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Markerless genome editing in Clostridium beijerinckii using the CRISPR-Cpf1 system.

A new interesting article has been published in J Biotechnol. 2018 Oct 20;284:27-30. doi: 10.1016/j.jbiotec.2018.07.040. Epub 2018 Aug 4. and titled:

Markerless genome editing in Clostridium beijerinckii using the CRISPR-Cpf1 system.

Authors of this article are:

Zhang J, Hong W, Zong W, Wang P, Wang Y.

A summary of the article is shown below:

CRISPR-Cpf1 is a type V CRISPR system that has recently been exploited for genome engineering purposes. Compared to the well-known Streptococcus pyogenes CRISPR-Cas9 system, the effector protein Cpf1 recognizes T-rich protospacer-adjacent motif (PAM) instead of G-rich PAM (used by CRISPR-Cas9), which could offer a substantial expansion of the existing genetic toolbox for genome editing. In this study, we report the implementation of the Acidaminococcus sp. Cpf1 (AsCpf1) for markerless genome engineering in Clostridium beijerinckii, a prominent species for biosolvent production through the well-known Acetone-Butanol-Ethanol (ABE) pathway. A lactose inducible promoter was used to control the expression of AsCpf1 to decrease its toxicity, while a constitutive small RNA promoter was employed to drive the expression of pre-crRNA. A One-Step-Assembly (OSA) approach was employed to construct the CRISPR-Cpf1-based vector in one single step, which simplified and streamlined the plasmid construction process. Using the customized CRISPR-Cpf1 system, we successfully deleted spo0A and pta genes in C. beijerinckii, with an editing efficiency of up to 100%. Altogether, our results demonstrated the easy programmability and high efficiency of the CRISPR-Cpf1 system for versatile genome engineering purposes. This study provides valuable guidance and essential references for repurposing the CRISPR-Cpf1 system for genome engineering in other microorganisms.

Check out the article’s website on Pubmed for more information:

This article is a good source of information and a good way to become familiar with topics such as:

Butanol;CRISPR-Cpf1;Clostridium beijerinckii;Genome editing;Homologous recombination


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