长沙地区呼吸道感染儿童Saffold心肌炎病毒的调查

目的了解长沙地区Saffold病毒（以下简称为SAFV）在儿童呼吸道感染中的流行情况,探讨其与儿童呼吸道感染的相关性。方法选取湖南省人民医院儿科医学中心2007年11月至2008年10月间643名因呼吸道感染住院儿童的鼻咽抽吸物。采用实时荧光定量聚合酶链式反应（Realtime．PCR）方法扩增SAFV的5UTR的基因片段,并且统计分析临床资料。结果643份样本中共检测出SAFV阳性67份,阳性检出率为10．42％（67／643）,5岁以上未检测出该病毒。31例患迁延性肺炎和慢性肺炎的患儿标本检出SAFV8例（25．81％）,差异有统计学意义。结论本研究表明长沙地区下呼吸道感染住院儿童存在SAFV感染;SAFV可能与下呼吸道感染及病程迁延相关。     

慢性肝炎和肝癌病人血清中乙型肝炎病毒DNA的检测

为了了解慢性肝炎和肝癌病人患者体内乙型肝炎病毒（ＨＢＶ）复制与ＨＢＶ血清标志之间的关系，用酶联免疫吸附实验（ＥＬＩＳＡ）、聚合酶链反应（ＰＣＲ）及斑点杂交方法对６１例慢性肝炎和４７例肝癌患者的ＨＢＶ表面抗原（ＨＢｓＡｇ）、相关ｅ抗原（ＨＢｅＡｇ）、表面抗体（抗－ＨＢｓ）、核心抗体（抗－ＨＢｃ）、相关ｅ抗体（抗－ＨＢｅ）进行了检测。结果表明：ＨＢＶＤＮＡ在ＨＢｓＡｇ、ＨＢｅＡｇ、／抗－ＨＢｃ阳性的慢性肝炎和肝癌患者血清中的检出率分别为９０．５０％和５０．００％；在ＨＢｓＡｇ／抗－ＨＢｅ、抗－ＨＢｃ阳性者的检出率分别为４５．４０％和７．１４％；在ＨＢｓＡｇ阳性、ＨＢｅＡｇ阴性／抗－ＨＢｅ阴性者中的检出率分别为６０．００％和４０．００％；ＨＢｓＡｇ阴性、／抗－ＨＢｃ阳性或／抗－ＨＢｅ阳性或／抗－ＨＢｓ阳性者中的检出率分别为２０．００％和２２．２２％；在血清学指标全阴性时，慢性肝炎和肝癌患者血清中ＨＢＶＤＮＡ的检出率均为０。实验提示：无论是肝炎或肝癌，在ＨＢｓＡｇ、ＨＢｅＡｇ同时阳性时，ＨＢＶ复制最为活跃；在单独ＨＢｓＡｇ阳性时，ＨＢＶ有一定程度的复制；ＨＢＶ复制在肝癌细胞中受到一定程度的抑制。     

慢性乙肝患者HBV核心基因一组单核苷酸多态性与血清HBV DNA水平的相关性研究

目的 研究慢性乙肝患者HBV核心基因的单核苷酸多态性(SNP)与血清HBV DNA水平的相关关系.方法 采用PCR-RFLP和限制性内切酶Tsp509I榆测HBV核心基因的SNP,采用双脱氧终止法对核心基因进行序列测定,实时荧光PCR技术用于HBVDNA水平的定量检测.结果 慢性乙肝人群中发现5种典型的PCR-RFLP图谱,分别是RFLP-C、RFLP-D、RFLP-E、RFLP-G和RFLP-C/G,各种RFLP图谱的分布频率依次为61.5%、2.6%、9.6%、16.7%和9.6%.A165T、A336C、A336T、T337C和T385C等5种SNP与RFLP图谱的变化有关,但是只有SNP A336C和A336T会导致HBcAg第83位的Glu被Asp所替代.RFLP-C组患者的血清HBV DNA水平显著高于RFLP-G组(P=0.02)和RFLP-C/G组(P=0 006),而且RFLP-C/G组患者血清ALT的阳性率显著低于RFLP-C、RFLP-E和RFLP-G组;当HBeAg阳性时,RFLP-C组患者的血清HBV DNA水平显著高于RFLP-G组(P=0.015)和RFLP-C/G组(P=0.008).结论 本研究中使用的PCR-RFLP能够用于检测核心基因的SNP,RFLP-C组患者的血清HBV DNA水平显著高于RFLP-G组和RFLP-C/G组,可能与Glu83 Asp突变有关.

Abstract：

Objective To investigate the relation between a set of single nucleotide polymorphisms (SNP) in core gene of HBV in chronic hepatitis B patients and HBV DNA levels. Methods PCR restriction fragment length polymorphism(PCR-RFLP) assay and restriction enzyme Tsp509I were adopted to determine HBV SNP in HBV core gene. Nucleotide sequences of core gene were determined using the dideoxy chain termination method. HBV DNA levels were quantitated with real-time PCR. Results Five typical RFLP patterns, RFLP-C, RFLP-D, RFLP-E, RFLP-G and RFLP-C/G mixture were found and the distribution of HBV RFLP patterns was as follows: C, 61. 5% ; D, 2. 6% ; E, 9.6%; G, 16.7%; C/G mixture, 9.6%. Five SNPs, A165T, A336C, A336T, T337C and T385C, were found to be associated with RFLP patterns change and only SNP A336C or A336T caused the substitution of Glu-83 with Asp in HBcAg. The serum HBV DNA levels in RFLP-C group were higher than that in RFLP-G (P =0. 02) and RFLP-C/G group(P = 0. 006) , respectively, furthermore, the positive rate of serum ALT in RFLP-C/G group was lower than that in RFLP-C, RFLP-E and RFLP-G group, respectively. Under the condition of HBeAg-positive, the serum HBV DNA levels in RFLP-C group were higher than that in RFLP-G (P = 0. 015) and RFLP-C/G group(P =0.008) , respectively. Conclusion PCR-RFLP used in this study can be adopted to determine HBV SNPs, not genotypes in Chinese patients with chronic hepatitis B. The serum HBV DNA level in RFLP-C group higher than that in RFLP-G or RFLP-C/G group maybe associated with amino acid mutation, Glu83 Asp.