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doi:10.1534/genetics.106.059014
A more recent version of this article appeared on October 1, 2006.
REGULAR RESEARCH PAPERS |
A genetic linkage map of the hermaphrodite teleost fish Sparus aurata L
Rafaella Franch 1, Bruno Louro 2, Matina Tsalavouta 3, Dimitris Chatziplis 4, Costas S Tsigenopoulos 3, Elena Sarropoulou 3, Jenny Antonello 1, Andonis Magoulas 3, Tomaso Patarnello 1, Costantinos C Mylonas 3, Massimiliano Babbucci 1, Deborah M Power 2, Giorgos Kotoulas 3 and Luca Bargelloni 1*
1 University of Padova
2 Universidade do Algarve
3 Hellenic Center for Marine Research
4 Aristotle University of Thessaloniki
* To whom correspondence should be addressed. E-mail: luca.bargelloni{at}unipd.it.
Submitted on April 12, 2006
Revised on June 2, 2006
Accepted on 7 August 2006
The gilthead sea bream (Sparus aurata L.) is a marine fish of great importance for fisheries and aquaculture. It has also a peculiar sex-determination system, being a protandrous hermaphrodite. Here we report the construction of a first-generation genetic linkage map for S. aurata, based on 204 microsatellite markers. Twenty-six linkage groups (LG) were found. The total map length was 1241.9 cM. The ratio between sex-specific map lengths was 1:1.2 (male: female). Comparison with a preliminary radiation hybrid (RH) map reveals a good concordance, as all markers located in a single LG are located in a single RH group, except for Ad-25 and CId-31. Comparison with the Tetraodon nigroviridis genome revealed a considerable number of evolutionary conserved regions (ECRs) between the two species. The mean size of ECRs was 182 bp (sequence identity 60-90%). Forty-one ECRs have a known chromosomal location in the pufferfish genome. Despite the limited number of anchoring points, significant syntenic relationships were found. The linkage map presented here provides a robust comparative framework for QTL analysis in S. aurata and is s step towards the identification of genetic loci involved both in the determination of economically important traits and in the individual timing of sex reversal.
Key Words: Sparidae, aquaculture, comparative genomics, linkage map, sex determination
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