CROP

CROP predicts and quantifies potential CRISPR/Cas9 guide RNA (gRNA) off-target sites to inform selection of gRNAs with minimized off-target effects.

Key Features:

• Variant Generation: Generates all possible substitution, deletion, and insertion variants of each gRNA sequence.
• Genome Mapping: Aligns each variant against a reference genome to identify potential off-target loci.
• Scoring and Alignment: Evaluates alignments using a scoring system that quantifies the likelihood of off-target cleavage for each gRNA.
• Reporting: Compiles results into a detailed table presenting off-target propensity scores for gRNAs derived from the input sequence.

Scientific Applications:

• Functional Genomics: Enables selection of gRNAs with reduced off-target risk to increase confidence in gene-function studies.
• Therapeutic Development: Supports safety assessment in CRISPR-based therapeutic development by identifying potential off-target activity.
• Basic Research: Refines experimental design by allowing selection of high-specificity gRNAs to reduce experimental noise from off-target effects.

Methodology:

Generates substitution, deletion, and insertion gRNA variants, aligns each variant to a reference genome, scores alignments for off-target likelihood, and compiles results into a summary table.