Abstract
To investigate the geographical divergence of delta virus RNA sequences, 868 nucleotides (nt), including the delta antigen-coding region, were determined in isolates from two Japanese patients, M and S, by polymerase chain reaction and direct sequencing and compared with three previously reported nucleotide sequences. The sequence obtained for hepatitis delta virus RNA from patient M was approximately 92% identical to sequences previously obtained for two other strains of hepatitis delta virus, whereas the sequence of hepatitis delta virus RNA obtained from patient S was approximately 81% identical to the previously sequenced strains. This suggests that delta agent in Japan has a heterogeneous origin and the delta virus RNA sequence from Japanese patient S is the most divergent delta virus isolate yet analyzed. To study the evolution rate of delta virus RNA, viral isolates obtained 3 and 4 years apart from each of two patients were also sequenced. It was estimated that the substitution rate of viral RNA was 0.57 x 10(-3) nt per site per year in patient M and 0.64 x 10(-3) nt per site per year in patient S for the delta antigen gene.
MeSH Terms
Amino Acid Sequence
Antigens, Viral/genetics
Base Sequence
Biological Evolution
Genes, Viral
Hepatitis D/microbiology
Hepatitis Delta Virus/genetics
Hepatitis delta Antigens
Humans
Molecular Sequence Data
Oligonucleotides
Polymerase Chain Reaction
RNA, Viral/genetics
Time Factors
Viral Structural Proteins/genetics
Chemicals
Antigens, Viral
Hepatitis delta Antigens
Oligonucleotides
RNA, Viral
Viral Structural Proteins
hepatitis delta virus large antigen
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Imazeki F
First Department of Medicine, Chiba University School of Medicine, Japan.
Omata M
Ohto M
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