The Amazonian Red Side-Necked Turtle Rhinemys rufipes (Spix, 1824) (Testudines, Chelidae) Has a GSD Sex-Determining Mechanism with an Ancient XY Sex Microchromosome System.
Cells
; 9(9)2020 09 12.
Article
en En
| MEDLINE
| ID: mdl-32932633
ABSTRACT
The Amazonian red side-necked turtle Rhynemis rufipes is an endemic Amazonian Chelidae species that occurs in small streams throughout Colombia and Brazil river basins. Little is known about various biological aspects of this species, including its sex determination strategies. Among chelids, the greatest karyotype diversity is found in the Neotropical species, with several 2n configurations, including cases of triploidy. Here, we investigate the karyotype of Rhinemys rufipes by applying combined conventional and molecular cytogenetic procedures. This allowed us to discover a genetic sex-determining mechanism that shares an ancestral micro XY sex chromosome system. This ancient micro XY system recruited distinct repeat motifs before it diverged from several South America and Australasian species. We propose that such a system dates back to the earliest lineages of the chelid species before the split of South America and Australasian lineages.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Tortugas
/
Cromosoma X
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Cromosoma Y
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Evolución Molecular
/
Procesos de Determinación del Sexo
Límite:
Animals
Idioma:
En
Revista:
Cells
Año:
2020
Tipo del documento:
Article
País de afiliación:
Brasil