CN112094898A - 一种鉴定mefv基因同时含两个突变位点位置的试剂盒及方法 - Google Patents
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Abstract
本发明公开了一种鉴定MEFV基因同时含两个突变位点位置的试剂盒及方法。所述试剂盒中含有如下引物对:F1:CAGGGCGACCTCCTCAATGGGCC;R1:GCAGAAGGAGTGCAGGCCCTTGG;F2:CAGGGCGACCTCCTCAATGGCGT;R2:GCAGAAGGAGTGCAGGCCCTACC;所述两个突变位点为C.1229G>A、C.688G>C突变位点。本发明能够鉴定C.1229G>A、C.688G>C突变位点是在同一条染色体,还是不同的染色体上,工作量小,耗时短,易操作。
Description
技术领域
本发明属于生物医学检测技术领域,具体涉及一种鉴定PAH基因同时含两个突变位点(C.1229G>A、C.688G>C)位置的试剂盒及方法。
背景技术
MEFV基因发生致病突变可导致家族性地中海热(FMF),为常染色体隐性遗传的疾病,临床以反复发作的短暂的炎性反应和浆膜炎为主要表现,亦可以淀粉样变为首发症状。MEFV基因突变导致其编码的蛋白Pyrin减少,Pyrin蛋白抑制NALP3-炎症复合体的作用减弱,从而使NALP3-炎症复合体过度活化,产生炎性反应。约70%的FMF患者体内存在MEFV基因突变,检测有无MEFV基因突变及突变的类型,可帮助明确诊断。
不同的MEFV基因的突变对MEFV活性及结构影响的程度不同。针对于本案中涉及到的两个突变位点,发生在同一条或者不同的染色体上,对患者病情严重程度的影响是不同的。如果两个突变发生在同一条染色体上,则不致病;两个突变分别发生在不同的染色体上,则致病。为了评估疾病的严重程度,鉴定已知的不同的MEFV基因突变分布在同一条还是不同染色体上,对疾病的诊断具有决定性作用。现有的方法是提取DNA,构建载体,进行体外表达实验,需要全套的分子生物学及微生物、细胞培养的实验室,难度极大,且工作量大,耗时长,普通实验室难以实施。
发明内容
本发明旨在克服现有技术的不足,提供一种鉴定MEFV基因同时含两个突变位点位置的试剂盒及方法。
为了达到上述目的,本发明提供的技术方案为:
鉴定MEFV基因同时含两个突变位点位置的试剂盒中含有如下引物对:
F1:CAGGGCGACCTCCTCAATGGGCC(SEQ ID NO.1)
R1:GCAGAAGGAGTGCAGGCCCTTGG(SEQ ID NO.2)
F2:CAGGGCGACCTCCTCAATGGCGT(SEQ ID NO.3)
R2:GCAGAAGGAGTGCAGGCCCTACC(SEQ ID NO.4);
所述两个突变位点为:C.1229G>A、C.688G>C突变位点。
优选地,引物对按如下排列组合使用:
①:F1+R1
②:F1+R2
③:F2+R1
④:F2+R2。
优选地,根据C.1229G>A、C.688G>C突变分布情况,引物对按如下排列组合使用:
①:当待测样本同时含C.1229G>A、C.688G>C突变但分布在不同染色体上时:F1+R2或F2+R1;其中,F1和R1是检测野生型的引物;
②当待测样本同时含C.1229G>A、C.688G>C突变且分布在同一条染色体上时:F2+R2。
基于上述试剂盒鉴定同时含C.1229G>A、C.688G>C突变位点的方法是采用所述试剂盒中的引物对,在如下次序和条件下进行扩增检测:
①:94℃,5min;
②:94℃,30s;60℃,30s;72℃,2min;35Cycles;
③:72℃,10min;25℃,∝;
若扩增后的片段经琼脂糖凝胶电泳出现特异性条带,则表明存在C.1229G>A、C.688G>C。
本发明根据MEFV基因已知位点C.1229G>A、C.688G>C突变,设计两组引物,第一组:3′端碱基与正常的模板碱基互补,第二组:3′端碱基与突变的模板碱基互补。基于耐热TaqDNA聚合酶缺乏3′→5′外切校正活性的特点,引物3′端的特异碱基分别互补于野生型和突变型等位基因的相对碱基,若此碱基对形成错配,链延伸反应就会因3′,5′-磷酸二酯键形成障碍而受阻,所以其扩增结果为:野生模板阻碍,突变引物放大;或突变模板阻碍,野生引物放大。
本发明设计了不同的引物对,将提取的模板扩增后进行琼脂糖凝胶电泳从而达到鉴定的目的。本发明能够鉴定C.1229G>A、C.688G>C突变位点是在同一条染色体,还是不同的染色体上。现有的方法是提取DNA、构建克隆载体、构建克隆载体、体外表达实验,需要全套的分子生物学及微生物、细胞培养的实验室,难度极大,且工作量大,耗时2-3个月,普通实验室难以实施,本发明仅需要引物设计、提取DNA、扩增与跑胶,能够在1天内完成所有试验,工作量小,耗时短,易操作成本极低,且普通分子实验室均可操作。
附图说明
图1为Z、T、S样本电泳图;
图2为对比引物对电泳图。
具体实施方式
1.DNA提取
选取3个样本,一个野生型,命名为Z,一个同时含C.1229G>A、C.688G>C突变但分布在不同染色体上的样本,命名为T,另一个同时含C.1229G>A、C.688G>C突变且分布在同一条染色体上的样本,命名为S。根据试剂QIAamp DNA Blood Mini Kit(250)(凯杰,163030523)说明书提取DNA,保存于-20℃备用。
2.PCR扩增
根据表1所示反应体系进行片段扩增(商用试剂购自南京诺唯赞生物科技有限公司)。
表1反应体系
| 试剂 | 体积(μL) |
| 2×Vazyme LAmp Master Mix(商用) | 25 |
| ddH2O | 13 |
| Primers Mixer(F+R) | 8 |
| 模板DNA(商用) | 4 |
| 总体积 | 50 |
按照表1配置反应体系,其中,Primers Mixer(F+R)为扩增引物。
本发明设计了两组扩增引物序列,如下表2。其中F1、F2序列3’端是针对位点C.1229G>A野生型和突变型模板,R1、R2序列3’端是针对位点C.688G>C野生型和突变型模板。表2引物序列按5P浓度1:1F端与R端自由组合,可得4组Primers Mixer(F+R)混合物,如表3。
表2引物序列
表3 Primers Mixer(F+R)引物组合
| 第1组 | F1+R1 |
| 第2组 | F1+R2 |
| 第3组 | F2+R1 |
| 第4组 | F2+R2 |
所有试剂配制完成后,将每组引物分装成3份,分别加入样本Z、T和S,得12份混合液,按照引物分组命名为Z1-Z4,T1-T4和S1-S4,并按照下列扩增程序进行PCR扩增:
[94℃,5min];[94℃,30s;60℃,30s;72℃,2min;35Cycles];[72℃,10min;25℃,∝]。
3.电泳
①配置凝胶
取1g琼脂糖凝胶(干粉)加入100ul 1X TAE溶液混合。将混合液放入微波炉,设置微波炉“大火-3min”。待冷却后加入5ul DD核酸染料,混匀倒胶待凝固。
②点样
用水稀释到1X loading buffer。取出待测扩增产物,按照产物:(loadingbuffer)=1:1比例在配置好的胶块上加样。同时在一泳槽内加入DL 2000DNA Marker。
③电泳
设置好电泳仪参数:70V-100min。
4.结果
结果如图1所示,Z样本在第一组引物组合中出现特异性条带,其余组合未出现条带。T样本在第2组、第3组出现了特异性条带,第1组,第4组未出现条带。S样本在第4组引物组合中出现特异性条带,第1、2、3组均未出现。
5.对照
对照组的引物序列如表4,引物组合如表5,其他操作同具体实施方式的1至3。
表4对照引物序列
表5 Primers Mixer(F+R)对照引物组合
| 第1组 | F1+R1 |
| 第2组 | F1+R2 |
| 第3组 | F2+R1 |
| 第4组 | F2+R2 |
结果如图2所示,Z样本除了在第一组引物组合中出现特异性条带,在不应该出现条带的其余组合也出现了条带;T样本除了在第2组、第3组出现了特异性条带,在不应该出现条带的第1组,第4组也出现了条带;S样本除了在第4组引物组合中出现特异性条带,在不应该出现条带的第1、2、3组也出现了条带。
序列表
<110> 长沙金域医学检验实验室有限公司
<120> 一种鉴定MEFV基因同时含两个突变位点位置的试剂盒及方法
<141> 2020-09-10
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Claims (4)
1.一种鉴定MEFV基因同时含两个突变位点位置的试剂盒,其特征在于,所述试剂盒中含有如下引物对:
F1:CAGGGCGACCTCCTCAATGGGCC
R1:GCAGAAGGAGTGCAGGCCCTTGG
F2:CAGGGCGACCTCCTCAATGGCGT
R2:GCAGAAGGAGTGCAGGCCCTACC;
所述两个突变位点为:C.1229G>A、C.688G>C突变位点。
2.如权利要求1所述的试剂盒,其特征在于,引物对按如下排列组合使用:
①:F1+R1
②:F1+R2
③:F2+R1
④:F2+R2。
3.如权利要求2所述的试剂盒,其特征在于,根据C.1229G>A、C.688G>C突变分布情况,引物对按如下排列组合使用:
①当待测样本同时含C.1229G>A、C.688G>C突变但分布在不同染色体上时:F1+R2或F2+R1;
②当待测样本同时含C.1229G>A、C.688G>C突变且分布在同一条染色体上时:F2+R2。
4.一种鉴定MEFV基因同时含两个突变位点位置的方法,其特征在于,所述方法是采用权利要求1至3任一项所述试剂盒中的引物对,在如下次序和条件下进行扩增检测:
①:94℃,5min;
②:94℃,30s;60℃,30s;72℃,2min;35Cycles;
③:72℃,10min;25℃,∝;
若扩增后的片段经琼脂糖凝胶电泳出现特异性条带,则表明存在C.1229G>A、C.688G>C突变位点。
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| US6627745B1 (en) * | 1997-08-21 | 2003-09-30 | The United States Of America As Represented By The Department Of Health And Human Services | Pyrin gene and mutants thereof, which cause familial Mediterranean fever |
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| CN110004219A (zh) * | 2019-04-19 | 2019-07-12 | 格尚微(上海)生物科技有限公司 | 一种egfr t790m和c797s顺式突变的检测方法 |
| CN110055312A (zh) * | 2019-04-09 | 2019-07-26 | 嘉兴雅康博医学检验所有限公司 | 用于检测egfr基因c797s和t790m顺反式突变的引物、探针及试剂盒 |
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