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

• Published in: Genetica Vol. 144; no. 4; pp. 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: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.08.2016; Springer Nature B.V
• 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; Meiotic multivalent; Multiple translocations; Bat; Biodiversity; Chromosomes
• ISSN: 0016-6707; 1573-6857
• DOI: 10.1007/s10709-016-9909-y

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.