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Conserved sex chromosomes and karyotype evolution in monitor lizards (Varanidae)
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SYSNO ASEP 0511995 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Conserved sex chromosomes and karyotype evolution in monitor lizards (Varanidae) Author(s) Iannucci, A. (IT)
Altmanová, Marie (UZFG-Y) ORCID
Ciofi, C. (IT)
Ferguson-Smith, M. A. (GB)
Milan, M. (IT)
Pereira, J. (PT)
Pether, J. (ES)
Řehák, I. (CZ)
Rovatsos, Michail (UZFG-Y) ORCID
Stanyon, R. (IT)
Velenský, P. (CZ)
Ráb, Petr (UZFG-Y) RID, ORCID
Kratochvíl, L. (CZ)
Johnson Pokorná, Martina (UZFG-Y) ORCIDSource Title Heredity - ISSN 0018-067X
Roč. 123, č. 2 (2019), s. 215-227Number of pages 13 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords Varanidae ; sex chromosomes Subject RIV EB - Genetics ; Molecular Biology OECD category Genetics and heredity (medical genetics to be 3) Method of publishing Limited access Institutional support UZFG-Y - RVO:67985904 UT WOS 000474747800011 EID SCOPUS 85060539870 DOI 10.1038/s41437-018-0179-6 Annotation Despite their long history with the basal split dating back to the Eocene, all species of monitor lizards (family Varanidae) studied so far share the same chromosome number of 2n = 40. However, there are differences in the morphology of the macrochromosome pairs 5-8. Further, sex determination, which revealed ZZ/ZW sex microchromosomes, was studied only in a few varanid species and only with techniques that did not test their homology. The aim of this study was to (i) test if cryptic interchromosomal rearrangements of larger chromosomal blocks occurred during the karyotype evolution of this group, (ii) contribute to the reconstruction of the varanid ancestral karyotype, and (iii) test homology of sex chromosomes among varanids. We investigated these issues by hybridizing flow sorted chromosome paints from Varanus komodoensis to metaphases of nine species of monitor lizards. The results show that differences in the morphology of the chromosome pairs 5-8 can be attributed to intrachromosomal rearrangements, which led to transitions between acrocentric and metacentric chromosomes in both directions. We also documented the first case of spontaneous triploidy among varanids in Varanus albigularis. The triploid individual was fully grown, which demonstrates that polyploidization is compatible with life in this lineage. We found that the W chromosome differs between species in size and heterochromatin content. The varanid Z chromosome is clearly conserved in all the analyzed species. Varanids, in addition to iguanas, caenophidian snakes, and lacertid lizards, are another squamate group with highly conserved sex chromosomes over a long evolutionary time. Workplace Institute of Animal Physiology and Genetics Contact Jana Zásmětová, knihovna@iapg.cas.cz, Tel.: 315 639 554 Year of Publishing 2020 Electronic address https://asep.lib.cas.cz/arl-cav/cs/csg/?repo=crepo1&key=43770151593
Number of the records: 1