醇溶蛋白
基因
基因组编辑
生物
清脆的
面筋
基因组
Cas9
贮藏蛋白
遗传学
食品科学
作者
Zitong Yu,Ural Yunusbaev,Allan K. Fritz,Michael Tilley,Alina Akhunova,Harold N. Trick,Eduard Akhunov
标识
DOI:10.1101/2023.01.30.526376
摘要
ABSTRACT Wheat immunotoxicity is associated with abnormal reaction to gluten-derived peptides. Attempts to reduce immunotoxicity using breeding and biotechnology often affect dough quality. Here, the multiplexed CRISPR-Cas9 editing of cultivar Fielder was used to modify the ω -and γ-gliadin gene clusters abundant in immunoreactive peptides identified in the genomes assembled using the long-read sequencing technologies. The whole genome sequencing of an edited line showed editing or deletion of nearly all ω-gliadin and half of the γ-gliadin gene copies and lack of editing in the α/β-gliadin genes. The detected 62% and 52% reduction in ω- and γ-gliadin content, respectively, had no negative impact on grain protein quality. A 47-fold immunoreactivity reduction compared to wild-type was detected using antibodies against immunotoxic peptides. Our results indicate that genome profiling to identify gliadin gene copies abundant in immunoreactive peptides and their targeted editing could be an effective mean for reducing immunotoxicity of wheat cultivars while minimizing the impact of editing on protein quality.
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