Genetic sex determination in three closely related hydrothermal vent gastropods, including one species with intersex individuals.
J Evol Biol
; 37(7): 779-794, 2024 Jul 10.
Article
em En
| MEDLINE
| ID: mdl-38699972
ABSTRACT
Molluscs have undergone many transitions between separate sexes and hermaphroditism, which is of interest in studying the evolution of sex determination and differentiation. Here, we combined multi-locus genotypes obtained from restriction site-associated DNA (RAD) sequencing with anatomical observations of the gonads of three deep-sea hydrothermal vent gastropods of the genus Alviniconcha living in the southwest Pacific. We found that all three species (Alviniconcha boucheti, Alviniconcha strummeri, and Alviniconcha kojimai) share the same male-heterogametic XY sex-determination system but that the gonads of XX A. kojimai individuals are invaded by a variable proportion of male reproductive tissue. The identification of Y-specific RAD loci (found only in A. boucheti) and the phylogenetic analysis of three sex-linked loci shared by all species suggested that X-Y recombination has evolved differently within each species. This situation of three species showing variation in gonadal development around a common sex-determination system provides new insights into the reproductive mode of poorly known deep-sea species and opens up an opportunity to study the evolution of recombination suppression on sex chromosomes and its association with mixed or transitory sexual systems.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Filogenia
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Processos de Determinação Sexual
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Gastrópodes
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Fontes Hidrotermais
Limite:
Animals
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article