Hepatitis B Virus Surface Antigen Variants Clustered Within Immune Epitopes in Chronic Hepatitis B Carriers from Hormozgan Province, South of Iran

Norouzi, Mehdi and Ghorashi, Seyed Ali and Ataei, Behrooz and Yaran, Majid and Malekzadeh, Reza and Alavian, Seyed Moayyed and Judaki, Mohammad Ali and Ghamari, Shiva and Namazi, Alireza and Rahimnia, Ramin and Khedive, Abolfazl and Jazayeri, Seyed Mohammad (2010) Hepatitis B Virus Surface Antigen Variants Clustered Within Immune Epitopes in Chronic Hepatitis B Carriers from Hormozgan Province, South of Iran. Iranian Journal of Basic Medical Sciences, 13 (4). pp. 213-224.

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Abstract

Objective(s) The aim of this study was to characterize the hepatitis B virus surface protein genotypes and sequence variations among hepatitis B virus surface antigen (HBsAg) positive chronic patients in Hormozgan province, south of Iran. Materials and Methods A total of 8 patients enrolled in this study. The surface gene was amplified and directly sequenced. Genotypes and nucleotide/amino acid substitutions were identified compared to the sequences obtained from the database. Results All strains belonged to genotype D. Overall 77 “mutations” occurred at 45 nucleotide positions, of them, 44 (57.14) were silent (no amino acid altering) and 33 (42.86) were missense (amino acid changing). A number of 24 (80) out of 30 amino acid changes occurred in different immune epitopes within surface protein, of which, 9 (30) in B cell epitopes in 7 residues (2 occurred in “a” determinant region); 8 (42.1) in T helper epitopes in 7 residues and 7 (10) in 4 residues inside CTL epitopes. Conclusion Hepatitis B virus genome containing mutated immune epitopes no longer could be recognized by specific T- cells of the host immune surveillance and did not enhance anti-HBs production. This could led to the progression of chronicity of hepatitis B virus infection.

Item Type: Article
Subjects: QW Microbiology and Immunology
Divisions: Journals > Iranian J Basic Medical Sciences
Depositing User: ijbms ijbms
Date Deposited: 18 Dec 2017 17:52
Last Modified: 18 Dec 2017 17:52
URI: http://eprints.mums.ac.ir/id/eprint/8771

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