Identification of putative sex chromosomes in the blue tilapia, Oreochromis aureus, through synaptonemal complex and FISH analysis

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 subtermi...

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Bibliographic Details
Published in:Genetica 2001, Vol.111 (1-3), p.143-153
Main Authors: Campos-Ramos, R, Harvey, S C, Masabanda, J S, Carrasco, L A, Griffin, D K, McAndrew, B J, Bromage, N R, Penman, D J
Format: Article
Language:English
Subjects:
Animals
Aquaculture
Chromosomes
Female
Fish
In Situ Hybridization, Fluorescence
Male
Oreochromis aureus
Polymerase Chain Reaction
Sex Chromosomes
Synaptonemal Complex
Tilapia
Tilapia - genetics
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Summary: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.
ISSN:0016-6707
1573-6857
DOI:10.1023/a:1013707818534