抗HSV糖蛋白单克隆抗体可变区基因的克隆和序列测定

选用具有动物体内高保护作用的抗ＨＳＶ－１／ＨＳＶ－２型共同性糖蛋白Ｃ（ｇＣ）单克隆抗体１Ａ１２，从其杂交瘤细胞中提取总ＲＮＡ，以Ｏｌｉｇｏ（ｄＴ）１５为引物反转录合成ｃＤＮＡ，用一对鼠抗体通用ＶＨ引物和一对Ｖ引物进行ＰＣＲ，扩增出１Ａ１２ＶＨ和１Ａ１２ＶＬ基因，并分别克隆入ｐＵＣ１８质粒中，序列分析结果表明，１Ａ１２ＶＨ基因由３３６ｂｐ组成，编码１１２个氨基酸，隶属于小鼠重链第３组亚组（Ｄ）；１Ａ     

不同引物介导的聚合酶链反应检测人乳头瘤病毒DNA

应用３对人乳头瘤病毒（ＨＰＶ）引物对１０７例各种宫颈标本进行了聚合酶链反应（ＰＣＲ）扩增。结果显示，共同引物（ＧＰ）扩增，有５８．８％（３０／５１）宫颈鳞癌，１００％（１４／１４）尖锐湿疣、１３．６％（３／２２）宫颈炎和１０％（２／２０）正常宫颈出现ＨＰＶ阳性。型特异性引物ＳＰ１６／ＳＰ１８扩增，有３７．２％（１９／５１）宫颈鳞癌２５．７％（５／１４）尖锐湿疣和５％（１／２０）正常宫颈出现ＨＰＶ１６型阳性，５．８％（３／５１）宫颈鳞癌为ＨＰＶ１８型阳性。进一步用ＳＰ１６ｂ引物扩增，没有１例ＨＰＶ１６ｂ亚型被发现。说明宜颈磷癌和尖锐湿疣与ＨＰＶ感染有关，结合应用共同引物和型特异性引物可作为ＨＰＶ检测与分型方法。     

编码HIV-1 Pr42~(gag)的杆状病毒转移载体的构建及鉴定

本文作者采用聚合酶链式反应（ＰＣＲ），从ＨＩＶ－１ｃＤＮＡ克隆ＢＨ１０中扩增出Ｐｒ４２ｇａｇ的基因片段，经适当的限制性内切酶消化后插入到杆状病毒转移载体ｐＢａｃＰＡＫ９中，使其处于多角蛋白启动子的控制之下，构成重组转移载体ｐＢａｃＧＡＧ４２。酶切鉴定结果与预期的一致。再用载体上多克隆位点两翼的引物对连接处进行序列分析，结果表明外源基因处于多角蛋白启动子的控制下，且成功地引入了起始码和终止码。     

编码HIV—1 Pr42^gag的杆病毒转移载体的构建及鉴定

本文作者采用聚合酶链式反应（ＰＣＲ），从ＨＩＶ－１ ｃＤＮＡ克隆ＢＨ１０中扩增出Ｐｒ４２＾ｇａｇ的基因片段，经适当的限制性内切酶消化后插入到杜状病毒转移载体ｐＢａｃＰＡＫ９中，使其处于多角蛋白启动子的控制之下，构成重组转移载体ｐＢａｃＧＡＧ４２。酶切鉴定结果号预期的一致。再用载体上多克隆位点两翼的引物对连接处进行序列分析，结果表明外源基因片于多角蛋白启动子的控制下，且成功地引入了起始码和终止码。     

IL—2／HBV PreS融合基因的克隆及序列测定

目的：获得ＩＬ－２／ＨＢＶｐｒｅＳ融合基因克隆，为表达ＩＬ－２／ＨＢＶｐｒｅＳ融合蛋白奠定基础，方法：用ＰＣＲ方法从乙肝全序列中扩增ＨＢＶｐｒｅＳ基因片段，并克隆入带ＩＬ－２基因的ｐｌｙ５质粒中，挑出的阳性克隆再亚克隆到ｐＵＣ１８中进行序列测定。结果：基因全长９３０ｂｐ，编码３１０个氨基酸，序列内有起始码和终止码。结论：所克隆的基因为ＩＬ－２与ＨＢＶｐｒｅＳ的融合基因。     

人乳头状瘤病毒感染与食管癌的关系

人类乳头状瘤病毒（ＨＰＶ）的感染是上皮性肿瘤发生的一个重要原因。特别是ＨＰＶ１６和ＨＰＶ１８型感染与宫颈癌的发生。但ＨＰＶ的感染与食管癌的关系仍不清楚。我们采用免疫组织化学和敏感的ＨＰＶ共同引物、ＨＰＶ１６和ＨＰＶ１８型特异性引物的ＰＣＲ方法及３２Ｐ标记特异性探针Ｓｏｕｒｈｅｒｎ杂交检测食管癌中的ＨＰＶ及其亚型。结果显示，１２７例食管鳞癌标本免疫组化方法检测，ＢＰＶ阳性者占６０．６（７７／１２７），ＨＰＶＥ６蛋白抗原阳性者占４３％（５４／１２７）。其阳性染色明确定位于鳞癌组织内，并与肿瘤的分化有着密切的关系。经β球蛋白引物扩增证实不含ＰＣＲ抑制标本共１０３例，其中ＨＰＶ共同引物ＰＣＲ扩增阳性者为３７例，占３５．９％，经型特异ＰＣＲ及Ｓｏｕｔｈｅｒｎ杂交证实其中ＨＰＶ１６阳性者２１例，占２０．４％；ＨＰＶ１８阳性者８例，占７．８％。仅一例为ＨＰＶ１６和１８均阳性。以上结果显示ＨＰＶ感染的确存在于食管癌中，并可能在食管癌发生中起一定的作用。     

抗HSVgc单克隆抗体V_2基因的扩增、克隆及序列测定

本文从分泌具有高中和活性和高保护作用的抗ＨＳＶ－１／ＨＳＶ－２型共同性糖蛋白Ｃ的鼠源性单克隆抗体（ＭｃＡｂ）的杂交瘤细胞１Ａ１２中提取胞浆总ＲＮＡ，以Ｏｌｉｇｏ（ｄＴ）１５为引物逆转录合成ｃＤＮＡ，用一对鼠抗体Ｋ链通用引物进行ＰＣＲ，扩增出１Ａ１２ＶＬ基因，并克隆入ｐＵＣ１８质粒中。序列分析结果表明，１Ａ１２ＶＬ基因由３３０ｂｐ组成，编码１１０个氨基酸，隶属小鼠轻链ｋ链４组。     

双重引物聚合酶链反应同时检测人乳头瘤病毒及沙…

本研究于国内首次建立了人乳头病毒／沙眼衣原体两对引物ＰＣＲ技术，即ＨＰＶ／ＣＴ双重经物ＰＣＲ。将设计在人乳头瘤病毒（Ｈｕｍａｎｐａｐｉｌｌｏｍａｖｉｒｕｓ，ＨＰＶ）１６型早期基因Ｅ１保守区的一对共有引物和设计在沙眼衣原体（Ｃｈｌａｍｙｄｉａｔｒａｃｈｏｍａｔｉｓ，ＣＴ）隐蔽质粒区的一对引物同时加入同一反应体系，一次反应可同时检出泌尿生殖道标本中存在的ＨＰＶ和ＣＴ的单独或混合感染，对设计的两对引物做     

乌鲁木齐市部分高危人群庚型肝炎病毒感染现状及5′ UTR区基因序列分析

新疆地处我国西部边陲 ,存在着各型肝炎散发流行的危险因素 ,庚型肝炎病毒在乌鲁木齐市的流行现状尚未见报道。在新疆医科大学第一附院收集了2 67份各类人群的血清 ,用酶标法检测血清中庚型肝炎病毒抗体 (抗 ＨＧＶ) ,再以庚型肝炎病毒ＮＳ3区为引物运用ＲＴ ＰＣＲ法对抗 ＨＧＶ(阳性 )血清进行庚型肝炎病毒核酸 (ＨＧＶＲＮＡ)的扩增检测 ,阳性扩增产物为 83ｂｐ。最后 ,选择该病毒 5′非编码区为引物对第一次ＲＴ ＰＣＲ扩增ＨＧＶＲＮＡ(阳性 )血清 ,再次进行163.ｃｏｍ)ＲＴ ＰＣＲ扩增 ,阳性扩增产物为 1 90ｂｐ ,对第二次扩增ＨＧＶ…     

抗人Lp(a)单链抗体基因的构建及序列测定

目的 构建鼠抗人脂蛋白（Ｌｐ）（ａ）单链抗体（ＳｃＦｖ）基因。方法 在从分泌高亲和力的抗人Ｌｐ（ａ）单克隆抗体的杂交瘤细胞株中提取细胞的总ＲＮＡ，以随机引物反转录合成ｃＤＮＡ，以特异引物进行ＰＣＲ，扩增单抗的ＶＨ和ＶＬ基因。采用限制性内切酶酶切拼接法，并按ＶＨ－Ｌｉｎｋｅｒ－ＶＬ的结构，将ＶＬ和ＶＨ基因拼接成单链抗体基因，并进行序列分析。结果 拼接成的ＳｃＦｖ基因长度约为７３０ｂｐ。结论 所构建的     

HLA—A2单抗轻链可变区基因的克隆及其序列分析

以ＨＬＡ－２单抗ｍＲＮＡ为模板，设计了３对特异性引物，采用ＰＣＲ技术，扩增和克隆出单以链可变区基因并应用双脱氧链式终止法及计算机基因文库测定和分析了其氨基酸和核苷酸序列。结果证明，本组单抗轻链由不同的基因家族编码。     

9.1C3单链抗体的基因构建及序列分析

本文在已克隆９．１Ｃ３抗体ＶＨ和Ｖｋ基因的基础上，用一编码疏水性多肽接头的ＤＮＡ，经重叠延伸拼接ＰＣＲ，构建了９．１Ｃ３单链抗体基因。经测序表明，ＶＨ、Ｖｋ及Ｌｉｎｋｅｒ的序列均正确，为９．１Ｃ３单链抗体的表达奠定了基础。     

在昆虫细胞中表达HSV糖蛋白单域抗体的重组杆状病毒的构建

设计一对含EcoRⅠ—起始码和终止码—SalⅠ的鼠抗体V_H引物,用PCR法对重组质粒p1A12V_H中插入基因1A12V_H进行突变,突变的PCR产物的序列测定表明,在1A12V_H基因两端成功地插入了EcoRⅠ—起始码和终止码—SalⅠ。将突变后1A12V_H依次克隆入pSL301质粒和pAcEEUL8质粒中,使ⅠA12V_H基因两端均接上BamHⅠ接头,用BanHⅠ酶切,将1A12V_H基因克隆入杆状病毒表达载体pAcCL29质粒的多角体基因中的唯一BamHⅠ切点处,经计算机分析,用BamHI;EcoRV/EcoRⅠ;SalⅠ三组酶切,筛选出克隆的1A12V_H基因方向与多角体启动子基因方向一致的重组杆状病毒转基因质粒pAc1A12V_H。CsCL—EB梯度平衡离心法纯化pAc1A12V_H,转化AcNPV基因组DNA,然后转染的sf9细胞,空斑筛选和纯化1A12V_H—AcNPV重组杆状病毒,并用PCR法作进一步鉴定。     

人源性抗HBs可变区单链抗体基因的构建及核酸序列测定

将通过噬菌体显示技术获得的一株人源性抗HBs Fab抗体基因重链和k轻链的可变区用编码柔性肽的Linker使其连接成单链,克隆入中间载体,并进行核酸序列测定,为其后的表达及双功能抗体的构建打下基础。     

人骨形态发生蛋白-2完整成熟肽基因的克隆

目的：克隆人骨形态发生蛋白－２（ｈＢＭＰ－２）完整肽基因。方法：依据Ｇｅｎｂａｎｋ中ｈＢＭＰ－２的序 化学合成两条引物,从人胎儿骨组织中提取得到的总ＲＮＡ中,通过反转录聚合酶链式反应（ＲＴ－ＰＣＲ）得到ｈＢＭＰ－２完整成熟肽基因。将所得的基因片段插入克隆载体ｐＵＣ－１９并转化大肠杆菌ＪＭ１０９,提取重组质粒,酶切并测序。结果：ＤＮＡ琼脂糖凝胶电泳显示：ＰＣＲ产物为一长约４００ｂｐ的带,阳性克隆质粒     

抗人HBsAg单链抗体基因的构建及其在COS-7细胞中的表达

目的：构建抗人HBsAg单链抗体基因，并分析其在COS—7细胞中的表达。方法：以从噬菌体抗体库中筛选的抗HBsAg的Fab抗体基因为模板，分别扩增其轻、重链可变区(VL、VH)基因，通过重组PCR方法将轻、重链可变区基因用连接肽(C1y4Ser)3的编码序列连接，并引入前导肽编码序列，构建具有L—VH—Linker—Vl结构的单链抗体基因。将所构建的单链抗体基因克隆入绿色荧光蛋白(GFP)融合表达载体pEGFP—N3，并转染COS—7细胞进行表达。结果：经测序表明，前导肽、连接肽、VL及Vh的序列正确。酶切鉴定证实，成功地构建了GFP基因融合表达载体。瞬时转染COS—7细胞后，通过荧光显微镜观察证实有ScFv融合蛋白的表达。转染细胞的培养上清浓缩后，进行SDS—PAGE及westem blot分析，可检出ScFv融合蛋白的分泌性表达。培养上清的间接ELISA检测证实，所表达的单链抗体具有与HBsAg结合的特异性。结论：成功地构建了抗人HBsAg单链抗体基因，并可在COS—7细胞中分泌性表达。     

Use of family specific leader region primers for PCR amplification of the human heavy chain variable region gene repertoire.

We have designed a set of six, non-degenerate oligonucleotide primers, corresponding to the 5' leader regions of each of the six human VH gene families. A general strategy for family specific polymerase chain reaction amplification is described using these primers and a conserved 3' primer corresponding to frame work 3, JH, or constant region. This strategy was used to isolate and sequence novel human germline VH genes belonging to the VH2 and VH4 families. Under certain conditions, chimeric VH sequences were created by a "jumping polymerase chain reaction", combining DNA segments from different germline genes, but this could be avoided by limiting the number of amplification cycles. PCR amplification with these family specific primers will facilitate studies of the repertoire of germline VH genes as well as studies on VH gene usage in normal and aberrant (B cell malignancies, autoimmune diseases, etc.) B cell populations.     

Anti-fluorescein antibody 3-13 VH gene rearrangement in idiotypically cross-reactive hybridomas

The deduced amino acid sequence of anti-fluorescein (F1) antibody 3-13 VH region (residues 1-95) was 78% homologous to the alpha-1----3-dextran binding myeloma protein J558 VH region and was in the Wu-Kabat Subgroup II or Dildrop Group I classifications. The 3-13 VH region was rearranged to a D segment with only 8 of 30 bp in common with DFL16.1 germ line D gene and less homologous to all other previously identified D sequences. This sequence was joined to the third codon of JH4. The sequence encoding VH residues 5-91 was subcloned into pSP65 and used as a probe in Southern analyses to monitor 3-13 VH gene rearrangements in 12 other anti-F1 hybridomas differentially expressing (or not at all) the 3-13 idiotype. Three clones which inhibited the 3-13 idiotype-anti-idiotype interaction as effectively as 3-13 (3-12, 3-17 and 3-35), all had rearranged a gene which hybridized to the cloned 3-13 fragment, however, each was contained on a different size restriction fragment. Analyses of five other idiotypically related (but not identical) hybridomas indicated that four had rearranged a cross hybridizing VH gene while no such rearrangements were detected among four idiotypically negative cell lines. A restriction site assay indicated five clones examined had all rearranged a Vk gene to the Jk1 or Jk2 gene segment. The sequence of the antibody 3-13 VH gene and its use in hybridization studies represent the first molecular analysis of a recurrently expressed repertoire specific idiotype within an unrestricted immune response.     

Somatically mutated IgG anti-DNA antibody clonally related to germ-line encoded IgM anti-DNA antibody.

Among 15 anti-DNA antibody-producing hybridomas derived from a single NZB X NZW F1 mouse, an IgM and an IgG were shown to use the same VH gene of the Q52 family. Using a combination of two primers both consisting of a mixture of oligonucleotides (one complementary to the 5' end of VH segment and one to the 3' end of VH segment of Q52 family) we determined the sequences of several members of germ-line VH genes in the Q52 family derived from NZB and NZW strains. Comparison of the sequences with those of cloned VH cDNA obtained from the hybridomas revealed that the VH sequence of the IgM anti-DNA antibody was identical to that of a cloned NZW germ-line VH gene, except for the priming sites. In contrast, the VH sequence of the IgG counterpart contained somatically mutated nucleotides. Because the IgG anti-DNA antibody showed a higher DNA binding activity than did the IgM antibody, we conclude that these changes in nucleotide sequences were induced and selected through an antigen-driven mechanism as is the case in a normal immune response. It is tempting to speculate that the germ-line encoded, low-affinity IgM autoantibody undergoes somatic mutations and isotype switching, resulting in generation of pathogenic, high-affinity autoantibodies in autoimmune diseases.     

Two-step polymerase chain reactions and restriction endonuclease analyses detect and differentiate ompA DNA of Chlamydia spp.

Specific and sensitive amplification of major outer membrane protein (MOMP) gene (ompA) DNA sequences of Chlamydia species with various MOMP genotypes was achieved by a two-step polymerase chain reaction (PCR). Degenerate, inosine-containing oligonucleotide primers homologous to the 5' and 3' ends of the translated regions of all chlamydial MOMP genes were used in a PCR to amplify a DNA fragment of approximately 1,120 bp. A portion of this DNA fragment was amplified in a second genus-specific reaction that yielded a DNA fragment of approximately 930 bp. A pair of degenerate oligonucleotide primers homologous to internal sequences of the primary DNA fragment was used in this PCR. This method detected three cognate chlamydial genomes in a background of 1 microgram of unrelated DNA. MOMP genes of 13 representative chlamydial MOMP genotypes of the species C. trachomatis, C. pneumoniae, and C. psittaci were amplified. In a secondary PCR, group-specific detection was achieved by the simultaneous use of one genus-specific primer and three primers derived from different fingerprint regions of three major groups of chlamydiae. This multiplex PCR differentiated the groups by the length of the amplified DNA fragments and detected the simultaneous presence of DNA sequences of the Chlamydia spp. with different MOMP genotypes. Further differentiation as ompA restriction fragment length polymorphism types among all chlamydial strains with the various MOMP genotypes analyzed here was achieved by restriction endonuclease analysis of the secondary PCR products. DNA sequences corresponding to the ompA restriction fragment length polymorphism type B577 of C. psittaci were detected in two of seven milk samples from cases of bovine mastitis.