title: Potential contributions of heat shock proteins and related genes in sexual differentiation in yellow catfish (Pelteobagrus fulvidraco).
abstract: Sex determination and differentiation in ectotherms are very complicated affairs and usually affected by both genetic and environmental factors. Because of their temperature-sensitive expression, heat shock proteins (HSPs) are good candidates for temperature-dependent sex determination (TSD). Similar to most thermosensitive fish species, the male to female ratio increases with temperature in yellow catfish (Pelteobagrus fulvidraco). Yellow catfish is also a type of sexual size dimorphic fish, and the male individuals grow much faster than females of the same age. Therefore, research of sex differentiation in yellow catfish is important in aquiculture. In this attempt, a total of seven HSPs and related genes were identified from transcriptomes of yellow catfish by 454 pyrosequencing and Solexa sequencing that we did previously, including five genes with complete open reading frame (ORF). Phylogenetically, all these genes were compared with their counterparts from other vertebrates. All these genes were sex-biased expressed in gonads. Hspa5, Hip, and Cdc37 were expressed more highly in ovary than in testis, whereas Hsp90α, Hspb2, Hspb8, and Hspbp1 were expressed more highly in testis than in ovary. Additionally, the expression of these genes was assessed after 17α-methyltestosterone (MT) and 17α-ethinylestradiol (EE2) treatment, respectively. Our result showed that working as co-chaperones, these HSPs and related genes may regulate sex steroid receptor activities to influence gonad development in yellow catfish. Our work would help in the understanding of the mechanism of sexual differentiation in teleosts.
authors.affiliation: College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China. heyan@mail.hzau.edu.cn.
authors.forename: Yan
authors.initials: Y
authors.lastname: He
authors.affiliation: College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Fang
authors.affiliation: College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China.
authors.forename: Liyao
authors.initials: L
authors.lastname: Xue
authors.affiliation: College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Wu
authors.affiliation: College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China.
authors.forename: Farman Ullah
authors.initials: FU
authors.lastname: Dawar
authors.affiliation: College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China. jmei@mail.hzau.edu.cn.
authors.forename: Jie
authors.initials: J
authors.lastname: Mei
mesh_terms: D000818:Animals; D002397:Catfishes / Q000235:genetics* / Q000502:physiology; D004997:Ethinyl Estradiol / Q000494:pharmacology; D005260:Female; D029941:Fish Proteins / Q000235:genetics*; D006360:Heat-Shock Proteins / Q000235:genetics*; D008297:Male; D008777:Methyltestosterone / Q000494:pharmacology; D010053:Ovary / Q000187:drug effects / Q000378:metabolism; D010802:Phylogeny; D012733:Sex Differentiation / Q000235:genetics*; D013737:Testis / Q000187:drug effects / Q000378:metabolism
chemical_list: D029941:Fish Proteins; D006360:Heat-Shock Proteins; D004997:Ethinyl Estradiol; D008777:Methyltestosterone
keywords: Heat shock proteins; Pelteobagrus fulvidraco; Sex differentiation; Sex steroid