Identification of putative sex chromosomes in the blue tilapia, Oreochromis aureus, through synaptonemal complex and FISH analysis
2012 | 2001
Campos-Ramos, Rafael | Harvey, Simon C | Masabanda, Julio | Carrasco, Luis A P | Griffin, Darren K | McAndrew, Brendan | Bromage, Niall R | Penman, David | University of Stirling | University of Stirling | Brunel University | University of Stirling | Brunel University | Institute of Aquaculture | University of Stirling | Institute of Aquaculture | 0000-0001-7384-5133 | 0000-0001-8608-6631
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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