[Cloning and sequence analysis of the gene encoding the partial region CS protein of a Plasmodium falciparum isolate from Yunnan].
OBJECTIVE
Determining nucleotide sequence of the circumsporozoite protein partial gene of the Plasmodium falciparum PFD-3/YN (Yunnan of China) and finding out the differences of the CS gene sequence between Chinese Plasmodium falciparum isolate and other isolates.


METHODS
The circumsporozoite protein gene fragment was amplified by polymerase chain reaction and cloned into M13 bacteriophage. M13-CSP single strand DNAs of the three positive clones were extracted respectively. Then, the nucleotide sequence of the CS gene fragment was determined by the dideoxy chain termination method. PCGENE software was used to compare and analyze the CS gene sequence of the six isolates.


RESULTS
Different degrees of diversity of the CS gene sequences were found among P. falciparum PFD-3/YN and other isolates(T4, Wellcome, NF54, 3D7 and 7G8). A non-silent substitution at the nucleotide level being found in the P. f Th/Tc antigenic epitope region.


CONCLUSIONS
There were differences in the CS gene sequence among P. falciparum PFD-3/YN and those of other isolates.
Xiao
J
J
Institute of Tropical Medicine, First Military Medical University, Guangzhou 510515.
Li
M
M
Chui
D
D
Bi
H
H
Wang
P
P
Li
Y
Y
D000595:Amino Acid Sequence; D000818:Animals; D000953:Antigens, Protozoan / Q000235:genetics* / Q000302:isolation & purification; D016054:DNA, Protozoan / Q000235:genetics*; D017125:Genes, Protozoan; D006801:Humans; D016778:Malaria, Falciparum / Q000469:parasitology; D008969:Molecular Sequence Data; D010963:Plasmodium falciparum / Q000276:immunology* / Q000302:isolation & purification; D015800:Protozoan Proteins / Q000235:genetics* / Q000302:isolation & purification; D017422:Sequence Analysis, DNA; D017385:Sequence Homology
D000953:Antigens, Protozoan; D016054:DNA, Protozoan; D015800:Protozoan Proteins; C041595:circumsporozoite protein, Protozoan