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Microsatellite distribution on sex chromosomes at different stages of heteromorphism and heterochromatinization in two lizard species (Squamata: Eublepharidae: Coleonyx elegans and Lacertidae: Eremias velox)

  1. 1.
    0381524 - UZFG-Y 2013 RIV GB eng J - Článek v odborném periodiku
    Pokorná, Martina - Kratochvíl, L. - Kejnovský, Eduard
    Microsatellite distribution on sex chromosomes at different stages of heteromorphism and heterochromatinization in two lizard species (Squamata: Eublepharidae: Coleonyx elegans and Lacertidae: Eremias velox).
    B M C Genetics. Roč. 12, č. 1 (2011), s. 90-96. ISSN 1471-2156
    Grant CEP: GA ČR GAP506/10/0718; GA ČR(CZ) GAP305/10/0930
    Výzkumný záměr: CEZ:AV0Z50450515; CEZ:AV0Z50040702
    Klíčová slova: repeated dna-sequences * Y-chromosome * determining mechanisms
    Kód oboru RIV: EB - Genetika a molekulární biologie
    Impakt faktor: 2.475, rok: 2011

    The accumulation of repetitive sequences such as microsatellites during the differentiation of sex chromosomes has not been studied in most squamate reptiles (lizards, amphisbaenians and snakes), a group which has a large diversity of sex determining systems. It is known that the Bkm repeats containing tandem arrays of GATA tetranucleotides are highly accumulated on the degenerated W chromosomes in advanced snakes. Similar, potentially homologous, repetitive sequences were found on sex chromosomes in other vertebrates. Using FISH with probes containing all possible mono-, di-, and tri-nucleotide sequences and GATA, we studied the genome distribution of microsatellite repeats on sex chromosomes in two lizard species (the gecko Coleonyx elegans and the lacertid Eremias velox) with independently evolved sex chromosomes. The gecko possesses heteromorphic euchromatic sex chromosomes, while sex chromosomes in the lacertid are homomorphic and the W chromosome is highly heterochromatic. Our aim was to test whether microsatellite distribution on sex chromosomes corresponds to the stage of their heteromorphism or heterochromatinization. Moreover, because the lizards lie phylogenetically between snakes and other vertebrates with the Bkm-related repeats on sex chromosomes, the knowledge of their repetitive sequence is informative for the determination of conserved versus convergently evolved repetitive sequences across vertebrate lineages.
    Trvalý link: http://hdl.handle.net/11104/0211975
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