ReddRadar
Agent skill
bio-crispr-screens-base-editing-analysis
Analyzes base editing and prime editing outcomes including editing efficiency, bystander edits, and indel frequencies. Use when quantifying CRISPR base editor results, comparing ABE vs CBE efficiency, or assessing prime editing fidelity.
Stars
163
Forks
31
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/base-editing-analysis
SKILL.md
Base Editing Analysis
CRISPResso2 for Base Editing
bash
# Analyze base editing with expected outcome
CRISPResso --fastq_r1 reads.fq.gz \
--amplicon_seq ATGCGATCGATCGATCGATCGATCG \
--guide_seq TCGATCGATCGATCGAT \
--expected_hdr_amplicon_seq ATGCGATCGATCGTTCGATCGATCG \
--base_editor_output \
-o results/
Key Metrics
| Metric | Description |
|---|---|
| Editing efficiency | % reads with target base change |
| Bystander edits | Unintended edits in editing window |
| Indel frequency | Insertions/deletions (should be low) |
| Purity | Target edit without bystanders |
Base Editor Types
Cytosine Base Editors (CBE)
bash
# C->T conversion (or G->A on opposite strand)
CRISPResso --fastq_r1 reads.fq.gz \
--amplicon_seq $AMPLICON \
--guide_seq $GUIDE \
--base_editor_output \
--conversion_nuc_from C \
--conversion_nuc_to T
Adenine Base Editors (ABE)
bash
# A->G conversion (or T->C on opposite strand)
CRISPResso --fastq_r1 reads.fq.gz \
--amplicon_seq $AMPLICON \
--guide_seq $GUIDE \
--base_editor_output \
--conversion_nuc_from A \
--conversion_nuc_to G
Prime Editing Analysis
bash
# Prime editing with pegRNA
CRISPResso --fastq_r1 reads.fq.gz \
--amplicon_seq $AMPLICON \
--guide_seq $SPACER \
--expected_hdr_amplicon_seq $EDITED_AMPLICON \
--prime_editing_pegRNA_extension_seq $EXTENSION \
-o prime_edit_results/
Editing Window Analysis
python
import pandas as pd
# Load CRISPResso quantification
quant = pd.read_csv('CRISPResso_output/Quantification_window_nucleotide_percentage_table.txt',
sep='\t')
# Calculate per-position editing
editing_window = quant[(quant['Position'] >= -5) & (quant['Position'] <= 5)]
Quality Thresholds
- Editing efficiency: >30% considered good for most applications
- Indel rate: <5% ideal for base editors
- Bystander rate: depends on application; <10% often acceptable
Related Skills
- crispr-screens/crispresso-editing - General editing QC
- crispr-screens/library-design - Guide design considerations
- variant-calling/vcf-basics - Downstream variant analysis
Didn't find tool you were looking for?