Non-homologous sex chromosomes in two species of the genus Eigenmannia (Teleostei: Gymnotiformes).
The Neotropical genus Eigenmannia is a fish group with unknown species diversity where representatives possess a broad range of chromosomal sex determining systems namely XY/XX, X(1)X(2)Y/X(1)X(1)X(2)X(2), ZZ/ZW as well as homomorphic sex chromosomes. To test the homology of two heteromorphic XY sex chromosome systems present in two sympatric populations, reciprocal cross-species FISH experiments were performed using probes derived by microdissection of X and Y chromosomes present in analyzed specimens of Eigenmannia virescens and Eigenmannia sp.2, respectively. While X and Y paint probes hybridized to species-specific sex chromosomes, in reciprocal cross-FISH both probes hybridized exclusively to autosomes. The result suggests multiple independent origins of the XY systems in the analyzed populations.
Department of Genetics and Evolutionary Biology, University of São Paulo, São Paulo, Brasil.
F
F
Henning
V
V
Trifonov
M A
MA
Ferguson-Smith
L F
LF
de Almeida-Toledo
D000818:Animals; D001483:Base Sequence; D003582:Cytogenetics; D017931:DNA Primers / Q000235:genetics; D005260:Female; D023702:Gymnotiformes / Q000145:classification / Q000235:genetics*; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008297:Male; D016133:Polymerase Chain Reaction; D012730:Sex Chromosomes / Q000235:genetics*; D013045:Species Specificity
D017931:DNA Primers