Intrachromosomal distribution of telomeric repeats in Eumops glaucinus and Eumops perotis (Molossidae, Chiroptera) |
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Authors: | Adriana Okumura Finato Marileila Varella-Garcia Eloisa Helena Tajara Valdir Antonio Taddei Eliana Morielle-Versute |
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Institution: | (1) Department of Genetics, IB-UNESP, Botucatu, SP, Brazil;(2) Cancer Center Campus, University of Colorado Health Sciences Center, Denver, USA;(3) Department of Biology, IBILCE–UNESP, São José do Rio Preto, SP, Brazil;(4) Department of Zoology, 15.054-000, IBILCE–UNESP, São José do Rio Preto, SP, Brazil |
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Abstract: | 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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Keywords: | bats Chiroptera cytogenetics FISH telomeric sequence |
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