三、几种典型病毒基因组 (一)HBV基因组 HBV是乙肝的病原体,它可造成持续性感染,引起急、 慢性肝炎,部分患者可发生肝硬化,HBV与原发性肝癌发 生密切相关。 26
26 (一)HBV基因组 HBV是乙肝的病原体,它可造成持续性感染,引起急、 慢性肝炎,部分患者可发生肝硬化,HBV与原发性肝癌发 生密切相关。 三、几种典型病毒基因组
全球HBV感染流行情况 20亿人曾感染HBV, 占全球人▣13 慢性HBV感染者 3.54亿,占全球 人口>5%,其中 亚洲占23,中 国占13 每年因乙肝相关死亡 全球60亿人口 100万例,占死因第7位 WHO and CDC fact sheets,available at www.who.int and www.cdc.gov Van Damme P.Vaccine,2004,3:249-267 27
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我国HBV感染流行情况 7~8亿人曾感染HBV, 占全国人口57.6% 慢性HBV感染者1.2亿 ,占全国人口约10% 每年因乙肝相关死亡30万 全国13亿人口 例,占传染病死亡第一位 WHO and CDC fact sheets,available at www.who.int and www.cdc.gov Van Damme P.Vaccine,2004 28
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1、HBV基本结构 (1)电镜下观察 ①呈圆球形,直径约42nm,称Dane颗粒(以发现者命名); ②中间含1个致密的内核(core),直径约27nm; ③外为1层约14nm外壳(capsid)。 (2)①表面有HBsAg(hepatitis B virus surface antigen); ②核心有HBCAg和HBeAg; ③含DNA pol、.prorein kinase(蛋白邀酶)和reverse transcriptase(逆转录酶),后者与病毒复制特点有关。 29
29 1、HBV基本结构 (1)电镜下观察 ①呈圆球形,直径约42nm,称Dane颗粒(以发现者命名); ②中间含1个致密的内核(core),直径约27nm; ③外为1层约14nm外壳(capsid)。 (2)①表面有HBsAg(hepatitis B virus surface antigen); ②核心有HBcAg和HBeAg; ③含DNA pol、prorein kinase(蛋白激酶)和reverse transcriptase(逆转录酶),后者与病毒复制特点有关
Dane particle sphere 47 nm preS1 preS2 22 nm filament Fig.2b variable length Fig.2a (left graphic):Electron Microscop Presentation of HBV Particles.The round 42 nm particles(1)represent infectious virions (Dane particle).The small empty spheres (3)and the filaments (3)are non infectious.The preparation was enriched in virus particles(EM picture by courtesy of H.-W.Zentgraf,Heidelberg) Fig.2b (right graphic):Schematic representation ofthe three types of particles with the three envelope proteins (L,M and S)the core protein,the polymerase (RT,RNAseH and TP)and the partially double stranded DNA genome 30
30 Fig.2a (left graphic): Electron Microscop Presentation of HBV Particles. The round 42 nm particles (1) represent infectious virions (Dane particle). The small empty spheres (3) and the filaments (3) are non infectious. The preparation was enriched in virus particles (EM picture by courtesy of H.-W. Zentgraf, Heidelberg) Fig.2b (right graphic): Schematic representation of the three types of particles with the three envelope proteins (L, M and S) the core protein, the polymerase (RT, RNAseH and TP) and the partially double stranded DNA genome