献血员隐匿性乙型肝炎病毒感染的分子流行病学

目的 了解献血员中隐匿性HBV感染的发生率,从S基因变异角度探讨隐匿性HBV感染可能的分子机制.方法 收集经血站筛查HBsAg阴性的合格献血员血浆594份,ELISA法检测HBV血清学标志物,套式PCR检测血清HBV DNA.对筛查出的隐匿性HBV感染者再次用雅培试剂定量检测HBV血清学标志物,并对其S区进行测序,发现可能与HBV隐匿性感染有关的变异位点.随机收集11例HBsAg阳性的HBV感染者作为阳性对照,对其S区进行测序,比较其与隐匿性HBV感染之间的关系.结果 在594例献血员中有15例为隐匿性HBV感染,隐匿性HBV感染的发生率为2.5％.未发现HBV血清学标志物检测结果与隐匿性HBV感染有相关性.15例隐匿性HBV感染者中有10例进行了S区测序,结果HBV均有不同程度的变异,其中3例在“a”决定簇内出现氨基酸突变,分别为1126T(1例)、T140I(2例).与隐匿性HBV感染者相比,阳性对照在“a”决定簇内仅出现了1例T131N变异.结论 常规检测HBsAg阴性的献血员中存在隐匿性HBV感染,且这些病毒可能存在变异.     

唐山地区献血人群隐匿性乙型肝炎病毒感染分析

目的了解唐山地区无偿献血人群隐匿性乙型肝炎感染情况。方法用ELISA法检测无偿献血者的乙型肝炎血清标志物,对于HBsAg阴性样本,进行HBV核酸检测（NAT）,NAT阳性样本,用罗氏试剂确证HBV DNA载量。结果共检测116 741例血样,证实隐匿性乙型肝炎感染者35例,占总献血人数的0.29‰。其中97.1%隐匿性乙型肝炎感染者样本的HBV DNA滴度低于102IU/ml。在HBV DNA阳性人群中,抗-HBc阳性率较高,占81.5%,抗-HBs阳性或乙型肝炎病毒血清标志物全阴性也可检出HBV DNA分别占55.6%和22.9%。结论唐山地区献血人群中血清HBsAg阴性者存在一定比例的隐匿性HBV感染,其HBV病毒载量均较低,核酸检测能够提高HBV感染的检出率。     

HBsAg与抗-HBs同时阳性的慢性乙型肝炎患者临床特点分析

目的分析HBsAg与抗-HBs同时阳性的现象及其临床特点,并探讨其产生的原因。方法收集2011年2月-2014年2月东南大学附属第二医院体检者2260例,其中被诊断为慢性乙型肝炎的患者830例。采用化学发光微粒子免疫分析法筛选HBsAg与抗-HBs同时阳性的患者188例,分为HBeAg阳性组(n=101)和HBeAg阴性组(n=87)。同时选取200例HBsAg阳性、抗-HBs阴性者作为对照,其中HBeAg阳性组80例,HBeAg阴性组120例。检测HBV血清学标志物、肝功能、病毒载量并结合临床进行分析。计数资料组间比较采用χ2检验。结果 HBV血清学标志物在HBsAg与抗-HBs双阳性情况下共有5种模式,其中以HBsAg、抗-HBs、HBeAg及抗-HBc阳性,且抗-HBe阴性多见,占47.9%(90/188),肝功能指标总异常率为69.1%(130/188),HBV DNA总阳性率为56.9%(107/188)。HBeAg阳性的2组HBV DNA均存在高水平复制,其中HBsAg与抗-HBs双阳性组HBV DNA阳性率与对照组比较,差异无统计学意义(χ2=2.632,P0.05);HBeAg阴性组中,HBsAg与抗-HBs双阳性组HBV DNA定量1×105IU/ml的比例与对照组比较,差异有统计学意义(χ2=10.740,P0.05)。对HBV S区进行测序分析发现,测序的80例HBsAg与抗-HBs双阳性患者中有27例患者的HBV S区发生变异,突变率33.7%,且S区变异位点主要有P29L、S61L、P62L、I126T/S、Q129N、M133K、F134L、G145R/K、L175S和L186H等。结论 HBsAg与抗-HBs同时阳性者在乙型肝炎患者中有一定比例,其主要原因可能是病毒株变异所致。这种情况并不代表疾病好转,且抗-HBs出现并不一定能完全有效清除HBsAg,病毒DNA往往存在持续复制,需引起重视。     

慢性乙型肝炎病毒感染者家族隐匿性乙型肝炎病毒感染的调查

目的 了解慢性HBV感染者家族隐匿性HBV感染的发生率及其与HBV标志物、年龄和性别等的关系.方法 ELISA方法检测慢性HBV感染者家族成员的HBV血清学标志物,套式PCR法检测136例HBsAg阴性家族成员的血清HBV DNA,并将隐匿性HBV感染者和HBsAg、HBV DNA均阴性者分别作为试验组和对照组进行HBV标志物、年龄、性别和生物化学检测结果的比较.两组均数比较采用t检验.率的比较采用χ~2检验或Fisher确切概率法检验.结果 在52个慢性HBV感染者家族中共检测到92例HBsAg阳性者和136例HBsAg阴性者,其中15例为隐匿性HBV感染者,慢性HBV感染者家族HBsAg阳性率和隐匿性HBV感染的发生率分别为40.4%和11.0%,15例隐匿性HBV感染者中有7例抗-HBc阳性(χ~2=5.341,P=0.02),但隐匿性HBV感染的存在与年龄、性别等无关.结论 HBV感染存在家庭聚集现象,且在其家族中存在隐匿性HBV感染,并在抗-HBc阳性者中发生率较高.     

乙型肝炎患者血清HBeAg和抗-HBe与HBV DNA定量的关系

目的分析比较HBV血清标志物HBe Ag与抗-HBe同时阳性、同时阴性及单独阳性患者的病毒复制情况。方法采用电化学发光法检测HBV血清标志物,从中筛选出HBe Ag与抗-HBe同时阳性或均为阴性以及HBe Ag单独阳性或抗-HBe单独阳性的标本,检测该类标本HBV DNA定量值。计数资料组间比较采用χ2检验。结果检测447例患者HBV血清标志物,所有患者HBs Ag均为阳性。HBe Ag与抗-HBe同时阳性患者32例,阳性率为7.16%,其中HBV DNA5×102拷贝/ml占84.38%,5×102拷贝/mlHBV DNA1×104拷贝/ml占12.50%,1×104拷贝/mlHBV DNA1×107拷贝/ml占3.13%;HBe Ag与抗-HBe同时阳性组的HBV DNA含量分布低于HBe Ag单独阳性组,差异有统计学意义(χ2=13.21,P0.01);抗-HBe阳性组的HBV DNA含量分布低于抗-HBe阴性组(χ2=74.12,P0.01);HBe Ag阴性的患者218例,HBV DNA1×104拷贝/ml共9例(4.13%)。结论HBe Ag与抗-HBe同时阳性过去认为是不常见模式,但临床上并不少见,且病毒复制处于较高水平的仍占一定比例;当抗-HBe出现后,病毒复制减弱。血清HBe Ag阴性情况下,部分患者病毒仍存在较高水平复制。因此,HBe Ag存在与否不能作为抗病毒、疗效评价、传染性强弱的依据。     

乙型肝炎病毒e抗原阳性孕妇所生婴儿联合免疫接种后乙型肝炎病毒血清学标志物的动态变化

目的 观察HBeAg阳性且HBV DNA高载量孕妇所生婴儿用乙型肝炎疫苗联合免疫接种后的母婴阻断效果及HBV血清学标志物的动态变化.方法 回顾性分析HBeAg阳性且HBVDNA≥106拷贝/ml孕妇127例,婴儿出生后即刻及第15天于臀大肌注射高效价乙型肝炎免疫球蛋白200 IU,出生时与第1、6个月于右上臂肌肉注射乙型肝炎疫苗20μg,随访其婴儿至12个月龄.用酶联免疫吸附法及荧光定量PcR检测婴儿出生时及第1、7、12个月时的HBV血清学标志物和HBV DNA载量,观察婴儿出生时HBV血清学标志物模式、母婴传播率、疫苗接种后的HBV宫内感染率、抗-HBs阳性保护率及HBV血清学标志物动态变化.结果 127例孕妇分娩婴儿均为单胎,出生时29例婴儿HBsAg为阳性,其中11例合并HBV DNA阳性,母婴垂直传播率为22.83％.随访至1个月,10例婴儿合并HBV DNA阳性从而发生HBV宫内感染,表现为HBsAg、HBeAg及抗-HBc均为阳性.2例婴儿HBsAg弱阳性,伴有抗-HBs滴度的产生,后续随访中均转阴,乙型肝炎宫内感染率为7.87％.非宫内感染婴儿出生时HBeAg及抗-HBc阳性率分别为96.58％和98.29％,免疫接种后婴儿HBeAg及抗-HBc逐步转阴,均未产生抗-Hbe.非宫内感染婴儿均产生有效乙型肝炎保护性抗体,乙型肝炎疫苗及高效价乙型肝炎免疫球蛋白联合免疫接种后,婴儿抗-HBs滴度从出生至12个月龄逐步上升,母源性HBeAg滴度逐步下降以至转阴.结论 乙型肝炎疫苗联合高效价乙型肝炎免疫球蛋白免疫接种能明显降低HBV母婴传播,增强婴儿乙型肝炎表面抗原保护性抗体,体内母源性HBeAg及抗-HBc亦随之降低甚至转阴.     

人类免疫缺陷病毒感染者合并隐匿性乙型肝炎病毒感染的现状调查

目的 调查分析上海地区HIV感染者中隐匿性HBV感染的流行现状.方法 对上海市公共卫生临床中心就诊的HIV感染者在尚未接受抗病毒治疗前采集血标本,检测HBsAg、抗-HBs、HBeAg、抗-HBe、抗-HBc,抗-HCV,CD4+T细胞计数,使用巢式PCR法检测HBV S区.结果 105例(男92例,女13例)HBsAg阴性的HIV感染者中32例(男27例,女5例)HBV DNA阳性;16～30岁年龄组22例,其中5例HBV DNA阳性,31～49岁年龄组44例,其中15例HBV DNA阳性,50～75岁年龄组39例,其中12例HBV DNA阳性;32例中有27例至少一项HBV血清学标志物阳性,5例均阴性.47例合并HCV感染者中有14例HBV DNA阳性,阳性率29.8%;58例未合并HCV感染的HIV感染者中18例HBV DNA阳性,阳性率为31.0%.CD4+T细胞计数平均值145.1个/μ(4～623个/μ1),75例CD4+T细胞<200个/μ1的患者中有26例HBV DNA阳性,约占34.7%,30例CD4+T细胞>200/μ1患者中有6例HBV DNA阳性,阳性率为20.0%.以上各项之间两两相比差异均无统计学意义.结论 HIV感染者中存在隐匿性HBV感染,且与HIV感染者性别、年龄、HBV标志物、是否合并HCV感染及CD4+T细胞计数无明显相关.     

献血者HBV筛查模式的探讨

目的:对献血者血液筛查HBV阳性样本进行深入分析,探讨献血者HBV筛查模式,以提高献血者HBV筛查的有效率,减少不必要的血液浪费。方法:收集165例经胶体金检测HBsAg阴性而HBsAg酶联免疫(ELISA)阳性和(或)HBV核酸检测阳性的血液样本,定量检测其HBV血清学标志物,进行HBV S区序列分析。结果:2种ELISA试剂检测为阳性的样本共73例(44.24%),抗-HBc抗体阳性率为90.41%,HBsAg定量检测阳性率为75.34%;仅1种ELISA试剂检测为阳性的样本共68例(41.21%),抗-HBc抗体阳性率为26.47%,HBsAg定量检测阳性率为1.47%;HBsAg定量检测阳性样本中79.31%的HBsAg低于10 IU/mL;共扩增出35例HBV S区片段,30例确定为HBV C型基因,5例确定为B型基因,未发现影响HBsAg检测的突变。结论:HBV病毒载量、HBsAg水平极低可导致HBV筛查假阴性,而单独1种ELISA试剂检测HBsAg存在较多假阳性结果。实验室可结合HBV检测方法及检测试剂的性能验证结果,制订适合自身的检测策略。     

HBV前S1抗原在乙型肝炎临床诊断中的意义

目的探讨乙型肝炎(乙肝)病毒前S1抗原在乙肝病毒感染中的临床意义。方法分析1088例HBV前S1抗原阳性结果与乙肝5项病毒学指标和HBV DNA结果的关系。结果前S1抗原阳性的乙肝5项病毒学指标结果出现6种模式,其中HBsAg、HBeAg、抗HBc阳性患者的前S1抗原阳性率为88.74%;HBsAg、抗HBe、抗HBc阳性患者前S1抗原阳性率为41.32%,2组间有显著差异(P<0.05),而HBsAg及抗HBc阳性组前S1抗原阳性率介于HBsAg、HBeAg、抗HBc阳性组与HBsAg、抗HBe、抗HBc阳性组之间。HBsAg、HBeAg、抗HBc阳性患者前S1抗原阳性率随着HBV DNA载量的升高而增加(各组间P<0.05)。HBeAg、前S1抗原与HBV DNA三者间有很好的一致性。结论检测前S1抗原是对HBsAg、HBeAg及HBV DNA检测的重要补充。在防止乙肝漏诊、误诊及了解疾病的转归等方面都具有重要的临床意义。     

胎盘HBsAg与新生儿乙型肝炎病毒血清学标志物的关系

目的 探讨HBsAg阳性孕妇胎盘HBsAg与新生儿HBV血清学标志物和HBVDNA的关系.方法 免疫组织化学亲和素-生物素复合物(ABC)法检测155例HBsAg阳性孕妇的胎盘HBsAg,ELISA法检测新生儿HBV血清学标志物,荧光定量PCR法检测新生儿血清HBVDNA.各指标阳性率的比较采用x2检验.结果 155例孕妇的胎盘各型细胞均存在不同程度的HBsAg阳性表达,总的胎盘HBsAg阳性58份,阳性率为37.4％;蜕膜细胞、滋养层细胞、绒毛间质细胞和绒毛毛细血管内皮细胞HBsAg阳性各有58、40、29和11份,阳性率分别为37.4％、25.8％、18.7％和7.1％;胎盘从母体面的蜕膜细胞至胎儿面的绒毛毛细血管内皮细胞HBsAg阳性率逐渐下降(趋势x2=43.01,P=0.00).胎盘HBsAg阳性与新生儿HBsAg、HBeAg阳性均有关(x2=4.88,P＜0.05;x2 =3.86,P＜0.05),而与新生儿抗-HBe、抗-HBc无关(x2=3.36,P＞0.05;x2=0.00,P＞0.05).胎儿面的绒毛毛细血管内皮细胞和绒毛间质细胞HBsAg阳性时,新生儿HBsAg阳性的危险性高(OR=5.31,95 ％CI:1.38～20.40;OR=3.33,95％CI:1.16～9.52);而滋养层细胞和绒毛间质细胞HBsAg阳性时,新生儿HBeAg阳性的危险性较大(OR=3.04,95％ CI:1.45～6.39;OR=3.05,95％CI:1.32～7.03);胎盘HBsAg阳性与新生儿HBV DNA阳性无关(x2=0.09,P＞0.05).结论 越接近胎儿面的胎盘细胞HBsAg表达阳性,新生儿HBV血清学标志物阳性的危险性越大.HBsAg在胎盘中以“逐层转移”的方式进入胎儿血循环.     

慢性乙型肝炎患者肝细胞内乙型肝炎核心抗原阳性的临床意义

目的探讨CHB患者肝组织HBcAg阳性的意义。方法对200例CHB患者应用荧光聚合酶链反应（FQ-PCR）法精确定量检测血清HBV DNA含量。患者均检测血清中HBeAg含量,同时进行肝活组织检查,应用免疫组织化学技术检测HBcAg情况,并进行相关性分析。结果按测定血清HBV DNA水平,分为A组（＜3 log10拷贝/ml）20例,B组（≥3 log10拷贝/ml-＜5 log10拷贝/ml）13例,C组（≥5 log10拷贝/ml～＜6 log10拷贝/ml）24例,D组（≥6 log10拷贝/ml～＜8 log10拷贝/ml）116例,E组（≥8 log10拷贝/ml）27例。肝组织HBcAg阳性者175例,占87．5％,A组HBcAg阳性率55．0％（11/20）,B组53．8％（7/13）,C组75．0％（18/24）,D组96．6％（112/116）,E组100．0％（27/27）,HBcAg阳性率与血清HBV DNA水平之间呈显著正相关（r=0．80,P＜0．01）。血清HBV DNA水平高低与HBeAg阳性率之间呈显著正相关（r=0．47,P＜0．01）。其中20例HBV DNA阴性者中（A组）,HBeAg阳性者5例（25％）,HBcAg阳性者11例（55％）；15例HBV DNA阴性且HBeAg阴性者中有7例HBcAg阳性,占46．7％。结论CHB患者肝组织HBcAg阳性能更可靠地反映肝细胞内HBV复制状态。检测肝组织内HBcAg对CHB患者疗效评价和对治疗反应性的预测更具有临床意义。     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.     

一种新的HBeAg阴性慢性乙型肝炎病毒变异机制

Objective To investigate mutation patterns in core promoter(CP)region of hepatitis B virus(HBV).Methods HBV DNA was extracted from sera of patients with chronic HBV infection.The CP sequence was amplified by polymerase chain reaction(PCR)and cloned into pMD19 T vector.The positive clones were then sequenced.The sequences were compared with known HBV genome in GenBank to identify the mutation sites and patterns of patients with chronic HBV infection.Results There were 74 clones from 21 patients with chronic HBV infection which were sequenced.The sequence comparisons showed that there was a 234-nucleotide deletion in CP region of HBV genome in 54 clones and a 245-nucleotide deletion in one clone.These deletion regions included CP,HBeAg initiation codon and direct repeat sequence(DR)Ⅰ regions,which named CP deletion(CPD).A1585T replacement mutation was also found in HBV strain with CPD,which indicated that there was linkage between these two mutations.Conclusions A novel mechanism of HBeAg negative chronic hepatitis B is observed,which includes deletions of CP and HBeAg initiation codon.Meanwhile,a simple and useful PCR method is developed to detect CPD.