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    • Keywords


      Hepatitis B virus (HBV); hepatitis B surface antigen; genotype 𝐷; 𝑆 gene region; mutation.

    • Abstract


      The 𝑆 gene region of the hepatitis B virus (HBV) is responsible for the expression of surface antigens and includes the ‘a’-determinant region. Thus, mutation(s) in this region would afford HBV variants a distinct survival advantage, permitting the mutant virus to escape from the immune system. The aim of this study was to search for mutations of the 𝑆 gene region in different patient groups infected with genotype 𝐷 variants of HBV, and to analyse the biological significance of these mutations. Moreover, we investigated 𝑆 gene mutation inductance among family members. Forty HBV-DNA-positive patients were determined among 132 hepatitis B surface antigen (HbsAg) carriers by the first stage of seminested PCR. Genotypes and subtypes were established by sequencing of the amplified S gene regions. Variants were compared with original sequences of these serotypes, and mutations were identified. All variants were designated as genotype 𝐷 and subtype ayw3. Ten kinds of point mutations were identified within the 𝑆 region. The highest rates of mutation were found in chronic hepatitis patients and their family members. The amino acid mutations 125 (M → T) and 127 (T → P) were found on the first loop of ‘a’-determinant. The other consequence was mutation inductance in a family member. We found some mutations in the S gene region known to be stable and observed that some of these mutations affected 𝑆 gene expression.

    • Author Affiliations


      Mehmet Özaslan1 Ersan Özaslan2 Arzu Barsgan1 Mehmet Koruk3

      1. Department of Biology, University of Gaziantep, 27310/ Gaziantep, Turkey
      2. Department of Gastroenterology, Ankara Numune Education and Training Hospital, 06100 / Ankara, Turkey
      3. Department of Gastroenterology, University of Gaziantep, 27310/ Gaziantep, Turkey
    • Dates

  • Journal of Genetics | News

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      Posted on July 25, 2019

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