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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Whole chromosome painting reveals independent origin of sex chromosomes in closely related forms of a fish species

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Cioffi, Marcelo de Bello [1] ; Sanchez, Antonio [2] ; Alberto Marchal, Juan [2] ; Kosyakova, Nadezda [3] ; Liehr, Thomas [3] ; Trifonov, Vladimir [4] ; Carlos Bertollo, Luiz Antonio [1]
Total Authors: 7
[1] Univ Fed Sao Carlos, Dept Genet & Evolucao, Sao Carlos, SP - Brazil
[2] Univ Jaen, Dept Biol Expt, Fac Ciencias Expt, Jaen - Spain
[3] Jena Univ Hosp, Inst Human Genet, D-07743 Jena - Germany
[4] SB RAS, Inst Chem Biol & Fundamental Med, Novosibirsk - Russia
Total Affiliations: 4
Document type: Journal article
Source: Genetica; v. 139, n. 8, p. 1065-1072, AUG 2011.
Web of Science Citations: 17

The wolf fish Hoplias malabaricus includes well differentiated sex systems (XY and X(1)X(2)Y in karyomorphs B and D, respectively), a nascent XY pair (karyomorph C) and not recognized sex chromosomes (karyomorph A). We performed the evolutionary analysis of these sex chromosomes, using two X chromosome-specific probes derived by microdissection from the XY and X(1)X(2)Y sex systems. A putative-sex pair in karyomorph A was identified, from which the differentiated XY system was evolved, as well as the clearly evolutionary relationship between the nascent XY system and the origin of the multiple X(1)X(2)Y chromosomes. The lack of recognizable signals on the sex chromosomes after the reciprocal cross-FISH experiments highlighted that they evolved independently from non-homologous autosomal pairs. It is noteworthy that these distinct pathways occur inside the same nominal species, thus exposing the high plasticity of sex chromosome evolution in lower vertebrates. Possible mechanisms underlying this sex determination liability are also discussed. (AU)

FAPESP's process: 09/14881-3 - Chromosomal evolution in the Erythrinidae family: cytogenetic mapping of repetitive DNAs and microdissection of sex chromosomes
Grantee:Marcelo de Bello Cioffi
Support Opportunities: Scholarships in Brazil - Doctorate