Počet záznamů: 1  

Evolution of Karyotypes in Chameleons

  1. 1.
    0486746 - ÚŽFG 2018 RIV CH eng J - Článek v odborném periodiku
    Rovatsos, M. - Altmanová, M. - Johnson Pokorná, Martina - Velenský, P. - Baca, A. S. - Kratochvíl, L.
    Evolution of Karyotypes in Chameleons.
    Genes. Roč. 8, č. 12 (2017), č. článku 382. E-ISSN 2073-4425
    Institucionální podpora: RVO:67985904
    Klíčová slova: karyotype evolution * ITS * rDNA
    Obor OECD: Genetics and heredity (medical genetics to be 3)
    Impakt faktor: 3.191, rok: 2017

    The reconstruction of the evolutionary dynamics of karyotypes and sex determining systems in squamate reptiles is precluded by the lack of data in many groups including most chameleons (Squamata: Acrodonta: Chamaeleonidae). We performed cytogenetic analysis in 16 species of chameleons from 8 genera covering the phylogenetic diversity of the family and also phylogenetic reconstruction of karyotype evolution in this group. In comparison to other squamates, chameleons demonstrate rather variable karyotypes, differing in chromosome number, morphology and presence of interstitial telomeric signal (ITS). On the other hand, the location of rDNA is quite conserved among chameleon species. Phylogenetic analysis combining our new results and previously published data tentatively suggests that the ancestral chromosome number for chameleons is 2n = 36, which is the same as assumed for other lineages of the clade Iguania, i.e., agamids and iguanas. In general, we observed a tendency for the reduction of chromosome number during the evolution of chameleons, however, in Rieppeleon brevicaudatus, we uncovered a chromosome number of 2n = 62, very unusual among squamates, originating from a number of chromosome splits. Despite the presence of the highly differentiated ZZ/ZW sex chromosomes in the genus Furcifer, we did not detect any unequivocal sexual differences in the karyotypes of any other studied species of chameleons tested using differential staining and comparative genomic hybridization, suggesting that sex chromosomes in most chameleons are only poorly differentiated.
    Trvalý link: http://hdl.handle.net/11104/0281478

     
     
Počet záznamů: 1  

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