title: [Dual gene amplification and selection system with dihydrofolate reductase and glutamine synthetase genes effectively increase the foreign gene expression].
abstract: BACKGROUND
  To study the effect of gene amplification and selection system with DHFR plus GS and DHFR or GS gene on the foreign gene expression.
  
  
  METHODS
  Using the N-terminal truncated hTPO(T184) gene as target gene, two plasmidsre were constructed: pDC- T184 and pGC-T184 where DHFR and GS gene were used respectively as the selective amplification marker. They were cotransfected into CHO dhfr cells to establish dual gene amplification and selection system of DHFR plus GS gen and respectively transfected to establish single gene amplification and selection system of DHFR or GS gene. Three selective methods in dual selective system to compare expression efficiency of hTPO were designed: the first method (DG) was to use drug pressure of MTX, then use MSX; the second method (GD) was reversed; the third method was simultaneously to use MTX and MSX as drug pressure.
  
  
  RESULTS
  DHFR+GS dual system had not only higher gene amplification efficiency but also higher level expression. There was no distinct affect in different method of drug pressure.
  
  
  CONCLUSIONS
  MTX plus MSX dual drug pressure in dual selection system was an efficient and simple method to increase the expression of foreign gene in mammalian cells.
authors: Xi'an Jiaotong University, Xi'an 710061, China.
authors: Zhiyun
authors: Z
authors: Wang
authors: Bo
authors: B
authors: Wei
authors: Shufang
authors: S
authors: Tian
authors: Yuqian
authors: Y
authors: Zhang
authors: Xiuping
authors: X
authors: Wang
authors: Yonglie
authors: Y
authors: Chu
authors: Li
authors: L
authors: Ruan
mesh_terms: D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D005784:Gene Amplification / Q000187:drug effects; D015870:Gene Expression; D005974:Glutamate-Ammonia Ligase / Q000235:genetics*; D008727:Methotrexate / Q000494:pharmacology; D010957:Plasmids / Q000235:genetics; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics*
chemical_list: D013762:Tetrahydrofolate Dehydrogenase; D005974:Glutamate-Ammonia Ligase; D008727:Methotrexate