CN103981254B - 一种脆性x综合症临床快速pcr检测试剂盒 - Google Patents
一种脆性x综合症临床快速pcr检测试剂盒 Download PDFInfo
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Abstract
本发明提供了一种脆性X综合症临床快速检测试剂盒,所述的试剂盒包括DNA聚合酶、dNTPs、引物群和缓冲体系。本发明的试剂盒用于检测脆性X综合症致病基因FMR-1(CGG)n片段拷贝数,从而推断出拷贝数的含量范围,可以快捷的查出致病基因的携带者以及病人,可以用于产前诊断、阻止患儿出生从而降低脆性X综合症的发病率。
Description
技术领域
本发明涉及一种脆性X综合症临床快速PCR检测试剂盒,属于生物工程技术领域。
背景技术
脆性X综合症是一种发病率仅次于唐氏综合症的遗传性智力低下综合症,呈X连锁遗传,占X连锁智力低下的40%。其外显率因男女性别不同有明显差异,男性80%,女性30%。脆性X综合症的发病率也因男女性别不同有差异,男性为1/4000,女性为1/6000.
95%以上的脆性X综合症患者发病的分子遗传学基础是FMR1基因上的CGG重复区结构扩展的突变引起的,5%以下则是由于FMR1基因的错义突变和缺失型突变影响FMR1基因的正常结构所导致的。
FMR1基因位于染色体Xq27.3,含17个外显子,全长38kb。在基因5’非翻译区存在一段数目可变的(CGG)n,在其上游250bp处存在一个CpG岛。(CGG)n片段序列重复引起CpG岛的甲基化,使FMR1基因的转录受到抑制。正常人群FMR-1基因(CGG)n重复次数在1-50之间。当重复数扩展到50-200时,携带者表型正常或有部分表现,但在遗传过程中会进一步扩展,通常被称为FMR-1基因的前突变。当重复数扩展达200及以上时,个体表现患病特征,这种FMR-1基因的突变称全突变。前突变CpG岛无异常甲基化,全突变常伴随有CpG岛异常甲基化,使FMR-1基因表达翻译产物受到抑制,从而造成临床症状。
脆性X综合症发病率高,临床表现复杂,目前尚无有效地诊断方法。降低脆性X综合症发病率关键是查出携带者以及患者。通过遗传咨询,产前诊断阻止患儿的出生。女性前突变携带者表型不明显,易被忽视,导致发病率逐代递增。因此开发一种进行X染色体FMR-1基因(CGG)n片段的检测的方法是非常有必要的。本发明旨在开发一种适用于临床检测的脆性X染色体综合症快速检测试剂盒。
目前已公开的检测方法如利用甲基化PCR、MLPA、SouthernBlot、RealTimePCR等方法虽然都对脆性X综合征进行检测,但因其耗时长,消费高,步骤繁琐等缺点限制了其应用范围,而本发明很好的弥补了这些缺点,并在已有技术的基础上进行了创新,使脆性X综合症的检测方法更为完善。
发明内容
本发明的目的是克服现有技术的不足之处,提供一种脆性X综合症临床快速PCR检测试剂盒。
本发明的用于检测脆性X综合症的PCR检测试剂盒,所述的PCR试剂盒包括DNA聚合酶、dNTPs、引物群和缓冲体系,
所述的引物群包括用于扩增FMR-1基因CGG重复区的上游引物F和下游引物R,以及用于扩增内参片段的上游引物F和下游引物M,所述的引物群的序列为下列(1)-(6)组中的任意一组,引物序列信息见表1:
表1:引物序列信息
SEQ ID NO:1 | CGACCTGTCACCGCCCTTCA |
SEQ ID NO:2 | GCACTTCCACCACCAGCTCCTC |
SEQ ID NO:3 | GCGGGTGTAAACACTGAAACCA |
SEQ ID NO:4 | TCACCGCCCTTCAGCCTTCC |
SEQ ID NO:5 | GCACTTCCACCACCAGCTCCTC |
SEQ ID NO:6 | GATCAACGCTGTTCCCTCCC |
SEQ ID NO:7 | CGACCTGTCACCGCCCTTCA |
SEQ ID NO:8 | TCCACCACCAGCTCCTCCATC |
SEQ ID NO:9 | GGGTGTAAACACTGAAACCACG |
SEQ ID NO:10 | TCACCGCCCTTCAGCCTTCC |
SEQ ID NO:11 | TCCACCACCAGCTCCTCCATC |
SEQ ID NO:12 | CGTGATCAACGCTGTTCCCTC |
SEQ ID NO:13 | TTCAGCCTTCCCGCCCTCCA |
SEQ ID NO:14 | GCACTTCCACCACCAGCTCCTC |
SEQ ID NO:15 | GATCAACGCTGTTCCCTCCC |
SEQ ID NO:16 | CGACCTGTCACCGCCCTTCAG |
SEQ ID NO:17 | AGCCCCGCACTTCCACCACC |
SEQ ID NO:18 | CGCTGCGGGTGTAAACACTGAA |
(1)目的基因引物的上游引物F的核苷酸序列为SEQIDNO:1,下游引物R的核苷酸序列为SEQIDNO:2,内参引物的上游引物F的核苷酸序列为SEQIDNO:1,下游引物M的核苷酸序列为SEQIDNO:3;
(2)目的基因引物的上游引物F的核苷酸序列为SEQIDNO:4,下游引物R的核苷酸序列为SEQIDNO:5,内参引物的上游引物F的核苷酸序列为SEQIDNO:4,下游引物M的核苷酸序列为SEQIDNO:6;
(3)目的基因引物的上游引物F的核苷酸序列为SEQIDNO:7,下游引物R的核苷酸序列为SEQIDNO:8,内参引物的上游引物F的核苷酸序列为SEQIDNO:7,下游引物M的核苷酸序列为SEQIDNO:9;
(4)目的基因引物的上游引物F的核苷酸序列为SEQIDNO:10,下游引物R的核苷酸序列为SEQIDNO:11,内参引物的上游引物F的核苷酸序列为SEQIDNO:10,下游引物M的核苷酸序列为SEQIDNO:12;
(5)目的基因引物的上游引物F的核苷酸序列为SEQIDNO:13,下游引物R的核苷酸序列为SEQIDNO:14,内参引物的上游引物F的核苷酸序列为SEQIDNO:13,下游引物M的核苷酸序列为SEQIDNO:15;
(6)目的基因引物的上游引物F的核苷酸序列为SEQIDNO:16,下游引物R的核苷酸序列为SEQIDNO:17,内参引物的上游引物F的核苷酸序列为SEQIDNO:16,下游引物M的核苷酸序列为SEQIDNO:18;
所述的PCR增强剂选自7-deaza-dGTP、甜菜碱或甜菜碱类似物、DMSO、甘油、甲酰胺和聚乙二醇中的2种或2种以上的组合;
所述的7-deaza-dGTP的工作浓度为0.05-0.2mmol/L,所述的甜菜碱或甜菜碱类似物的工作浓度为0.05-0.5mol/L,所述的DMSO的工作浓度为1-10%(v/v),所述的甘油的工作浓度为1-20%(v/v),所述的甲酰胺的工作浓度为1-10%(v/v),所述的聚乙二醇的工作浓度为1-20%(v/v)。
本发明中各个成分的“工作浓度”是指其在PCR体系中的浓度。
本发明还提供一种特异性区分脆X综合征检测用Marker,其组成为4个不同大小的DNA片段:1)170-230bp;2)420-480bp;3)600-640bp;4)1020-1080bp,浓度为50ng-100ng/ul.
本发明的试剂盒的检测结果更为直接,其特征在于扩增过程产生2条特征条带,其中一条为内参片段大小为:100-300bp;一条为目标片段,其大小为400-1200bp。当目标片段大小处于为400-650bp时,样品为阴性样本;当目标片段大小处于650bp-1100bp之间为阳性样本(前突变);当目标片段大于1100bp或无法扩增时,样本为阳性(全突变)。
本发明的试剂盒工作原理如下:该试剂盒以聚合酶链式反应技术扩增FMR-1基因CpG岛至第一个外显子区域,同时扩增反应中加入一条内参引物扩增内参片段以验证PCR扩增的正确性。PCR反应过程中产生2条特征条带,其中一条为内参片段大小为:100-300bp;一条为目标片段,其大小为400-1200bp。当目标片段为400-650bp时,样品为阴性样本;当目标片段位于650bp-1100bp之间时为阳性样本(前突变);当目标片段大于1100bp,或无法扩增时为阳性样本(全突变)。同时针对特定的引物群设计相匹配的的标准Marker,结合凝胶电泳技术快速高效地分析样本中(CGG)n重复序列的拷贝数。
本发明的试剂盒用于检测脆性X综合症致病基因FMR1(CGG)n片段拷贝数,从而推断出拷贝数的含量范围,可以快捷的查出致病基因的携带者以及病人,可以用于产前诊断、阻止患儿出生从而降低脆性X综合症的发病率。
附图说明
图1.实施例1中阴性样本检测电泳图;其中M为标准Marker,其分子量为2000bp,1000bp,750bp,500bp,250bp,100bp;M1为自制特异Marker,其分子量为1070bp,635bp,470bp,220bp;1为阴性样本PCR扩增结果。
图2.实施例2中阳性样本检测电泳图。其中M为标准Marker,其分子量为2000bp,1000bp,750bp,500bp,250bp,100bp;M1为自制特异Marker,其分子量为1070bp,635bp,470bp,220bp;2为阳性样本PCR扩增结果。
具体实施方式
实施例1制备检测脆性X综合症的PCR检测试剂盒
1、引物设计
在FRM-1基因的-600-+733区域设计一套特异的引物群,其包含用于扩增目标片段(含CGG重复区)的引物F、R;以及用于扩增内参片段的引物F、M。
引物群中F、R和M的序列选自表1中1-6组中的任意一组,引物序列见附表1。
2、准备PCR反应液
PCR反应液组分如下:1)10×缓冲液,缓冲液包括浓度为500mMTris-HCl(pH9.0)和20mMMgCl2。2)浓度为2.5mmol/L的dNTPs;3)浓度为10μmol/L的目的基因引物的上游引物F;4)浓度为10μmol/L的目的基因引物的下游引物R;5)浓度为10μmol/L的内参引物的上游引物F;6)浓度为10μmol/L的内参引物的下游引物M;7)活性为2.5U/μl的DNA聚合酶;8)PCR增强剂。9)双蒸水。
实施例2应用试剂盒进行阴性样本检测
1)DNA提取:在本人同意或其监护人知情条件下,采集其外周血。采用市售全式金血液DNA提取试剂盒提取,并标定其浓度为100ng/μl。样本临床表现为阴性。
2)使用实施例1的试剂盒准备PCR扩增体系;
PCR扩增体系:
其中,
引物群的序列如表1中第1组所示,
PCR增强剂组成:2.5mol/L甜菜碱6μl,DMSO4μl。
(3)PCR扩增条件:95℃预变性8min,暂停添加Taq酶1ul;95℃变性45s,60℃退火45s,72℃延伸1.5min,30个循环后终延伸10min。
(4)反应结束后,采用1.5%的琼脂糖凝胶电泳,DN2000Marker、特异Marker以及PCR产物同时进行电泳。电泳结束后,采用凝胶成像系统进行拍照检测。结果如图1。从结果可以看出,内参片段出现且大小相符,目标片段位于470bp和635bp之间,为阴性样本。此结果与临床检测结果相同。
实施例3应用试剂盒进行阳性样本检测
(1)DNA提取:在患者本人同意或其监护人知情条件下,采集其外周血。采用市售全式金血液DNA提取试剂盒提取,并标定其浓度为100ng/μl。该样本临床检测为脆性X综合症阳性。
(2)使用实施例1的试剂盒准备PCR扩增体系;
PCR扩增体系:
其中,引物群的序列如表1中第1组所示,
PCR增强剂组成:2.5mol/L甜菜碱6μl,DMSO4μl。
(3)PCR扩增条件:95℃预变性8min,暂停添加Taq酶1μl;95℃变性45s,60℃退火45s,72℃延伸1.5min,30个循环后终延伸10min。
(4)反应结束后,采用1.5%的琼脂糖凝胶电泳,DN2000Marker、特异Marker以及PCR产物同时进行电泳。电泳结束后,采用凝胶成像系统进行拍照检测。检测结果如图2所示。从结果可以看出,内参片段出现且大小相符,目标片段位于635bp和1070bp之间,为阳性样本(前突变)。此结果与临床检测结果相同。
结论:本发明的试剂盒可以快速地检测脆性X综合征。
序列表
<110>OrganizationName:江苏佰龄全基因生物医学技术有限公司
<120>Title:一种脆性X综合症临床快速PCR检测试剂盒
Sequence
--------
<213>OrganismName:人工序列
<400>PreSequenceString:
cgacctgtcaccgcccttca20
<212>Type:DNA
<211>Length:20
SequenceName:1
SequenceDescription:
Sequence
--------
<213>OrganismName:人工序列
<400>PreSequenceString:
gcacttccaccaccagctcctc22
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Claims (4)
1.用于检测脆性X综合症的PCR试剂盒,其特征在于,所述的PCR试剂盒包括DNA聚合酶、dNTPs、引物群、缓冲体系及检测用标准Marker;
所述的引物群包括用于扩增FMR-1基因CGG重复区的上游引物F和下游引物R,以及用于扩增内参片段的上游引物F和下游引物M,所述的引物群的序列如下,引物序列信息见表1:
目的基因引物的上游引物F的核苷酸序列为SEQIDNO:1,下游引物R的核苷酸序列为SEQIDNO:2,内参引物的上游引物F的核苷酸序列为SEQIDNO:1,下游引物M的核苷酸序列为SEQIDNO:3;
所述的试剂盒中还含有PCR增强剂,所述的PCR增强剂包含7-deaza-dGTP、甜菜碱或甜菜碱类似物、DMSO、甘油、甲酰胺和聚乙二醇中的2种或2种以上的组合。
2.根据权利要求1所述的试剂盒,其特征在于,还提供一种特异性区分脆X综合征检测用Marker,其组成为4个不同大小的DNA片段:1)170-230bp;2)420-480bp;3)600-640bp;4)1020-1080bp,浓度为50ng-100ng/μl。
3.根据权利要求1所述的试剂盒,其特征在于,扩增过程产生2条特征条带,其中一条为内参片段大小为:100-300bp;一条为目标片段,其大小为400-1200bp。
4.根据权利要求1所述的试剂盒,其特征在于,当目标片段大小处于为400-650bp时,样品为阴性样本;当目标片段大小处于650bp-1100bp之间为前突变;当目标片段大于1100bp或无法扩增时,样本为全突变。
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CN108531576A (zh) * | 2018-04-12 | 2018-09-14 | 北京信诺佰世医学检验所有限公司 | 检测脆性x染色体综合征的试剂盒和系统 |
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