Adult ; Female ; Genotype ; Hepacivirus ; classification ; genetics ; Humans ; Male ; Turkey

OBJECTIVETo investigate the relationship of hepatitis C virus (HCV) serotype with genotype.

METHODSThe serotypes of HCV in the serum of 104 patients with chronic hepatitis C from 14 cities in China for which HCV genotypes were available, were determined by ELISA using Murex HCV Serotyping 1-6 Assay.

RESULTSThe serotypes of 86 (82.69 percent) of the 104 serum specimens were determined, and HCV serotypes were determined for 91 strains. Overall the concordance between hepatitis C virus serotype and genotype was 62.1 percent, and the concordance of serotype, with genotypes 1, 2 and 3 were 69.4 percent, 51.2 percent and 70.0 percent, respectively. The false-negative rate and concordance of genotype 2b was lower (54.5 percent).

CONCLUSIONThe specificity of HCV serotyping was affected by HCV strains' genotype and sometimes HCV serotype was not in concordance with genotype.

Genotype ; Hepacivirus ; classification ; Hepatitis C, Chronic ; virology ; Humans ; Serotyping

China ; DNA, Viral ; blood ; Hepacivirus ; classification ; Hepatitis C ; diagnosis ; etiology ; therapy ; Humans ; RNA, Viral ; analysis

OBJECTIVEIn order to fully understand hepatitis c virus (HCV) genotype 3b, 1a, 2b and 6a infection in China, We built HCV 5'-noncoding region (5'-NCR) of different genotypes and subtypes.

METHODSThe classification HCV into variable genotypes (subtypes) was carried on by programs A, B and C A. Using a combination of three restriction endonuclease BHH' (BsrB I, Hae II, Hinf I) digestions at the same time. The distinct genotypes were classified into 5 groups: genotype 1 (1a, 1b), 6a, 2 (2a, 2b), genotype 3 (3a, 3b), genotype4 (4a). B. With regard to genotype 1, we could distinguish subtype 1a from 1b using BstU I digestion. C. Using restriction endonuclease Hae III, genotype 2a, 2b, 3b, 4a, 6a are differentiated respectively.

RESULTS(1) HCV genotype 1a, 1b, 2a, 2b, 3a, 3b, 4a, 6a are fully discriminated by comparison with the genotypes regular samples. (2) Of the 93 patients, HCV genotype distribution in China was 66.67% for 1b, 18.28% for 2a, 3.23% for 1b/2b, 3b, 2b respectively. 2.15% for 2a/2b, 1b/2a respectively. 1.08% for 1a.

CONCLUSIONThis research indicated that adoption of HCV 5'-NCR A B C restriction endonuclease digestions techniques, might be sensitive and efficient to detect HCV and discriminate HCV genotype (subtypes) 1a to 6a.

5' Untranslated Regions ; chemistry ; DNA Restriction Enzymes ; Genotype ; Hepacivirus ; classification ; genetics ; RNA, Viral ; analysis

BACKGROUND: There are several serological subtypes (serotypes) of hepatitis C virus (HCV) which can be detected by a serological enzyme immunoassay (EIA) method which detects the HCV subtype-specific antibodies against the NS4 region of the virus. We determined the HCV serotypes chronic HCV infected patients in terms of clinical applications. METHODS: Subtypes based on Simmonds' classification were detected in chronic HCV patients serologically and viral loads quantitated with branched DNA (bDNA) assay. The EIA was compared with multiplex PCR method. RESULTS: The serotype 1 (Simmonds' classification, 1a, 1b, 1c), the most prevalent form in Korea followed by serotype 2 (Simmonds' classification, 2a, 2b, 2c). The distribution of serotypes and HCV viral loads were not different according to disease severity. The patients infected with serotype 1 had higher viremic level (serotype 1, 7.4+/-15.5 MEq/mL; serotype 2, 1.1+/-2.2 MEq/mL, P=0.017). The serotype matched with the genotype in 85.7% (18/21) of cases. CONCLUSIONS: HCV serotype 1 is the most prevalent form in Korea and seemed to be able to more actively replicate than serotype 2. Both multiplex PCR and EIA can be used for detecting HCV subtypes and mutually interpretable.
Antibodies ; Classification ; DNA ; Genotype ; Hepacivirus ; Humans ; Immunoenzyme Techniques ; Korea ; Multiplex Polymerase Chain Reaction ; RNA* ; Viral Load

OBJECTIVETo investigate the effect of hepatitis C virus (HCV) strain JFH1 on expression of the human gene, growth arrest and DNA damage-inducible gene 45 alpha (GADD45a), in infected hepatoma cells.

METHODSHCV JFH1 RNA-containing supernatants were used to infect the human hepatoma cell line, Huh7.5.1; infection was confirmed by Western blot detection of the HCV-encoded non-structural 5A (NS5A) protein and core protein. Infection-induced changes in GADD45a mRNA and protein expressions were measured by real time PCR using SYBR Green and Western blotting, respectively. Significance of differences between the levels detected in JFH1-infected or uninfected Huh7.5.1 cells was analyzed by single factor analysis of variance testing.

RESULTSThe HCV infection system was successfully established, as evidenced by expression of NS5A protein and core protein. The GADD45a mRNA and protein levels were significantly down-regulated in JFH1-infected Huh7.5.1 cells, by 0.57+/-0.09 and 0.28+/-0.03, respectively, as compared to levels in uninfected Huh7.5.1 cells (F values were 75.407 and 560.04, respectively; P less than 0.01).

CONCLUSIONHCV inhibits the mRNA transcription and protein expression of host GADD45a, which may contribute to the pathogenesis of hepatocellular carcinoma caused by HCV infection.

Cell Line, Tumor ; DNA Damage ; Hepacivirus ; classification ; Humans ; Intracellular Signaling Peptides and Proteins ; metabolism ; Transcription, Genetic

BACKGROUNDNumerous studies have reported a relationship between hepatitis C virus (HCV) genotype and the response to interferon therapy. Despite high sensitivity and specificity, genotyping methods can be performed only on HCV RNA positive samples. Serotyping might be a rapid and cost effective method for determining HCV genotypes, especially in patients with previously undetectable HCV RNA. In this study, an enzyme linked immunosorbent assay (ELISA) method for HCV serotyping with the genotype specific, synthetic peptides derived from HCV nonstructural 5a (NS5A) region was developed.

METHODSBased on 45 sequences, representing HCV genotypes 1 - 6 from Genebank, we synthesised 305 overlapping 30-mer peptides within NS5A region at positions 2182 - 2343 of HCV. All peptides for antigenic reactivity were tested by enzyme immunoassay with 69 human sera with antiHCV positive representing genotype 1 - 6. Forty hepatitis C patient sera were serotyped using serotype specific, synthetic peptides and genotyped by sequencing analysis.

RESULTSThe correspondence of amino acids in HCV NS5A region with amino acids in positions 2182 - 2343 was very low among different genotype peptides. The highly conserved sequences were residues 2182 - 2211 (R1), 2272 - 2301 (R7) and 2302 - 2331 (R9): the highly variable 2212 - 2241 (R3) and 2257 - 2286 (R6). Using 305 peptides, antigenic regions were located in R3, R7 and R9. Eighteen peptides from highly conserved region representing genotypes 1 to 6 showed broad immunoreactivity with sera containing antibody to all HCV genotypes. Immunoreactivity of the peptides from highly variable region was stronger with similar genotype sera. Twelve unique peptides showed highly, genotype specific, reactivity with types 1 and 3 sera. Type 2 genotype specific peptides had cross reaction with type 3 serum. No type 4, 5 or 6 specific peptides were selected. The serotyping results showed high agreement with sequencing analysis.

CONCLUSIONSThe major antigenic regions in HCV NS5A region were at 2212 - 2241 (R3), 2272 - 2301 (R7) and 2302 - 2331 (R9). Eighteen peptides from highly conserved region show genotype independent, immunoreactivity, useful for antiHCV antibody test. Twelve peptides from highly variable region show genotype 1 and 3 dependent immunoreactivity, useful for determining HCV serotype, especially for patients with previously undetectable HCV RNA.

Amino Acid Sequence ; Genotype ; Hepacivirus ; classification ; genetics ; Humans ; Molecular Sequence Data ; Serotyping ; Viral Nonstructural Proteins ; chemistry ; immunology

Alanine Transaminase ; blood ; Genotype ; Hepacivirus ; classification ; genetics ; Hepatitis C, Chronic ; drug therapy ; immunology ; virology ; Humans ; RNA, Viral ; blood

Hepacivirus ; classification ; genetics ; Hepatitis C ; diagnosis ; Hepatitis C Antibodies ; blood ; Humans ; RNA, Viral ; blood ; Viral Core Proteins ; blood

OBJECTIVETo determine the distribution of HCV genotypes among volunteer blood donors in Guangzhou.

METHODSSix-nine HCV RNA-positive samples were collected from volunteer blood donors in Guangzhou. NS5B fragments of HCV were amplified followed by DNA sequencing and phylogenetic analysis.

RESULTSHCV genotypes were determined for 67 samples. Among them, the subtypes 1b, 2a, 3a, 3b, 6a and 6n were detected at the frequencies of 37.31%, 4.48%, 7.46%, 4.48%, 44.78% and 1.49%, respectively.

CONCLUSIONHCV 1b and 6a are the most predominant two subtypes among volunteer blood donors in Guangzhou.

Blood Donors ; China ; Genotype ; Hepacivirus ; classification ; genetics ; isolation & purification ; Humans ; Phylogeny ; RNA, Viral ; genetics ; Sequence Analysis, DNA