title: Measuring allelic heterogeneity in Plasmodium falciparum by a heteroduplex tracking assay.
abstract: We developed a novel Plasmodium falciparum genotyping strategy based on the heteroduplex tracking assay (HTA) method commonly used to genotype viruses. Because it can detect both sequence and size polymorphisms, we hypothesized that HTA is more sensitive than current methods. To test this hypothesis, we compared the ability of HTA and a nested polymerase chain reaction (PCR) to detect genetic diversity in 17 Thai samples. The HTA detected more MSP1 sequence variants in eight isolates (47%), less sequence variants in three isolates (18%), and an equal number of sequence variants in six isolates (35%), suggesting that HTA is equal to or more sensitive than the nested PCR. This study is a proof of concept that HTA is a sensitive allelic discrimination method able to determine genetic diversity in P. falciparum and warrants its use in studies of antimalarial drug efficacy.
authors.affiliation: Department of Clinical Microscopy, Faculty of Medical Technology, Mahidol University, Bangkok, Thailand.
authors.forename: Warunee
authors.initials: W
authors.lastname: Ngrenngarmlert
authors.forename: Jesse J
authors.initials: JJ
authors.lastname: Kwiek
authors.forename: Deborah D
authors.initials: DD
authors.lastname: Kamwendo
authors.forename: Kimberly
authors.initials: K
authors.lastname: Ritola
authors.forename: Ronald
authors.initials: R
authors.lastname: Swanstrom
authors.forename: Chansuda
authors.initials: C
authors.lastname: Wongsrichanalai
authors.forename: R Scott
authors.initials: RS
authors.lastname: Miller
authors.forename: Wanida
authors.initials: W
authors.lastname: Ittarat
authors.forename: Steven R
authors.initials: SR
authors.lastname: Meshnick
mesh_terms: D000483:Alleles; D000818:Animals; D001483:Base Sequence; D016054:DNA, Protozoan; D018740:Genetic Heterogeneity; D008969:Molecular Sequence Data; D009692:Nucleic Acid Heteroduplexes; D010963:Plasmodium falciparum / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid
chemical_list: D016054:DNA, Protozoan; D009692:Nucleic Acid Heteroduplexes