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Polymorphisms of the TAP 1 and 2 Gene May Influence Clinical Outcome of Primary Dengue Viral Infection
Author(s) -
Soundravally R.,
Hoti S. L.
Publication year - 2008
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1111/j.1365-3083.2008.02109.x
Subject(s) - dengue fever , genotype , biology , pathogenesis , virology , immunology , gene , genetics
Antigen peptides are actively transported across the endoplasmic reticulum by the transporters associated with antigen presentation (TAP). TAP genes polymorphism could influence the selection process that determines which antigen peptides play a role in the pathogenesis of dengue infection. The aim of this study was to investigate the association of TAP genes polymorphism in diverse pathogenesis of dengue infection. This study included 197 dengue‐infected patients who were further categorized into 64, 23 and 11 primary dengue fever (DF), dengue hemorrhagic fever (DHF), dengue shock syndrome (DSS) cases, respectively and 26, 52, and 21 secondary DF, DHF and DSS cases, respectively as per WHO grading system. TAP1 and 2 gene polymorphisms were performed by the amplification refractory mutation system‐polymerase chain reaction (ARMS‐PCR). Analysis of TAP1 gene polymorphism demonstrated decreased frequency of Ile/Ile genotype at TAP1 333 in primary DHF cases (39.1%) when compared with primary DF (64.1%, P < 0.034, OR = 0.611).The genotype frequency of Val/Val at TAP2 379 locus was significantly decreased among primary DHF (43.5%) in comparison to primary DF (71.9%, P = 0.015, OR = 0.605). Significant low proportion of primary DSS were found to have TAP1 637 Asp/Asp genotypes (54.5%) when compared with primary DF (70.3%, P = 0.043). Asp/Asp genotype at TAP1 637 was found to reduce the risk by 0.643 times for primary DSS. There was no significant difference in the genotypes studied between primary and secondary infection and also within secondary dengue infection in all three clinical groups. This report on TAP gene polymorphisms in dengue suggested that among the primary‐infected individuals, homozygous patterns for Ile at TAP1 333 Val at TAP2 379 loci and Asp at TAP1 637 were found to be a protective factor against development of DHF and DSS, respectively.