title: [Study of in vitro expression of human platelet ITGB3 gene nonsense mutation c.1476G>A].
abstract: OBJECTIVE
  To explore the function of a novel nonsense mutation c.1476G>A of ITGB3 gene using an in vitro expression system.
  
  
  METHODS
  An eukaryotic expression vector containing ITGB3 c.1476G>A cDNA was generated by site-directed mutagenesis and transformed into E.coli. Plasmid DNA was extracted and sequenced to confirm the target mutations. Wild-type and mutant recombination plasmids were transfected into Chinese hamster ovarian cancer (CHO) cells by nonliposome method, and the stable expression cells were harvested by G418 screening. The ITGB3 gene mRNA transcription and GPIIIa expression level in CHO cells were detected with real-time quantitative PCR, Western blotting and flow cytometry, respectively.
  
  
  RESULTS
  The eukaryotic expression vectors of wild ITGB3 cDNA and c.1476G>A mutant were successfully constructed. CHO cells with stable expression were obtained after transfection and screening. Compared with the wild-type transfected cells, the amount of CD61 antigen expression was 37% and mRNA transcription level was only 6% in the mutant-transfected cells. Full length GPIIIa protein was found only in the stably wild-type-transfected cells, but not in mutant-transfected cells by Western blotting analysis.
  
  
  CONCLUSIONS
  The ITGB3 c.1476G>A mutation can decrease the transcription level and further affect GPIIIa synthesis and CD61 antigen expression.
authors.affiliation: Blood Center of Zhejiang Province, Key Laboratory of Blood Safety Research of Ministry of Health, Hangzhou, Zhejiang 310006, China. zfm00@hotmail.com.
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Xianguo
authors.initials: X
authors.lastname: Xu
authors.forename: Shu
authors.initials: S
authors.lastname: Chen
authors.forename: Xiaozhen
authors.initials: X
authors.lastname: Hong
authors.forename: Sudan
authors.initials: S
authors.lastname: Tao
authors.forename: Ji
authors.initials: J
authors.lastname: He
authors.forename: Faming
authors.initials: F
authors.lastname: Zhu
authors.forename: Hangjun
authors.initials: H
authors.lastname: Lyu
mesh_terms: D000818:Animals; D001483:Base Sequence; D001792:Blood Platelets / Q000166:cytology / Q000378:metabolism*; D016466:CHO Cells; D003001:Cloning, Molecular; D018389:Codon, Nonsense / Q000235:genetics*; D006224:Cricetinae; D003412:Cricetulus; D006801:Humans; D039661:Integrin beta3 / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics / Q000378:metabolism; D017354:Point Mutation
chemical_list: D018389:Codon, Nonsense; C061248:ITGB3 protein, human; D039661:Integrin beta3