Evolution of sex hormone binding globulins reveals early gene duplication at the root of vertebrates - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles General and Comparative Endocrinology Year : 2021

Evolution of sex hormone binding globulins reveals early gene duplication at the root of vertebrates

Abstract

Sex hormone-binding globulin (Shbg) is an important vertebrate blood carrier protein synthetized in the liver and involved in the transport and local regulation of sex steroids in target tissues. A novel shbg gene (shbgb) with a predominant ovarian expression was recently characterized. Being initially found only in salmonids, this shbgb was originally thought to result from the Salmonid-specific whole genome duplication. Using updated transcriptomic and genomic resources we identified Shbgb orthologs in non-salmonid teleosts (European eel, arowana), holosteans (spotted gar, bowfin), polypteriformes (reedfish), agnatha (sea lamprey) and in amphibians, and found that the classical Shbg gene (Shbga) displays a predominant hepatic expression whereas Shbgb has a predominant gonadal expression. Together, these results indicate that these two Shgb genes most likely originate from a whole genome duplication event at the root of vertebrate evolution, followed by numerous and independent losses and by tissue expression specialization of Shbga and Shbgb paralogs.
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hal-02987822 , version 1 (07-11-2022)

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Yann Guiguen, Jérémy Pasquier, Alexis Fostier, Julien Bobe. Evolution of sex hormone binding globulins reveals early gene duplication at the root of vertebrates. General and Comparative Endocrinology, 2021, 300, pp.1-8. ⟨10.1016/j.ygcen.2020.113646⟩. ⟨hal-02987822⟩
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