Abstract
In tilapia species, plasma lipoproteins with high electrophoretic mobility function in intra- and intergender communication. Blood samples taken at onset and peak of daily sexual activity from dominant and subordinate Oreochromis niloticus males and females were fractionated by native gel electrophoresis and the fast-migrating proteins were subjected to mass spectrometry. Mining the sequence data of the Cichlid Genome Consortium, we identified 11 proteins from the lipocalin super-family and characterized their genes' structures. Phylogenetic and structural analyses subdivided these genes into two classes: (I) 3-coding-exon apolipoproteins and (II) more complex 6-coding-exon sulfide-bond-containing lipocalins. Five apolipoproteins and PTGDSL1, TBTBP, and MSP proteins were modulated by gender and sexual behavior. PTGDSL1 protein was only observed in the plasma serum of dominant males. However, the cysteine residue in the position that is crucial for synthetase activity in mammalian prostaglandin D synthetases was not conserved in PTGDSL1 or PTGDSL2 proteins. In line with previous reports suggesting their involvement in male functions as pheromone transporters, TBTBP and MSP proteins were not detected in females at the onset of da...Continue Reading
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Nov 5, 2014·Fish Physiology and Biochemistry·Osamu NakamuraShigeyuki Tsutsui
Dec 14, 2017·Fish Physiology and Biochemistry·Asmma Y AmmarAsmaa M Hassan
Aug 8, 2018·Heredity·Andrey ShirakEyal Seroussi