title: Cloning and expression of StAR during gonadal cycle and hCG-induced oocyte maturation of air-breathing catfish, Clarias gariepinus.
abstract: Complementary DNAs encoding steroidogenic acute regulatory protein (StAR) have been isolated from different fish species, yet the relevance of StAR during gonadal cycle and more importantly in final oocyte maturation has not been assessed so far. A cDNA encoding StAR was isolated from the ovarian follicles of air-breathing catfish, Clarias gariepinus. Catfish StAR exhibited 55 to 72% identity at nucleotide level with other vertebrate orthologs. RT-PCR analysis of tissue distribution pattern demonstrated the presence of StAR mRNA in various tissues including gonads, kidney, liver, brain and intestine of catfish. Real-time RT-PCR analysis revealed high expression of StAR mRNA in the pre-spawning phase of ovary while it was low in preparatory, spawning and regressed phases. In testis, maximum expression was noticed during the preparatory phase. During human chorionic gonadotropin (hCG)-induced oocyte maturation, both in vitro and in vivo, StAR mRNA levels were augmented by 2 h and then declined gradually to reach basal levels by 12 h as that of saline-treated controls. Taken together, high level of expression during hCG-induced oocyte maturation vis-à-vis in spawning suggests a role for StAR, in addition to the steroidogenic enzyme genes in final oocyte maturation.
authors.affiliation: Department of Animal Sciences, School of Life Sciences, University of Hyderabad, P. O. Central University, Gachibowli, Hyderabad 500 046, Andhra Pradesh, India.
authors.forename: G
authors.initials: G
authors.lastname: Sreenivasulu
authors.forename: P
authors.initials: P
authors.lastname: Sridevi
authors.forename: P K
authors.initials: PK
authors.lastname: Sahoo
authors.forename: I
authors.initials: I
authors.lastname: Swapna
authors.forename: W
authors.initials: W
authors.lastname: Ge
authors.forename: R
authors.initials: R
authors.lastname: Kirubagaran
authors.forename: A
authors.initials: A
authors.lastname: Dutta-Gupta
authors.forename: B
authors.initials: B
authors.lastname: Senthilkumaran
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002397:Catfishes / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D006063:Chorionic Gonadotropin / Q000494:pharmacology*; D003001:Cloning, Molecular; D019143:Evolution, Molecular; D005260:Female; D029941:Fish Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects*; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009865:Oocytes / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism*; D010053:Ovary / Q000378:metabolism; D010750:Phosphoproteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013737:Testis / Q000378:metabolism; D000098682:Steroidogenic Acute Regulatory Protein
chemical_list: D006063:Chorionic Gonadotropin; D029941:Fish Proteins; D010750:Phosphoproteins; D012333:RNA, Messenger; D000098682:Steroidogenic Acute Regulatory Protein