Synergistic HMGN1 and VP64 Fusions Potentiate High-Precision and PAM-Flexible Base Editing.
Luo X, Qu Y, Ye Z, Li Z, Zhang Y
Crispr
Rice breeders working to develop drought-tolerant or disease-resistant varieties just gained a tool that can rewrite nearly any spot in a plant's genome with far greater precision — which could shorten the breeding timeline for crops feeding billions of people.
CRISPR gene editing usually requires the target DNA to have a specific 'landing pad' sequence nearby, which limits where edits can be made. This research combined a more flexible version of the CRISPR tool — one that can land almost anywhere — with helper proteins that make the editing much more effective. The result was tested in rice and worked well, opening the door to more precise crop improvements with fewer unintended changes.
Key Findings
Combining a near-PAM-less Cas9 variant (SpRY) with truncated CDA1 deaminases enabled precise cytosine base editing at virtually any genomic position.
Fusing HMGN1 and VP64 proteins to the editor substantially boosted editing efficiency without increasing off-target effects.
The enhanced base editor demonstrated robust performance in both yeast and rice, confirming applicability across eukaryotic organisms.
chevron_right Technical Summary
Scientists developed a more flexible and precise gene-editing tool for plants by combining a nearly unrestricted CRISPR variant with proteins that boost its efficiency, successfully testing it in rice.
Abstract Preview
RNA-guided CRISPR-derived base editors (BEs) have revolutionized genome editing by enabling targeted base substitutions. However, their application is frequently constrained by the stringent requir...
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