Publication Date:
2012-04-17
Description:
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. Content Type Journal Article Pages 1065-1072 DOI 10.1007/s10709-011-9610-0 Authors Marcelo de Bello Cioffi, Departamento de Genética e Evolução, Universidade Federal de São Carlos, São Carlos, SP, Brazil Antonio Sánchez, Departamento de Biología Experimental, Facultad de Ciencias Experimentales, Universidad de Jaén, Jaén, Spain Juan Alberto Marchal, Departamento de Biología Experimental, Facultad de Ciencias Experimentales, Universidad de Jaén, Jaén, Spain Nadezda Kosyakova, Institute of Human Genetics, Jena University Hospital, Kollegiengasse 10, 07743 Jena, Germany Thomas Liehr, Institute of Human Genetics, Jena University Hospital, Kollegiengasse 10, 07743 Jena, Germany Vladimir Trifonov, Institute of Chemical Biology and Fundamental Medicine, SB RAS, Novosibirsk, Russia Luiz Antonio Carlos Bertollo, Departamento de Genética e Evolução, Universidade Federal de São Carlos, São Carlos, SP, Brazil Journal Genetica Online ISSN 1573-6857 Print ISSN 0016-6707 Journal Volume Volume 139 Journal Issue Volume 139, Number 8
Print ISSN:
0016-6707
Electronic ISSN:
1573-6857
Topics:
Biology
