Targeted isolation and cloning of 100-kb microbial genomic sequences by Cas9-assisted targeting of chromosome segments.
Cloning of long microbial genomic sequences is an essential tool in synthetic biology and genome engineering. Such long sequences are often difficult to obtain directly by traditional PCR or restriction enzyme digestion, and therefore the cloning of these sequences has remained a technical obstacle in molecular biology. Based on the in vitro application of RNA-guided Cas9 nuclease, the method of Cas9-assisted targeting of chromosome segments (CATCH) cleaves target DNA in vitro from intact bacterial chromosomes embedded in agarose plugs, which can be subsequently ligated with cloning vector through Gibson assembly. Here we describe an optimized protocol of CATCH cloning for the targeted cloning of long genomic sequences of up to 100 kb from microorganisms. The protocol uses standard laboratory equipment and takes ∼8 h of bench time over several days, and it may potentially simplify and accelerate efforts to isolate and clone large gene clusters from microorganisms.
School of Life Sciences, Center for Synthetic and Systems Biology, Ministry of Education Key Laboratory of Bioinformatics, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Tsinghua University, Beijing, China.
Wenjun
W
Jiang
School of Life Sciences, Center for Synthetic and Systems Biology, Ministry of Education Key Laboratory of Bioinformatics, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Tsinghua University, Beijing, China.
Ting F
TF
Zhu
D001426:Bacterial Proteins / Q000235:genetics; D000076987:CRISPR-Associated Protein 9; D002876:Chromosomes, Bacterial; D003001:Cloning, Molecular / Q000379:methods*; D004720:Endonucleases / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005822:Genetic Vectors; D016680:Genome, Bacterial / Q000235:genetics*; D023281:Genomics / Q000379:methods; D058615:Synthetic Biology / Q000379:methods; D057188:Workflow; D000094704:RNA, Guide, CRISPR-Cas Systems
D001426:Bacterial Proteins; D000076987:CRISPR-Associated Protein 9; D004720:Endonucleases; D000094704:RNA, Guide, CRISPR-Cas Systems; C000606107:Cas9 endonuclease Streptococcus pyogenes