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✂️ Molecular Biology · Method

CRISPR Genome Editing

Targeted gene knockout/knockin
🎯 Difficulty ★★★ Advanced Duration About 2–4 weeks 🎯 Use Generate gene knockout/knockin cell lines or models to study gene function
📖 Principle
sgRNA guides Cas9 to cut target DNA; NHEJ or HDR repair yields knockout or knockin
Below are 4 steps. Open each to see how to do it and add products to your shared list.

📋 Workflow

Full workflow, products add-to-cart directly
1

sgRNA design and construction

1 day
Design sgRNA with online tools, assess off-targets, clone into Cas9 expression vector
💡 Tip Choose high-specificity low off-target guides
⚠️ Caution Avoid targeting non-specific homology regions
🧪 Materials for this step (click to shop by spec/brand)
2

Delivery/transfection

1 day
Transfect cells (lipid/electroporation/nucleofection) or use RNP complex for higher efficiency
💡 Tip RNP reduces off-target effects
⚠️ Caution Passage cells to recover from stress
🧪 Materials for this step (click to shop by spec/brand)
3

Screen positive clones

1–2 weeks
Fluorescence sort or limiting dilution, pick and expand single clones
💡 Tip Single-cell cloning avoids mixed populations
⚠️ Caution Subclone verification for homozygous deletion
🧪 Materials for this step (click to shop by spec/brand)
4

Verify editing

1–2 weeks
Confirm genotype by sequencing, verify knockout by western blot of protein
💡 Tip Cross-validate with multiple methods
⚠️ Caution Confirm both DNA and protein levels
🧪 Materials for this step (click to shop by spec/brand)

⚠️ 5 Common Beginner Mistakes

  • Off-target sgRNA causes non-specific editing
  • Low delivery efficiency yields few positives
  • No single-cloning causes mixed editing
  • Unverified homozygous knockout confounds interpretation
  • Incomplete verification leaves protein expressed

❓ FAQ

+How to reduce off-target effects?
Choose specific guides, high-fidelity Cas9, or RNP delivery with short action.
+Incomplete knockout?
Use multiple guides, purify single clones, optimize with PAM/NHEJ.
+Can point-mutation knockin be done?
Yes, using an HDR donor template with homology arms.

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Data authenticity: Product categories from JW Supply Chain standard taxonomy; method→step→product connected. Last updated: 2026-08-23 · v3.0