First description of multivalent ring structures in eutherian mammalian meiosis: new chromosomal characterization of Cormura brevirostris (Emballonuridae, Chiroptera)

Twelve specimens of the bat Cormura brevirostris (Emballonuridae: Chiroptera) were collected from four localities in the Brazilian Amazon region and analyzed by classical and molecular cytogenetics. The diploid number and autosomal fundamental number were as previously reported (2n = 22 and FNa = 40...

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Bibliographic Details
Published in:Genetica 2016-08, Vol.144 (4), p.407-415
Main Authors: de Araújo, Ramon Everton Ferreira, Nagamachi, Cleusa Yoshiko, da Costa, Marlyson Jeremias Rodrigues, Noronha, Renata Coelho Rodrigues, Rodrigues, Luís Reginaldo Ribeiro, Pieczarka, Julio César
Format: Article
Language:English
Subjects:
Animal Genetics and Genomics
Animals
Biodiversity
Biomedical and Life Sciences
Brazil
Chiroptera
Chiroptera - classification
Chiroptera - genetics
Chromosome Banding
Chromosomes
Cormura brevirostris
Emballonuridae
Eutheria
Evolutionary Biology
Female
Geography
Human Genetics
In Situ Hybridization, Fluorescence
Life Sciences
Male
Meiosis - genetics
Microbial Genetics and Genomics
Plant Genetics and Genomics
RNA, Ribosomal, 18S - genetics
Silver
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Summary:Twelve specimens of the bat Cormura brevirostris (Emballonuridae: Chiroptera) were collected from four localities in the Brazilian Amazon region and analyzed by classical and molecular cytogenetics. The diploid number and autosomal fundamental number were as previously reported (2n = 22 and FNa = 40, respectively). Fluorescence in situ hybridization using rDNA probes and silver nitrate technique demonstrated the presence of two NOR sites and the presence of internal telomeric sequences at pericentromeric regions of all chromosomes with exception of Y. Based on meiotic studies and chromosome banding we suggest that the sex chromosome pair of C. brevirostris was equivocally identified as it appears in the literature. Meiotic analysis demonstrated that at diplotene–diakinesis the cells had a ring conformation involving four chromosome pairs. This suggests the occurrence of multiple reciprocal translocations among these chromosomes, which is a very rare phenomenon in vertebrates, and has never been described in Eutheria.
ISSN:0016-6707
1573-6857
DOI:10.1007/s10709-016-9909-y