Biology Faculty Articles

Title

A Comparative Chromosome Banding Analysis of the Ursidae and Their Relationship to Other Carnivores

Document Type

Article

Publication Date

1987

Publication Title

Cytogenetics and Cell Genetics

ISSN

0301-0171

Volume

45

Issue/No.

3-4

First Page

206

Last Page

212

Abstract

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.

ORCID ID

0000-0001-7353-8301

ResearcherID

N-1726-2015

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