CN104388582A - A型通用流感病毒的数字pcr检测试剂盒及检测方法 - Google Patents
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Abstract
一种A型通用流感病毒的数字PCR检测试剂盒,包括逆转录酶、数字PCR缓冲液PCR MasterMix、A型流感病毒基因标准品,数字PCR检测试剂盒还包括上游引物、下游引物和特异性探针,上游引物A-FP:5’-GACCRATCCTGTCACCTCTGAC-3’;下游引物A-RP:5’-AGGGCATTYTGGACAAAKCGTCTA-3’;特异性探针A-P:5’-FAM-TGCAGTCCTCGCTCACTGGGCACG-BHQ1-3’,其中FAM为荧光报告基团,BHQ1为荧光淬灭基团;并采用数字PCR检测方法,方法简单,时间快结果准确。
Description
技术领域
本发明涉及一种A型通用流感病毒的数字PCR检测试剂盒机检测方法,可应用于A型通用流感病毒引起的实验室应急检测。
背景技术
目前,原有的定量PCR对原有的样本核酸只能进行相对定量,需要依靠标准曲线或参照基因来测定核酸量,是对起始样品的绝对定量。依靠Ct值常不能很好分辨:拷贝数变异、突变检测、基因相对表达研究(如等位基因不平衡表达)、二代测序结果验证、miRNA表达分析、单细胞基因表达分析等。而目前的荧光检测方法周期长,且对病毒是否为阳性的检测存在不确定结果,导致多次检测,或检测结果不准确。
发明内容
本发明要解决上述现有技术存在的问题,提供一种能够直接数出DNA分子的个数的方法,大大提高了检测灵敏度、精确性,适合重大传染病的早期筛查。
本发明解决其技术问题采用的技术方案:这种A型通用流感病毒的数字PCR检测试剂盒,包括逆转录酶、数字PCR缓冲液PCRMasterMix、A型流感病毒基因标准品,数字PCR检测试剂盒还包括上游引物、下游引物和特异性探针,上游引物、下游引物和特异性探针序列如下:
上游引物A-FP:5’-GACCRATCCTGTCACCTCTGAC-3’;
下游引物A-RP:5’-AGGGCATTYTGGACAAAKCGTCTA-3’;
特异性探针A-P:5’-FAM-TGCAGTCCTCGCTCACTGGGCACG-BHQ1-3’;
其中FAM为荧光报告基团,BHQ1为荧光淬灭基团;
其中A型流感病毒基因标准品序列如下:
GACCAATCCTGTCACCTCTGACTAGGGGGATTTTGGGATTTGTATTCACGCTCACCGTGCCCAGTGAGCGAGGACTGCAGCGTAGACGCTTTGTCCAAAATGCCCT。
其中数字PCR检测试剂盒中组分含有:
这种A型通用流感病毒的数字PCR检测方法,按照以下步骤进行:
(1)打开两份病毒核酸样品放入试管中,分别放入水浴42℃,金属浴65℃中,提取病毒核酸待检样本RNA;
(2)在试管中加入10ul的逆转录酶,10ul的逆转录酶由5ul的RNA模版、3ul的dH2O、1ul的Oligo或Random6引物、1ul的dNTP组成,将待检样本RNA逆转录为cDNA;
(3)在65℃环境中放置5min,然后在冰上快速冷却;该步通过RNA模板变性增强反转录效果
(4)加入4.5ul的dH2O、4ul的5*buffer、1ul的RTase和0.5ul的TNase抑制剂;
(5)轻轻混合均匀,在42℃的环境中放置30~60min;
(6)在95℃5min灭活酶,冰中保存;
(7)体系加入样本模板cDNA,每个20ul反应体系中含10ul数字PCR缓冲液PCRMasterMix,250nM探针,900nM引物,反应温度为:先95℃10min,再94℃30s→58℃60s,这样不停地循环变换温度40次;然后放在98℃的温度下10min,4℃保存或分析。温度变换的作用是荧光信号嵌入到病毒核酸中,使紫外读取仪能识别病毒,如果是阴性样品,随着仪器温度的升降,探针中荧光信号并不能嵌入,所以仪器判读结果为无信号。
(8)通过仪器读取20000个微孔中的荧光值。
这种数字PCR原理是微滴化处理,将每个样品分形成20,000个液滴,主要采用当前分析化学热门研究领域的微流控或微滴化方法,将大量稀释后的核酸溶液分散至芯片的微反应器孔中,每个反应器的核酸模板数少于或者等于1个。这样经过PCR循环之后,有一个核酸分子模板的反应器就会给出荧光信号,没有模板的反应器就没有荧光信号。根据相对比例和反应器的体积,就可以推算出原始溶液的核酸浓度。
为了进一步完善PCR仪器对于检测病毒量少的样本,ct值介于30~40之间的阳性不确定情况,本实验大大提高微量检测能力,进一步完善检测下限,给出更可靠的数据,进一步完善检测精确度,使样本核酸载量不再依靠标准品来推算,避免得出结果值波动幅度,明确定量样品中的核酸数量。
本发明有益的效果是:本发明提供的检测试剂和方法不但对于A型通用流感病毒灵敏度高,而且检测快速(通常只需4-5小时),能够及时满足疾病防控需求,提高检测灵敏度、可重复性。实验结果变异系数CV值小于10%,实验做了40份标本,均取得明显的效果。可以弥补荧光定量PCR检测限不足,筛查并快速判定可疑样本。
具体实施方式
下面结合实施例对本发明作进一步说明:
这种A型通用流感病毒的数字PCR检测试剂盒,包括逆转录酶、数字PCR缓冲液PCRMasterMix、A型流感病毒基因标准品,数字PCR检测试剂盒还包括上游引物、下游引物和特异性探针,上游引物、下游引物和特异性探针序列如下:
上游引物A-FP:5’-GACCRATCCTGTCACCTCTGAC-3’;
下游引物A-RP:5’-AGGGCATTYTGGACAAAKCGTCTA-3’;
特异性探针A-P:5’-FAM-TGCAGTCCTCGCTCACTGGGCACG-BHQ1-3’,
其中FAM为荧光报告基团,BHQ1为荧光淬灭基团;
其中A型流感病毒基因标准品序列如下:
GACCAATCCTGTCACCTCTGACTAGGGGGATTTTGGGATTTGTATTCACGCTCACCGTGCCCAGTGAGCGAGGACTGCAGCGTAGACGCTTTGTCCAAAATGCCCT。
其中数字PCR检测试剂盒中组分含有:
这种A型通用流感病毒的数字PCR检测方法,按照以下步骤进行:
(1)打开两份病毒核酸样品放入试管中,分别放入水浴42℃,金属浴65℃中,提取待检样本RNA;
(2)在试管中加入10ul的逆转录酶,10ul的逆转录酶由5ul的RNA模版、3ul的dH2O、1ul的Oligo或Random6引物、1ul的dNTP组成,将待检样本RNA逆转录为cDNA;
(3)在65℃环境中放置5min,然后在冰上快速冷却;
(4)加入4.5ul的dH2O、4ul的5*buffer、1ul的RTase和0.5ul的TNase抑制剂;
(5)轻轻混合均匀,在42℃的环境中放置30~60min;
(6)在95℃5min灭活酶,冰中保存。
(7)体系加入样本模板cDNA,每个20ul反应体系中含10ul数字PCR缓冲液PCRMasterMix,250nM探针,900nM引物,反应温度为:先95℃10min,再94℃30s→58℃60s,这样不停地循环变换温度40次;然后放在98℃的温度下10min,4℃保存或分析。
(8)通过仪器读取20000个微孔中的荧光值。仪器购自上海thermofisher公司,型号为QuantStudio3D。
标本数40份,结果对于病毒载量大于200c/ul的样品,数字PCR方法与荧光定量PCR方法结果一致性为98%,对于病毒载量小于200c/ul的样品,荧光定量PCR方法ct值介于32~40之间,判定样品可疑。数字PCR方法可以精确计算出样本中的病毒载量。
参照附表:本实施例中,咽拭子40个
通过数字PCR方法检测出来的数据,可以精确计算出样本中的病毒载量,从而可以明确确定病毒是否为阳性,不存在不确定结果。
虽然本发明已通过参考优选的实施例进行了描述,但是,本专业普通技术人员应当了解,在权利要求书的范围内,可作形式和细节上的各种各样变化。
Claims (3)
1.一种A型通用流感病毒的数字PCR检测试剂盒,包括逆转录酶、数字PCR缓冲液PCRMasterMix、A型流感病毒基因标准品,其特征是:所述数字PCR检测试剂盒还包括上游引物、下游引物和特异性探针,所述上游引物、下游引物和特异性探针序列如下:
上游引物A-FP:5’-GACCRATCCTGTCACCTCTGAC-3’;
下游引物A-RP:5’-AGGGCATTYTGGACAAAKCGTCTA-3’;
特异性探针A-P:5’-FAM-TGCAGTCCTCGCTCACTGGGCACG-BHQ1-3’,
其中FAM为荧光报告基团,BHQ1为荧光淬灭基团;
所述A型流感病毒基因标准品序列如下:
GACCAATCCTGTCACCTCTGACTAGGGGGATTTTGGGATTTGTATTCACGCTCACCGTGCCCAGTGAGCGAGGACTGCAGCGTAGACGCTTTGTCCAAAATGCCCT。
2.根据权利要求1所述的A型通用流感病毒的数字PCR检测试剂盒,其特征是:所述数字PCR检测试剂盒中组分含有:
3.一种A型通用流感病毒的数字PCR检测方法,按照以下步骤进行:
(1)打开两份病毒核酸样品放入试管中,分别放在水浴42℃、金属浴65℃中,提取病毒核酸待检样本RNA;
(2)在试管中加入10ul的逆转录酶,10ul的逆转录酶由5ul的RNA模版、3ul的dH2O、1ul的Oligo或Random6引物、1ul的dNTP组成,将待检样本RNA逆转录为cDNA;
(3)在65℃环境中放置5min,然后在冰上快速冷却;
(4)加入4.5ul的dH2O、4ul的5*buffer、1ul的RTase和0.5ul的TNase抑制剂;
(5)轻轻混合均匀,在42℃的环境中放置30~60min;
(6)在95℃5min灭活酶,冰中保存;
(7)体系加入样本模板cDNA,每个20ul反应体系中含10ul数字PCR缓冲液PCRMasterMix,250nM探针,900nM引物,反应温度为:先95℃10min,再94℃30s→58℃60s,这样不停地循环变换温度40次;然后放在98℃的温度下10min,4℃保存或分析;
(8)通过仪器读取20000个微孔中的荧光值。
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US20140005066A1 (en) * | 2012-06-29 | 2014-01-02 | Advanced Liquid Logic Inc. | Multiplexed PCR and Fluorescence Detection on a Droplet Actuator |
CN103571865A (zh) * | 2013-11-05 | 2014-02-12 | 中华人民共和国北京出入境检验检疫局 | 内含a型流感病毒m基因装甲rna标准物质 |
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KR20110028188A (ko) * | 2009-09-11 | 2011-03-17 | 주식회사 엘지생명과학 | 실시간 다중 역전사 중합효소 연쇄반응에 의한 일반 인플루엔자 a와 신종 인플루엔자의 동시 검출방법 |
US20140005066A1 (en) * | 2012-06-29 | 2014-01-02 | Advanced Liquid Logic Inc. | Multiplexed PCR and Fluorescence Detection on a Droplet Actuator |
CN103571865A (zh) * | 2013-11-05 | 2014-02-12 | 中华人民共和国北京出入境检验检疫局 | 内含a型流感病毒m基因装甲rna标准物质 |
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CN113186353A (zh) * | 2021-05-28 | 2021-07-30 | 杭州晶佰生物技术有限公司 | 针对c型逆转录病毒的数字pcr检测用引物及检测方法 |
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