【摘要】 目的　研究乙型肝炎病毒 (hepatitisBvirus ,HBV)基因型和血清亚型的分布特点及其基因的相关性。方法　湖南、广西、河南和河北 4省 (区 ) 2 5个县 (市 ) 2 80例慢性HBV携带者 ,应用聚合酶链反应 (PCR)扩增和脱氧核糖核酸 (DNA)序列分析 ,确定HBV基因型和血清亚型。结果　HBV基因型B、C和D均有分布 ,分别占 2 9.3%、6 7.9%和 2 .9% ,其中B和C为优势基因型。adr、adw2、ayr、ayw1、ayw2和ayw3等 6种血清亚型均有分布 ,其中adr和adw2为优势血清亚型 ,分别占6 4.3%和 31.4%。基因型B与adw2血清亚型 ,基因型C与adr血清亚型有非常密切的基因相关性。 2 80例HBV携带者表面抗原基因序列每 10 0个核苷酸的平均置换频数为 2 .94。基因型B(adw2血清亚型 )毒株核苷酸置换频数为 5 .6 3(5 .48) ,而基因型C(adr血清亚型 )仅为 1.6 (1.5 1)。结论　HBV基因型和血清亚型的分布均有明显的地区性 ;基因型B及相对应的adw2血清亚型毒株的基因可变性明显高于基因型C及相应的adr血清亚型。更多还原

【Abstract】 Objective To determine the distribution and genetic relationship of hepatitis B virus (HBV) genotypes and subtypes. Methods HBV genotypes and subtypes were determined by PCR and DNA sequencing among 280 chronic HBV carriers in 25 counties of 4 provinces (Hunan, Guangxi, Henan and Hebei) in China. Results Genotype B, C and D were detected in these regions. Genotypes C and B were the majority genotypes of HBV with 190 out of 280 ( 67.9 %) genotype C, 82 ( 29.3 %) genotype B, and 8 ( 2.9 %) genotype D. Adr, adw2, ayr, ayw1, ayw2 and ayw3 subtypes were determined among these carriers. Adr and adw2 subtypes were the leading subtypes of HBV,taking up 64.3 % and 31.4 %, respectively.Adr subtype was completely encoded by genotype C while majority of adw2 subtype was encoded by genotype B.An average rate nucleotide substitutions of 2.94 was seen among 280 Chinese HBV sequences. The average rate of nucleotide substitutions of genotype B (adw2 subtype) was 5.63 ( 5.48 ), but only 1.6 ( 1.51 ) for genotype C (adr subtype). Conclusion The results suggested that there were significant differences in geographic distribution of HBV genotypes and subtypes; genotype B, in which mostly consistent with adw2 subtype, was a higher variable than genotype C (adr subtype).更多还原