Crispr/cas9-mediated mutation of starch branching enzyme iib in rice for enhanced nutritional profile

Overview

This research leverages CRISPR/Cas9 genome editing technology to create targeted mutations in the starch branching enzyme IIb (OsSBEIIb) gene in rice. Starch branching enzyme is the sole enzyme responsible for introducing alpha(1→6) glycosidic bonds that drive amylopectin formation. By knocking out SBEIIb activity, the technology aims to shift starch composition toward higher amylose content, producing rice with reduced glycemic impact and improved nutritional value. The work addresses a key limitation of conventional rice, which has relatively high glycemic content compared to other starchy foods.

Technical specifications

Key features:

• A single guide RNA (sgRNA) designed to target the third exon of the OsSBEIIb gene for precise CRISPR/Cas9 editing
• Agrobacterium-mediated transformation using immature embryos of rice cultivar CO 51 as explants
• PCR-based confirmation of putative transgenic lines through detection of cas9 and hpt marker genes
• Sanger sequencing of a 312 bp amplified segment of OsSBEIIb for mutant identification in the T0 generation
• Planned molecular and biochemical characterization of edited mutants
• Planned in silico analysis including molecular docking, virtual screening, and protein-protein interaction studies

Technology readiness level

The technology is currently at an early-to-mid stage of development. The CRISPR construct design and Agrobacterium-mediated transformation protocols have been established, and putative transgenic CO 51 lines have been generated and are undergoing molecular characterization. Future validation steps include sequencing-based mutant confirmation, comprehensive molecular and biochemical profiling of edited rice lines, and computational analysis of protein interactions. The platform is positioned for further characterization before advancing toward field evaluation and potential commercial development.