Conserved sex chromosomes and karyotype evolution in monitor lizards (Varanidae)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985904%3A_____%2F19%3A00511995" target="_blank" >RIV/67985904:_____/19:00511995 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/19:10395775

Result on the web

<a href="https://asep.lib.cas.cz/arl-cav/cs/csg/?repo=crepo1&key=43770151593" target="_blank" >https://asep.lib.cas.cz/arl-cav/cs/csg/?repo=crepo1&key=43770151593</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41437-018-0179-6" target="_blank" >10.1038/s41437-018-0179-6</a>

Result language

angličtina

Original language name

Conserved sex chromosomes and karyotype evolution in monitor lizards (Varanidae)

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10603 - Genetics and heredity (medical genetics to be 3)

Project

<a href="/en/project/GJ17-22141Y" target="_blank" >GJ17-22141Y: Evolution of sex chromosomes in toxicoferan reptiles</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Heredity

ISSN

0018-067X

e-ISSN

—

Volume of the periodical

123

Issue of the periodical within the volume

2

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

215-227

UT code for WoS article

000474747800011

EID of the result in the Scopus database

2-s2.0-85060539870