CN105671188B - 用于诊断结核分枝杆菌感染的分子标志物、引物组及应用 - Google Patents

用于诊断结核分枝杆菌感染的分子标志物、引物组及应用 Download PDF

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CN105671188B
CN105671188B CN201610213403.3A CN201610213403A CN105671188B CN 105671188 B CN105671188 B CN 105671188B CN 201610213403 A CN201610213403 A CN 201610213403A CN 105671188 B CN105671188 B CN 105671188B
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曾谷城
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Ruiwei (Shenzhen) Biotechnology Co., Ltd
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Abstract

本发明供用于诊断结核分枝杆菌感染的新型分子标志物,分子标志物选自序列如SEQ ID NO.1~28所示的RNA中的一种或两种以上的组合;或者,选自与SEQ ID NO.1~28所示的任何其中一种RNA的片段具有相同序列或者>50%相同序列的RNA;或者是与SEQ ID NO.1~28所示的任何其中一种RNA全长或片段具有>50%的RNA序列相似性的人工合成、拼接、重组或克隆的RNA。本发明还提供上述分子标注物的特异性引物组,及提供上述分子标志物及引物组的应用。序列如SEQ ID NO.1~28所示的RNA可以作为判别是否被结核分枝杆菌感染的特异分子标志物或诊断靶点,可应用于制备用于诊断结核分枝杆菌感染的制剂中。

Description

用于诊断结核分枝杆菌感染的分子标志物、引物组及应用
技术领域
本发明属于生物技术领域,特别涉及用于诊断结核分枝杆菌感染的分子标志物及在结核分枝杆菌感染诊断中的应用。
背景技术
结核病(Tuberculosis,TB)是因结核分枝杆菌(Mycobacterium tuberculosis,Mtb)感染引起的一种“高感染率”、“高致病率”与“高致死率”烈性传染病。2015年世界卫生组织(WHO)发布的世界结核年报显示,结核病的年致死人数达到150万,已经超过因艾滋病或HIV感染所致死人数。中国是全球结核分枝杆菌携带人数最多、活动性结核病人最多以及结核耐药疫情最为严重的国家之一。所以,迅速控制结核疫情蔓延迫在眉睫。
早期、快速、便捷诊断结核是控制结核病的一个关键环节。只有早期、快速、便捷、准确诊断出是否被结核分枝杆菌感染,才能为临床治疗用药提供依据,才能为结核病控制部门采取及时、快速的公共卫生防控措施提供决策依据。
目前的结核分枝杆菌感染诊断技术主要包括有细菌学诊断与免疫学诊断。其中细菌学诊断包括结核分枝杆菌痰涂片抗酸染色、结核分枝杆菌培养、及痰标本的结核分枝杆菌特异核酸PCR检测等。但是,基于痰标本抗酸染色、培养、PCR的结核分枝杆菌细菌学诊断技术严重依赖于结核病人排出的痰液里面必须有结核分枝杆菌。然而,有>50%的结核感染病人因不排痰或者排的痰里面不含结核分枝杆菌所以无法在痰液里面检测到结核分枝杆菌,而且结核分枝杆菌不仅培养周期非常漫长,往往需要3~6周,而且培养要求高。所以,结核分枝杆菌感染的细菌学诊断技术具有很大的局限性,存在诊断效率低、周期长、灵敏度低、技术复杂等缺陷,而且无法适用于临床约>50%的痰标本结核分枝杆菌阴性结核病人的诊断。
结核的免疫学诊断技术主要包括结核菌素皮试(TST)与IFN-γ释放的ELISA或者ELISPOT检测。结核菌素皮试(TST)的主要优点是价格相对低廉、适宜大规模结核感染人群的结核筛查。但是,结核菌素皮试(TST)的诊断缺乏结核分枝杆菌特异性,而且结核菌素皮试(TST)的结果非常容易受到机体免疫力与生理状态的非特异性干扰。所以结核菌素皮试(TST)存在诊断特异性差、灵敏度低的致命缺点。基于结核分枝杆菌特异的IFN-γ释放的ELISA或者ELISPOT检测的结核免疫学诊断技术相比结核菌素皮试(TST)诊断技术有更高的特异性。但是,基于结核特异的IFN-γ释放ELISA或者ELISPOT检测的结核免疫学诊断技术需要专业的细胞培养实验室对受试者的细胞进行培养,细胞培养实验周期长,ELISPOT的数据读出需要专业、昂贵的ELISPOT斑点读出仪器,总体诊断价格昂贵,不适用于基层的结核早期、快速诊断,也不适合婴幼儿的结核诊断。而且,大量的结核病人处于免疫抑制或紊乱状态,IFN-γ的表达受到抑制或者处于紊乱的状态,所以,基于结核特异的IFN-γ释放的结核诊断技术存在技术上天然的缺陷。
因此,发现新的结核特异的诊断生物标记物,开发灵敏、方便、快捷、特异性高并且廉价的结核诊断新技术就成为了控制结核疫情蔓延的重要工作。
发明内容
为弥补现有技术的不足,本发明第一方面提供用于诊断结核分枝杆菌感染的新型分子标志物,所述分子标志物选自序列如SEQ ID NO.1~28所示的RNA中的一种或两种以上的组合。
或者,所述分子标志物选自与SEQ ID NO.1~28所示的任何其中一种RNA的片段具有相同序列或者>50%相同序列的RNA;或者所述分子标志物是与SEQ ID NO.1~28所示的任何其中一种RNA全长或片段具有>50%的RNA序列相似性的人工合成、拼接、重组或克隆的RNA。
本发明第二方面提供上文所述的分子标志物在制备用于诊断结核分枝杆菌感染的制剂中的应用。作为一种具体方式,该制剂通过检测被试者末梢血、外周血、外周血血清或外周血单个核细胞(PBMC)中所述分子标志物的含量,并与正常水平相比较来诊断被试者是否被结核分枝杆菌感染。进一步具体的,可通过实时定量PCR或基因芯片来检测判别被试者是否被结核分枝杆菌感染。
本发明第三方面提供一种引物组,该引物组包括分别用于特异性扩增序列如SEQID NO.1~28所示的RNA的引物对中的至少一种引物对或两种以上引物对的组合,其中,用于特异性扩增序列如SEQ ID NO.1~5、7-17、19-24、26-28所示的RNA的引物对分别依次为引物对1~5、7-17、19-24、26-28,用于特异性扩增序列如SEQ ID NO.6的RNA的引物对为引物对6a或6b,用于特异性扩增序列如SEQ ID NO.18的RNA的引物对为引物对18a或18b,用于特异性扩增序列如SEQ ID NO.25的RNA的引物对为引物对25a或25b。引物对可以是天然的或是合成的。
本发明第四方面提供上述引物组在制备用于诊断结核分枝杆菌感染的制剂中的应用。
本发明第五方面提供一种用于诊断结核分枝杆菌感染的制剂,该制剂包括分别用于特异性扩增序列如SEQ ID NO.1~28所示的RNA的引物对中的至少一种引物对、或两种以上引物对的组合。进一步,用于特异性扩增序列如SEQ ID NO.1~5、7-17、19-24、26-28所示的RNA的引物对分别依次为上文所述的引物对1~5、7-17、19-24、26-28,用于特异性扩增序列如SEQ ID NO.6的RNA的引物对为引物对6a或6b,用于特异性扩增序列如SEQ ID NO.18的RNA的引物对为引物对18a或18b,用于特异性扩增序列如SEQ ID NO.25的RNA的引物对为引物对25a或25b。该制剂可以是试剂盒或基因芯片等。
本发明第六方面提供一种用于诊断结核分枝杆菌感染的制剂,该制剂包括:1)外周血单个核细胞(PBMC)的总RNA提取试剂;2)逆转录试剂;3)实时定量PCR试剂;其中,所述实时定量PCR试剂包括用于特异性扩增序列如SEQ ID NO.1~28所示的RNA的引物对中的至少一种引物对、或两种以上引物对的组合。进一步优选的,用于特异性扩增序列如SEQ IDNO.1~5、7-17、19-24、26-28所示的RNA的引物对分别依次为上文所述的引物对1~5、7-17、19-24、26-28,用于特异性扩增序列如SEQ ID NO.6所示的RNA的引物对为引物对6a或6b,用于特异性扩增序列如SEQ ID NO.18所示的RNA的引物对为引物对18a或18b,用于特异性扩增序列如SEQ ID NO.25所示的RNA的引物对为引物对25a或25b。该制剂中的外周血单个核细胞的总RNA提取试剂和逆转录试剂均可采用本领域现有的相应试剂,如逆转录试剂采用Thermo公司的逆转录试剂盒,总RNA提取试剂采用Trizol法提取RNA所需的常用试剂。该制剂可以是试剂盒等。
经实验证实,本发明所述的序列如SEQ ID NO.1~28所示的RNA在被结核分枝杆菌感染的结核病患者中的表达量明显低于或高于未被结核分枝杆菌感染的健康人,因而,所述的序列如SEQ ID NO.1~28所示的RNA可以作为判别是否被结核分枝杆菌感染的特异分子标志物或诊断靶点,可应用于制备用于诊断结核分枝杆菌感染的制剂中。采用本发明的分子标志物开发诊断结核分枝杆菌感染的制剂,用于诊断结核分枝杆菌感染,具有灵敏、方便、快捷、特异性高、廉价的特点。
附图说明
图1:为序列如SEQ ID NO.1~8、10~17所示的RNA在结核分枝杆菌感染的结核病患者或未被结核分枝杆菌感染的健康人群的人外周血单个核细胞(PBMC)中差异表达的实时定量PCR结果图;
图2:为序列如SEQ ID NO.18~25、27~28所示的RNA在结核分枝杆菌感染的结核病患者或未被结核分枝杆菌感染的健康人群的人外周血单个核细胞(PBMC)中差异表达的实时定量PCR结果图。
图3:为序列如SEQ ID NO.9、26所示的RNA在结核分枝杆菌感染的结核病患者或未被结核分枝杆菌感染的健康人群的人外周血单个核细胞(PBMC)中差异表达的实时定量PCR结果图。
具体实施方式
下面结合附图和实施例对本发明的技术方案做进一步说明:
实施例
本实施例将人群分为两个组:结核分枝杆菌感染的结核病患者(27例,简写为TB组)、未被结核分枝杆菌感染的健康人群(26例,简写为Healthy组);通过实时定量PCR检测每例外周血单个核细胞(PBMC)中28种RNA(其序列如SEQ ID NO.1-28所示)的表达情况,发现结核分枝杆菌感染的结核病患者中上述28种RNA的表达水平总体明显低于或高于未被结核分枝杆菌感染的健康人群。具体步骤如下:
步骤一:外周血单个核细胞(PBMC)悬液的制备:
取肝素抗凝静脉血3ml与等量的磷酸缓冲液(PBS)充分混匀得混合液;另取离心管,加入等量的淋巴细胞分离液;用吸管将上述混合液沿着离心管管壁缓慢叠加于淋巴细胞分离液液面上,保持液面清楚;水平离心,1500rpm×20分钟,用吸管小心吸取中间白膜层于新的离心管中,加入5倍体积的PBS,1500rpm×10分钟洗涤细胞两次,末次离心去除上清,加入含10%(v/v)胎牛血清的RPMI1640,重悬细胞,每例取10微升进行计数。
步骤二:RNA提取
采用Trizol法提取RNA,具体操作:将上述细胞悬液吸入离心管中,8000g 4℃离心2分钟,弃上清,注意不要破坏细胞沉淀;向每管中加入1ml的Trizol,用加样枪反复吹打至无明显沉淀,室温静置5分钟;向匀浆裂解液中加入氯仿(Trizol的五分之一体积),混匀至溶液成乳白色,室温静置5分钟;12000g 4℃离心15分钟,分三层,吸取上清到新的离心管中;向上清中加入二分之一Trizol体积的异丙醇,上下颠倒混匀,室温静置10分钟,12000g4℃离心10分钟;弃上清,加入Trizol等量的75%(v/v)的乙醇,轻轻上下颠倒清洗管壁,7500g 4℃离心5分钟后,弃上清;打开离心管盖,室温干燥几分钟,加入20~100微升的RNase-free水溶解沉淀。于-80℃保存待用。
步骤三:逆转录
采用Thermo公司的逆转录试剂盒,逆转录反应体系配制在冰上进行,具体如下表1:
Figure BDA0000959987790000041
Figure BDA0000959987790000051
按上述表1中配好反应体系,放入普通PCR反应仪器内,程序为25℃5min→42℃60min→70℃5min,反应结束后放4℃保存。
步骤四:荧光定量PCR反应
采用Kapa Biosystems公司的荧光定量PCR试剂盒,反应体系如下表2:
Figure BDA0000959987790000052
按照表2来配制反应体系,使用Bio-Rad IQ5仪器进行实时定量PCR反应。
实时定量PCR反应的扩增标准程序:95℃3分钟;之后95℃3秒,60℃30秒,40个循环。
以GAPDH基因为内参基因。设计用于特异性扩增28种RNA(序列如SEQ ID NO.1-28所示)的引物,以及GAPDH基因的特异性扩增引物。其中,分别用于特异性扩增序列如SEQ IDNO.1-28所示的RNA或基因的引物对序列如下表3所示(引物由华大基因合成),其中用于特异性扩增序列如SEQ ID NO.6所示的RNA的引物对可为引物对6a或6b,用于特异性扩增序列如SEQ ID NO.18所示的RNA的引物对可为引物对18a或18b,用于特异性扩增序列如SEQ IDNO.25所示的RNA的引物对可为引物对25a或25b。表3中,引物对序号为1的引物对称为引物对1,序号为2的引物对称为引物对2,以此类推。
表3
Figure BDA0000959987790000053
Figure BDA0000959987790000061
Figure BDA0000959987790000081
特异性针对内参基因GAPDH基因的引物序列如下:
Figure BDA0000959987790000082
Figure BDA0000959987790000091
根据实时定量PCR的结果,使用GraphPad Prism5对TB组与Healthy组进行studentt-test统计差异分析,P值<0.05表示具有统计学差异,以GAPDH基因为内参基因,采用delta CT方法来计算出结核病人相对健康人群的各个RNA的表达量,结果如图1~3(图1-3中各图左上角的数字和序列表中所对应RNA的序列编号对应)所示,横坐标表示实验组名称,纵坐标表示基因相对表达量。
从图1~2中可知,结核分枝杆菌感染的结核病患者的PBMC中的对应于序列如SEQID NO.1~8、10~25、27~28所示的RNA的表达水平总体显著低于未被结核分枝杆菌感染的健康人群。从图3可知,结核分枝杆菌感染的结核病患者的PBMC中的对应于序列如SEQ IDNO.9、26所示的RNA的表达水平显著高于未被结核分枝杆菌感染的健康人群。
上述实验证实,本发明的序列如SEQ ID NO.1~28所示的RNA在被结核分枝杆菌感染的结核病患者中的表达量明显低于或高于未被结核分枝杆菌感染的健康人,因而,所述的序列如SEQ ID NO.1~28所示的RNA可以作为判别是否被结核分枝杆菌感染的特异分子标志物或诊断靶点,这些分子标志物及其特异性引物可应用于制备用于诊断结核分枝杆菌感染的制剂中。
文中所用的试剂若未特别说明均为市场购买获得,文中未特别说明之处均为本领域技术人员根据其掌握的公知常识或常规技术手段所能理解或知晓,不再一一赘述。
以上所述,仅是本发明的较佳实施例而已,并非对本发明做任何形式上的限制,故凡未脱离本发明技术方案的内容,依据本发明的技术实质对以上实施例所做的任何简单修改、等同变化与修饰,均仍属于本发明技术方案的范围内。
Figure IDA0000959987890000011
Figure IDA0000959987890000021
Figure IDA0000959987890000061
Figure IDA0000959987890000071
Figure IDA0000959987890000091
Figure IDA0000959987890000101
Figure IDA0000959987890000111
Figure IDA0000959987890000121
Figure IDA0000959987890000131
Figure IDA0000959987890000141
Figure IDA0000959987890000151
Figure IDA0000959987890000171
Figure IDA0000959987890000181
Figure IDA0000959987890000191
Figure IDA0000959987890000201
Figure IDA0000959987890000211
Figure IDA0000959987890000241
Figure IDA0000959987890000251
Figure IDA0000959987890000261
Figure IDA0000959987890000271
Figure IDA0000959987890000291
Figure IDA0000959987890000301
Figure IDA0000959987890000311
Figure IDA0000959987890000321
Figure IDA0000959987890000331
Figure IDA0000959987890000341
Figure IDA0000959987890000351
Figure IDA0000959987890000361
Figure IDA0000959987890000371
Figure IDA0000959987890000381
Figure IDA0000959987890000391

Claims (2)

1.分子标志物在制备用于诊断结核分枝杆菌感染的制剂中的应用,其特征在于,所述分子标志物的序列如SEQ ID NO.1所示。
2.引物组在制备用于诊断结核分枝杆菌感染的制剂中的应用,其特征在于,所述引物组包括引物对1,所述引物对1的碱基序列如下所示:
Figure FDA0002282074390000011
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