Molecular Cytogenetics of the Equidae: III. Cytological Localization of Heterochromatin and Satellite DNA in Hartmann’s Mountain Zebra, Equus zebra hartmannae (Matschie, 1898)

Ryder, Oliver A.

doi:10.1007/978-3-642-61749-2_13

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“…In whales (Arnason et al, 1978;Arnason and Widegren, 1989) and cats (Fanning, 1987) subterminal heterochromatin has been found to be composed of interrupted repeats with sequence similarities close to that of the telomeric (TTAGGG) n sequence. Other studies by Ryder and Hansen (1979), Gadi and Ryder (1983) and Ryder (1984) demon-strated that many of the heterochromatic regions on equid chromosomes were composed of highly repetitive satellite DNA. Although the (TTAGGG) n probes hybridized to some heterochromatic regions in E. asinus, they did not show the same hybridization patterns as the satellite probe used by Gadi and Ryder.…”

Section: Discussionmentioning

confidence: 99%

Chromosomal distribution of the telomere sequence (TTAGGG)<sub>n</sub> in the Equidae

Lear¹

2001

Cytogenet Genome Res

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Telomeres are a class of repetitive DNA sequences that are located at chromosome termini and that act to stabilize the chromosome ends. The rapid karyotypic evolution of the genus Equus has given rise to ten taxa, all with different diploid chromosome numbers. Using fluorescence in situ hybridization (FISH) we localized the mammalian telomere sequence, (TTAGGG)_n, to the chromosomes of nine equid taxa. TTAGGG signal was located at chromosome termini in all species, however additional signal was seen at interstitial sites on some chromosomes in the Burchell’s zebra, Equus quagga burchelli, the Hartmann’s zebra, Equus zebra hartmannae, and at large heterochromatin-associated regions on the chromosomes of the donkey, Equus asinus. The interstitial signal in the zebras may be a relic of an ancient telomere-telomere fusion and mark the point at which two ancestral chromosomes may have fused. For the donkey, the heterochromatin-associated signal may represent degenerate telomere-like satellite sequences and identify a second type of satellite DNA for this taxon.

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Section: Discussionmentioning

confidence: 99%

Chromosomal distribution of the telomere sequence (TTAGGG)<sub>n</sub> in the Equidae

Lear¹

2001

Cytogenet Genome Res

View full text Add to dashboard Cite

show abstract

Molecular Cytogenetics of the Equidae: III. Cytological Localization of Heterochromatin and Satellite DNA in Hartmann’s Mountain Zebra, Equus zebra hartmannae (Matschie, 1898)

Cited by 1 publication

References 14 publications

Chromosomal distribution of the telomere sequence (TTAGGG)<sub>n</sub> in the Equidae

Chromosomal distribution of the telomere sequence (TTAGGG)<sub>n</sub> in the Equidae

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