title: [Construction of nonsense-mutated eukaryotic expression vector of factor IX gene and its expression in COS-7 cells].
abstract: The purpose of this study was to construct 4 types of nonsense-mutated eukaryotic expression plasmids of fIX gene, using pcDNA3.1 plasmid containing fIX cDNA as template, and to identify, then to perform their expression in COS-7 cells. These stop mutants constructed by site-directed mutagenesis based on PCR, and further confirmed by DNA sequencing. COS-7 cells were transfected with either the wild-type or mutated fIX expression constructs, then the relative expression levels of fIX mRNA were detected by real time fluorescent quantitative PCR. The result showed that except the designed sites, there were no other nucleotide mutation in the sequences of four nonsense mutants. The results of real time PCR proved that the nonsense-mutated vectors can be effectively expressed in COS-7 cells. It is concluded that the nonsense-mutated eukaryotic expression vectors of fIX gene have been successfully constructed and can express in COS-7 cells, which provides the material basis for further researches on mechanism and treatment of FIX deficiency and the function defects caused by nonsense mutation.
authors.affiliation: Department of Hematology, The Second Hospital, Shanxi Medical University, Taiyuan 030001, Shanxi Province, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Nie
authors.forename: Lin-Hua
authors.initials: LH
authors.lastname: Yang
authors.forename: Bao-Feng
authors.initials: BF
authors.lastname: Chai
authors.forename: Quan
authors.initials: Q
authors.lastname: Shen
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yao-Fang
authors.initials: YF
authors.lastname: Zhang
authors.forename: Jian-Fang
authors.initials: JF
authors.lastname: Chen
mesh_terms: D000818:Animals; D001483:Base Sequence; D019556:COS Cells; D002522:Chlorocebus aethiops; D003001:Cloning, Molecular; D018389:Codon, Nonsense / Q000235:genetics*; D005164:Factor IX / Q000235:genetics*; D005822:Genetic Vectors; D014162:Transfection
chemical_list: D018389:Codon, Nonsense; D005164:Factor IX