Variability in the immunogenic preS region of Pakistani hepatitis B virus isolates
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This paper reports the genetic variability of hepatitis B virus in Pakistan population. The worldwide prevalence of hepatitis B virus is estimated to be around 350 million that causes significant mortality especially in developing countries like Pakistan. In this study, genetic diversity of HBV was checked by using preS domain of HBV. About seventy-five samples were selected for study. Among these samples nine samples showed positive results after PCR and gel analysis. These nine samples were named SBS001–SBS008. After gel purification these samples were ligated in T/A cloning vector and transformed with E. coli DH5α. After successful cloning and positive restriction analysis these samples were subjected to DNA sequencing. Sequencing results showed that eight samples (SBS002–SBS008) have a deletion of 33 nucleotides at N-terminal that is characteristics of genotype D while SBS001 belongs to genotype C. Silent mutations and amino acid changes were also searched in this highly variable region of genome. Based upon this study it was concluded that genotype D is the most common genotype in Pakistan.
KeywordsHepatitis B virus DNA T/A cloning vector E. coli DH5α preS domain
I am much indebted to the Dr Altaf Khan for his help during the sequencing. I also express my great gratitude to Dr Saadat and Faisal Basheer who helped me a lot in collecting the HBV samples.
- 9.Idrees M, Khan S, Riazuddin S. Common genotypes of hepatitis B virus. J Coll Physicians Surg Pak. 2004;14(6):344–7.Google Scholar
- 10.Malik IA, Anwar CM, Luqman M, Ahmed A, Sarfraz T, Qamar MA. The pattern of acute viral hepatitis in children. A study based on seroepidemiology and biochemical profile. J Pak Med Assoc. 1987;37(12):314–7.Google Scholar
- 11.Malik N, Butt T, Mansoor N, Khan TG, Akbar MS, Asl M. Percentage of hepatitis B and C among young adult males from interior Sindh. Pak Armed Forc Med J. 2008;58:260–6.Google Scholar
- 12.Manzoor SA, Malik I, Tariq WUZ. Hepatitis B related chronic liver diseases in Rawalpindi Islamabad. J Coll Physicians Surg Pak. 1997;7:43–6.Google Scholar
- 13.Noorali S, Hakim ST, McLean D, Kazmi SU, Bagasra O. Prevalence of hepatitis B virus genotype D in females in Karachi, Pakistan. J Infect Dev Ctries. 2008;2(5):373–8.Google Scholar
- 14.Repp R, Rhiel S, Heermann KH, Schaefer S, Keller C, Ndumbe P, Lampert F, Gerlich WH. Genotyping by multiplex polymerase chain reaction for detection of endemic hepatitis B virus transmission. J Clin Microbiol. 1993;31:1095–102.Google Scholar
- 19.World Health Organization. Hepatitis B fact sheet. Available from: http://www.who.int/mediacentre/factsheets/fs204/en/. Accessed on 27 May 2015.