Cytogenetics of the skinks (Reptilia, Scincidae) from Thailand; IV: newly investigated karyotypic features of<i>Lygosoma quadrupes</i>and<i>Scincella melanosticta</i>

Patawang, Isara; Chuaynkern, Yodchaiy; Supanuam, Praween; Maneechot, Nuntiya; Pinthong, Krit; Tanomtong, Alongklod

doi:10.1080/00087114.2017.1402249

Cited by 16 publications

(15 citation statements)

References 8 publications

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“…This figure includes only those lizard families where sex chromosomes have been identified cytogenetically. Adopted from [ 6 , 62 , 107 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 ] and references therein.…”

Section: Figurementioning

confidence: 99%

Did Lizards Follow Unique Pathways in Sex Chromosome Evolution?

Alam

Sarre

Gleeson

et al. 2018

Genes

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Reptiles show remarkable diversity in modes of reproduction and sex determination, including high variation in the morphology of sex chromosomes, ranging from homomorphic to highly heteromorphic. Additionally, the co-existence of genotypic sex determination (GSD) and temperature-dependent sex determination (TSD) within and among sister clades makes this group an attractive model to study and understand the evolution of sex chromosomes. This is particularly so with Lizards (Order Squamata) which, among reptiles, show extraordinary morphological diversity. They also show no particular pattern of sex chromosome degeneration of the kind observed in mammals, birds and or even in snakes. We therefore speculate that sex determination sensu sex chromosome evolution is labile and rapid and largely follows independent trajectories within lizards. Here, we review the current knowledge on the evolution of sex chromosomes in lizards and discuss how sex chromosome evolution within that group differs from other amniote taxa, facilitating unique evolutionary pathways.

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Section: Figurementioning

confidence: 99%

Did Lizards Follow Unique Pathways in Sex Chromosome Evolution?

Alam

Sarre

Gleeson

et al. 2018

Genes

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“…Hedin et al [22], based on the analysis of synaptonemal complexes, concluded that the X 1 X 1 X 2 X 2 /X 1 X 2 Y is derived from XX/XY by fusion of the Y chromosome with a macrochromosome. On the other hand, heteromorphic ZZ/ZW sex chromosomes were reported in the congeneric Scincella melanosticta from Thailand [23], representing the only reported case of female heterogamety in skinks.…”

Section: Introductionmentioning

confidence: 98%

Cytogenetically Elusive Sex Chromosomes in Scincoidean Lizards

Kostmann

Augstenová

Frynta

et al. 2021

IJMS

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The lizards of the species-rich clade Scincoidea including cordylids, gerrhosaurids, skinks, and xantusiids, show an almost cosmopolitan geographical distribution and a remarkable ecological and morphological divergence. However, previous studies revealed limited variability in cytogenetic traits. The sex determination mode was revealed only in a handful of gerrhosaurid, skink, and xantusiid species, which demonstrated either ZZ/ZW or XX/XY sex chromosomes. In this study, we explored the karyotypes of six species of skinks, two species of cordylids, and one gerrhosaurid. We applied conventional and molecular cytogenetic methods, including C-banding, fluorescence in situ hybridization with probes specific for telomeric motifs and rDNA loci, and comparative genomic hybridization. The diploid chromosome numbers are rather conserved among these species, but the chromosome morphology, the presence of interstitial telomeric sequences, and the topology of rDNA loci vary significantly. Notably, XX/XY sex chromosomes were identified only in Tiliqua scincoides, where, in contrast to the X chromosome, the Y chromosome lacks accumulations of rDNA loci. We confirm that within the lizards of the scincoidean clade, sex chromosomes remained in a generally poor stage of differentiation.

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“…Among lizards, despite evidence of homology of sex-linked chromosomal regions among some species [ 35 , 36 , 37 , 38 , 39 ], sex chromosomes display extraordinary variation in morphology. Within the family Scincidae, XY heterogamety is prevalent, however, the recent discovery of a skink with ZW heterogamety [ 40 ] highlights at least one transition between these systems. In addition, heteromorphic and homomorphic sex chromosomes are broadly distributed throughout skinks [ 41 , 42 , 43 ] and skink species with sex chromosomes also exhibit temperature sensitivity of sex determination [ 35 , 44 , 45 , 46 , 47 , 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

Differences in Homomorphic Sex Chromosomes Are Associated with Population Divergence in Sex Determination in Carinascincus ocellatus (Scincidae: Lygosominae)

Hill

Shams

Burridge

et al. 2021

Cells

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Sex determination directs development as male or female in sexually reproducing organisms. Evolutionary transitions in sex determination have occurred frequently, suggesting simple mechanisms behind the transitions, yet their detail remains elusive. Here we explore the links between mechanisms of transitions in sex determination and sex chromosome evolution at both recent and deeper temporal scales (<1 Myr; ~79 Myr). We studied a rare example of a species with intraspecific variation in sex determination, Carinascincus ocellatus, and a relative, Liopholis whitii, using c-banding and mapping of repeat motifs and a custom Y chromosome probe set to identify the sex chromosomes. We identified both unique and conserved regions of the Y chromosome among C. ocellatus populations differing in sex determination. There was no evidence for homology of sex chromosomes between C. ocellatus and L. whitii, suggesting independent evolutionary origins. We discuss sex chromosome homology between members of the subfamily Lygosominae and propose links between sex chromosome evolution, sex determination transitions, and karyotype evolution.

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Cytogenetics of the skinks (Reptilia, Scincidae) from Thailand; IV: newly investigated karyotypic features ofLygosoma quadrupesandScincella melanosticta

Cited by 16 publications

References 8 publications

Did Lizards Follow Unique Pathways in Sex Chromosome Evolution?

Did Lizards Follow Unique Pathways in Sex Chromosome Evolution?

Cytogenetically Elusive Sex Chromosomes in Scincoidean Lizards

Differences in Homomorphic Sex Chromosomes Are Associated with Population Divergence in Sex Determination in Carinascincus ocellatus (Scincidae: Lygosominae)

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