In silico analysis, seasonal variation and gonadotropic regulation of jag1 and its receptor notch1 in testis of spotted snakehead Channa punctatus.

Abstract:

:The present study in seasonally breeding spotted snakehead Channa punctatus, for the first time in nonmammalian vertebrates, demonstrated correlation between reproductive phase-dependent testicular expression of ligand Jag1/receptor Notch1 and spermatogenic events. Testicular transcriptome sequencing data from our earlier study in C. punctatus was used in the present study to select the best transcript for jag1 (cpjag1) and notch1 (cpnotch1). The transcripts cpjag1 and cpnotch1 encoded full-length putative proteins of 1215 (cpJag1) and 2475 (cpNotch1) amino acids, respectively. A marked homology in the extracellular domains of Jag1 and Notch1 was observed following their alignment with respective proteins from different vertebrates, suggesting conservation in ligand-receptor interaction in C. punctatus. Both cpJag1 and cpNotch1 showed phylogenetic closeness with their teleostean counterparts, especially with that of Perciformes. Temporal expression of cpjag1 and cpnotch1 in testis depending on reproductive phases showed an appreciably high expression during spermatogenically inactive resting and postspawning phases when seminiferous lobules consisted of spermatogonial stem cells and undifferentiated spermatogonia. Their expression sharply declined during spermatogenically active preparatory and spawning phases. It appears that involvement of cpjag1/cpnotch1 is restricted to inactive phases when spermatogonial stem cells renew themselves and replenish undifferentiated spermatogonia. This assumption is ascertained by an experimental study in which high level of testicular cpjag1/cpnotch1 expression in control fish of resting phase markedly decreased after administration of human chorionic gonadotropin that is known to induce proliferation and differentiation of spermatogonia and spawning of spermatozoa.

journal_name

Gen Comp Endocrinol

authors

Roy A,Basak R,Rai U

doi

10.1016/j.ygcen.2018.05.014

subject

Has Abstract

pub_date

2018-09-15 00:00:00

pages

166-177

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(18)30038-8

journal_volume

266

pub_type

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