[Construction of rapid tagging vector of genes in Giardia lamblia].
OBJECTIVE
To construct a recombinant vector for rapid gene tagging in Giardia lamblia.


METHODS
To obtain the recombinant vector pGL gdh-Neo with the Neo selection marker, the Neo gene was put under the control of gdh promoter by overlap PCR and inserted into pGEM-5zf. A DNA fragment containing multiple cloning sites (MCS) followed by triple hemagglutinin(3HA) coding sequences was synthesized and cloned into the pGL gdh-Neo to construct a recombinant vector pGL MCS-3HA-gdh-Neo. Giardia H2A gene was selected as a tagging gene to validate the effectivity of the recombinant vector pGL MCS-3HA-gdh-Neo. The histone H2A coding sequence was amplified by PCR, digested with EcoR I and Spe I, and inserted into MCS of pGL MCS-3HA-gdh-Neo. The resulting plasmid was then linearized and transfected into Giardia trophozoites. The H2A recombinant strain selected by G418 was analyzed by PCR,Western blotting and immunofluorescence.


RESULTS
A rapid tagging recombinant vector with multiple cloning sites and triple hemagglutinin (3HA) was constructed with a length of 4 260 bp. The H2A recombinant vector was transfected into Giardia trophozoites and integrate into the Giardia genome at the correct locus. The HA-tagged H2A protein was expressed with a molecular weight (Mr) of 16 900.


CONCLUSIONS
A rapid tagging recombinant vector of genes in Giardia lamblia, pGL MCS-3HA-gdh-Neo, has been constructed.
Medical School, Dalian Uninversity, Dalian 116622, China.
Hong-Mei
HM
Ju
Yi-Hui
YH
Wang
Xia
X
Zhang
Yun-Hua
YH
Wang
Ya-Jie
YJ
Li
D003001:Cloning, Molecular; D015870:Gene Expression; D005822:Genetic Vectors; D016829:Giardia lamblia / Q000235:genetics*; D010957:Plasmids; D014162:Transfection