Abstract:
:Amazonian puffing snakes (Spilotes; Colubridae) are snakes widely distributed in the Neotropical region. However, chromosomal data are scarce in this group and, when available, are only limited to karyotype description using conventional staining. In this paper, we focused on the process of karyotype evolution and trends for sex chromosomes in two Amazonian Puffer Snakes (S.pulllatus and S.sulphureus). We performed an extensive karyotype characterization using conventional and molecular cytogenetic approaches. The karyotype of S.sulphureus (presented here for the first time) exhibits a 2n = 36, similar to that previously described in S.pullatus. Both species have highly differentiated ZZ/ZW sex chromosomes, where the W chromosome is highly heterochromatic in S.pullatus but euchromatic in S.sulphureus. Both W chromosomes are homologous between these species as revealed by cross-species comparative genomic hybridization, even with heterogeneous distributions of several repetitive sequences across their genomes, including on the Z and on the W chromosomes. Our study provides evidence that W chromosomes in these two species have shared ancestry.
journal_name
Genes (Basel)journal_title
Genesauthors
Viana PF,Ezaz T,de Bello Cioffi M,Jackson Almeida B,Feldberg Edoi
10.3390/genes10040288subject
Has Abstractpub_date
2019-04-09 00:00:00issue
4issn
2073-4425pii
genes10040288journal_volume
10pub_type
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