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G- and C-banded karyotype of the markhor Capra falconeri heptneri, and comparison of its banding patterns with the Alpine ibex Capra ibex and cattle Bos taurus

100%

Lux E., Perez M., Volobouev V. T.

Acta Theriologica

2004

tom 49

nr 1

Here we present the first data on chromosome banding for Capra falconeri heptneri (Zalkin, 1945) (Bovidae: Caprinae), a critically endangered subspecies of the markhor, and compare its G- and C-banding patterns with those of the congeneric Alpine ibex C. ibex Linnaeus, 1758 and the evolutionary more distant cattle Bos taurus Linnaeus, 1758. The two goat species have identical karyotypes whereas B. taurus, which has the same diploid number (2n = 60) and autosomal fundamental number (aFN) differs in the morphology of two pairs of autosomes (9 and 14) and of the X chromosome, as well as in the amount of C heterochromatin. Although the study supports the earlier idea of karyotype homogeneity within the genus Capra, new comparative cytogenetic data for unstudied yet congeneric and other related species are necessary for our understanding of the pattern of chromosome evolution within the subfamily Caprinae and, more broadly, the family Bovidae.

Kayrotype of the rare Johnston's genet Genetta johnstoni [Viverridae] and a reassessment of chromosomal characterization among congeneric species

88%

Gaubert P., Aniskin V. M., Dunham A. E., Cremiere C., Volobouev V. T.

Acta Theriologica

2004

tom 49

nr 4

We present herein new data on karyotypes of members of the genusGenetta. G- and C-banded chromosomes of the Johnston’s genetGenetta johnstoni Pocock, 1908 (2n = 50 / FNa = 92) are described for the first time, and compared with those ofG. genetta (2n = 54 / FNa = 92). In addition, the standard karyotype ofG. maculata (2n = 52 / FNa = 96) was studied. A reassessment of taxonomic attribution of previously published material allowed us to characterize (2n, FNa, and chromosome morphology) the karyotypes of three genets, previously unknown (G. pardina, G. letabae andG. tigrina). Our results show that despite a rather low interspecific variability in 2n and FNa, all the species of genets (exceptG. pardina andG. maculata) appear differentiated when chromosomal morphology is taken into account. Although chromosomal banding data are limited, confrontation of G-band karyotypes with preliminary molecular phylogenetic results reveals that karyotypic evolution within the genusGenetta might involve various rearrangements like Robertsonian and tandem translocations, pericentric inversions, and centromere fissions; thus providing at least for some taxa a solid postzygotic isolation. Finally, our study suggests that cytogenetic analyses might constitute a useful tool for questioning interspecific boundaries, especially within the taxonomically debated complex of large-spotted genets.

Ograniczanie wyników

2 Acta Theriologica

2 Volobouev V. T.

1 Aniskin V. M.

1 Cremiere C.

1 Dunham A. E.

1 Gaubert P.

1 Lux E.

1 Perez M.

2 2004

Wyniki wyszukiwania

G- and C-banded karyotype of the markhor Capra falconeri heptneri, and comparison of its banding patterns with the Alpine ibex Capra ibex and cattle Bos taurus

Kayrotype of the rare Johnston's genet Genetta johnstoni [Viverridae] and a reassessment of chromosomal characterization among congeneric species