A comparative chromosome banding analysis of the Ursidae and their relationship to other carnivores
作者:
W.G. Nash,
S.J. O’Brien,
期刊:
Cytogenetic and Genome Research
(Karger Available online 1987)
卷期:
Volume 45,
issue 3-4
页码: 206-212
ISSN:1424-8581
年代: 1987
DOI:10.1159/000132455
出版商: S. Karger AG
数据来源: Karger
摘要:
Trypsin G-banded karyotypes of eight species of Ursidae were prepared from retrovirus-transformed skin fibroblast cultures. The banding patterns of all bears are highly conserved, even though their diploid numbers range from 42 to 72. A comprehensive analysis of the homologous banding patterns within the Ursidae and with a hypothesized ancestral carnivore karyotype permitted the reconstruction of three significant chromosomal reorganization events that occurred during the evolution of the modern ursids. The first was a multichromosomal fissioning away from the biarmed (2n = 44) primitive carnivore karyotype, leading to six species of the Ursinae subfamily (2n = 78). The second was a comprehensive chromosome fusion in the lineage that led to the Ailuropodinae (giant panda) subfamily (2n = 44). The third event was a second, independent, but less extensive, centromeric fusion occurring in the line that led to the Tremarctinae (spectacled bear) subfamily (2n = 52). Ursidae karyotypes are not only highly conserved within the family but also exhibit extensive chromosome banding homology with other carnivore families.
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