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Molecular cloning of three cDNAs encoding different GnRHs in the brain of barfin flounder.

Abstract：

:To examine the reproductive endocrinology of a large pleuronectiform fish, barfin flounder, Verasper moseri, a promising candidate for aquaculture and resource enhancement in northern Japan due to its high commercial value, three gonadotropin-releasing hormones (GnRHs) in the brain was identified by isolation of their cDNAs. This species had three molecular forms of GnRH; salmon GnRH (sGnRH), chicken GnRH-II (cGnRH-II), and seabream GnRH (sbGnRH). Each GnRH cDNA encoded a signal peptide (SP), GnRH, and a GnRH-associated peptide (GAP), which was connected to GnRH by a Gly-Lys-Arg sequence. The sGnRH cDNA encoded an SP composed of 23 amino acids and a GAP composed of 54 amino acids. The cGnRH-II cDNA encoded an SP of 23 amino acids and a GAP of 49 amino acids. The sbGnRH cDNA encoded an SP of 26 amino acids and a GAP of 57 amino acids. In situ hybridization showed that the genes for sGnRH, cGnRH-II, and sbGnRH are expressed in the ventromedial olfactory bulbs and the terminal nerve ganglion, the midbrain tegmentum, and the preoptic area, respectively. These results indicate that sbGnRH neurons in the preoptic area are involved in gonadotropin secretion in barfin flounder.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Amano M,Takahashi A,Yamanome T,Okubo K,Aida K,Yamamori K

doi

10.1016/s0016-6480(02)00008-4

keywords:

subject

Has Abstract

pub_date

2002-05-01 00:00:00

pages

325-33

issue

3

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(02)00008-4

journal_volume

126

pub_type

杂志文章

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