title: [Study on the distribution of hepatitis B virus precore and basic core promoter mutations in Guizhou area].
abstract: OBJECTIVE
  To investigate the distribution of hepatitis B virus (HBV) precore A1896 and basic core promoter (BCP)T1762/A1764 mutations in Guizhou area.
  
  
  METHODS
  482 patients with chronic HBV infection, belonging to 4 nationalities, including 225 asymptomatic carriers (ASC), 158 chronic hepatitis (CH), 57 liver cirrhosis (LC), 42 hepatocellular carcinoma (HCC), from 4 areas of Guizhou province were examined. HBV A1896 and T1762/A1764 mutations were determined by direct sequencing and restriction fragment length polymorphism (RFLP). HBV genotypes were determined by PCR-RFLP based on S gene. The relationship among these mutations and genotype and the progression of liver disease were studied by multi-normal logistic regression analysis.
  
  
  RESULTS
  A1896 and T1762/A1764 mutations were detected 23.03% and 29.67% among 482 patients. These mutations were more prevalent in Hans than in Dong, Miao and Buyi minorities (P < 0.01, respectively). The mutations of A1896 and T1762/ A1764 were more commonly seen in HBeAg negative than in HBeAg positive patients (P < 0.01, respectively). The mutation of T1762/A1764 was significantly higher in genotype C than in genotype B (P < 0.01). There were significantly statistical differences in the detective rate of A1896 and T1762/ A1764 mutations between patients with HCC, LC and CH, ASC. The distribution of these mutations in Guiyang (31.79% and 41.06%) was higher than in Zunye (10.94%, 14.06%), Duyun (8.64%, 11.11%) or Kaili (2.86%, 2.86%). However, there was no statistical difference by multi-normal logistic regression analysis after controlling the influence of HBeAg statu, genotype and clinical types.
  
  
  CONCLUSIONS
  The distributions of A1896 and T1762/A1764 mutations were different in some nationalities of Guizhou province. The mutation of T1762/A1764 was more commonly seen in genotype C than in genotypr B. These mutations were closely related to progression of chronic liver diseases. Hepatitis B virus; Genotype; Restriction fragment length polymorphism
authors.affiliation: Department of Infectious Diseases, Guiyang Medical College Affiliated Hospital, Guiyang 550004, China. dingjj@vip.163.com
authors.forename: Jing-juan
authors.initials: JJ
authors.lastname: Ding
authors.forename: Yue-hui
authors.initials: YH
authors.lastname: Liu
authors.forename: Mei
authors.initials: M
authors.lastname: Wang
mesh_terms: D002681:China; D004252:DNA Mutational Analysis; D018450:Disease Progression; D005838:Genotype; D006509:Hepatitis B / Q000473:pathology*; D006515:Hepatitis B virus / Q000235:genetics*; D006801:Humans; D009154:Mutation; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length