Abstract
AbstractMethanogenic archaea play an important role in the global carbon cycle and are regarded as promising host organisms for the biotechnological generation of fuels and chemicals from one-carbon substrates.Methanosarcina acetivoransis extensively studied as a model methanogen due to the availability of genetic tools and its versatile substrate range. Although genome editing inM. acetivoransvia CRISPR/Cas9 has already been demonstrated, we now describe a user-friendly CRISPR/Cas12a toolbox that recognizes a T-rich (5′-TTTV) PAM sequence. This new system can manage deletions of 3500 bp (i.e., knockout of the entirefrhADGBoperon) and heterologous gene insertions with 80% efficiency observed in ten PurRtransformants. Our CRISPR/Cas12a system also enables multiplex genome editing at high efficiency, which helps speed up genetic engineering. Deletions of 100 bp generated on two separate sites of the genome yielded 8/8 correctly edited transformants. Simultaneous gene deletion (100 bp) and replacement (100-bp region replaced by the 2400-bpuidAexpression cassette) at a separate site was achieved, with 3/6 of transformants being edited correctly. In combination with the Cas9-based system, our CRISPR/Cas12a toolbox enables targeted genome editing at two sites (guanine-rich and thymine-rich, respectively) and, in so doing, hastens the overall genetic engineering of theMethanosarcinalesspecies.
Publisher
Cold Spring Harbor Laboratory
Cited by
1 articles.
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