CN114058509A - 用于pcr扩增的微量丝状真菌高纯度dna简易制备方法 - Google Patents
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Abstract
本发明公开了一种用于PCR扩增的微量丝状真菌高纯度DNA简易制备方法,包括以下几个步骤:步骤一,在微型离心管中,加入0.3~0.5 mm无菌石英砂至管总体积的1/20,挑取1~3 mm2真菌菌体菌丝样本于离心管中,加入几丁质酶溶液,捣碎,37℃孵育30分钟;步骤二,加入细胞裂解液,95℃振荡10分钟,离心收集含有核酸的上清液;步骤三,加入磁珠,对核酸‑磁珠复合物进行纯化和洗脱,获得高纯度的DNA。本发明克服了提取试剂盒对样本量的要求,解决了丝状真菌破壁困难,DNA提取中PCR抑制因子存在导致的PCR假阴性等技术问题,实现了微量丝状真菌DNA的快速高质量低成本制备。
Description
技术领域
本发明涉及核酸提取工艺的领域,尤其涉及一种用于PCR扩增的微量丝状真菌高纯度DNA简易制备方法的技术领域。
背景技术
在真菌分子生物学鉴定中,DNA模板在PCR扩增反应中起着至关重要的作用,高纯度的DNA可以减弱或消除导致PCR假阴性的PCR抑制因子。真菌的DNA提取过程中,一定程度有效地破坏真菌细胞壁是获取核酸的关键,而丝状真菌相比酵母菌,其细胞壁成分更为复杂,主要由几丁质、葡聚糖、甘露聚糖和糖蛋白等组成,更难被破坏。现有的真菌高纯度的核酸提取常采用试剂盒提取法,市场上常见的包括QIAGEN 12888 土壤DNA提取试剂盒、Biospin 真菌基因组DNA提取试剂盒、天根植物提取试剂盒等。针对菌落小或微量的丝状真菌样本,采用试剂盒提取法很难获得PCR扩增反应所需的核酸量,而且操作中还需使用球磨仪、高速离心机等仪器,提取成本也相对较高。
发明内容
为了克服现有技术的不足, 本发明的目的是提供一种用于PCR扩增的微量丝状真菌高纯度DNA简易制备方法,不采用试剂盒提取法,实现微量丝状真菌DNA的快速高质量低成本制备。
一种用于PCR扩增的微量丝状真菌高纯度DNA简易制备方法,包括以下步骤:
步骤一,在200 μL离心管中,加入尺寸为0.3~0.5 mm的石英砂至管总体积的1/20,用无菌牙签挑取1 mm2真菌菌体菌丝样本于离心管中,加入25 μL几丁质酶溶液,盖上管盖,振荡混匀,500 rpm 瞬时离心后,37℃孵育30分钟;
步骤二,加入25 μL细胞裂解液,95℃振荡10分钟,离心收集含有核酸的上清液;
步骤三,加入Beckman的XP纳米磁珠,形成核酸-磁珠复合物,在磁力架上移除上清液,加入洗涤液对核酸-磁珠复合物进行洗涤;移除磁力架,加入洗脱液对核酸-磁珠复合物进行洗脱,获得高纯度的DNA。
所述石英砂尺寸为0.3~0.5 mm,经121℃高温及灭菌处理30分钟。
所述几丁质酶来源于链球菌属真菌,其溶液浓度为1 mg/mL;
所述细胞裂解液,含Triton X-100 5.0%~10.0%,Tween 20 1.0%~5.0%,40 mM~100 mM Tris-HCl,pH 6.0。
所述洗涤液为75%~85%乙醇。
所述洗脱液为TE缓冲液,含10 mM Tris-HCl,1 mM EDTA, pH=8.0。
本发明的有益效果:本发明采用细胞壁酶解、蛋白等变性、磁珠纯化等步骤,专一性地解决丝状真菌破壁困难,去除丝状真菌样本中的杂质及PCR抑制因子等技术问题。该制备方法具有操作简单,试剂简单易得,样本量要求低,制备成本低的优点。
附图说明
图1是微量丝状真菌提取过程中不同阶段核酸作为模板的PCR产物琼脂糖凝胶电泳图;
其中,1、100 bp Marker;2、 EG1-1裂解后的上清液;3、 EG1-2裂解后的上清液;4、EG2-1裂解后的上清液;5、 EG2-2裂解后的上清液;6、 CGN1-1裂解后的上清液;7、 CGN1-2裂解后的上清液;8、 CGN2-1裂解后的上清液;9、 CGN2-2裂解后的上清液。
图2是本发明添加几丁质酶溶液与QIAGEN 12888 土壤DNA提取试剂盒获得的核酸作为模板的PCR产物琼脂糖凝胶电泳对比图;
图中,1、100 bp Marker;2、 EG1-1;3、 EG1-2;4、 EG2-1;5、 EG2-2;6、 CGN1-1;7、CGN1-2;8、 CGN2-1;9、 CGN2-2;10、 CG1-1;11、 CG1-2;12、 CG2-1;13、 CG2-2。
具体实施方式
以下结合附图和实施例对本发明作进一步阐述。
实施例1
一种用于PCR扩增的微量丝状真菌高纯度DNA简易制备方法,包括以下几个步骤:
步骤一,在200 μL离心管中,加入石英砂至管总体积的1/20,用无菌牙签挑取黑曲霉、橘青霉各1 mm2菌体菌丝于离心管中作为实验组,并标记为EG1、EG2,各加入25 μL几丁质酶溶液,盖上管盖,振荡混匀,500 rpm 瞬时离心后,37℃孵育30分钟;鉴于30分钟的孵育时间已达到丝状真菌破壁的目的,如因实验安排,采用37℃孵育更长时间或过夜处理,均可实施,但时间过长,核酸的不可控性会增大,可能会对后期实验造成不利影响,建议酶解时间30分钟。
步骤二,在上述溶液中加入25 μL细胞裂解液,95℃振荡10分钟,10000 g 离心5分钟,将上清液转移至新的200 μL离心管中;分别吸取2.0 μL含核酸的上清液进行PCR扩增反应,PCR反应体系为25 μL:2×Phanta Max Master Mix 12.5 μL,ITS1 (5’-TCCGTAGGTGAACCTGCGG-3’) (5 μM) 0.5 μL,ITS4 (5’-TCCTCCGCTTATTGATATGC-3’) (5 μM) 0.5 μL,DNA模板 2.0 μL,Nuclease-free H2O 9.5 μL;PCR反应参数:95℃,预变性2min;95℃ 30 s、55℃ 30 s、72℃ 30 s,30个循环;72℃ 5 min;8℃,保存。反应结束后取3μL PCR产物进行琼脂糖凝胶电泳,检测结果如图1所示。
步骤三,在上述剩余的上清液中加入50 μL纳米磁珠,轻弹混匀,500 rpm瞬时离心后,室温孵育5分钟,将离心管置于磁力架上,磁吸5分钟,形成核酸-磁珠复合物,移除清液;加入200 μL洗涤液对核酸-磁珠复合物进行洗涤,弃清液;室温条件下离心管开盖干燥5分钟,待磁珠干燥至磨砂状,加入30 μL洗脱液,移除磁力架,混匀后室温孵育5分钟,将离心管置于磁力架上磁吸5分钟,转移清液至新的200 μL微型离心管中即为获得的DNA。DNA在-20℃保存。
其中,石英砂尺寸为0.3~0.5 mm,且该石英砂经121℃高温及灭菌处理30分钟;几丁质酶来源于链球菌属真菌,其溶液浓度为1 mg/mL;细胞裂解液包括Triton X-100 5.0%~10.0%,Tween 20 1.0%~5.0%,40 mM~100 mM Tris-HCl,pH 6.0;纳米磁珠为Beckman的XP磁珠;洗涤液为75%~85%乙醇;洗脱液为TE缓冲液,包括10mM Tris-HCl,1mM EDTA,pH=8.0。
实施例2
本实施例的提取过程同实施例1,标记为CGN1、CGN2作为对照组1,区别在于步骤1中几丁质酶溶液用25 μL Nuclease-free H2O代替。
实施例3
用无菌牙签挑取黑曲霉、橘青霉各1 mm2菌体菌丝于2 mL离心管中作为对照组2,并标记为CG1、CG2,采用QIAGEN 12888 土壤DNA提取试剂盒,洗脱体积30 μL,完成CG1、CG2的DNA提取。
采用Nanodrop 2000对实验组和对照组1和2提取的DNA进行测定,检测结果如下表1:
根据测定浓度,取上述实验组和对照组中的DNA 11.5 μL进行PCR扩增反应。PCR反应体系为25 μL:2×Phanta Max Master Mix 12.5 μL,ITS1 (5’-TCCGTAGGTGAACCTGCGG-3’) (5 μM) 0.5 μL,ITS4 (5’-TCCTCCGCTTATTGATATGC-3’) (5 μM) 0.5 μL,DNA模板11.5 μL;PCR反应参数:95℃,预变性2 min;95℃ 30 s、55℃ 30 s、72℃ 30 s,30个循环;72℃ 5 min;8℃,保存。反应结束后取3 μL PCR产物进行琼脂糖凝胶电泳,检测结果如图2所示。
图1 表明,采用本发明方法提取核酸时,不论样本是否使用几丁质酶溶液处理,以未经磁珠纯化的含核酸上清液为模板,PCR产物均无条带。图2中2~9结果表明,采用本发明方法提取的核酸,其PCR产物均有条带,但提取过程中未加入几丁质酶溶液的样本均无条带,结合表1测定的结果,表明未添加几丁质酶溶液的样本,可能细胞壁难以得到破坏而无法得到所需核酸。对比图1和图2中2~9可知,尽管添加了几丁质酶专一性裂解丝状真菌样本,若后期未经磁珠纯化步骤处理,即使裂解后获得了一定量核酸,但因PCR抑制因子的存在导致后期PCR无条带,因此,几丁质酶溶液破壁处理和磁珠纯化步骤是制备微量丝状真菌获取PCR所需DNA必不可少的关键步骤,缺一不可。
由表1可知,采用试剂盒提取微量的丝状真菌DNA,其A260/A280与本发明提取的相当,介于1.6~1.7,但浓度很低或无。由图2中2~5和10~13可知,本发明提取的DNA PCR扩增有条带,而试剂盒提取的无条带。表1和图2表明,本发明核酸制备获得的DNA浓度佳,纯度优,可以满足后期的PCR扩增。本发明核酸制备方法具有操作简单、便捷,试剂简单易得,制备成本低的优点,为微量的丝状真菌分子生物学鉴定提供了可行性方案。
Claims (6)
1.一种用于PCR扩增的微量丝状真菌高纯度DNA简易制备方法,其特征在于:包括以下步骤:
步骤一,在200 μL离心管中,加入尺寸为0.3~0.5 mm的石英砂至管总体积的1/20,用无菌牙签挑取1 mm2真菌菌体菌丝样本于离心管中,加入25 μL几丁质酶溶液,盖上管盖,振荡混匀,500 rpm 瞬时离心后,37℃孵育30分钟;
步骤二,加入25 μL细胞裂解液,95℃振荡10分钟,离心收集含有核酸的上清液;
步骤三,加入Beckman的XP纳米磁珠,形成核酸-磁珠复合物,在磁力架上移除上清液,加入洗涤液对核酸-磁珠复合物进行洗涤;移除磁力架,加入洗脱液对核酸-磁珠复合物进行洗脱,获得高纯度的DNA。
2.如权利要求1所述的方法,其特征在于:所述石英砂尺寸为0.3~0.5 mm,经121℃高温及灭菌处理30分钟。
3.如权利要求1所述的方法,其特征在于:所述几丁质酶来源于链球菌属真菌,其溶液浓度为1 mg/mL。
4.如权利要求1所述的方法,其特征在于:所述细胞裂解液,含Triton X-100 5.0%~10.0%,Tween 20 1.0%~5.0%,40 mM~100 mM Tris-HCl,pH 6.0。
5.如权利要求1所述的方法,其特征在于:所述洗涤液为75%~85%乙醇。
6.如权利要求1所述的方法,其特征在于:所述洗脱液为TE缓冲液,含10 mM Tris-HCl,1 mM EDTA,pH=8.0。
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