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Title: 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
Authors: Ezaz, Tariq Tariq
Viana, Patrik Ferreira
Feldberg, Eliana
Cioffi, Marcelo B.
Carvalho, Vinícius Tadeu de
Menezes, Sabrina
Vogt, Richard Carl
Liehr, Thomas
Keywords: Chelidae
comparative genome hybridization
genetic sex determination
Neotropical Region
Issue Date: 2020
metadata.dc.publisher.journal: Cells
metadata.dc.relation.ispartof: Volume 9, Número 9
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.
metadata.dc.identifier.doi: 10.3390/cells9092088
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