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

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• 作者：Ramon Everton Ferreira de Araújo ; Cleusa Yoshiko Nagamachi…
• 刊名：Genetica
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：144
• 期：4
• 页码：407-415
• 全文大小：1,210 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Life Sciences
  Animal Genetics and Genomics
  Plant Genetics and Genomics
  Human Genetics
  Microbial Genetics and Genomics
  
• 出版者：Springer Netherlands
• ISSN：1573-6857
• 卷排序：144

文摘

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.KeywordsChromosomesBatMeiotic multivalentMultiple translocationsBiodiversity