7 research outputs found
Comparison of IFN-alpha 2b with or without ribavirin for treatment of chronic hepatitis C in HIV-positive patients infected with hepatitis C virus genotype 3a
Evolution of hepatitis C vitus non structural 5A gene (NS5A) in the progression of liver disease to hepatocellular carcinoma
Genetic heterogeneity of hepatitis C virus in HBV/HCV co-infection
none8noneM.S. De Mitri; G. Morsica; R. Cassini; S. Bagaglio; P. Andreone; G. Bianchi; M. Margotti; M. BernardiM.S. De Mitri; G. Morsica; R. Cassini; S. Bagaglio; P. Andreone; G. Bianchi; M. Margotti; M. Bernard
Genetic variability of hepatitis C virus in HBV/HCV co-infection and HCV single-infection
Virological analysis, genotypes and mutational patterns of the HBV pre-core/core gene in HBV/HCV-related hepatocellular carcinoma
We investigated the replicative profile of hepatitis B (HBV) and hepatitis C (HCV) viruses and the mutational pattern of the HBV precore/core (pre-C/C) domain in hepatocellular carcinoma (HCC). Thirty-eight consecutive patients with HCC were included in the study - 18 of them with HBV/HCV co-infection and 20 with HBV single infection. Twenty-three additional patients with co-infection, without HCC were recruited as the control group. Replication activity was evaluated by detecting and quantitating both HBV and HCV genomes. The HBV pre-C/C region, encompassing the pregenome encapsidation signal involved in viral replication, was analysed by direct sequencing. HBV viraemia levels were significantly lower (P = 0.04) in patients with co-infection in comparison with single-infected HCC, whereas two different HBV viraemia profiles were detected in co-infection with or without circulating HCV. HBV genotype D was prevalent in the three groups and HCV genotype 1b was found to be the infecting strain in all patients. Lower variability in the pre-C/C region was found in co-infection in comparison with HBV single infection (P = 0.0004). A synonymous T1936C mutation was found in all co-infected HCC cases not related to the presence or absence of circulating HCV, and a hypermutated pre-C strain, characterized by the same mutational pattern, was identified in three HCC cases. The mutational pattern of the pre-C/C region was closely related to HBV replication efficiency, and specific HBV mutations selectively associated with HCV co-infection could be linked with accelerated HBV/HCV-related disease progression. © 2006 The Authors
Low replication and variability of HBV pre-core in concomitant infection with hepatitis B and hepatitis C viruses
A novel stop codon mutation within the hepatitis B surface gene is detected in the liver but not in the peripheral blood mononuclear cells of HIV-infected individuals with occult HBV infection.
To characterize occult HBV infection (OHB) in
different compartments of HIV+ individuals. This retrospective
study involved 38 consecutive HIV+ patients; 24 HBsAg
negative (HBV)) and 14 HBsAg positive (HBV+). OHB was
assessed in serum samples, liver tissue (LT) and peripheral
blood mononuclear cells (PBMC) by genomic amplification of
the partial S, X and precore/core regions. HBV genomic
analysis was inferred by direct sequencing of PCR products.
The intracellular HBV-DNA was measured by a quantitative
real-time PCR. HBV+ patients were used as a control for HBV
replication and genomic profile. In HBV) patients, HBV-DNA
was undetectable in all serum samples, while it was found
positive in 7/24 (29%) LT in which genotype D prevailed
(57%). HBV-DNA was found in 6/7 (86%) PBMC of occultpositive
and none of occult-negative LT. Significantly lower
HBV-DNA load was present in both compartments in OHB+
with respect to the HBV+ group (LT: P = 0.002; PBMC:
P = 0.026). In the occult-positive cases, HBV replication was
significantly higher in LT than in PBMC (P = 0.028). A hyper-
mutated S gene in PBMC and a nucleotide mutation at
position C695 in LT that produces a translational stop codon
at amino acid 181 of the HBs gene characterized OHB. In this
group of HIV+ persons, OHB is frequent and exhibits lower
replication levels than chronic HBV in the different compartments
examined. HBV-DNA detection in PBMC may offer
a useful tool to identify OHB in serum-negative cases. The
novel HBs gene stop codon found in LT could be responsible
for reduced production leading to undetectability of HBsAg