Identification of putative sex chromosomes in the blue tilapia, Oreochromis aureus, through synaptonemal complex and FISH analysis |
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| Authors: | R. Campos-Ramos S.C. Harvey J.S. Masabanda L.A.P. Carrasco D.K. Griffin B.J. McAndrew N.R. Bromage D.J. Penman |
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| Affiliation: | (1) Institute of Aquaculture, University of Stirling, Stirling, FK9 4LA, Scotland;(2) Department of Biological Sciences, Brunel University, Uxbridge, Middlesex, UB8 3PH, UK;(3) Present address: Acuicultura y Nutrición de Galicia, Acuinuga, S.L., Parque Empresarial A Picaraña, nave 6D, E-15980 Padrón, A Coruña, Galicia, España |
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| Abstract: | Sex determination in the blue tilapia, Oreochromis aureus, is primarily a ZW female-ZZ male system. Here, by analysis of the pachytene meiotic chromosomes of O. aureus, we demonstrate the presence of two distinct regions of restricted pairing present only in heterogametic fish. The first, a subterminal region of the largest bivalent is located near to the region of unpairing found in the closely related species O. niloticus, while the second is in a small bivalent, most of which was unpaired. These results suggest that O. aureus has two separate pairs of sex chromosomes. |
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| Keywords: | blue tilapia FISH Oreochromis aureus sex chromosomes sex ratio synaptonemal complex |
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