title: [Study on the expression stability of mutant alpha-1,2 fucosyltransferase gene 293C to T and 658C to T in eukaryotic cells].
abstract: OBJECTIVE
  To establish the eukaryotic cell expression system for the alpha-1,2 fucosyltransferase gene FUT1 293C to T and 658C to T mutations and explore the mechanism of FUT1 mutations resulting in the reduced expression of H antigen.
  
  
  METHODS
  Genomic DNAs were extracted from individuals with para-Bombay phenotype and full coding region of FUT1 was amplified. The amplification fragments were ligated with pcDNA3.1 plasmid to construct the recombinant expression vectors. The recombinant plasmids were transfected into the COS-7 cells using lipofectamine transfection reagent and stable expression screening was performed. FUT1 mRNA expression was determined by real-time quantitative PCR. The activity of enzyme was measured by high performance liquid chromatography. Expressed protein was identified by SDS-PAGE and Western blotting.
  
  
  RESULTS
  pcDNA3.1-FUT1 wildtype, pcDNA3.1-FUT1 293C to T and pcDNA3.1-FUT1 658C to T recombinant vectors were constructed, respectively. COS-7 cells with stable expression of FUT1 were obtained through recombinant plasmid transfection and screening with G418. The FUT1 mRNA level of transfected cells with 293C to T and 658C to T recombinant vectors reached 97.10% and 104.74% of the wildtype FUT1 transfected cell. A specific protein band with about 46 000 was confirmed in the transfected cell lysates by SDS-PAGE electrophoresis and Western blotting with 6×His Tag antibody. The wildtype FUT1 transfected cell lysates can catalyze the enzymatic reaction, while the enzyme activity of cell lysates from 293C to T and 658C to T were abolished.
  
  
  CONCLUSIONS
  The results suggested that the 293C to T and 658C to T mutations of FUT1 gene did not affect the RNA and protein expression levels, but the enzyme activity of cells with FUT1 mutations was significantly decreased which resulted in the reduced expressin of H antigen.
authors: Institute of Transfusion Medicine, Blood Center of Zhejiang Province, Hangzhou, Zhejiang, People's Republic of China. taosudan2@yahoo.com.cn
authors: Su-dan
authors: SD
authors: Tao
authors: Yan-min
authors: YM
authors: He
authors: Xiao-zhen
authors: XZ
authors: Hong
authors: Yan-ling
authors: YL
authors: Ying
authors: Fa-ming
authors: FM
authors: Zhu
authors: Hang-jun
authors: HJ
authors: Lv
authors: Li-xing
authors: LX
authors: Yan
mesh_terms: D000818:Animals; D019556:COS Cells; D002522:Chlorocebus aethiops; D005647:Fucosyltransferases / Q000235:genetics* / Q000378:metabolism*; D005786:Gene Expression Regulation; D005822:Genetic Vectors / Q000235:genetics; D050505:Mutant Proteins / Q000235:genetics* / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D000097631:Galactoside 2-alpha-L-fucosyltransferase
chemical_list: D005647:Fucosyltransferases; D050505:Mutant Proteins; D012333:RNA, Messenger; D000097631:Galactoside 2-alpha-L-fucosyltransferase