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CN107058372A - 一种应用于植物上的CRISPR/Cas9载体的构建方法 - Google Patents

一种应用于植物上的CRISPR/Cas9载体的构建方法 Download PDF

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CN107058372A
CN107058372A CN201710035068.7A CN201710035068A CN107058372A CN 107058372 A CN107058372 A CN 107058372A CN 201710035068 A CN201710035068 A CN 201710035068A CN 107058372 A CN107058372 A CN 107058372A
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汤浩茹
江雷雨
陈清
陈品文
冯琛
叶云天
李亚丽
张云婷
肖婕
王小蓉
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Sichuan Agricultural University
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Abstract

本发明涉及一种应用于植物上的CRISPR/Cas9载体的构建方法,其包括:S1:靶序列退火复性;S2:PSG载体的酶切;S3:连接和转化;S4:重组质粒的鉴定和提取;S5:重组资料和PCC质粒的双酶切;S6:连接、转化和鉴定。其获得的载体不仅能够作用于单个靶位点,而且能够同时作用于两个靶位点。

Description

一种应用于植物上的CRISPR/Cas9载体的构建方法
技术领域
本发明涉及植物分子生物学领域,尤其涉及应用于植物上的CRISPR/Cas9载体的构建方法。
背景技术
CRISPR/Cas9技术是自2013年兴起的一种高效简便的基因组编辑技术,目前已在动物、模式植物中得到广泛应用。它主要是基于细菌的一种获得性免疫系统改造而成,由于其可用于对DNA进行定点编辑,并且可以同时作用于多个靶位点,同时编辑多个基因,较常规转基因方法具有明显优势,且沉默效果更加彻底,因此越来越多的研究人员对其产生了浓厚兴趣。此外,在常用的基因组编辑技术中,CRISPR/Cas9相对于ZFN和TALEN技术,具有操作简便、制备成本低的巨大优势,使其在常规分子生物学实验室即可使用。
目前,应用于动物上的CRISPR/Cas9载体已经有大量的报道,而应用于植物上的CRISPR/Cas9载体则相对较少,特别是能够进行多位点编辑的载体。
发明内容
为克服现有技术存在的上述技术问题,本发明提供了能够应用于植物上的CRISPR/Cas9载体的构建方法,由其获得的载体不仅能够作用于单个靶位点,而且能够同时作用于两个靶位点。
本发明解决上述技术问题的技术方案如下:一种应用于植物上的CRISPR/Cas9载体的构建方法,其包括:
S1:靶序列退火复性:根据选定的靶序列,合成互补的Oligo DNA,将合成的OligoDNA序列进行退火复性获得DNA双链序列,并稀释;
S2:PSG载体的酶切:采用限制性内切酶BbsI酶切pSG载体,酶切产物经超薄产物纯化试剂盒进行回收;
S3:连接和转化:配置连接体系,将S1获得的稀释后的DNA双链序列与S2获得的酶切产物进行连接反应,将获得的全部连接产物采用热激发转化至大肠杆菌JM109中;
S4:重组质粒的鉴定和提取:分别挑单菌落于LB/Amp液体培养基中震荡培养,分别以M13fwd和Oligo-R为引物进行菌液PCR鉴定,将验证正确的菌液转接到新鲜的LB/Amp液体培养基中,培养后进行质粒的提取,得到重组质粒;
S5:重组资料和PCC质粒的双酶切:将得到的重组质粒和PCC质粒进行双酶切,酶切产物经1%的琼脂糖凝胶电泳后,采用凝胶回收试剂盒分别回收目标片段;
S6:连接、转化和鉴定:配置连接体系,将S5获得的酶切回收目标片段进行连接反应,将获得的全部连接产物采用热激发转化至大肠杆菌JM109中,挑单菌落于LB/Kan液体培养基中震荡培养,并进行菌液PCR鉴定,将阳性菌液转接到新鲜的LB/Kan液体培养基中培养,提取质粒,即获得构建好的CRISPR/Cas9载体。
在上述技术方案的基础上,本发明还可以做如下改进。
进一步,所述PSG载体的构建包括:
以pX330质粒为模板,使用高保真酶PrimeSTAR HS DNAPolymerase扩增sgRNA片段,回收该片段,标记为sgRNA1,引物序列为SEQ ID NO.1所示的Sg1-F和SEQ ID NO.2所示的Sg1-R;
使用EcoRI-HF和XbaI分别双酶切pUC19和sgRNA1,回收目的片段后按1:7的摩尔比进行连接,得到重组质粒pSG1,测序,保留序列完全正确的阳性质粒;
以pSG1质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增sgRNA片段,回收该片段,标记为sgRNA,引物序列为SEQ ID NO.3所示的Sg2-F和SEQ ID NO.4所示的Sg2-R;
使用EcoRI-HF和XbaI双酶切pUC19,使用BsaI酶切sgRNA,回收目的片段后按1:7的摩尔比进行连接,得到重组质粒pSG,测序,保留序列完全正确的阳性质粒。
进一步,所述PCC载体的构建包括:
以pX330质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增hSpCas9片段,其中引物Cas-F:Cas-R1:Cas-R2=1.5:0.2:1.3,回收该片段,标记为hSpCas9,Cas-F的序列如SEQ ID NO.5所示,Cas-R1的序列如SEQ ID NO.6所示,Cas-R2的序列如SEQ IDNO.7所示;
使用NcoI-HF和BstEII-HF分别双酶切pCAMBIA1302和hSpCas9,回收目的片段后按1:5的摩尔比进行连接,得到重组质粒pCC1,测序,保留序列完全正确的阳性质粒;
以pCAMBIA1302质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增CaMV 35enhanced promoter片段,回收该片段,标记为CaMV-ep,引物序列为SEQ ID NO.8所示的CaMV-ep-F和SEQ ID NO.9所示的CaMV-ep-R;
使用HindIII和NcoI分别双酶切pCC1和CaMV-ep,回收目的片段后按1:5的摩尔比进行连接,得到重组质粒pCC,测序,保留序列完全正确的阳性质粒。
进一步,在步骤S1中,合成一对互补的Oligo DNA,即序列为SEQ ID NO.10所示的Oligo-F和序列为SEQ ID NO.11所示的Oligo-R。
进一步,在步骤S1中,合成两对互补的Oligo DNA,分别为序列为SEQ ID NO.12所示的Oligo1-F,序列为SEQ ID NO.13所示的Oligo1-R,序列为SEQ ID NO.14所示的Oligo2-F及序列为SEQ ID NO.15所示的Oligo2-R。
进一步,在步骤S1中,将所述合成的Oligo DNA序列进行退火复性的反应程序为:95℃变性5min,每30s降温1℃,降温至25℃,并于4℃保存;在所述步骤S2中,PSG载体的酶切的反应体系为100μL,37℃反应过夜,65℃反应20min。
进一步,在所述步骤S4中,所得到的重组质粒为pSG-CZ;在所述步骤S5中,将得到的pSG-CZ重组质粒、pCC质粒分别采用EcoRI-HF和XbaI进行双酶切,37℃酶切3h后,65℃反应20min得到所述酶切产物。
进一步,在所述步骤S4中,所得到的重组质粒为pSG-CZ1和pSG-CZ2;所述步骤S5中,将得到的pSG-CZ1重组质粒采用EcoRI-HF和KpnI进行双酶切,pSG-CZ2重组质粒采用XbaI和KpnI进行双酶切;或将得到的pSG-CZ1重组质粒采用EcoRI-HF和BamHI进行双酶切,pSG-CZ2重组质粒采用XbaI和BamHI进行双酶切;并将pCC质粒采用EcoRI-HF和XbaI进行双酶切,37℃酶切3h后,65℃反应20min,得到所述酶切产物。
进一步,在所述步骤S6中,所述菌液PCR鉴定以M13rev和Oligo-R为引物。
进一步,在所述步骤S6中,所述菌液PCR鉴定以Oligo1-F和Oligo2-R为引物。
与现有技术相比,本发明提供的应用于植物上的CRISPR/Cas9载体的构建方法可获得应用于植物上的CRISPR/Cas9载体,可用于下一步的遗传转化试验,该载体不仅能够作用于单个靶位点,而且能够同时作用于两个靶位点。
附图说明
图1为PSG载体的图谱;
图2为PCC载体的图谱;
图3为本发明提供的应用于植物上的CRISPR/Cas9载体的构建方法的流程图。
具体实施方式
以下结合附图对本发明的原理和特征进行描述,所举实例只用于解释本发明,并非用于限定本发明的范围。需要说明的是,在不冲突的情况下,本申请的实施例及实施例中的特征可以相互组合。
本发明的目的在于提供一种能够应用于植物上的CRISPR/Cas9载体,该载体不仅能够作用于单个靶位点,而且能够同时作用于两个靶位点。为实现此目标,该CRISPR/Cas9载体由两个基本载体pSG和pCC组成,构建方法具体包含以下内容:
1.pSG载体的构建:
1)以pX330质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增sgRNA片段,回收该片段,标记为sgRNA1,引物序列如下:
(SEQ ID NO.1)Sg1-F:
GGAATTCATAGTTTCCCATGATTCCTTCATATTTGC(下划线标记的为EcoRI酶切位点);
(SEQ ID NO.2)Sg1-R:
TACCTCTAGAGCCATTTGTCTGC(下划线标记的为XbaI酶切位点);
2)使用EcoRI-HF和XbaI分别双酶切pUC19和sgRNA1,回收目的片段后按1:7的摩尔比进行连接,得到重组质粒pSG1,测序,保留序列完全正确的阳性质粒;
3)以pSG1质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增sgRNA片段,回收该片段,标记为sgRNA,引物序列如下:
(SEQ ID NO.3)Sg2-F:
ATATATGGTCTCAAATTGGATCCGGTACCGAATTCATAGTTTCCCATGATTCCT(下划线标记的为BsaI、BamHI、KpnI、EcoRI酶切位点);
(SEQ ID NO.4)Sg2-R:
ATATATGGTCTCACTAGGGATCCGGTACCCTCTAGAGCCATTTGTCTGCAGAATT(下划线标记的为BsaI、BamHI、KpnI、XbaI酶切位点);
4)使用EcoRI-HF和XbaI双酶切pUC19,使用BsaI酶切sgRNA,回收目的片段后按1:7的摩尔比进行连接,得到重组质粒pSG,测序,保留序列完全正确的阳性质粒,pSG载体的图谱如图1所示,pSG载体的部分序列如下所示(SEQ ID NO.16):
其中分别是M13fwd和M13rev引物序列,“____”是hU6promoter序列,是guide序列,是sgRNA scaffold序列,是hU6terminator序列。
2.pCC载体的构建
5)以pX330质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增hSpCas9片段,其中引物Cas-F:Cas-R1:Cas-R2=1.5:0.2:1.3,回收该片段,标记为hSpCas9,引物序列如下:
(SEQ ID NO.5)Cas-F:
CATGCCATGGACTATAAGGACCACGACGGAGACT(下划线标记的为NcoI酶切位点);
(SEQ ID NO.6)Cas-R1:
GACCTTCCGCTTCTTCTTTGGCTTTTTCTTTTTTGCCTGGCCGGCCT;
(SEQ ID NO.7)Cas-R2:
CAGGGTCACCTTAACCGACCTTCCGCTTCTTCTTTGGCT(下划线标记的分别为BstEII酶切位点和SV40核定位信号序列);
6)使用NcoI-HF和BstEII-HF分别双酶切pCAMBIA1302和hSpCas9,回收目的片段后按1:5的摩尔比进行连接,得到重组质粒pCC1,测序,保留序列完全正确的阳性质粒;
7)以pCAMBIA1302质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增CaMV 35enhanced promoter片段,回收该片段,标记为CaMV-ep,引物序列如下:
(SEQ ID NO.8)CaMV-ep-F:
CCCAAGCTTTTGCGTATTGGCTAGAGCAGCTTG(下划线标记的为HindIII酶切位点);
(SEQ ID NO.9)CaMV-ep-R:
CATGCCATGGCTCATTGCCCCCCGGGATCT(下划线标记的为NcoI酶切位点);
8)使用HindIII和NcoI分别双酶切pCC1和CaMV-ep,回收目的片段后按1:5的摩尔比进行连接,得到重组质粒pCC,测序,保留序列完全正确的阳性质粒,pCC载体的图谱如图2所示。
具体地,CRISPR/Cas9载体的构建方法如图3所示,包括:
S1:靶序列退火复性:根据选定的靶序列,合成互补的Oligo DNA,将合成的OligoDNA序列进行退火复性获得DNA双链序列,并稀释;
S2:PSG载体的酶切:采用限制性内切酶BbsI酶切pSG载体,酶切产物经超薄产物纯化试剂盒进行回收;
S3:连接和转化:配置连接体系,将S1获得的稀释后的DNA双链序列与S2获得的酶切产物进行连接反应,将获得的全部连接产物采用热激发转化至大肠杆菌JM109中;
S4:重组质粒的鉴定和提取:分别挑单菌落于LB/Amp液体培养基中震荡培养,分别以M13fwd和Oligo-R为引物进行菌液PCR鉴定,将验证正确的菌液转接到新鲜的LB/Amp液体培养基中,培养后进行质粒的提取,得到重组质粒;
S5:重组资料和PCC质粒的双酶切:将得到的重组质粒和PCC质粒进行双酶切,酶切产物经1%的琼脂糖凝胶电泳后,采用凝胶回收试剂盒分别回收目标片段;
S6:连接、转化和鉴定:配置连接体系,将S5获得的酶切回收目标片段进行连接反应,将获得的全部连接产物采用热激发转化至大肠杆菌JM109中,挑单菌落于LB/Kan液体培养基中震荡培养,并进行菌液PCR鉴定,将阳性菌液转接到新鲜的LB/Kan液体培养基中培养,提取质粒,即获得构建好的CRISPR/Cas9载体。
实施方式1
本实施方式提供了作用于单个位点的CRISPR/Cas9载体制备过程:
(1)靶序列退火复性。根据选定的靶序列,合成一对互补的Oligo DNA,序列为:Oligo-F(SEQ ID NO.10):CACCNNNNNNNNNNNNNNNNNNNN,Oligo-R(SEQ ID NO.11):AAACNNNNNNNNNNNNNNNNNNNN。将合成的Oligo序列按照表1进行退火复性,反应程序为:95℃变性5min,1℃/30s降温至25℃,4℃保存。将得到的DNA双链序列稀释至0.1μM。
表1靶序列退火复性的反应体系
(2)pSG质粒的酶切。采用限制性内切酶BbsI酶切pSG载体,反应体系100μL,如表2所示,37℃反应过夜,65℃反应20min,酶切产物经超薄产物纯化试剂盒进行回收,并使用核酸蛋白仪测定浓度。
表2 BbsI酶切pSG载体的反应体系
(3)连接和转化。按照表3配置连接体系,16℃反应30min后4℃反应过夜;将全部连接产物采用热激发转化至大肠杆菌JM109中。
表3复性产物与pSG酶切片段的连接反应体系
(4)重组质粒的鉴定和提取。挑单菌落于800μl的LB/Amp液体培养基中,37℃振荡培养。以M13fwd和Oligo-R为引物进行菌液PCR鉴定,将验证正确的菌液转接到新鲜的LB/Amp液体培养基中,培养后进行质粒的提取,得到重组质粒pSG-CZ。
(5)pSG-CZ和pCC质粒的双酶切。将得到的pSG-CZ重组质粒、pCC质粒分别采用EcoRI-HF和XbaI进行双酶切,37℃酶切3h后65℃反应20min;酶切产物经1%的琼脂糖凝胶电泳后,采用凝胶回收试剂盒分别回收目标片段,并用核酸蛋白仪测定浓度。
(6)连接、转化和鉴定。按照表4配置连接体系,16℃反应30min后4℃反应过夜;将全部连接产物采用热激发转化至大肠杆菌JM109中;挑单菌落于800μl的LB/Kan液体培养基中,37℃振荡培养;以M13rev和Oligo-R为引物进行菌液PCR鉴定,将阳性菌液转接到新鲜的LB/Kan液体培养基中培养,提取质粒,-20℃保存。该质粒即为构建好的作用于单个位点的CRISPR/Cas9载体,可用于下一步的遗传转化试验。
表4酶切回收片段的连接反应体系
实施方式2
本实施方式提供了作用于两个位点的CRISPR/Cas9载体制备过程:
(1)靶序列退火复性。根据选定的靶序列,合成两对互补的Oligo DNA,序列为:
Oligo1-F(SEQ ID NO.12):CACCNNNNNNNNNNNNNNNNNNNN;
Oligo1-R(SEQ ID NO.13):AAACNNNNNNNNNNNNNNNNNNNN;
Oligo2-F(SEQ ID NO.14):CACCNNNNNNNNNNNNNNNNNNNN;
Oligo2-R(SEQ ID NO.15):AAACNNNNNNNNNNNNNNNNNNNN;
将合成的Oligo序列分别按照表5进行退火复性,反应程序为:95℃变性5min,1℃/30s降温至25℃,4℃保存;将得到的DNA双链序列稀释至0.1μM。
表5靶序列退火复性的反应体系
(2)pSG质粒的酶切。采用限制性内切酶BbsI酶切pSG载体,反应体系100μL(表6),37℃反应过夜,65℃反应20min,酶切产物经超薄产物纯化试剂盒进行回收,并使用核酸蛋白仪测定浓度。
表6 BbsI酶切pSG载体的反应体系
(3)连接和转化。按照表7分别配置连接体系,16℃反应30min后4℃反应过夜。将全部连接产物采用热激发转化至大肠杆菌JM109中。
表7复性产物与pSG酶切片段的连接反应体系
(4)重组质粒的鉴定和提取。分别挑单菌落于800μl的LB/Amp液体培养基中,37℃振荡培养;分别以M13fwd和Oligo-R为引物进行菌液PCR鉴定,将验证正确的菌液转接到新鲜的LB/Amp液体培养基中,培养后进行质粒的提取,得到重组质粒pSG-CZ1和pSG-CZ2。
(5)pSG-CZ1、pSG-CZ2和pCC质粒的双酶切。将得到的pSG-CZ1重组质粒采用EcoRI-HF和KpnI进行双酶切,pSG-CZ2重组质粒采用XbaI和KpnI进行双酶切;或将得到的pSG-CZ1重组质粒采用EcoRI-HF和BamHI进行双酶切,pSG-CZ2重组质粒采用XbaI和BamHI进行双酶切;将pCC质粒采用EcoRI-HF和XbaI进行双酶切,37℃酶切3h后65℃反应20min。酶切产物经1%的琼脂糖凝胶电泳后,采用凝胶回收试剂盒分别回收目标片段,并用核酸蛋白仪测定浓度。
(6)连接、转化和鉴定。按照表8配置连接体系,16℃反应30min后4℃反应过夜;将全部连接产物采用热激发转化至大肠杆菌JM109中;挑单菌落于800μl的LB/Kan液体培养基中,37℃振荡培养;以Oligo1-F和Oligo2-R为引物进行菌液PCR鉴定,将阳性菌液转接到新鲜的LB/Kan液体培养基中培养,提取质粒,-20℃保存。该质粒即为构建好的作用于两个位点的CRISPR/Cas9载体,可用于下一步的遗传转化试验。
表8酶切回收片段的连接反应体系
以上所述仅为本发明的较佳实施例,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
SEQUENCE LISTING
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Claims (10)

1.一种应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,包括:
S1:靶序列退火复性:根据选定的靶序列,合成互补的Oligo DNA,将合成的Oligo DNA序列进行退火复性获得DNA双链序列,并稀释;
S2:PSG载体的酶切:采用限制性内切酶BbsI酶切pSG载体,酶切产物经超薄产物纯化试剂盒进行回收;
S3:连接和转化:配置连接体系,将S1获得的稀释后的DNA双链序列与S2获得的酶切产物进行连接反应,将获得的全部连接产物采用热激发转化至大肠杆菌JM109中;
S4:重组质粒的鉴定和提取:分别挑单菌落于LB/Amp液体培养基中震荡培养,分别以M13fwd和Oligo-R为引物进行菌液PCR鉴定,将验证正确的菌液转接到新鲜的LB/Amp液体培养基中,培养后进行质粒的提取,得到重组质粒;
S5:重组资料和PCC质粒的双酶切:将得到的重组质粒和PCC质粒进行双酶切,酶切产物经1%的琼脂糖凝胶电泳后,采用凝胶回收试剂盒分别回收目标片段;
S6:连接、转化和鉴定:配置连接体系,将S5获得的酶切回收目标片段进行连接反应,将获得的全部连接产物采用热激发转化至大肠杆菌JM109中,挑单菌落于LB/Kan液体培养基中震荡培养,并进行菌液PCR鉴定,将阳性菌液转接到新鲜的LB/Kan液体培养基中培养,提取质粒,即获得构建好的CRISPR/Cas9载体。
2.根据权利要求1所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,所述PSG载体的构建包括:
以pX330质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增sgRNA片段,回收该片段,标记为sgRNA1,引物序列为SEQ ID NO.1所示的Sg1-F和SEQ ID NO.2所示的Sg1-R;
使用EcoRI-HF和XbaI分别双酶切pUC19和sgRNA1,回收目的片段后按1:7的摩尔比进行连接,得到重组质粒pSG1,测序,保留序列完全正确的阳性质粒;
以pSG1质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增sgRNA片段,回收该片段,标记为sgRNA,引物序列为SEQ ID NO.3所示的Sg2-F和SEQ ID NO.4所示的Sg2-R;
使用EcoRI-HF和XbaI双酶切pUC19,使用BsaI酶切sgRNA,回收目的片段后按1:7的摩尔比进行连接,得到重组质粒pSG,测序,保留序列完全正确的阳性质粒。
3.根据权利要求2所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,所述PCC载体的构建包括:
以pX330质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增hSpCas9片段,其中引物Cas-F:Cas-R1:Cas-R2=1.5:0.2:1.3,回收该片段,标记为hSpCas9,Cas-F的序列如SEQ ID NO.5所示,Cas-R1的序列如SEQ ID NO.6所示,Cas-R2的序列如SEQ ID NO.7所示;
使用NcoI-HF和BstEII-HF分别双酶切pCAMBIA1302和hSpCas9,回收目的片段后按1:5的摩尔比进行连接,得到重组质粒pCC1,测序,保留序列完全正确的阳性质粒;
以pCAMBIA1302质粒为模板,使用高保真酶PrimeSTAR HS DNA Polymerase扩增CaMV35enhanced promoter片段,回收该片段,标记为CaMV-ep,引物序列为SEQ ID NO.8所示的CaMV-ep-F和SEQ ID NO.9所示的CaMV-ep-R;
使用HindIII和NcoI分别双酶切pCC1和CaMV-ep,回收目的片段后按1:5的摩尔比进行连接,得到重组质粒pCC,测序,保留序列完全正确的阳性质粒。
4.根据权利要求3所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,在步骤S1中,合成一对互补的Oligo DNA,即序列为SEQ ID NO.10所示的Oligo-F和序列为SEQ ID NO.11所示的Oligo-R。
5.根据权利要求3所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,在步骤S1中,合成两对互补的Oligo DNA,分别为序列为SEQ ID NO.12所示的Oligo1-F,序列为SEQ ID NO.13所示的Oligo1-R,序列为SEQ ID NO.14所示的Oligo2-F及序列为SEQ IDNO.15所示的Oligo2-R。
6.根据权利要求4或5所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,在步骤S1中,将所述合成的Oligo DNA序列进行退火复性的反应程序为:95℃变性5min,每30s降温1℃,降温至25℃,并于4℃保存;
在所述步骤S2中,PSG载体的酶切的反应体系为100μL,37℃反应过夜,65℃反应20min。
7.根据权利要求4所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,在所述步骤S4中,所得到的重组质粒为pSG-CZ;在所述步骤S5中,将得到的pSG-CZ重组质粒、pCC质粒分别采用EcoRI-HF和XbaI进行双酶切,37℃酶切3h后,65℃反应20min得到所述酶切产物。
8.根据权利要求5所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,在所述步骤S4中,所得到的重组质粒为pSG-CZ1和pSG-CZ2;所述步骤S5中,将得到的pSG-CZ1重组质粒采用EcoRI-HF和KpnI进行双酶切,pSG-CZ2重组质粒采用XbaI和KpnI进行双酶切;或将得到的pSG-CZ1重组质粒采用EcoRI-HF和BamHI进行双酶切,pSG-CZ2重组质粒采用XbaI和BamHI进行双酶切;并将pCC质粒采用EcoRI-HF和XbaI进行双酶切,37℃酶切3h后,65℃反应20min,得到所述酶切产物。
9.根据权利要求4或7所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,在所述步骤S6中,所述菌液PCR鉴定以M13rev和Oligo-R为引物。
10.根据权利要求5或8所述的应用于植物上的CRISPR/Cas9载体的构建方法,其特征在于,在所述步骤S6中,所述菌液PCR鉴定以Oligo1-F和Oligo2-R为引物。
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