolutionary history of Suiformes. Our sample of the collared peccary from North America (Arizona, USA) showed distinct differences to those already described from South America. The chromosome painting results defined a complex translocation that involves chromosomes including about one-quarter of the entire collared peccary karyotype. This considerable rearrangement indicates subspecies or even species status of both peccary populations, as it should present a significant barrier for their hybridization.
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Adega, F., Chaves, R., Kofler, A. et al. High-resolution comparative chromosome painting in the Arizona collared peccary (Pecari tajacu, Tayassuidae): a comparison with the karyotype of pig and sheep. Chromosome Res 14, 243–251 (2006). https://doi.org/10.1007/s10577-006-1040-y
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DOI: https://doi.org/10.1007/s10577-006-1040-y