新手入门「植物基因编辑全能工具CRISPRGE」

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2022.02.28

其他行业了解不多,在咱做水稻这块,无论正向还是反向都是离不开CRISPR/Cas9载体构建的。在做分子这块,大家都是构建载体的一把好手,但总会遇到些小问题,而这个网页所提供的方法可谓“一击必中”,从头到尾都安排得妥妥当当。

1)靶向序列准备或下载

从“seqDownload”下载基因序列(提供常见作物、模式动物及部分叶绿体和线粒体基因组作为参考),或从其他地方获取序列

2)靶位点设计

进入“targetDesign”设计靶序列

结果显示:

根据以下准则挑选最佳靶点(单或多):

“targetDesign”对有连续4个或以上T碱基(可能成为转录终止信号),较低(<30%)的GC含量,和靶序列与sgRNA序列有8碱基以上配对(产生RNA茎-环结构)的候选靶点判定为编辑效率可能较低的“坏”靶点而给出警示(!或!!)。

脱靶估值等于或大于0.7(或0.6)的靶点的脱靶突变的风险较高,尽可能不选用。一般选择GC含量45-70%,位置符合要求的靶点(正链和负链都可以),勾选后点击“primerDesign”跳转至“primerDesign-V”,可生成构建表达盒的引物。(参考《植物CRISPR/Cas9多基因编辑载体构建和突变分析的操作方法》DOI:10.1360/N052018-00069)

3)引物设计

载体构建原理:

4)构建转基因材料…

不同材料有所不同

5)测序结果解析

获得T0代后进行测序,查看突变位点,或T1、T2进行纯杂合鉴定

举个例子:

若检测不到靶点的突变信息,可能脱靶,可进行脱靶预测(或在进行材料构建前进行“预防”)

完美!

最后,前几天超市打折,华南农的校友们,冲了吗?!

参考文献:XieX,MaX,ZhuQ,ZengD,LiG,LiuYG.CRISPR-GE:AConvenientSoftwareToolkitforCRISPR-BasedGenomeEditing.MolPlant.2017Sep12;10(9):1246-1249.doi:10.1016/j.molp.2017.06.004.Epub2017Jun15.PMID:28624544.

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