Germ cells during gonadal sex differentiation in the teleost |
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| Authors: | T Kobayashi H Kajiura-Kobayashi Y Nagahama |
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| Institution: | 1. Laboratory of Reproductive Biology, National Institute for Basic Biology, Okazaki, 444-8585, Japan
2. CREST, Kawaguchi, 332-0012, Japan
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| Abstract: | We reported previously that two isoforms of vasa mRNA and protein are present in tilapia (Kobayashi et al. 2002). One (vas-s) lacks a part of the N-terminal region found in the other isoform (vas). Both isoforms are expressed in oocytes through the embryonic stages when PGCs localize in the lateral plate mesoderm. After PGCs localized in the gonadal anlagen, vas-s expression increased and vas expression became undetectable. Expression of both isoforms was observed again after morphological gonadal sex differentiation, irrespective of genotypic sexes. These changes are in accordance with sex differences in number of gonial germ cells during this period, suggesting that molecular sexual dimorphism occurs in germ cells between both sexes during this period. |
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