title: cDNA cloning and mRNA expression of heat shock protein 90 gene in the haemocytes of Zhikong scallop Chlamys farreri.
abstract: Heat shock protein 90 (HSP90) is a highly conserved molecular chaperone contributing to the folding, maintenance of structural integrity and proper regulation of a subset of cytosolic proteins. The full-length cDNA of Zhikong scallop Chlamys farreri HSP90 (designated CfHSP90) was cloned by EST and rapid RACE techniques. It was of 2710 bp, including an open reading frame (ORF) of 2181 bp encoding a polypeptide of 726 amino acids with all the five HSP90 family signatures. BLAST analysis revealed that the CfHSP90 gene shared high similarity with other known HSP90 genes. Fluorescent real-time quantitative RT-PCR was used to examine the expression pattern of CfHSP90 mRNA in haemocytes of scallops exposed to Cd2+, Pb2+ and Cu2+ for 10 and 20 days, respectively. All the three heavy metals could induce CfHSP90 expression. There was a clear dose-dependent expression pattern of CfHSP90 after heavy metals exposure for 10 days or 20 days. Different concentrations of the same metal resulted in different effects on CfHSP90 expression. The results indicated that CfHSP90 responded to various heavy metal stresses with a dose-dependent expression pattern as well as exposure time effect, and could be used as a molecular biomarker in a heavy metal polluted environment.
authors.affiliation: Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Rd., Qingdao 266071, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.forename: Linsheng
authors.initials: L
authors.lastname: Song
authors.forename: Duojiao
authors.initials: D
authors.lastname: Ni
authors.forename: Longtao
authors.initials: L
authors.lastname: Wu
authors.forename: Huan
authors.initials: H
authors.lastname: Zhang
authors.forename: Yaqing
authors.initials: Y
authors.lastname: Chang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015415:Biomarkers; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000302:isolation & purification; D004784:Environmental Monitoring / Q000379:methods*; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000187:drug effects; D018841:HSP90 Heat-Shock Proteins / Q000235:genetics* / Q000378:metabolism; D006434:Hemocytes / Q000378:metabolism*; D019216:Metals, Heavy / Q000494:pharmacology; D008969:Molecular Sequence Data; D049897:Pectinidae / Q000235:genetics* / Q000378:metabolism; D010802:Phylogeny; D012333:RNA, Messenger / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D014877:Water Pollution, Chemical / Q000032:analysis
chemical_list: D015415:Biomarkers; D018076:DNA, Complementary; D018841:HSP90 Heat-Shock Proteins; D019216:Metals, Heavy; D012333:RNA, Messenger