一种新型基因组编辑工具(Lb2Cas12a-RVR)及其构建方法和应用方法
阅读说明:本技术 一种新型基因组编辑工具(Lb2Cas12a-RVR)及其构建方法和应用方法 (Novel genome editing tool (Lb2Cas12a-RVR) and construction method and application method thereof ) 是由 谷峰 刘潇宇 林莉 于 2020-01-15 设计创作,主要内容包括:本发明公开了一种新型基因组编辑工具(Lb2Cas12a-RVR)及其构建方法和应用方法,其技术方案要点是包括包括编码表达Lb2Cas12a-RVR突变型蛋白编码质粒pcDNA3.1-hLb2Cas12a-RVR,编码蛋白的DNA序列如SEQ ID NO.1所示,该新型改造的基因组编辑工具及其构建方法和应用方法,以解决在精确位点特异性基因编辑的低活性和低保真性的问题,有助于临床肿瘤治疗靶标的筛选,药物开发,致病突变纠正等进行深入研究,其在人类细胞中具有基因组编辑活性,并且具有更好的的PAM灵活性、高保真度和特殊的切割方式。(The invention discloses a novel genome editing tool (Lb2Cas12a-RVR) and a construction method and an application method thereof, and the technical scheme is characterized by comprising a mutant protein coding plasmid pcDNA3.1-hLb2Cas12a-RVR for coding and expressing Lb2Cas12a-RVR, wherein the DNA sequence of the coding protein is shown as SEQ ID NO. 1.)
技术领域
本发明涉及一种新型基因组编辑工具(Lb2Cas12a-RVR)及其构建方法和应用方法。
背景技术
作为新型的基因组编辑工具,CRISPR家族新成员Cas12a近几年来受到广泛的关注,并在人类细胞以及动植物模型的基因治疗领域崭露头角。Cas12a介导的靶向基因组工程技术已经实现了广泛的研究和医学应用。然而现有的研究多集中于FnCas12a,AsCas12a和LbCas12a,受限于此,哺乳动物相关的基因组编辑研究也多围绕AsCas12a和LbCas12a展开,然而,对于在精确位点特异性的人类基因组编辑中的广泛应用,有限的靶选择谱和低活性、低保真度仍将是其介导应用的瓶颈。因此,迫切需要开发具有用于操纵人类基因组的改进特征的新型Cas12a核酸酶。
此外,细胞基因组在染色体自我复制的过程中由于受到各种内源性或者外源性因素的影响,存在多种形式的损伤,并由此引发一系列细胞学反应。DNA的损伤类型很多,其中以DNA双链断裂(double strand break,DSB)最为严重。且DNA DSB的修复比其他类型的DNA损伤更加困难,不修复则可能导致染色体断裂和细胞死亡,而错误修复则可能导致染色体缺失、重排、转位和倒置等。DNA损伤的不完全修复可导致基因组不稳定,机体细胞为了对抗损伤,进化出多个修复系统来确保基因组的完整性,其中同源重组修复(homologousrecombination repair,HDR)是DNA DSB损伤修复的主要方式。HDR主要发生在有丝***的S期和G2监测点,因DNA DSB而导致断裂DNA末端与姐妹染色单体进行结合并进行修复。
基于申请者之前的研究(Tu,M.et al.A'new lease of life':FnCpf1 possessesDNAcleavage activity for genome editing in human cells.Nucleic acidsresearch.2017;45(19):11295-304),申请者高度怀疑三个Cas12a同源蛋白(Lb2Cas12a,PcCas12a和PmCas12a)具有基因组编辑活性,尽管最初的研究(Zetsche B.et al.Cpf1 isa single RNA-guided endonuclease of a class 2 CRISPR-Cas system.Cell.2015;163(3):759-71))将它们排除在现有的被广泛接受的基因组编辑工具之外。因此,将其开发为更高效的人类基因组编辑工具,能够极大地扩充申请者对基因编辑器的应用,Lb2Cas12a及突变体在基础研究、临床治疗、微生物育种、植物育种等具有广拓的应用,尤其是为临床疾病治疗提供强有力的研究工具。
发明内容
针对现有技术存在的不足,本发明的目的在于提供一种新型改造的基因组编辑工具及其构建方法和应用方法,该新型改造的基因组编辑工具及其构建方法和应用方法,以解决在精确位点特异性基因编辑的低活性和低保真性的问题,有助于临床肿瘤治疗靶标的筛选,药物开发,致病突变纠正等进行深入研究。其在人类细胞中具有基因组编辑活性,并且具有更好的的PAM灵活性、高保真度和特殊的切割方式。
为实现上述目的,本发明提供了如下技术方案:一种新型改造的基因组编辑工具,包括编码表达Lb2Cas12a-RVR突变型蛋白编码质粒pcDNA3.1-hLb2Cas12a-RVR,编码蛋白的DNA序列如SEQ ID NO.1所示。
一种基因编辑工具的构建方法,包括以下步骤:
步骤21:包括引物,所述引物上设置相应突变,所述引物序列如SEQ ID NO.7所示;
步骤22:从pY011(pcDNA3.1-hLb2Cpf1)载体上扩增片段1,序列如SEQ ID NO.2,扩增片段2,序列如SEQ ID NO.3;
步骤23:将扩增后的片段与骨架通过ClonExpress II One Step Cloning Kit得到突变后载体pcDNA3.1-hLb2Cas12a-RVR。
一种Lb2Cas12a-RVR基因编辑工具的应用方法,包括以下步骤:
步骤33:包括构建针对某致病基因DNA靶点的crRNA,在真核细胞中共引入crRNA和Lb2Cas12a-RVR表达载体,使其在靶位点发生原位修复;
步骤34:构建评估Lb2Cas12a-RVR编辑活性、效率和保真性的GFP报告系统,其利用的GFP基因序列为SEQ ID NO.4;
步骤35:构建Lb2Cas12a-RVR基因修复模板RS1-GFP细胞系,其利用的RS1-GFP基因序列为SEQ ID NO.5;
步骤36:对于处理后的真核细胞基因组DNA进行抽提,然后利用针对靶点的特异性引物进行PCR扩增,利用基因组DNA的PCR产物构建高通量测序DNA文库,并进行高通量测序。
本发明的有益效果:通过
附图说明
图1为pcDNA3.1-hLb2Cas12a-RVR质粒模式图;
图2为pSin-GFP质粒模式图;
图3为pSin-RS1-GFP质粒模式图;
图4为pcDNA3.1-hLb2Cas12a-RVR在RS1基因中进行HDR修复的结果。
具体实施方式
下面结合附图和实施例,对本发明进一步详细说明。其中相同的零部件用相同的附图标记表示。需要说明的是,下面描述中使用的词语“前”、“后”、“左”、“右”、“上”和“下”指的是附图中的方向,词语“底面”和“顶面”、“内”和“外”分别指的是朝向或远离特定部件几何中心的方向。
参照图1至4所示,本实施例的一种新型改造的基因组编辑工具,包括编码表达Lb2Cas12a-RVR突变型蛋白编码质粒pcDNA3.1-hLb2Cas12a-RVR,编码蛋白的DNA序列如SEQID NO.1所示。
上述改进具体为:SEQ ID NO.1 Lb2Cas12a-RVR基因序列(人工合成)
atgtactatgagtccctgaccaagcagtaccccgtgtctaagacaatccggaatgagctgatccctatcggcaagacactggataacatccgccagaacaatatcctggagagcgacgtgaagcggaagcagaactacgagcacgtgaagggcatcctggatgagtatcacaagcagctgatcaacgaggccctggacaattgcaccctgccatccctgaagatcgccgccgagatctacctgaagaatcagaaggaggtgtctgacagagaggatttcaacaagacacaggacctgctgaggaaggaggtggtggagaagctgaaggcccacgagaactttaccaagatcggcaagaaggacatcctggatctgctggagaagctgccttccatctctgaggacgattacaatgccctggagagcttccgcaacttttacacctatttcacatcctacaacaaggtgcgggagaatctgtattctgataaggagaagagctccacagtggcctacagactgatcaacgagaatttcccaaagtttctggacaatgtgaagagctataggtttgtgaaaaccgcaggcatcctggcagatggcctgggagaggaggagcaggactccctgttcatcgtggagacattcaacaagaccctgacacaggacggcatcgatacctacaattctcaagtgggcaagatcaactctagcatcaatctgtataaccagaagaatcagaaggccaatggcttcagaaagatccccaagatgaagatgctgtataagcagatcctgtccgatagggaggagtctttcatcgacgagtttcagagcgatgaggtgctgatcgacaacgtggagtcttatggcagcgtgctgatcgagtctctgaagtcctctaaggtgagcgccttctttgatgccctgagagagtctaagggcaagaacgtgtacgtgaagaatgacctggccaagacagccatgagcaacatcgtgttcgagaattggaggacctttgacgatctgctgaaccaggagtacgacctggccaacgagaacaagaagaaggacgataagtatttcgagaagcgccagaaggagctgaagaagaataagagctactccctggagcacctgtgcaacctgtccgaggattcttgtaacctgatcgagaattatatccaccagatctccgacgatatcgagaatatcatcatcaacaatgagacattcctgcgcatcgtgatcaatgagcacgacaggtcccgcaagctggccaagaaccggaaggccgtgaaggccatcaaggactttctggattctatcaaggtgctggagcgggagctgaagctgatcaacagctccggccaggagctggagaaggatctgatcgtgtactctgcccacgaggagctgctggtggagctgaagcaggtggacagcctgtataacatgaccagaaattatctgacaaagaagcctttctctaccgagaaggtgaagctgaactttaatcgcagcacactgctgCGcggctgggatcggaatGTggagacagacCGcctgggcgtgctgctgctgaaggacggcaagtactatctgggcatcatgaacacaagcgccaataaggccttcgtgaatccccctgtggccaagaccgagaaggtgtttaagaaggtggattacaagctgctgccagtgcccaaccagatgctgccaaaggtgttctttgccaagagcaatatcgacttctataacccctctagcgagatctactccaattataagaagggcacccacaagaagggcaatatgttttccctggaggattgtcacaacctgatcgacttctttaaggagtctatcagcaagcacgaggactggagcaagttcggctttaagttcagcgatacagcctcctacaacgacatctccgagttctatcgcgaggtggagaagcagggctacaagctgacctatacagacatcgatgagacatacatcaatgatctgatcgagcggaacgagctgtacctgttccagatctataataaggactttagcatgtactccaagggcaagctgaacctgcacacactgtatttcatgatgctgtttgatcagcgcaatatcgacgacgtggtgtataagctgaacggagaggcagaggtgttctataggccagcctccatctctgaggacgagctgatcatccacaaggccggcgaggagatcaagaacaagaatcctaaccgggccagaaccaaggagacaagcaccttcagctacgacatcgtgaaggataagcggtatagcaaggataagtttaccctgcacatccccatcacaatgaacttcggcgtggatgaggtgaagcggttcaacgacgccgtgaacagcgccatccggatcgatgagaatgtgaacgtgatcggcatcgaccggggcgagagaaatctgctgtacgtggtggtcatcgactctaagggcaacatcctggagcagatctccctgaactctatcatcaataaggagtacgacatcgagacagattatcacgcactgctggatgagagggagggcggcagagataaggcccggaaggactggaacaccgtggagaatatcagggacctgaaggccggctacctgagccaggtggtgaacgtggtggccaagctggtgctgaagtataatgccatcatctgcctggaggacctgaactttggcttcaagaggggccgccagaaggtggagaagcaggtgtaccagaagttcgagaagatgctgatcgataagctgaattacctggtcatcgacaagagccgcgagcagacatcccctaaggagctgggaggcgccctgaacgcactgcagctgacctctaagttcaagagctttaaggagctgggcaagcagtccggcgtgatctactatgtgcctgcctacctgacctctaagatcgatccaaccacaggcttcgccaatctgttttatatgaagtgtgagaacgtggagaagtccaagagattctttgacggctttgatttcatcaggttcaacgccctggagaacgtgttcgagttcggctttgactaccggagcttcacccagagggcctgcggcatcaattccaagtggaccgtgtgcaccaacggcgagcgcatcatcaagtatcggaatccagataagaacaatatgttcgacgagaaggtggtggtggtgaccgatgagatgaagaacctgtttgagcagtacaagatcccctatgaggatggcagaaatgtgaaggacatgatcatcagcaacgaggaggccgagttctaccggagactgtataggctgctgcagcagaccctgcagatgagaaacagcacctccgacggcacaagggattacatcatctcccctgtgaagaataagagagaggcctacttcaacagcgagctgtccgacggctctgtgccaaaggacgccgatgccaacggcgcctacaatatcgccagaaagggcctgtgggtgctggagcagatcaggcagaagagcgagggcgagaagatcaatctggccatgaccaacgccgagtggctggagtatgcccagacacacctgctgaaaaggccggcggccacgaaaaaggccggccaggcaaaaaagaaaaagggatcctacccatacgatgttccagattacgcttatccctacgacgtgcctgattatgcatacccatatgatgtccccgactatgcctaa
本实施例的一种基因编辑工具的构建方法,包括以下步骤:
步骤21:包括引物,所述引物上设置相应突变,所述引物序列如SEQ ID NO.7所示;
步骤22:从pY011(pcDNA3.1-hLb2Cpf1)载体上扩增片段1,序列如SEQ ID NO.2,扩增片段2,序列如SEQ ID NO.3;
步骤23:将扩增后的片段与骨架通过ClonExpress II One Step Cloning Kit得到突变后载体pcDNA3.1-hLb2Cas12a-RVR。
上述改进具体为:SEQ ID NO.2扩增片段1序列(人工合成)
atgtactatgagtccctgaccaagcagtaccccgtgtctaagacaatccggaatgagctgatccctatcggcaagacactggataacatccgccagaacaatatcctggagagcgacgtgaagcggaagcagaactacgagcacgtgaagggcatcctggatgagtatcacaagcagctgatcaacgaggccctggacaattgcaccctgccatccctgaagatcgccgccgagatctacctgaagaatcagaaggaggtgtctgacagagaggatttcaacaagacacaggacctgctgaggaaggaggtggtggagaagctgaaggcccacgagaactttaccaagatcggcaagaaggacatcctggatctgctggagaagctgccttccatctctgaggacgattacaatgccctggagagcttccgcaacttttacacctatttcacatcctacaacaaggtgcgggagaatctgtattctgataaggagaagagctccacagtggcctacagactgatcaacgagaatttcccaaagtttctggacaatgtgaagagctataggtttgtgaaaaccgcaggcatcctggcagatggcctgggagaggaggagcaggactccctgttcatcgtggagacattcaacaagaccctgacacaggacggcatcgatacctacaattctcaagtgggcaagatcaactctagcatcaatctgtataaccagaagaatcagaaggccaatggcttcagaaagatccccaagatgaagatgctgtataagcagatcctgtccgatagggaggagtctttcatcgacgagtttcagagcgatgaggtgctgatcgacaacgtggagtcttatggcagcgtgctgatcgagtctctgaagtcctctaaggtgagcgccttctttgatgccctgagagagtctaagggcaagaacgtgtacgtgaagaatgacctggccaagacagccatgagcaacatcgtgttcgagaattggaggacctttgacgatctgctgaaccaggagtacgacctggccaacgagaacaagaagaaggacgataagtatttcgagaagcgccagaaggagctgaagaagaataagagctactccctggagcacctgtgcaacctgtccgaggattcttgtaacctgatcgagaattatatccaccagatctccgacgatatcgagaatatcatcatcaacaatgagacattcctgcgcatcgtgatcaatgagcacgacaggtcccgcaagctggccaagaaccggaaggccgtgaaggccatcaaggactttctggattctatcaaggtgctggagcgggagctgaagctgatcaacagctccggccaggagctggagaaggatctgatcgtgtactctgcccacgaggagctgctggtggagctgaagcaggtggacagcctgtataacatgaccagaaattatctgacaaagaagcctttctctaccgagaaggtgaagctgaactttaatcgcagcacactgctgCGcggctgggatcggaatGTggagacagacCGcctg
SEQ ID NO.3扩增片段2序列(人工合成)
ggcgtgctgctgctgaaggacggcaagtactatctgggcatcatgaacacaagcgccaataaggccttcgtgaatccccctgtggccaagaccgagaaggtgtttaagaaggtggattacaagctgctgccagtgcccaaccagatgctgccaaaggtgttctttgccaagagcaatatcgacttctataacccctctagcgagatctactccaattataagaagggcacccacaagaagggcaatatgttttccctggaggattgtcacaacctgatcgacttctttaaggagtctatcagcaagcacgaggactggagcaagttcggctttaagttcagcgatacagcctcctacaacgacatctccgagttctatcgcgaggtggagaagcagggctacaagctgacctatacagacatcgatgagacatacatcaatgatctgatcgagcggaacgagctgtacctgttccagatctataataaggactttagcatgtactccaagggcaagctgaacctgcacacactgtatttcatgatgctgtttgatcagcgcaatatcgacgacgtggtgtataagctgaacggagaggcagaggtgttctataggccagcctccatctctgaggacgagctgatcatccacaaggccggcgaggagatcaagaacaagaatcctaaccgggccagaaccaaggagacaagcaccttcagctacgacatcgtgaaggataagcggtatagcaaggataagtttaccctgcacatccccatcacaatgaacttcggcgtggatgaggtgaagcggttcaacgacgccgtgaacagcgccatccggatcgatgagaatgtgaacgtgatcggcatcgaccggggcgagagaaatctgctgtacgtggtggtcatcgactctaagggcaacatcctggagcagatctccctgaactctatcatcaataaggagtacgacatcgagacagattatcacgcactgctggatgagagggagggcggcagagataaggcccggaaggactggaacaccgtggagaatatcagggacctgaaggccggctacctgagccaggtggtgaacgtggtggccaagctggtgctgaagtataatgccatcatctgcctggaggacctgaactttggcttcaagaggggccgccagaaggtggagaagcaggtgtaccagaagttcgagaagatgctgatcgataagctgaattacctggtcatcgacaagagccgcgagcagacatcccctaaggagctgggaggcgccctgaacgcactgcagctgacctctaagttcaagagctttaaggagctgggcaagcagtccggcgtgatctactatgtgcctgcctacctgacctctaagatcgatccaaccacaggcttcgccaatctgttttatatgaagtgtgagaacgtggagaagtccaagagattctttgacggctttgatttcatcaggttcaacgccctggagaacgtgttcgagttcggctttgactaccggagcttcacccagagggcctgcggcatcaattccaagtggaccgtgtgcaccaacggcgagcgcatcatcaagtatcggaatccagataagaacaatatgttcgacgagaaggtggtggtggtgaccgatgagatgaagaacctgtttgagcagtacaagatcccctatgaggatggcagaaatgtgaaggacatgatcatcagcaacgaggaggccgagttctaccggagactgtataggctgctgcagcagaccctgcagatgagaaacagcacctccgacggcacaagggattacatcatctcccctgtgaagaataagagagaggcctacttcaacagcgagctgtccgacggctctgtgccaaaggacgccgatgccaacggcgcctacaatatcgccagaaagggcctgtgggtgctggagcagatcaggcagaagagcgagggcgagaagatcaatctggccatgaccaacgccgagtggctggagtatgcccagacacacctgctgaaaaggccggcggccacgaaaaaggccggccaggcaaaaaagaaaaagggatcctacccatacgatgttccagattacgcttatccctacgacgtgcctgattatgcatacccatatgatgtccccgactatgcctaa
SEQ ID NO.6 crRNA序列(人工合成)
SEQ ID NO.7引物序列(人工合成)
实施例1:pcDNA3.1-hLb2Cas12a-RVR质粒构建
(1)利用PCR方法,在引物上设置相应突变N512R+K518V+N522R,pY011(pcDNA3.1-hLb2Cas12a)载体上扩增含RVR突变位点的序列,将扩增后的片段与骨架通过ClonExpressII One Step Cloning Kit得到突变后载体pcDNA3.1-hLb2Cas12a-RVR。
(2)质粒构建实验中所用到的PCR体系如下:
Template:10ng;Forward Primer:(10μM)1μl;Reverse Primer:(10μM)1μl;
dNTP:0.5μl;DNA polymerase(Vazyme,P501):0.5μl;5x Buffer:10μl;RNase-Water补齐至50μl。
PCR程序如下:
95℃,3min;95℃,15sec,60℃,15sec,72℃,1min;35cycles;72℃,3min。
本实施例的一种Lb2Cas12a-RVR基因编辑工具的应用方法:
步骤33:包括构建针对某致病基因DNA靶点的crRNA,在真核细胞中共引入crRNA和Lb2Cas12a-RVR表达载体,使其在靶位点发生原位修复;
步骤34:构建评估Lb2Cas12a-RVR编辑活性、效率和保真性的GFP报告系统,其利用的GFP基因序列为SEQ ID NO.4;
步骤35:构建Lb2Cas12a-RVR基因修复模板RS1-GFP细胞系,其利用的RS1-GFP基因序列为SEQ ID NO.5;
步骤36:对于处理后的真核细胞基因组DNA进行抽提,然后利用针对靶点的特异性引物进行PCR扩增,利用基因组DNA的PCR产物构建高通量测序DNA文库,并进行高通量测序。
上述改进具体为:SEQ ID NO.4 GFP序列(人工合成)
ctgttcaccggggtggtgcccatcctggtcgagctggacggcgacgtaaacggccacaagttcagcgtgtccggcgagggcgagggcgatgccacctacggcaagctgaccctgaagttcatctgcaccaccggcaagctgcccgtgccctggcccaccctcgtgaccaccctgacctacggcgtgcagtgcttcagccgctaccccgaccacatgaagcagcacgacttcttcaagtccgccatgcccgaaggctacgtccaggagcgcaccatcttcttcaaggacgacggcaactacaagacccgcgccgaggtgaagttcgagggcgacaccctggtgaaccgcatcgagctgaagggcatcgacttcaaggaggacggcaacatcctggggcacaagctggagtacaactacaacagccacaacgtctatatcatggccgacaagcagaagaacggcatcaaggtgaacttcaagatccgccacaacatcgaggacggcagcgtgcagctcgccgaccactaccagcagaacacccccatcggcgacggccccgtgctgctgcccgacaaccactacctgagcacccagtccgccctgagcaaagaccccaacgagaagcgcgatcacatggtcctgctggagttcgtgaccgccgccgggatcactctcggcatggacgagctgtacaagtccggactcagatctcgataa
SEQ ID NO.5 RS1-GFP序列(人工合成)
atgtctgctggagctacctccttagactgtattccagaatgcccttagcacaagcccctgggtttcgagtcaggggaggtcgtgagcaagggcgaggagctgttcaccggggtggtgcccatcctggtcgagctggacggcgacgtaaacggccacaagttcagcgtgtccggcgagggcgagggcgatgccacctacggcaagctgaccctgaagttcatctgcaccaccggcaagctgcccgtgccctggcccaccctcgtgaccaccctgacctacggcgtgcagtgcttcagccgctaccccgaccacatgaagcagcacgacttcttcaagtccgccatgcccgaaggctacgtccaggagcgcaccatcttcttcaaggacgacggcaactacaagacccgcgccgaggtgaagttcgagggcgacaccctggtgaaccgcatcgagctgaagggcatcgacttcaaggaggacggcaacatcctggggcacaagctggagtacaactacaacagccacaacgtctatatcatggccgacaagcagaagaacggcatcaaggtgaacttcaagatccgccacaacatcgaggacggcagcgtgcagctcgccgaccactaccagcagaacacccccatcggcgacggccccgtgctgctgcccgacaaccactacctgagcacccagtccgccctgagcaaagaccccaacgagaagcgcgatcacatggtcctgctggagttcgtgaccgccgccgggatcactctcggcatggacgagctgtacaagtccggactcagatctcgataa
实施例2:pcDNA3.1-hLb2Cas12a-RVR活性测试GFP报告系统的建立
(1)构建pSin-GFP慢病毒载体,其包含GFP基因(如SEQ ID NO.4所示),IRES和嘌呤霉素(Puromycin)抗性基因。pSin-GFP和辅助质粒共转HEK-293T细胞,收集病毒上清,0.45μm滤膜过滤,分装后于-80℃保存备用。
(2)HEK-293细胞复苏:把冻存HEK-293细胞的管从液氮中取出来,立即投入37℃水浴锅中,轻微摇动,待液体完全融化后(大概1~1.5min),取出用75%的酒精擦拭消毒后放置于超净工作台;把上述细胞悬液转移至装有5ml培养基的15ml的离心管中,1500rpm,离心5min;弃上清,加1ml培养基重悬细胞。转移至装有10ml培养基的10cm培养皿中前后左右轻轻摇动,使细胞均匀分布在培养皿中;
标好细胞种类和日期、培养人姓名等,放到37℃,5%的CO2培养箱中培养,待细胞贴壁后更换培养基。完全培养基的配制:DMEM(高糖)+10%FBS(胎牛血清)+1%Pen./Strep.(青霉素100U/ml,链霉素100μg/ml)
(3)用胰蛋白酶消化对数生长期的HEK-293细胞,细胞计数后接种于6孔板,调整细胞密度为3.0×105个细胞/孔;根据慢病毒滴度测定结果,感染适量的慢病毒pSin-GFP,同时加终浓度为4μg/ml的polybrene;感染慢病毒12h后换液,48h后传代到10cm皿,用1μg/ml浓度的抗生素Puromycin筛选;10d后,在显微镜下挑取单克隆细胞,获得整合有RS1-GFP基因的单克隆HEK-293-GFP细胞系。
(4)单克隆HEK-293-GFP细胞扩大培养,该克隆中GFP基因的拷贝数经过qPCR检测,确定为单拷贝,即HEK-293-SC1细胞。
辅助质粒为pVSVg和psPAX2(申请人实验室保存)。
慢病毒pSin-GFP,保存于-80℃。
实施例3:pcDNA3.1-hLb2Cas12a-RVR在特定位点效率的测定
(1)pJET-U6-sgRNA设计:在GFP基因序列的不同位点,根据后续评估要求设计crRNA;
(2)HEK-293-SC1细胞计数后接种于12孔板,每孔的细胞密度为1.8×105个细胞/孔;
(3)细胞生长24h后通过转染试剂TurboFect(Thermo Fisher,#R0531)转染pcDNA3.1-hLb2Cas12a-RVR(750ng)和pJET-U6-crRNA(250ng);
(4)真核细胞转染方法:将需要转染的质粒按比例混合好后,再混入含有1.5μl转染试剂Turbofect的50μl DMEM,吹打混匀,并在室温放置15min后,加入含有1ml DMEM(Gibco,C11995500CP)+10%FBS(Gibco,16000 044)培养基,和1.8×105个细胞/孔的HEK-293-SC1细胞的12孔板中进行转染。
(5)转染后24h更换新鲜的培养基,48h后收集细胞,通过流式细胞术检测绿色荧光细胞的比率,根据比率判断Lb2Cas12a-RVR在特定位点的可用性。
实施例4:Lb2Cas12a-RVR基因修复模板RS1-GFP细胞系的建立
1、重组载体pSin-RS1-GFP的构建方法为:
通过PCR扩增RS1-GFP基因(如SEQ ID NO.5所示),克隆到pSin-EF2-LIN28-Pur载体上,得到重组pSin-RS1-GFP载体。
pSin-EF2-LIN28-Pur载体的制备方法见http://www.addgene.org/16580,为已知技术。
2、获得整合有RS1-GFP基因的单克隆HEK-293细胞系的方法为:
(1)HEK-293细胞计数后接种于6孔板,每孔的细胞密度为3.0×105个细胞/孔;
(2)细胞生长24h后,在6孔板中加入适量的慢病毒pSin-RS1-GFP,同时加终浓度为4μg/ml的聚凝胺(polybrene);
(3)HEK-293细胞感染慢病毒pSin-RS1-GFP 12h后换液,48h后传代,稀释后接种到10cm皿,用浓度为1μg/ml的抗生素嘌呤霉素(Puromycin)筛选;
(4)10天后,在显微镜下挑选单克隆细胞,获得整合有RS1-GFP基因的单克隆HEK-293-RS1-GFP细胞系。
实施例5:pcDNA3.1-hLb2Cas12a-RVR在X连锁视网膜劈裂症致病基因的原位同源重组修复(a.Sanger测序检测结果 b.HDR修复比率 c.单克隆 Sanger测序检测结果);
(1)构建同源重组修复模板质粒pSin-EGFP-iires-puro-RS1,其包含不含启动子的GFP(绿色荧光蛋白)和Puro基因以及X连锁视网膜劈裂症致病基因RS1。其中,在RS1基因的3’端含有终止密码子;
(2)用胰蛋白酶消化对数生长期的HEK-293-RS1-GFP细胞计数后接种于12孔板,调整细胞密度为0.5×105个细胞/孔,37℃,5%CO2培养箱内培养;24h后将针对RS1致病基因DNA靶点的crRNA和Lb2Cas12a-RVR表达载体共转入HEK-293细胞中,轻轻摇晃混匀;放置在37℃,5%CO2培养箱内培养24h后更换新鲜培养基,48h后可观察到细胞RS1基因修复后恢复绿色荧光的细胞;第3天收集细胞,并抽提细胞基因组DNA,然后利用针对靶点的特异性引物进行PCR扩增,利用基因组DNA的PCR产物构建高通量测序DNA文库,并进行高通量测序。同时将基因组DNA的PCR产物通过T4连接酶(NEB)连接到pJET载体上,并进行转化,第二天挑取20个左右的单克隆,进行Sanger测序。
以上所述仅是本发明的优选实施方式,本发明的保护范围并不仅局限于上述实施例,凡属于本发明思路下的技术方案均属于本发明的保护范围。应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理前提下的若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
序列表
<110> 温州医科大学
<120> 一种新型基因组编辑工具(Lb2Cas12a-RVR)及其构建方法和应用方法
<130> 2019-7-10
<140> 2020100424061
<141> 2020-04-23
<160> 7
<170> SIPOSequenceListing 1.0
<210> 1
<211> 3756
<212> DNA
<213> 人工合成(Artificial Sequence)
<400> 1
atgtactatg agtccctgac caagcagtac cccgtgtcta agacaatccg gaatgagctg 60
atccctatcg gcaagacact ggataacatc cgccagaaca atatcctgga gagcgacgtg 120
aagcggaagc agaactacga gcacgtgaag ggcatcctgg atgagtatca caagcagctg 180
atcaacgagg ccctggacaa ttgcaccctg ccatccctga agatcgccgc cgagatctac 240
ctgaagaatc agaaggaggt gtctgacaga gaggatttca acaagacaca ggacctgctg 300
aggaaggagg tggtggagaa gctgaaggcc cacgagaact ttaccaagat cggcaagaag 360
gacatcctgg atctgctgga gaagctgcct tccatctctg aggacgatta caatgccctg 420
gagagcttcc gcaactttta cacctatttc acatcctaca acaaggtgcg ggagaatctg 480
tattctgata aggagaagag ctccacagtg gcctacagac tgatcaacga gaatttccca 540
aagtttctgg acaatgtgaa gagctatagg tttgtgaaaa ccgcaggcat cctggcagat 600
ggcctgggag aggaggagca ggactccctg ttcatcgtgg agacattcaa caagaccctg 660
acacaggacg gcatcgatac ctacaattct caagtgggca agatcaactc tagcatcaat 720
ctgtataacc agaagaatca gaaggccaat ggcttcagaa agatccccaa gatgaagatg 780
ctgtataagc agatcctgtc cgatagggag gagtctttca tcgacgagtt tcagagcgat 840
gaggtgctga tcgacaacgt ggagtcttat ggcagcgtgc tgatcgagtc tctgaagtcc 900
tctaaggtga gcgccttctt tgatgccctg agagagtcta agggcaagaa cgtgtacgtg 960
aagaatgacc tggccaagac agccatgagc aacatcgtgt tcgagaattg gaggaccttt 1020
gacgatctgc tgaaccagga gtacgacctg gccaacgaga acaagaagaa ggacgataag 1080
tatttcgaga agcgccagaa ggagctgaag aagaataaga gctactccct ggagcacctg 1140
tgcaacctgt ccgaggattc ttgtaacctg atcgagaatt atatccacca gatctccgac 1200
gatatcgaga atatcatcat caacaatgag acattcctgc gcatcgtgat caatgagcac 1260
gacaggtccc gcaagctggc caagaaccgg aaggccgtga aggccatcaa ggactttctg 1320
gattctatca aggtgctgga gcgggagctg aagctgatca acagctccgg ccaggagctg 1380
gagaaggatc tgatcgtgta ctctgcccac gaggagctgc tggtggagct gaagcaggtg 1440
gacagcctgt ataacatgac cagaaattat ctgacaaaga agcctttctc taccgagaag 1500
gtgaagctga actttaatcg cagcacactg ctgcgcggct gggatcggaa tgtggagaca 1560
gaccgcctgg gcgtgctgct gctgaaggac ggcaagtact atctgggcat catgaacaca 1620
agcgccaata aggccttcgt gaatccccct gtggccaaga ccgagaaggt gtttaagaag 1680
gtggattaca agctgctgcc agtgcccaac cagatgctgc caaaggtgtt ctttgccaag 1740
agcaatatcg acttctataa cccctctagc gagatctact ccaattataa gaagggcacc 1800
cacaagaagg gcaatatgtt ttccctggag gattgtcaca acctgatcga cttctttaag 1860
gagtctatca gcaagcacga ggactggagc aagttcggct ttaagttcag cgatacagcc 1920
tcctacaacg acatctccga gttctatcgc gaggtggaga agcagggcta caagctgacc 1980
tatacagaca tcgatgagac atacatcaat gatctgatcg agcggaacga gctgtacctg 2040
ttccagatct ataataagga ctttagcatg tactccaagg gcaagctgaa cctgcacaca 2100
ctgtatttca tgatgctgtt tgatcagcgc aatatcgacg acgtggtgta taagctgaac 2160
ggagaggcag aggtgttcta taggccagcc tccatctctg aggacgagct gatcatccac 2220
aaggccggcg aggagatcaa gaacaagaat cctaaccggg ccagaaccaa ggagacaagc 2280
accttcagct acgacatcgt gaaggataag cggtatagca aggataagtt taccctgcac 2340
atccccatca caatgaactt cggcgtggat gaggtgaagc ggttcaacga cgccgtgaac 2400
agcgccatcc ggatcgatga gaatgtgaac gtgatcggca tcgaccgggg cgagagaaat 2460
ctgctgtacg tggtggtcat cgactctaag ggcaacatcc tggagcagat ctccctgaac 2520
tctatcatca ataaggagta cgacatcgag acagattatc acgcactgct ggatgagagg 2580
gagggcggca gagataaggc ccggaaggac tggaacaccg tggagaatat cagggacctg 2640
aaggccggct acctgagcca ggtggtgaac gtggtggcca agctggtgct gaagtataat 2700
gccatcatct gcctggagga cctgaacttt ggcttcaaga ggggccgcca gaaggtggag 2760
aagcaggtgt accagaagtt cgagaagatg ctgatcgata agctgaatta cctggtcatc 2820
gacaagagcc gcgagcagac atcccctaag gagctgggag gcgccctgaa cgcactgcag 2880
ctgacctcta agttcaagag ctttaaggag ctgggcaagc agtccggcgt gatctactat 2940
gtgcctgcct acctgacctc taagatcgat ccaaccacag gcttcgccaa tctgttttat 3000
atgaagtgtg agaacgtgga gaagtccaag agattctttg acggctttga tttcatcagg 3060
ttcaacgccc tggagaacgt gttcgagttc ggctttgact accggagctt cacccagagg 3120
gcctgcggca tcaattccaa gtggaccgtg tgcaccaacg gcgagcgcat catcaagtat 3180
cggaatccag ataagaacaa tatgttcgac gagaaggtgg tggtggtgac cgatgagatg 3240
aagaacctgt ttgagcagta caagatcccc tatgaggatg gcagaaatgt gaaggacatg 3300
atcatcagca acgaggaggc cgagttctac cggagactgt ataggctgct gcagcagacc 3360
ctgcagatga gaaacagcac ctccgacggc acaagggatt acatcatctc ccctgtgaag 3420
aataagagag aggcctactt caacagcgag ctgtccgacg gctctgtgcc aaaggacgcc 3480
gatgccaacg gcgcctacaa tatcgccaga aagggcctgt gggtgctgga gcagatcagg 3540
cagaagagcg agggcgagaa gatcaatctg gccatgacca acgccgagtg gctggagtat 3600
gcccagacac acctgctgaa aaggccggcg gccacgaaaa aggccggcca ggcaaaaaag 3660
aaaaagggat cctacccata cgatgttcca gattacgctt atccctacga cgtgcctgat 3720
tatgcatacc catatgatgt ccccgactat gcctaa 3756
<210> 2
<211> 1569
<212> DNA
<213> 人工合成(Artificial Sequence)
<400> 2
atgtactatg agtccctgac caagcagtac cccgtgtcta agacaatccg gaatgagctg 60
atccctatcg gcaagacact ggataacatc cgccagaaca atatcctgga gagcgacgtg 120
aagcggaagc agaactacga gcacgtgaag ggcatcctgg atgagtatca caagcagctg 180
atcaacgagg ccctggacaa ttgcaccctg ccatccctga agatcgccgc cgagatctac 240
ctgaagaatc agaaggaggt gtctgacaga gaggatttca acaagacaca ggacctgctg 300
aggaaggagg tggtggagaa gctgaaggcc cacgagaact ttaccaagat cggcaagaag 360
gacatcctgg atctgctgga gaagctgcct tccatctctg aggacgatta caatgccctg 420
gagagcttcc gcaactttta cacctatttc acatcctaca acaaggtgcg ggagaatctg 480
tattctgata aggagaagag ctccacagtg gcctacagac tgatcaacga gaatttccca 540
aagtttctgg acaatgtgaa gagctatagg tttgtgaaaa ccgcaggcat cctggcagat 600
ggcctgggag aggaggagca ggactccctg ttcatcgtgg agacattcaa caagaccctg 660
acacaggacg gcatcgatac ctacaattct caagtgggca agatcaactc tagcatcaat 720
ctgtataacc agaagaatca gaaggccaat ggcttcagaa agatccccaa gatgaagatg 780
ctgtataagc agatcctgtc cgatagggag gagtctttca tcgacgagtt tcagagcgat 840
gaggtgctga tcgacaacgt ggagtcttat ggcagcgtgc tgatcgagtc tctgaagtcc 900
tctaaggtga gcgccttctt tgatgccctg agagagtcta agggcaagaa cgtgtacgtg 960
aagaatgacc tggccaagac agccatgagc aacatcgtgt tcgagaattg gaggaccttt 1020
gacgatctgc tgaaccagga gtacgacctg gccaacgaga acaagaagaa ggacgataag 1080
tatttcgaga agcgccagaa ggagctgaag aagaataaga gctactccct ggagcacctg 1140
tgcaacctgt ccgaggattc ttgtaacctg atcgagaatt atatccacca gatctccgac 1200
gatatcgaga atatcatcat caacaatgag acattcctgc gcatcgtgat caatgagcac 1260
gacaggtccc gcaagctggc caagaaccgg aaggccgtga aggccatcaa ggactttctg 1320
gattctatca aggtgctgga gcgggagctg aagctgatca acagctccgg ccaggagctg 1380
gagaaggatc tgatcgtgta ctctgcccac gaggagctgc tggtggagct gaagcaggtg 1440
gacagcctgt ataacatgac cagaaattat ctgacaaaga agcctttctc taccgagaag 1500
gtgaagctga actttaatcg cagcacactg ctgcgcggct gggatcggaa tgtggagaca 1560
gaccgcctg 1569
<210> 3
<211> 2187
<212> DNA
<213> 人工合成(Artificial Sequence)
<400> 3
ggcgtgctgc tgctgaagga cggcaagtac tatctgggca tcatgaacac aagcgccaat 60
aaggccttcg tgaatccccc tgtggccaag accgagaagg tgtttaagaa ggtggattac 120
aagctgctgc cagtgcccaa ccagatgctg ccaaaggtgt tctttgccaa gagcaatatc 180
gacttctata acccctctag cgagatctac tccaattata agaagggcac ccacaagaag 240
ggcaatatgt tttccctgga ggattgtcac aacctgatcg acttctttaa ggagtctatc 300
agcaagcacg aggactggag caagttcggc tttaagttca gcgatacagc ctcctacaac 360
gacatctccg agttctatcg cgaggtggag aagcagggct acaagctgac ctatacagac 420
atcgatgaga catacatcaa tgatctgatc gagcggaacg agctgtacct gttccagatc 480
tataataagg actttagcat gtactccaag ggcaagctga acctgcacac actgtatttc 540
atgatgctgt ttgatcagcg caatatcgac gacgtggtgt ataagctgaa cggagaggca 600
gaggtgttct ataggccagc ctccatctct gaggacgagc tgatcatcca caaggccggc 660
gaggagatca agaacaagaa tcctaaccgg gccagaacca aggagacaag caccttcagc 720
tacgacatcg tgaaggataa gcggtatagc aaggataagt ttaccctgca catccccatc 780
acaatgaact tcggcgtgga tgaggtgaag cggttcaacg acgccgtgaa cagcgccatc 840
cggatcgatg agaatgtgaa cgtgatcggc atcgaccggg gcgagagaaa tctgctgtac 900
gtggtggtca tcgactctaa gggcaacatc ctggagcaga tctccctgaa ctctatcatc 960
aataaggagt acgacatcga gacagattat cacgcactgc tggatgagag ggagggcggc 1020
agagataagg cccggaagga ctggaacacc gtggagaata tcagggacct gaaggccggc 1080
tacctgagcc aggtggtgaa cgtggtggcc aagctggtgc tgaagtataa tgccatcatc 1140
tgcctggagg acctgaactt tggcttcaag aggggccgcc agaaggtgga gaagcaggtg 1200
taccagaagt tcgagaagat gctgatcgat aagctgaatt acctggtcat cgacaagagc 1260
cgcgagcaga catcccctaa ggagctggga ggcgccctga acgcactgca gctgacctct 1320
aagttcaaga gctttaagga gctgggcaag cagtccggcg tgatctacta tgtgcctgcc 1380
tacctgacct ctaagatcga tccaaccaca ggcttcgcca atctgtttta tatgaagtgt 1440
gagaacgtgg agaagtccaa gagattcttt gacggctttg atttcatcag gttcaacgcc 1500
ctggagaacg tgttcgagtt cggctttgac taccggagct tcacccagag ggcctgcggc 1560
atcaattcca agtggaccgt gtgcaccaac ggcgagcgca tcatcaagta tcggaatcca 1620
gataagaaca atatgttcga cgagaaggtg gtggtggtga ccgatgagat gaagaacctg 1680
tttgagcagt acaagatccc ctatgaggat ggcagaaatg tgaaggacat gatcatcagc 1740
aacgaggagg ccgagttcta ccggagactg tataggctgc tgcagcagac cctgcagatg 1800
agaaacagca cctccgacgg cacaagggat tacatcatct cccctgtgaa gaataagaga 1860
gaggcctact tcaacagcga gctgtccgac ggctctgtgc caaaggacgc cgatgccaac 1920
ggcgcctaca atatcgccag aaagggcctg tgggtgctgg agcagatcag gcagaagagc 1980
gagggcgaga agatcaatct ggccatgacc aacgccgagt ggctggagta tgcccagaca 2040
cacctgctga aaaggccggc ggccacgaaa aaggccggcc aggcaaaaaa gaaaaaggga 2100
tcctacccat acgatgttcc agattacgct tatccctacg acgtgcctga ttatgcatac 2160
ccatatgatg tccccgacta tgcctaa 2187
<210> 4
<211> 717
<212> DNA
<213> 人工合成(Artificial Sequence)
<400> 4
ctgttcaccg gggtggtgcc catcctggtc gagctggacg gcgacgtaaa cggccacaag 60
ttcagcgtgt ccggcgaggg cgagggcgat gccacctacg gcaagctgac cctgaagttc 120
atctgcacca ccggcaagct gcccgtgccc tggcccaccc tcgtgaccac cctgacctac 180
ggcgtgcagt gcttcagccg ctaccccgac cacatgaagc agcacgactt cttcaagtcc 240
gccatgcccg aaggctacgt ccaggagcgc accatcttct tcaaggacga cggcaactac 300
aagacccgcg ccgaggtgaa gttcgagggc gacaccctgg tgaaccgcat cgagctgaag 360
ggcatcgact tcaaggagga cggcaacatc ctggggcaca agctggagta caactacaac 420
agccacaacg tctatatcat ggccgacaag cagaagaacg gcatcaaggt gaacttcaag 480
atccgccaca acatcgagga cggcagcgtg cagctcgccg accactacca gcagaacacc 540
cccatcggcg acggccccgt gctgctgccc gacaaccact acctgagcac ccagtccgcc 600
ctgagcaaag accccaacga gaagcgcgat cacatggtcc tgctggagtt cgtgaccgcc 660
gccgggatca ctctcggcat ggacgagctg tacaagtccg gactcagatc tcgataa 717
<210> 5
<211> 816
<212> DNA
<213> 人工合成(Artificial Sequence)
<400> 5
atgtctgctg gagctacctc cttagactgt attccagaat gcccttagca caagcccctg 60
ggtttcgagt caggggaggt cgtgagcaag ggcgaggagc tgttcaccgg ggtggtgccc 120
atcctggtcg agctggacgg cgacgtaaac ggccacaagt tcagcgtgtc cggcgagggc 180
gagggcgatg ccacctacgg caagctgacc ctgaagttca tctgcaccac cggcaagctg 240
cccgtgccct ggcccaccct cgtgaccacc ctgacctacg gcgtgcagtg cttcagccgc 300
taccccgacc acatgaagca gcacgacttc ttcaagtccg ccatgcccga aggctacgtc 360
caggagcgca ccatcttctt caaggacgac ggcaactaca agacccgcgc cgaggtgaag 420
ttcgagggcg acaccctggt gaaccgcatc gagctgaagg gcatcgactt caaggaggac 480
ggcaacatcc tggggcacaa gctggagtac aactacaaca gccacaacgt ctatatcatg 540
gccgacaagc agaagaacgg catcaaggtg aacttcaaga tccgccacaa catcgaggac 600
ggcagcgtgc agctcgccga ccactaccag cagaacaccc ccatcggcga cggccccgtg 660
ctgctgcccg acaaccacta cctgagcacc cagtccgccc tgagcaaaga ccccaacgag 720
aagcgcgatc acatggtcct gctggagttc gtgaccgccg ccgggatcac tctcggcatg 780
gacgagctgt acaagtccgg actcagatct cgataa 816
<210> 6
<211> 3812
<212> DNA
<213> 人工合成(Artificial Sequence)
<400> 6
caaaaaacct ggtcgagctg gacggcgacg atctacaata gtagaaattc ggtgcaaaaa 60
actgagcacc cagtccgccc tgagatctac aatagtagaa attcggtgca aaaaatgccc 120
atcctggtcg agctggacgg cgacgatcta caatagtaga aattcggtgc aaaaaaatcc 180
tggtcgagct ggacggcgac gatctacaat agtagaaatt cggtgcaaaa aatcctggtc 240
gagctggacg gcgacgatct acaatagtag aaattcggtg caaaaaactg gtcgagctgg 300
acggcgacga tctacaatag tagaaattcg gtgcaaaaaa tggtcgagct ggacggcgac 360
gatctacaat agtagaaatt cggtgcaaaa aaggtcgagc tggacggcga cgatctacaa 420
tagtagaaat tcggtgcaaa aaacgagctg gacggcgacg atctacaata gtagaaattc 480
ggtgcaaaaa agctggacgg cgacgatcta caatagtaga aattcggtgc aaaaaactcg 540
atgcggttca ccagggtgtc gccctcatct acaatagtag aaattcggtg caaaaaatgc 600
ggttcaccag ggtgtcgccc tcatctacaa tagtagaaat tcggtgcaaa aaacggttca 660
ccagggtgtc gccctcatct acaatagtag aaattcggtg caaaaaaggt tcaccagggt 720
gtcgccctca tctacaatag tagaaattcg gtgcaaaaaa gttcaccagg gtgtcgccct 780
catctacaat agtagaaatt cggtgcaaaa aattcaccag ggtgtcgccc tcatctacaa 840
tagtagaaat tcggtgcaaa aaaaccaggg tgtcgccctc atctacaata gtagaaattc 900
ggtgcaaaaa aagggtgtcg ccctcatcta caatagtaga aattcggtgc aaaaaacctg 960
gtcgagctgg acggcgacga tctacaatag tagaaattcc ggtgcaaaaa acggcatcaa 1020
ggtgaacttc aaatctacaa tagtagaaat tcggtgcaaa aaagtttacg tcgccgtcca 1080
gctcatctac aatagtagaa attcggtgca aaaaaggggt ggtgcccatc ctggtcatct 1140
acaatagtag aaattcggtg caaaaaacgg cgacgtaaac ggccacaaat ctacaatagt 1200
agaaattcgg tgcaaaaaag gtgaacagct cctcgccctt atctacaata gtagaaattc 1260
ggtgcaaaaa aggtggtgca gatgaacttc agatctacaa tagtagaaat tcggtgcaaa 1320
aaactacaac agccacaacg tctaatctac aatagtagaa attcggtgca aaaaagctgt 1380
tcaccggggt ggtgccatct acaatagtag aaattcggtg caaaaaactt gaagaagtcg 1440
tgctgcttat ctacaatagt agaaattcgg tgcaaaaaag ttcttctgct tgtcggccat 1500
atctacaata gtagaaattc ggtgcaaaaa agtcgccgtc cagctcgacc agatctacaa 1560
tagtagaaat tcggtgcaaa aaagacgttg tggctgttgt agttatctac aatagtagaa 1620
attcggtgca aaaaaggtgc ccatcctggt cgagctatct acaatagtag aaattcggtg 1680
caaaaaacgt ccagctcgac caggatggat ctacaatagt agaaattcgg tgcaaaaaag 1740
gtcgagctgg acggcgacgt atctacaata gtagaaattc ggtgcaaaaa acatcttctt 1800
caaggacgac ggatctacaa tagtagaaat tcggtgcaaa aaacaggatg ttgccgtcct 1860
ccttatctac aatagtagaa attcggtgca aaaaacgtcg ccgtccagct cgaccaatct 1920
acaatagtag aaattcggtg caaaaaacat gcccgaaggc tacgtccaat ctacaatagt 1980
agaaattcgg tgcaaaaaac ttgtggccgt ttacgtcgcc atctacaata gtagaaattc 2040
ggtgcaaaaa aggagctgtt caccggggtg gtatctacaa tagtagaaat tcggtgcaaa 2100
aaagagctgg acggcgacgt aaacatctac aatagtagaa attcggtgca aaaaagtgag 2160
caagggcgag gagctgatct acaatagtag aaattcggtg caaaaaactg ttcaccgggg 2220
tggtgcccat ctacaatagt agaaattcgg tgcaaaaaag ggcaccaccc cggtgaacag 2280
atctacaata gtagaaattc ggtgcaaaaa atcgaacttc acctcggcgc ggatctacaa 2340
tagtagaaat tcggtgcaaa aaagtggtgc agatgaactt caggatctac aatagtagaa 2400
attcggtgca aaaaaaccgg ggtggtgccc atcctgatct acaatagtag aaattcggtg 2460
caaaaaaggc gtgcagtgct tcagccgcat ctacaatagt agaaattcgg tgcaaaaaat 2520
tcgagggcga caccctggtg atctacaata gtagaaattc ggtgcaaaaa agaacagctc 2580
ctcgcccttg ctatctacaa tagtagaaat tcggtgcaaa aaaaggagct gttcaccggg 2640
gtggatctac aatagtagaa attcggtgca aaaaaaccta cggcgtgcag tgcttcatct 2700
acaatagtag aaattcggtg caaaaaagct tcatgtggtc ggggtagcat ctacaatagt 2760
agaaattcgg tgcaaaaaac cgtccagctc gaccaggatg atctacaata gtagaaattc 2820
ggtgcaaaaa acccatcctg gtcgagctgg acatctacaa tagtagaaat tcggtgcaaa 2880
aaagaggagc tgttcaccgg ggtgatctac aatagtagaa attcggtgca aaaaagcccg 2940
aaggctacgt ccaggaatct acaatagtag aaattcggtg caaaaaagcc gtccagctcg 3000
accaggatat ctacaatagt agaaattcgg tgcaaaaaat gctgcttcat gtggtcgggg 3060
atctacaata gtagaaattc ggtgcaaaaa agagggcgat gccacctacg gcatctacaa 3120
tagtagaaat tcggtgcaaa aaagtggccg tttacgtcgc cgtcatctac aatagtagaa 3180
attcggtgca aaaaacgcga tcacatggtc ctgctgatct acaatagtag aaattcggtg 3240
caaaaaagcc ctgagcaaag accccaacat ctacaatagt agaaattcgg tgcaaaaaat 3300
tcagcgtgtc cggcgagggc atctacaata gtagaaattc ggtgcaaaaa atcgccggac 3360
acgctgaact tgatctacaa tagtagaaat tcggtgcaaa aaacttcaag tccgccatgc 3420
ccgaatctac aatagtagaa attcggtgca aaaaagccca tcctggtcga gctggaatct 3480
acaatagtag aaattcggtg caaaaaaagg gcgaggagct gttcaccgat ctacaatagt 3540
agaaattcgg tgcaaaaaac tggagttcgt gaccgccgcc atctacaata gtagaaattc 3600
ggtgcaaaaa aaagggcgag gagctgttca ccatctacaa tagtagaaat tcggtgcaaa 3660
aaaaaattca ccgagcagga gtgaggatct acaatagtag aaattcggtg caaaaaactt 3720
gtgctaaggg cattctgatc tacaatagta gaaattcggt gcaaaaaact tgtgctaagg 3780
gcattctgat ctacaatagt agaaattcgg tg 3812
<210> 7
<211> 177
<212> DNA
<213> 人工合成(Artificial Sequence)
<400> 7
caacaagaca caggacctgc tgaggaagga ggtggtggag aagctggaac atcgtatggg 60
taggatccct ttttcttttt tgcctggctg ctgcgcggct gggatcggaa tgtggagaca 120
gaccgcctgg gcgcccaggc ggtctgtctc cacattccga tcccagccgc gcagcag 177
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