title: Modification of pGH cDNA using the first intron and adenovirus-mediated expression in CHO cells.
abstract: OBJECTIVE
  This study was conducted to investigate the function of the first intron of porcine growth hormone (pGH) gene in the gene expression.
  
  
  METHODS
  PCR method was used to amplify the first intron from pig genomic DNA. The intron was then inserted into pGH cDNA to construct pGH cDNA-intron (pGH cDNA-in). The recombinant adenoviruses containing pGH cDNA and pGH cDNA-in genes under control of CMV promoter were generated by homologous recombination method in HEK 293 cells respectively. The effect of the first intron on gene expression was evaluated by comparing the expression levels of pGH cDNA-in and pGH cDNA mediated by adenovirus vectors in CHO cells.
  
  
  RESULTS
  The expression level of pGH cDNA containing the first intron increased by 117%, which was significantly higher than that of pGH cDNA without the intron (P < 0.001).
  
  
  CONCLUSIONS
  The first intron of pGH gene has the function to improve pGH gene expression.
authors.affiliation: Department of Biotechnology, Yanshan University, Qinhuangdao 066004, China.
authors.forename: Xiujin
authors.initials: X
authors.lastname: Li
authors.forename: Fei
authors.initials: F
authors.lastname: Zhong
authors.forename: Shunzhang
authors.initials: S
authors.lastname: Qi
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D004251:DNA Transposable Elements; D018076:DNA, Complementary; D004274:DNA, Recombinant; D005822:Genetic Vectors; D013006:Growth Hormone / Q000235:genetics*; D007438:Introns; D013552:Swine
chemical_list: D004251:DNA Transposable Elements; D018076:DNA, Complementary; D004274:DNA, Recombinant; D013006:Growth Hormone