Positive Diversifying Selection on the <i>Plasmodium falciparum</i> <i>surf<sub>4.1</sub></i> Gene in Thailand
Tropical Medicine and Health
;
: 79-87, 2012.
Article
in English
| WPRIM
| ID: wpr-374037
ABSTRACT
<i>Plasmodium falciparum</i> SURFIN<sub>4.1</sub> is a type I transmembrane protein thought to locate on the merozoite surface and to be responsible for a reversible adherence to the erythrocyte before invasion. In this study, we evaluated <i>surf<sub>4.1</sub></i> gene segment encoding extracellular region for polymorphism, the signature of positive selection, the degree of linkage disequilibrium, and temporal change in allele frequency distribution in <i>P. falciparum</i> isolates from Thailand in 1988–89, 2003, and 2005. We found that SURFIN<sub>4.1</sub> is highly polymorphic, particularly at the C-terminal side of the variable region located just before a predicted transmembrane region. A signature of positive diversifying selection on the variable region was detected by multiple tests and, to a lesser extent, on conserved N-terminally located cysteine-rich domain by Tajima’s <i>D</i> test. Linkage disequilibrium between sites over a long distance (> 1.5 kb) was detected, and multiple SURFIN<sub>4.1</sub> haplotype sequences detected in 1988/89 still circulated in 2003. Few of the single amino acid polymorphism allele frequency distributions were significantly different between the 1988/89 and 2003 groups, suggesting that the frequency distribution of SURFIN<sub>4.1</sub> extracellular region remained stable over 14 years.
Full text:
Available
Index:
WPRIM (Western Pacific)
Type of study:
Prognostic study
Language:
English
Journal:
Tropical Medicine and Health
Year:
2012
Type:
Article
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