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On the origin of neo-sex chromosomes in the Neotropical dragonflies Rhionaeschna bonariensis and R. planaltica (Aeshnidae, Odonata)
- 1.0565543 - BC 2023 RIV CH eng J - Journal Article
Mola, M. L. - Vrbová, Iva - Tosto, D. S. - Zrzavá, Magda - Marec, František
On the origin of neo-sex chromosomes in the Neotropical dragonflies Rhionaeschna bonariensis and R. planaltica (Aeshnidae, Odonata).
Insects. Roč. 13, č. 12 (2022), č. článku 1159. E-ISSN 2075-4450
Institutional support: RVO:60077344
Keywords : dragonflies * holokinetic chromosomes * nucleolar organizer region
OECD category: Genetics and heredity (medical genetics to be 3)
Impact factor: 3, year: 2022
Method of publishing: Open access
https://www.mdpi.com/2075-4450/13/12/1159/pdf?version=1671152037
Dragonflies and damselflies (Odonata) are very interesting insects from a cytogenetic point of view. Their chromosomes do not have a typical centromere and their meiosis process differs in some respects from the canonical meiosis process. Sex in Odonata is usually determined by two X chromosomes in females and only one X chromosome in males (a Y chromosome is not present). In this work, we studied sex chromosome evolution in two dragonfly species of the genus Rhionaeschna that have a derived sex chromosome system: neo-XX in females and neo-XY in males. This variation is the result of chromosome rearrangements. In R. planaltica, meiotic analysis and fluo- rescence in situ hybridization with a ribosomal DNA probe revealed that the original X chromosome was inserted into the smallest autosome, giving rise to the neo-X chromosome, while the homologous autosome became a neo-Y chromosome. In contrast, the neo-X chromosome in R. bonariensis evolved by a terminal fusion of the original X chromosome with the largest autosome, whose homolog be- came the neo-Y chromosome. Our results suggest an independent origin of neo-sex chromosomes in these dragonfly species and contribute to our understanding of the distinct mechanisms of sex chromosome evolution.
Permanent Link: https://hdl.handle.net/11104/0338938
Number of the records: 1