Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sex Chromosome Differentiation in the Frog Genus Pseudis Involves Satellite DNA and Chromosome Rearrangements

Full text
Author(s):
Gatto, Kaleb P. [1] ; Mattos, V, Joao ; Seger, Karin R. [2] ; Lourenco, Luciana B. [2]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, Inst Biol, Dept Struct & Funct Biol, Lab Chromosome Studies, Campinas, SP - Brazil
[2] Mattos, Joao, V, Univ Estadual Campinas, Inst Biol, Dept Struct & Funct Biol, Lab Chromosome Studies, Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: FRONTIERS IN GENETICS; v. 9, AUG 7 2018.
Web of Science Citations: 3
Abstract

The genus Pseudis comprises six frogs of the family Hylidae and only P. tocantins had heteromorphic sex chromosomes detected by classical cytogenetics. In this species, the W chromosome is larger than the Z chromosome and has a large heterochromatic block located between the centromere and the nucleolus organizer region (NOR) in the long arm. This large heterochromatic band is enriched for the PcP190 satellite DNA (satDNA), whereas the Z chromosome bears a smaller C-band adjacent to the centromere in the long arm that is not detected by PcP190 probes. To assess sex chromosome differentiation in the genus Pseudis, we investigated the PcP190 satDNA in P. bolbodactyla, P. cardosoi, P. minuta, and P. paradoxa and in one species of Lysapsus, which is the sister genus of Pseudis. PcP190 sequences were isolated, sequenced, and the diversity of this class of satDNA was analyzed. To evaluate whether sex-related variations in PcP190 satDNA were present, we used in situ hybridization (for P. bolbodactyla, P. paradoxa, P. cardosoi, and P. minuta) and Southern blotting analysis (for all species). We found a low level of sex chromosome heteromorphism in P. bolbodactyla, as a PcP190 cluster was detected in the short arm of one of the homologs of pair 7 exclusively in females. In P. paradoxa, P. minuta, and P. cardosoi, PcP190 satDNA is not sex-related, although a cluster of PcP190 sequences could be recognized in the NOR-bearing chromosomes 7 of P. paradoxa and P. minuta and their homologous chromosome 5 of P. cardosoi. By tracking cytogenetic data in a species tree, we may hypothesize that the positioning of the PcP190 site adjacently to the NOR (as observed in the long arm of the W chromosome of P. tocantins) is a derived condition with respect to the location of the PcP190 site apart from the NOR, in the short arm of the NOR-bearing chromosomes 7 (as present in P. bolbodactyla, P. paradoxa, and P. minuta) or 5 (as present in P. cardosol) and we discuss about the emergence of PcP190 satDNA as a sex-related trait. (AU)

FAPESP's process: 14/23542-6 - Comparative molecular cytogenetics of anurans of the genus Pseudis with emphasis on the study of sex chromosomes
Grantee:Luciana Bolsoni Lourenço
Support Opportunities: Regular Research Grants