Počet záznamů: 1  

Cytogenetics of the Javan file snake (Acrochordus javanicus) and the evolution of snake sex chromosomes

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    0488580 - ÚŽFG 2019 RIV US eng J - Článek v odborném periodiku
    Rovatsos, M. - Altmanová, Marie - Johnson Pokorná, Martina - Augstenová, B. - Kratochvíl, L.
    Cytogenetics of the Javan file snake (Acrochordus javanicus) and the evolution of snake sex chromosomes.
    Journal of Zoological Systematics and Evolutionary Research. Roč. 56, č. 1 (2018), s. 117-125. ISSN 0947-5745. E-ISSN 1439-0469
    Institucionální podpora: RVO:67985904
    Klíčová slova: GATA * genome organization * sex determination
    Obor OECD: Zoology
    Impakt faktor: 2.268, rok: 2018

    Advanced snakes (Caenophidia) are an important group including around 90% of the recent species of snakes. The basal splitting of the clade is still rather controversial, and it is not fully understood when the differentiation of sex chromosomes started in snake evolution. To help resolve these questions, we performed cytogenetic analysis on the Javan file snake, also known as the elephant trunk snake (Acrochordus javanicus) from the family Acrochordidae, which occupies an informative phylogenetic position. For the first time for acrochordids, we identified heteromorphic ZZ/ZW sex chromosomes with a highly heterochromatic W chromosome. These traits are likely synapomorphies of advanced snakes. In contrast to other caenophidian snakes, the Javan file snake lacks an accumulation of Bkm repeats and interstitial telomeric repeats on the W chromosome. This observation supports the sister group relationship between acrochordids and all other caenophidian snakes including the family Xenodermatidae and questions the suggested role of Bkm repeats in the formation of sex heterochromatin in snakes. The revealed partial gene content of the Z chromosome in acrochordids supports the hypothesis that the progressive degeneration of the W chromosome commenced in snakes before the basal split of Caenophidia, albeit its evolutionary rate in file snakes might be slower than in their sister lineage.
    Trvalý link: http://hdl.handle.net/11104/0283153

     
     
Počet záznamů: 1  

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