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Do sex chromosomes of snakes, monitor lizards, and iguanian lizards result from multiple fission of an “ancestral amniote super-sex chromosome”?

Singchat, Worapong, Sillapaprayoon, Siwapech, Muangmai, Narongrit, Baicharoen, Sudarath, Indananda, Chantra, Duengkae, Prateep, Peyachoknagul, Surin, O’Connor, Rebecca, Griffin, Darren K., Srikulnath, Kornsorn and others. (2020) Do sex chromosomes of snakes, monitor lizards, and iguanian lizards result from multiple fission of an “ancestral amniote super-sex chromosome”? Chromosome Research, . ISSN 0967-3849. (doi:10.1007/s10577-020-09631-4) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:81299)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
https://doi.org/10.1007/s10577-020-09631-4

Abstract

Sex chromosomes in some amniotes share linkage homologies with distantly related taxa in regions orthologous to squamate reptile chromosome 2 (SR2) and the snake W sex chromosome. Thus, the SR2 and W chromosomes may formerly have been part of a larger ancestral amniote super-sex chromosome. Comparison of various sex chromosomal linkage homologies in Toxicofera with those in other amniotes offers an excellent model to assess key cytological differences, to understand the mechanisms of amniote sex chromosome evolution in each lineage and the existence of an ancestral amniote super-sex chromosome. Chromosome maps of four species of Toxicofera were constructed using bacterial artificial chromosomes (BACs) derived from chicken and zebra finch libraries containing amniote sex chromosomal linkages. Different macrochromosome linkage homologies were highly conserved among Toxicofera, and at least two BACs (CH261-125F1 and CH261-40D6) showed partial homology with sex chromosomes of amniotes associated with SR2, which supports the hypothesis of an ancestral super-sex chromosome with overlaps of partial linkage homologies. The present data also suggest a possible multiple fission mechanism of an ancestral super-sex chromosome, which resulted in further development of various sex chromosomal linkages of Toxicofera based on particular properties that favored the role of sex chromosomes.

Item Type: Article
DOI/Identification number: 10.1007/s10577-020-09631-4
Uncontrolled keywords: Chromosome map, Toxicofera, BAC, Fission, Super-sex chromosome
Divisions: Divisions > Division of Natural Sciences > School of Biosciences
Depositing User: Susan Davies
Date Deposited: 18 May 2020 13:21 UTC
Last Modified: 18 May 2020 13:22 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/81299 (The current URI for this page, for reference purposes)
O’Connor, Rebecca: https://orcid.org/0000-0002-4270-970X
Griffin, Darren K.: https://orcid.org/0000-0001-7595-3226
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