אסיף מאגר המחקר החקלאי

Genetics of sex determination in tilapiine species

Year:

2008

Source of publication :

Authors :

Volume :

2

Co-Authors:

Cnaani, A., Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute, State University, Blacksburg, VA, United States
Lee, B.-Y., Department of Biology, University of Maryland, College Park, MD, United States
Zilberman, N., Institute of Animal Science, Volcani Center, Agricultural Research Organization, Bet Dagan, Israel
Ozouf-Costaz, C., Département Systématique et Evolution, Museum National d'Histoire Naturelle, Paris, France
Hulata, G., Institute of Animal Science, Volcani Center, Agricultural Research Organization, Bet Dagan, Israel
Ron, M., Institute of Animal Science, Volcani Center, Agricultural Research Organization, Bet Dagan, Israel
D'Hont, A., CIRAD-Persyst, Aquaculture et Gestion des Resources Aquatiques, Montpellier, France
Baroiller, J.-F., CIRAD-Persyst, Aquaculture et Gestion des Resources Aquatiques, Montpellier, France
D'Cotta, H., CIRAD-Persyst, Aquaculture et Gestion des Resources Aquatiques, Montpellier, France
Penman, D.J., Institute of Aquaculture, University of Stirling, Stirling, United Kingdom
Tomasino, E., Department of Food Science and Technology, Cornell University, Ithaca, NY, United States
Coutanceau, J.-P., Département Systématique et Evolution, Museum National d'Histoire Naturelle, Paris, France
Pepey, E., CIRAD-Persyst, Aquaculture et Gestion des Resources Aquatiques, Montpellier, France
Shirak, A., Institute of Animal Science, Volcani Center, Agricultural Research Organization, Bet Dagan, Israel
Kocher, T.D., Department of Biology, University of Maryland, College Park, MD, United States, Department of Biology, 1210 Biology/Psychology Building, University of Maryland, College Park, MD 20742, United States

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Abstract:

We identified DNA markers linked to sex determining genes in six closely related species of tilapiine fishes. The mode of sex determination differed among species. In Oreochromis karongae and Tilapia mariae the sex-determining locus is on linkage group (LG) 3 and the female is heterogametic (WZ-ZZ system). In O. niloticus and T. zillii the sex-determining locus is on LG1 and the male is heterogametic (XX-XY system). A more complex pattern was observed in O. aureus and O. mossambicus, in which markers on both LG1 and LG3 were associated with sex. We found evidence for sex-linked lethal effects on LG1, as well as interactions between loci in the two linkage groups. Comparison of genetic and physical maps demonstrated a broad region of recombination suppression harboring the sex-determining locus on LG3. Sex-specific recombination suppression was found in the female heterogametic sex. Sequence analysis showed the accumulation of repetitive elements in this region. Phylogenetic analysis suggests that at least two transitions in the mode of sex determination have occurred in this clade. This variation in sex determination mechanisms among closely related species makes tilapias an excellent model system for studying the evolution of sex chromosomes in vertebrates. Copyright © 2008 S. Karger AG.

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