Targeted genome modifications in soybean with CRISPR/Cas9

TLDR

CRISPR/Cas9 enables precise genome editing in diverse organisms, offering a powerful tool for basic and applied research. The study aims to develop vectors and methods that facilitate CRISPR/Cas9 application in soybean and other plant species. The authors developed a novel In‑Fusion®‑based cloning strategy and vector system that simplifies production of CRISPR/Cas9 targeting vectors for any gene in any organism, demonstrating the tool’s simplicity, efficiency, and specificity in soybean. CRISPR/Cas9 effectively edited soybean, achieving a 95 % mutation rate in hairy‑root events, bi‑allelic mutations in eight of nine loci, common small deletions, successful targeting of homoeologous genes, and increased mutation frequency in somatic embryo cultures over time, with some vectors more efficient than others.

Abstract

The ability to selectively alter genomic DNA sequences in vivo is a powerful tool for basic and applied research. The CRISPR/Cas9 system precisely mutates DNA sequences in a number of organisms. Here, the CRISPR/Cas9 system is shown to be effective in soybean by knocking-out a green fluorescent protein (GFP) transgene and modifying nine endogenous loci.Targeted DNA mutations were detected in 95% of 88 hairy-root transgenic events analyzed. Bi-allelic mutations were detected in events transformed with eight of the nine targeting vectors. Small deletions were the most common type of mutation produced, although SNPs and short insertions were also observed. Homoeologous genes were successfully targeted singly and together, demonstrating that CRISPR/Cas9 can both selectively, and generally, target members of gene families. Somatic embryo cultures were also modified to enable the production of plants with heritable mutations, with the frequency of DNA modifications increasing with culture time. A novel cloning strategy and vector system based on In-Fusion® cloning was developed to simplify the production of CRISPR/Cas9 targeting vectors, which should be applicable for targeting any gene in any organism.The CRISPR/Cas9 is a simple, efficient, and highly specific genome editing tool in soybean. Although some vectors are more efficient than others, it is possible to edit duplicated genes relatively easily. The vectors and methods developed here will be useful for the application of CRISPR/Cas9 to soybean and other plant species.