Little evidence for switches to environmental sex determination and turnover of sex chromosomes in lacertid lizards

0506135 - ÚŽFG 2020 RIV GB eng J - Článek v odborném periodiku
Rovatsos, Michail - Vukič, J. - Mrugala, A. - Suwala, Grzegorz - Lymberakis, P. - Kratochvíl, L.
Little evidence for switches to environmental sex determination and turnover of sex chromosomes in lacertid lizards.
Scientific Reports. Roč. 9, May 24 (2019), č. článku 7832. ISSN 2045-2322. E-ISSN 2045-2322
Grant CEP: GA ČR GA17-22604S
Institucionální podpora: RVO:67985904
Klíčová slova: determining mechanisms * sex determination
Obor OECD: Genetics and heredity (medical genetics to be 3)
Impakt faktor: 3.998, rok: 2019
Způsob publikování: Open access
https://www.nature.com/articles/s41598-019-44192-5

Amniotes possess variability in sex determination, from environmental sex determination (ESD), where no sex chromosomes are present, to genotypic sex determination (GSD) with highly differentiated sex chromosomes. Some evolutionary scenarios postulate high stability of differentiated sex chromosomes and rare transitions from GSD to ESD. However, sex chromosome turnovers and two independent transitions from highly differentiated ZZ/ZW sex chromosomes to ESD were previously reported in the lacertid lizards. Here, we examined the homology of sex chromosomes in the wide phylogenetic spectrum of lacertids and their outgroups by comparing gene copy numbers between sexes in genes previously found to be Z-specific in some lacertids. Our current sampling covers 45 species from 26 genera including lineages supposed to possess a derived sex determining systems. We found that all tested lacertids share homologous differentiated ZZ/ZW sex chromosomes, which were present already in their common ancestor living around 85 million years ago. These differentiated sex chromosomes are not present in amphisbaenians and teiid lizards, the close relatives of lacertids. Our study demonstrates how inaccuracies in data can influence the outcome of phylogenetic reconstructions of evolution of sex determination, in this case they overestimated the number of shifts from GSD to ESD and the rate in turnovers of sex chromosomes.
Trvalý link: http://hdl.handle.net/11104/0297398