CN103820529A - 断肠草鉴别的引物及pcr方法 - Google Patents

断肠草鉴别的引物及pcr方法 Download PDF

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CN103820529A
CN103820529A CN201210464624.XA CN201210464624A CN103820529A CN 103820529 A CN103820529 A CN 103820529A CN 201210464624 A CN201210464624 A CN 201210464624A CN 103820529 A CN103820529 A CN 103820529A
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黄璐琦
袁媛
李旻辉
崔占虎
蒋超
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Institute of Materia Medica of CAMS
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Abstract

本发明属于分子生物学技术领域,涉及中药及中药材鉴定领域,特别涉及一种能够特异鉴定断肠草的PCR扩增方法及其特异引物。使用此方法鉴别断肠草与金银花,只通过简单的DNA提取、PCR特异性扩增、电泳检测即可完成对样品的鉴别。具有操作简单、特异性强、重复性好等优点。主要用于断肠草与金银花之间的快速鉴定。

Description

断肠草鉴别的引物及PCR方法
技术领域
本发明属于分子生物学技术领域,涉及中药及中药材鉴定领域,特别涉及一种能够特异鉴定断肠草的PCR扩增方法及其特异引物。
背景技术
断肠草为马前科植物钩吻Gelsemium elegans(Gardn.el Champ)Benth.的茎藤。又名胡蔓藤、野葛、水莽草、大茶叶、烂肠草,是一种剧毒草药。有祛风攻毒、消肿、止痛之功效。可治湿疹、痈肿、风湿痹痛等。
近年来由于误服断肠草而中毒的事故在各地不断发生,对其也进行了许多研究,证实断肠草的根、茎、叶子的主要成分为钩吻素子、钩吻素寅、钩吻素卯等。调查发现误将断肠草为金银花煮水当凉茶喝而中毒的事件时有发生,在断肠草中毒的78例临床事件中,发现43例为因误将断肠草为金银花煮水当凉茶喝而中毒,18例为将断肠草根为其他草药煮水喝而中毒(李文升.急性断肠草中毒78例临床分析,医学信息,2011,24(9):5872)。因此,建立一种用于鉴别钩吻和金银花的方法非常重要。
黄伟雄等采用色谱的方法通过分析钩吻碱成分对断肠草中进行鉴定(黄伟雄,李汴生,范山湖,等.应用TLC法鉴定断肠草中钩吻碱,华南预防医学,2008,34(1):60),但这种方法比较繁琐,不利于推广。近年来发展的以分子生物学为基础的检测方法如DNA barcoding和位点特异性PCR等克服了药材传统鉴别方法准确度不高、主观性大等缺点。对断肠草与金银花之间的分子鉴别还尚未见报道,本发明通过特异性PCR的方法实现了断肠草与金银花的快速、准确鉴别。在本发明被公布之前,尚未有任何公开或报道过本专利申请中所提及的PCR方法及引物。
发明内容
本发明的目的是提供一种断肠草的PCR引物及其鉴定方法,该PCR鉴定方法操作简单、样品量少,能快速、准确的将断肠草从其易混淆的金银花样品中鉴定出来,为断肠草鉴定提供了一种实用的技术。
1、一种鉴定断肠草的特异引物F1、F2,其序列为:
F1:5’-TCTCCGCCCTCTGCTCTA-3’,
F2:5’-GGAAGAAAGGAGTTTTTATGAGG-3,。
2、一种断肠草的PCR鉴定方法,其特征在于,包括下列步骤:
a)从所述材料中提取到DNA样品;
b)用权利要求1所述的引物进行PCR反应,扩增反应体系包括:10×buffer缓冲液2μL,dNTP1.6μL,引物各0.5μL,EX Tap酶0.2μL,DNA0.5μL,灭菌蒸馏水14.7μL。反应条件:解链温度95℃,时间5min,退火温度57℃,时间30s,复性温度72℃,时间为1min40s,35个循环后72℃延伸,时间为7min;
c)电泳所述扩增产物,如果存在分子量约为300bp的单一条带,则确定所检材料为断肠草。
附图说明
图1:断肠草、金银花、山银花及水银花PCR鉴别结果
1.断肠草(广西);2.断肠草(贵州);3.空白对照;4.金银花(河南);5.金银花(广西);6.金银花(江苏);7.金银花(北京);8.山银花(广西);9.山银花(云南);10.山银花(贵州);11.水银花(贵州);M.DNA分子量标准:从上至下依次为2000bp、1000bp、750bp、500bp、250bp、100bp
具体实施方式
1材料
所用材料如表1所示,包括:
表1样品来源表
2鉴别引物设计
选择通用引物psbA-trnH(trnH:5’-CGC GCA TGG TGG ATT CAC AAT CC-3,psbA:5’-GTT ATG CAT GAA CGT AAT GCT C-3’)对断肠草样品进行扩增,搜索Genbank中金银花的psbA-trnH序列(Genbank登录号:GU1353313.1;JN045253.1),然后进行同源比对,根据其变异区设计一对特异引物F1、F2,序列为下:
F1:5’-TCTCCGCCCTCTGCTCTA-3’,F2:5’-GGAAGAAAGGAGTTTTTATGAGG-3’。
3DNA提取
选取无霉变的干燥药材约0.03g,置于粉碎机中研磨粉碎,过40目筛。将粉末转移到2.0mL的微量离心管中,加入900μL已灭菌的CTAB提取液(2%CTAB,100mmol/L Tris-HCl pH=8.0,20mmol/L EDTA,1.4mol/L NaCl)、0.02g PVP40000、10μLβ-巯基乙醇充分振荡混匀,65℃水浴1.5h-2h,期间轻摇2-3次。结束后取出冷却至室温,加入900μL氯仿-异戊醇(24∶1),充分振荡混匀,12000×g离心10min。取上清,加入等体积氯仿-异戊醇(24∶1),充分振荡混匀,12000×g离心10min。取上清,加入2/3体积预冷的异丙醇溶液,-20℃放置0.5h以上。取出,12000×g离心10min,弃上清,沉淀用70%乙醇洗涤两次,37℃挥干乙醇,用适量灭菌水溶解,-20℃保存。
4PCR扩增
PCR反应在200μLPCR反应管中进行,反应总体积20μL,包括以下试剂:2.0μL10×buffer缓冲液,1.6μL dNTP(2.5mM),0.25μL鉴别引物F1(5μM),0.25μL鉴别引物F2(5μM),0.25μL通用引物1F(5μM),0.25μL通用引物724R(5μM),0.2μLTaq DNA聚合酶(Takara公司,Extaq 5UμL-1),0.5μL模板DNA,14.7μL无菌双蒸水。
PCR反应液配制完后,轻轻震荡混匀,将PCR管放入PCR仪中,进行如下反应:解链温度95℃,时间5min,退火温度57℃,时间30s,复性温度72℃,时间为1min40s,35个循环后72℃延伸7min,获得扩增产物。取3μL扩增产物,采用1%的琼脂糖凝胶,在电压100-150V下电泳15分钟,凝胶成像系统下观察并拍照。
断肠草与金银花的电泳结果如图1,结果可见,断肠草能够扩增出片段大小分别约为1000bp和300bp的两条带,而金银花则只扩增出片段大小约为300bp的单一条带,表明该体系能将断肠草与金银花准确的鉴别出来。

Claims (2)

1.一种鉴定断肠草的特异引物F1、F2,其序列为:F1:5’-TCTCCGCCCTCTGCTCTA-3’,F2:5’-GGAAGAAAGGAGTTTTTATGAGG-3’。
2.一种断肠草的PCR鉴定方法,其特征在于,包括下列步骤:
a)从所述材料中提取到DNA样品;
b)用权利要求1所述的引物进行PCR反应,扩增反应体系包括:10×buffer缓冲液2μL,dNTP1.6μL,引物各0.5μL,EX Tap酶0.2μL,DNA0.5μL,灭菌蒸馏水14.7μL;反应条件:解链温度95℃,时间5min,退火温度57℃,时间30s,复性温度72℃,时间为1min40s,35个循环后72℃延伸,时间为7min;
c)电泳所述扩增产物,如果存在分子量约为300bp的单一条带,则确定所检材料为断肠草。
CN201210464624.XA 2012-11-19 2012-11-19 断肠草鉴别的引物及pcr方法 Pending CN103820529A (zh)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104212882A (zh) * 2013-12-05 2014-12-17 李旻辉 紫花地丁鉴别的引物及pcr方法
CN104630326A (zh) * 2013-11-08 2015-05-20 中国中医科学院中药研究所 断肠草鉴别的引物及pcr方法
CN110499358A (zh) * 2019-09-06 2019-11-26 广州中医药大学(广州中医药研究院) 用于rpa-lfd鉴定钩吻的引物组、产品及鉴定方法与应用

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
LI ET AL.: "ACCESSION:JN045253.1 GI:343194636", 《GENBANK》 *
SUN ET AL.: "Identification of Lonicera japonica and its related species using the DNA barcoding method", 《PLANTA MED》 *
陈士林等: "中药鉴定学新技术新方法研究进展", 《中国中药杂志》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104630326A (zh) * 2013-11-08 2015-05-20 中国中医科学院中药研究所 断肠草鉴别的引物及pcr方法
CN104212882A (zh) * 2013-12-05 2014-12-17 李旻辉 紫花地丁鉴别的引物及pcr方法
CN110499358A (zh) * 2019-09-06 2019-11-26 广州中医药大学(广州中医药研究院) 用于rpa-lfd鉴定钩吻的引物组、产品及鉴定方法与应用

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Application publication date: 20140528