Publications & Reports

TNF Block Gene Variants Associated with Pain Intensity in Black Southern Africans with HIV-associated Sensory Neuropathy.

Hendry LM, Wadley AL, Cherry CL, Price P, Lombard Z, Kamerman PR
*Brain Function Research Group, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa daggerDivision of Human Genetics, School of Pathology, Faculty of Health Sciences, National Health Laboratory Se

Abstract

OBJECTIVES: HIV-associated sensory neuropathy (HIV-SN) is a common neurological complication of HIV infection, and often is painful. Tumour necrosis factor (TNF)-alpha is implicated in neuropathic pain, but associations between neuropathic pain and polymorphisms in the TNFA gene have not been identified. The “TNF block” is a region of high linkage disequilibrium within the central major histocompatability complex that contains several genes involved in the regulation of inflammation, including TNFA. Polymorphisms in the block have been associated with altered risk of HIV-SN, but no investigations into whether this region is associated with the painful symptoms of neuropathy have been undertaken. Therefore, we investigated whether polymorphisms in the TNF block are associated with pain intensity in black Southern Africans with HIV-SN. METHODS: Single nucleotide polymorphisms (SNPs) defining TNF block haplotypes and African-specific tagSNPs were genotyped in samples from 150 black Southern Africans with HIV-SN. RESULTS: One SNP allele, rs28445017A, was significantly associated with increased pain intensity after correction for age, sex and CD4 T-cell count. A common 3-SNP haplotype containing rs28445017G remained associated with reduced pain intensity after correction for covariates and multiple comparisons. DISCUSSION: We identified a novel genetic associations between polymorphisms in the TNF block and pain intensity in black Southern Africans with HIV-SN. Our study implicates rs28445017 in painful HIV-SN, although its precise role and whether it may be causative is unclear. rs28445017 was not associated with risk for HIV-SN as such, highlighting potential differences between the pathophysiology of the neuropathy and the painful features of the neuropathy.

Publication

  • Journal: The Clinical Journal of Pain
  • Published: 01/01/2016
  • Volume: 32
  • Issue: 1
  • Pagination: 45-50

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Health Issue

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