Mthiyane, Thuli, Millard, James ORCID: 0000-0001-6427-552X, Adamson, John, Balakrishna, Yusentha, Connolly, Cathy, Owen, Andrew ORCID: 0000-0002-9819-7651, Rustomjee, Roxana, Dheda, Keertan, McIlleron, Helen and Pym, Alexander S
(2020)
N-acetyltransferase 2 genotypes amongst Zulu Speaking South Africans and isoniazid/N-acetyl-isoniazid pharmacokinetics during anti-tuberculosis treatment.
Antimicrobial agents and chemotherapy.
There is a more recent version of this item available. |
Abstract
BACKGROUND:Distribution of N-acetyltransferase2 (NAT2) polymorphisms varies considerably among different ethnic groups. Information on NAT2 single-nucleotide polymorphisms in South African population is limited. We investigated NAT2 polymorphisms and their effect on isoniazid pharmacokinetics in Zulu black HIV-infected South Africans in Durban, South Africa. METHODS:HIV-infected participants with culture-confirmed pulmonary tuberculosis (TB) were enrolled from two unrelated studies. Culture-confirmed participants were genotyped for NAT2 polymorphisms 282C>T, 341T>C, 481C>T, 857G>A, 590G>A and 803A>G using Life Technologies pre-validated Taqman assays (Life Technologies, Paisley, UK). Participants underwent sampling for determination of plasma isoniazid and N-acetylisoniazid concentrations. RESULTS:Amongst the 120 patients, 63/120 (52.5%) were slow metabolisers (NAT2*5/*5), 43/120 (35.8%) had intermediate (NAT2*5/12), and 12/120 (11.7%) had rapid genotype (NAT2*4/*11, NAT2*11/12 and NAT2*12/12). NAT2 alleles in this study were *4, *5C, *5D, *5E, *5J, *5K, *5KA, *5T, *11A, *12A/12C and *12M. NAT2*5 was the most frequent allele (70.4%) followed by NAT2*12 (27.9%). 34/40 had both PK results and NAT2 genotyping results. The median area under the concentration-time-curve to infinity (AUC0- ∞) interquartile range (IQR) was 7.81 (5.87 - 16.83) μg/ml/hr and maximum concentration (Cmax) 3.14 μg/ml (2.42 - 4.36) μg/mL. Individual polymorphisms were not equally distributed, with some represented in small numbers. Genotype did not correlate with phenotype, rapid genotype showing higher AUC0-∞ than slow but not significant, p=0.43. CONCLUSION:There was high prevalence of slow followed by intermediate then rapid acetylator genotypes. The poor concordance between genotype and phenotype suggests that other factors or genetic loci influence INH metabolism, and warrants further investigation in this population.
Item Type: | Article |
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Depositing User: | Symplectic Admin |
Date Deposited: | 20 Feb 2020 11:20 |
Last Modified: | 19 Jan 2023 00:01 |
DOI: | 10.1128/aac.02376-19 |
Open Access URL: | https://aac-asm-org.liverpool.idm.oclc.org/content... |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3075882 |
Available Versions of this Item
- N-acetyltransferase 2 genotypes amongst Zulu Speaking South Africans and isoniazid/N-acetyl-isoniazid pharmacokinetics during anti-tuberculosis treatment. (deposited 20 Feb 2020 11:20) [Currently Displayed]