RESUMO
With the aim of investigating whether interleukin 28B gene (IL28B) rs1297860 polymorphism is associated with different hepatitis C (HCV) infection statuses, we compared IL28B allelic distribution in an Italian case series of 1050 patients with chronic infection and different outcomes, 47 individuals who spontaneously cleared HCV, and 178 blood donors. Furthermore, we compared IL28B variants among 3882 Caucasian patients with chronic infection, 397 with spontaneous clearance, and 1366 blood donors reported in PubMed. Overall data confirmed a relation between IL28B C allele and HCV spontaneous clearance. Furthermore, we found that IL28B T allele had a weak relation with chronic HCV progression to hepatocellular carcinoma. Study findings are in accordance with the hepatocellular carcinogenic model where IL28B TT genotype, by promoting a persistent chronic hepatitis which leads to both hepatocyte injury and chronic inflammation, could facilitate HCC development. Conversely, patients with lymphoproliferative disorders had not any significantly different IL28B rs1297860 allelic distribution than those with chronic HCV, but, like all chronic HCV-related diseases, they showed a lower CC frequency than patients who spontaneously cleared HCV. Study results confirmed the model of persistent HCV infection as a risk factor for the pathogenesis of both liver and lymphoproliferative disorders.
Assuntos
Hepacivirus/genética , Hepatite C/genética , Interleucinas , Idoso , Alelos , Carcinoma Hepatocelular/complicações , Carcinoma Hepatocelular/genética , Carcinoma Hepatocelular/patologia , Feminino , Hepacivirus/imunologia , Hepacivirus/patogenicidade , Hepatite C/imunologia , Humanos , Imunogenética , Interferons , Interleucinas/genética , Interleucinas/imunologia , Neoplasias Hepáticas/complicações , Neoplasias Hepáticas/genética , Neoplasias Hepáticas/patologia , Masculino , Pessoa de Meia-Idade , Polimorfismo de Nucleotídeo ÚnicoRESUMO
We compared a home-made sequencing system to analyze plasma samples from patients with chronic HBV infection with the commercial TRUGENE(®) HBV Genotyping Assay. A PCR and sequencing protocol based on published primers was applied to detect the viral genotypes as well as the major patterns of point mutations leading to resistance to lamivudine, adefovir and entecavir. For the determination of HBV genotypes the obtained sequences were aligned with a database created within the RIDOM TraceEdit program and publicly available reference sequences. Our results showed perfect correlation with the commercial system, with types D (72%) and A (22%) being the most frequent genotypes. The resistance loci were also reliably detected with mostly combined L180M and M204V/I mutations as the local patterns. M204I mutations were more frequent in genotype D, M204V in genotype A isolates. G173L mutations were not found. The only genotype C isolate tested revealed a different pattern (E263D and I269L). These data speak for the usability of this rapid amplification and sequencing approach for routine genotyping of HBV isolates and simultaneous determination of the drug resistance profile of the dominant viral species.
