Molecular cloning and expression analysis of Fshr and Lhr in relation to Fshb and Lhb subunits during the period of temperature-dependent sex determination in pejerrey Odontesthes bonariensis.

Abstract:

:In this study, we cloned and characterized the follicle stimulating hormone receptor (Fshr) and luteinizing hormone receptor (Lhr) cDNAs of pejerrey Odontesthes bonariensis, a species with temperature-dependent sex determination (TSD), and analyzed their expression in relation to Fshb and Lhb subunits during gonadogenesis at temperatures producing only females (17 degrees C, FPT), both sexes (25 degrees C, MixPT), and only males (29 degrees C, MPT). The pejerrey Fshr cDNA had 3,069 bp for a mature protein of 694 amino acids (aa) and a signal peptide of 22 aa; the Lhr cDNA had 2,936 bp for a mature protein of 676 aa and a signal peptide of 25 aa. With the exception of Lhr in fish at the MPT, all genes showed significant increases and/or peaks of expression before histological differentiation of the gonads regardless of temperature. Larvae at the FPT had lower Fshb and Lhb but higher Lhr expression during the TSD period than those at the MPT; a clear pattern could not be ascertained for Fshr. At the MixPT, Fshb, Lhb, and Lhr mRNA increased in approximately half of the fish during TSD and sex differentiation and the sex ratio was 55.2% male. Based on the above results, it is suggested that animals with high Fshb and Lhb and low Lhr values represent putative males. These evidences, together with other studies, suggest that temperature may signal through the pituitary (differential expression of Fshb and Lhb) down to the gonads (differential expression of Lhr), probably affecting the regulation of steroidogenesis during the TSD process of pejerrey.

journal_name

Mol Reprod Dev

authors

Shinoda T,Miranda LA,Okuma K,Hattori RS,Fernandino JI,Yoshizaki G,Somoza GM,Strüssmann CA

doi

10.1002/mrd.21179

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

521-32

issue

6

eissn

1040-452X

issn

1098-2795

journal_volume

77

pub_type

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