Molecular characterization of hepatitis B virus X gene in HIV-positive South Africans

Maemu P. Gededzha, Tsakani H. Sondlane, Lesibana A. Malinga, Rosemary J. Burnett, Ramokone L. Lebelo, Jason T. Blackard, M. Jeffrey Mphahlele, Selokela G. Selabe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Hepatitis B virus (HBV) infection is a major public health problem worldwide and the major cause of hepatocellular carcinoma (HCC) in South Africa. The role of HBV in HCC is not well understood, although the HBV X gene has been implicated as a critical factor. Data on the HBV X gene in HIV-positive South Africans are limited; thus, we investigated X gene variability in 24 HIV-infected treatment-naïve patients at Dr George Mukhari Academic Hospital. Quantitative and qualitative HBV DNA tests were conducted using real-time and in-house polymerase chain reaction (PCR) assays, respectively, targeting the complete HBV X gene. In-house PCR-positive samples were cloned using the P-Gem T-easy vector System II and sequenced. By phylogenetic analysis, X gene sequences were classified as subgenotype A1 (n = 15), A2 (n = 4), and D1 (n = 4), and one dual infection with subgenotypes as A1 and C. The basal core promoter mutations T1753C, A1762T, and G1764A were identified in the majority of sequences. Genotype D sequences had a 6-nucleotide insertion. In conclusion, subgenotype A1 was predominant, and a rare dual infection of HBV genotype A and C was detected. The 6-nucleotide insertion could represent a unique variant in the region and highlights the need for functional studies of HBV X gene variants, particularly from resource-limited settings.

Original languageEnglish
Pages (from-to)190-198
Number of pages9
JournalVirus Genes
Issue number2
Publication statusPublished - 1 Apr 2018


  • Africa
  • Genotype
  • HBx
  • HIV
  • Hepatitis B virus (HBV)
  • South Africa


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