Absence of extensive genetic heterogeneity of hepatitis C virus in antibody-negative chronic hepatitis C

Hepatitis C virus (HCV) carriers usually have antibodies to HCV; however, there are viremic individuals without these antibodies. To investigate whether variations of the viral genome are responsible for this discrepancy, the nucleotide and deduced amino acid sequences of HCV capsid and nonstructural regions obtained from 15 viremic patients were examined. These 15 patients were infected with type 1b HCV, and 10 did not have antibody to HCV assayed with second-generation tests. The nucleotide homology of the 5 seropositive and 10 seronegative patients with the HCV prototype sequence were 91.6% and 91.9%, respectively, in the capsid region. There was no apparent difference in the deduced amino acid sequences between the two groups of patients studied (94% vs. 95%). The nucleotide and amino acid sequences of a part of the nonstructural region 3 also showed similar results. These findings suggest that absence of antibodies against both capsid and nonstructural peptides in HCV carriers is not caused by genetic heterogeneity of the viral epitopes. © 1996 Wiley-Liss, Inc.     

HCV耐药突变在三个Ⅰb期临床试验中对DAA单药给药后短期疗效影响的分析

耐药相关突变(Resistance-associated substitutions,RASs)是丙型肝炎病毒(Hepatitis C virus,HCV)治疗的关键因素,并与一些直接抗病毒药物(Direct acting antivirals,DAAs)为基础的治疗方案的治疗结果相关.在本研究中,我们主要分析了三个Ⅰ...     

Clinical outcomes following DAA therapy in patients with HCV-related cirrhosis depend on disease severity

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HCV胶体金试剂在急诊患者手术输血前的快速检测

目的应用HCV胶体金试剂对急诊手术患者输血前进行检测,并与抗-HCV ELISA法进行比较。方法对本医院2008年1～10月的3216例急诊手术患者,先应用HCV胶体金试剂检测抗体,再分别用试剂①、②两种抗-HCV试剂进行ELISA法检测。对HCV胶体金试剂、试剂①、②检测为阳性的标本,再进行HCV RNA RT—PCR荧光定量检测。结果3216份标本中HCV胶体金试剂检测阳性25份,抗-HCV试剂①ELISA法检测阳性33份,试剂②检测阳性34份（两种试剂均阳性26份,仅试剂①、②阳性的分别为7和8份）。HCV RNA RT—PCR荧光定量检测阳性28份。结论HCV胶体金法与抗-HCV ELISA法结果符合率为92．59％,与HCV RNA RT—PCR荧光定量法结果符合率89．29％,HCV胶体金试纸法假阳性率低,操作简便、快速,适合急诊患者手术前输血的筛选。     

Validation of interleukin 28B genotyping assay for clinical use

Objectives

The favorable CC genotype at rs12979860 upstream of the interleukin (IL)-28B gene is correlated with a greater post-treatment sustained virologic response rate in chronic hepatitis C infected patients. We report on our validation of a clinical genotyping assay for rs12979860 polymorphisms in the IL28B locus.

Design and methods

The rs12979860 genotype was determined using a TaqMan® Real-Time PCR allelic discrimination assay with primers and probes specific for the C and T alleles on the Applied Biosystems 7500 Fast Real-Time PCR System.

Results

The rs12979860 genotype determined by our assay was concordant with the genotypes obtained from a reference laboratory. The allelic frequency was similar to that reported in the HapMap project (rs12979860 C = 0.65, T = 0.35) and did not deviate from Hardy–Weinberg equilibrium.

Conclusion

Clinical availability of this assay in conjunction with other factors will allow the prediction of the individual patient's response to therapy.