Intrachromosomal distribution of telomeric repeats in Eumops glaucinus and eumops perotis (Molossidae, Chiroptera)
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Data
2000-12-04
Autores
Okumura Finato, Adriana [UNESP]
Varella-Garcia, Marileila
Tajara, Eloisa Helena [UNESP]
Taddei, Valdir Antonio [UNESP]
Morielle-Versute, Eliana [UNESP]
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Resumo
The location of chromosomal telomeric repeats (TTAGGG)(n) was investigated in two species of the Molossidae family, Eumops glaucinus and Eumops perotis. The diploid chromosome number (2n) is 40 in E. glaucinus and 48 in E. perotis and the fundamental numbers (FN) are 64 and 58, respectively. It has been suggested that the E. glaucinus karyotype has evolved from the E. perotis karyotype through Robertsonian fusion events. In the present study, the telomeric sequences were detected at the termini of chromosomes in both species. In addition, E. glaucinus also displayed telomeric repeats in centromeric and pericentromeric regions in almost all biarmed chromosomes. Conversely, in E. perotis pericentromeric signals were only observed in two biarmed chromosomes. In both E. glaucinus and E. perotis, such telomeric sequences were observed as part of the heterochromatin. The interstitial sites of telomeric sequences suggest that they are remnants of telomeres of ancestral chromosomes that participated in the fusion event.
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Bats, Chiroptera, Cytogenetics, FISH, Telomeric sequence, repetitive DNA, animal cell, bat, centromere, chromosome arm, diploidy, DNA sequence, heterochromatin, karyotype evolution, nonhuman, priority journal, Robertsonian chromosome translocation, species difference, telomere, Animals, Chromosome Painting, Chromosomes, In Situ Hybridization, Fluorescence, Karyotyping, Repetitive Sequences, Nucleic Acid, Telomere, Animalia, Eumops glaucinus, Eumops perotis, Mammalia, Molossidae, Perotis, Robertsonia
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Chromosome Research, v. 8, n. 7, p. 563-569, 2000.