{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,10]],"date-time":"2026-01-10T19:18:36Z","timestamp":1768072716488,"version":"3.49.0"},"reference-count":76,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2022,7,1]],"date-time":"2022-07-01T00:00:00Z","timestamp":1656633600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001824","name":"Czech Science Foundation","doi-asserted-by":"publisher","award":["GA\u010cR 20-27236J"],"award-info":[{"award-number":["GA\u010cR 20-27236J"]}],"id":[{"id":"10.13039\/501100001824","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001824","name":"Czech Science Foundation","doi-asserted-by":"publisher","award":["GAUK 358522"],"award-info":[{"award-number":["GAUK 358522"]}],"id":[{"id":"10.13039\/501100001824","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001824","name":"Czech Science Foundation","doi-asserted-by":"publisher","award":["204069"],"award-info":[{"award-number":["204069"]}],"id":[{"id":"10.13039\/501100001824","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100007543","name":"Charles University Grant Agency","doi-asserted-by":"publisher","award":["GA\u010cR 20-27236J"],"award-info":[{"award-number":["GA\u010cR 20-27236J"]}],"id":[{"id":"10.13039\/100007543","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100007543","name":"Charles University Grant Agency","doi-asserted-by":"publisher","award":["GAUK 358522"],"award-info":[{"award-number":["GAUK 358522"]}],"id":[{"id":"10.13039\/100007543","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100007543","name":"Charles University Grant Agency","doi-asserted-by":"publisher","award":["204069"],"award-info":[{"award-number":["204069"]}],"id":[{"id":"10.13039\/100007543","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Charles University Research Centre program","award":["GA\u010cR 20-27236J"],"award-info":[{"award-number":["GA\u010cR 20-27236J"]}]},{"name":"Charles University Research Centre program","award":["GAUK 358522"],"award-info":[{"award-number":["GAUK 358522"]}]},{"name":"Charles University Research Centre program","award":["204069"],"award-info":[{"award-number":["204069"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Genes"],"abstract":"<jats:p>The recent discovery of two independently evolved XX\/XY sex determination systems in the snake genera Python and Boa sparked a new drive to study the evolution of sex chromosomes in poorly studied lineages of snakes, where female heterogamety was previously assumed. Therefore, we examined seven species from the genera Eryx, Cylindrophis, Python, and Tropidophis by conventional and molecular cytogenetic methods. Despite the fact that these species have similar karyotypes in terms of chromosome number and morphology, we detected variability in the distribution of heterochromatin, telomeric repeats, and rDNA loci. Heterochromatic blocks were mainly detected in the centromeric regions in all species, although accumulations were detected in pericentromeric and telomeric regions in a few macrochromosomes in several of the studied species. All species show the expected topology of telomeric repeats at the edge of all chromosomes, with the exception of Eryx muelleri, where additional accumulations were detected in the centromeres of three pairs of macrochromosomes. The rDNA loci accumulate in one pair of microchromosomes in all Eryx species and in Cylindrophis ruffus, in one macrochromosome pair in Tropidophis melanurus and in two pairs of microchromosomes in Python regius. Sex-specific differences were not detected, suggesting that these species likely have homomorphic, poorly differentiated sex chromosomes.<\/jats:p>","DOI":"10.3390\/genes13071185","type":"journal-article","created":{"date-parts":[[2022,7,2]],"date-time":"2022-07-02T11:12:35Z","timestamp":1656760355000},"page":"1185","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Cytogenetic Analysis of the Members of the Snake Genera Cylindrophis, Eryx, Python, and Tropidophis"],"prefix":"10.3390","volume":"13","author":[{"given":"Tom\u00e1\u0161","family":"Charv\u00e1t","sequence":"first","affiliation":[{"name":"Department of Ecology, Faculty of Science, Charles University, Vini\u010dn\u00e1 7, 12844 Prague, Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9171-5199","authenticated-orcid":false,"given":"Barbora","family":"Augstenov\u00e1","sequence":"additional","affiliation":[{"name":"Department of Ecology, Faculty of Science, Charles University, Vini\u010dn\u00e1 7, 12844 Prague, Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"Frynta","sequence":"additional","affiliation":[{"name":"Department of Zoology, Faculty of Science, Charles University, Vini\u010dn\u00e1 7, 12844 Prague, Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3515-729X","authenticated-orcid":false,"given":"Luk\u00e1\u0161","family":"Kratochv\u00edl","sequence":"additional","affiliation":[{"name":"Department of Ecology, Faculty of Science, Charles University, Vini\u010dn\u00e1 7, 12844 Prague, Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8429-5680","authenticated-orcid":false,"given":"Michail","family":"Rovatsos","sequence":"additional","affiliation":[{"name":"Department of Ecology, Faculty of Science, Charles University, Vini\u010dn\u00e1 7, 12844 Prague, Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,1]]},"reference":[{"key":"ref_1","unstructured":"Uetz, P., Freed, P., Aguilar, R., and Ho\u0161ek, J. 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