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Current Pharmacogenomics and Personalized Medicine


ISSN (Print): 1875-6921
ISSN (Online): 1875-6913

Evaluation of a Pharmacogenetic Test in Thailand for Abacavir Hypersensitivity Screening in Human Immunodeficiency Virus Infection

Author(s): Chonlaphat Sukasem, Montchai Gatrungsei, Somying Promso, Phillip Cunningham, Napatrupron Koomdee, Siwalee Santon, Montri Chamnanphon, Insee Sensorn and Wasun Chantratita

Volume 11, Issue 3, 2013

Page: [231 - 236] Pages: 6

DOI: 10.2174/18756921113119990005

Price: $65


Abacavir hypersensitivity reaction (ABC-HSR) is associated with the presence of HLA-B* 57:01 allele. Alternative tests for ABC-HSR associated allele determination are needed where sequence-based HLA typing is not available, particularly in resource-limited settings or developing countries. This study focused on the development and evaluation of two HLA-B* 57:01 tagging SNPs (single nucleotide polymorphism) HCP5 (HLA complex P5) rs2395029 and TNF (tumor necrosis factor) rs3093726 genotyping assays. Two hundred and thirteen purified genomic DNA samples were used to evaluate the performance characteristics of a HLA-B* 57:01 screening method based on allele-specific polymerase chain reaction (AS-PCR) with melting curve analysis. HCP5 rs2395029 and TNF rs3093726 were also genotyped using simple probe real-time PCR assay. All samples were successfully genotyped wherein AS-PCR genotyping provided 100% sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) when compared with specific HLA-B status by sequencing based assay. When comparing the AS-PCR screening method with the HCP5 rs2395029 and TNF rs3093726 genotyping method, the former had 100% sensitivity, 100% specificity, 100% PPV and 100% NPV using a simple probe; while the latter one had 95.24% sensitivity, 100% specificity, 100% PPV and 99.48% NPV, respectively. In conclusion, our study lends support on a molecular tool for pharmacogenetic screening in resource-limited settings. Thus, serious drug hypersensitivity associated with ABC may potentially be reduced in Thailand by further evaluation of the proposed assay in clinical practice.

Keywords: Abacavir hypersensitivity, HIV-1, HLA-B* 57:01, real-time PCR, simple probe, single nucleotide polymorphism (SNP), Thailand.

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