In Silico Design and Evaluation of CRISPR Cytosine Base Editing Strategy for Potential Correction of the ASPA Variant Associated with Canavan Disease

A cytosine base editing guide for the ASPA c.691T>C (p.Tyr231His) variant was computationally prioritized, with a selected sgRNA showing favourable editing-window placement and genome-wide specificity.

• Why it matters: Canavan disease lacks effective molecularly targeted therapies, and the rare ASPA p.Tyr231His variant is potentially amenable to CBE, motivating rational guide design.
• What they did: Using an integrated in silico workflow, the study assessed conservation, pathogenicity, and protein stability (DynaMut2 DDG = -2.04 kcal/mol), then evaluated two sgRNAs for editing-window positioning, bystander editing, GC content (45%), and specificity (MIT: 82; CFD: 93) with CRISPRitz off-target scanning.
• The result: CRISPRitz found 108 potential off-target sites, none with fewer than three mismatches and only three exonic sites, supporting a framework for experimental testing of editing efficiency and purity.