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.
Henning
F
F
Department of Genetics and Evolutionary Biology, University of São Paulo, São Paulo, Brasil.
Trifonov
V
V
Ferguson-Smith
M A
MA
de Almeida-Toledo
L F
LF
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