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Objective: To construct and apply a replacement targeting vector for mouse coagulation factor IX(mFIX) gene in embryonic stem (ES) cells. Methods: Based on the cloning and structural analysis of the genomic DNA fragment of coagulation factor IX gene from 129Sv mouse genomic DNA A phage library, PMFIXDEL plasmid was designed with positive-negative-selection (PNS) strategy, and constructed with commonmolecular cloning techniques. Structure of PMFIXDEL was identified by PCR and restriction analysis. Afterelectroporation with the linearized PMFIXDEL DNA, transfected ES cells were cultured in G418/GANC drugselection medium. The recombination efficacy of this vector was tested. Results: The main components ofPMFIXDEL were two copies of negative selection gene (HSV-tk expression cassette), a positive selectiongene (Neo expression cassette), long and short homologous fragments and plasmid backbone. The introduction of negative selection gene (HSV-tk ) into the construct resulted in 24-fold increase of selection.Conclusion: An effective replacement vector for mFIX gene targeting was constructed and applied in ES cell.
Objective: To construct and apply a replacement targeting vector for mouse coagulation factor IX (mFIX) gene in embryonic stem (ES) cells. Methods: Based on the cloning and structural analysis of the genomic DNA fragment of coagulation factor IX gene from 129Sv mouse genomic DNA A phage library, PMFIXDEL plasmid was designed with positive-negative-selection (PNS) strategy, and constructed with common molecular cloning techniques. Structure of PMFIXDEL was identified by PCR and restriction analysis. Afterelectroporation with the linearized PMFIXDEL DNA, transfected ES cells were cultured in G418 / GANC drugselection medium. The recombination efficacy of this vector was tested. Results: The main components of PMFIXDEL were two copies of the negative selection gene (HSV-tk expression cassette), a positive selection gene (Neo expression cassette), long and short homologous fragments and plasmid backbone. The introduction of negative selection gene (HSV-tk) into the construct resulted in 24-fold inc rease of selection. Confc: An effective replacement vector for mFIX gene targeting was constructed and applied in ES cell.