Life sciences · Reference
What is gene editing?
Gene editing is a group of technologies that let researchers change an organism’s DNA at precise locations — adding, removing, or altering sequence — to study or modify how genes work.
How gene editing works
Most gene-editing tools work by creating a precise break in the DNA at a target location. The cell then repairs the break, and researchers exploit this repair: error-prone repair can disable a gene, while supplying a template can introduce a specific change or insert new sequence. The defining feature of modern gene editing is precision — the ability to act on a chosen sequence rather than making random changes across the genome.
CRISPR, TALENs and zinc-finger nucleases
Several systems can target DNA. Zinc-finger nucleases (ZFNs) and TALENs (transcription activator-like effector nucleases) use engineered proteins to recognise specific sequences, but each new target requires designing a new protein.
CRISPR-Cas9, introduced as an editing tool in 2012, instead uses a short guide RNA that is simple and cheap to redesign for new targets. Its flexibility made gene editing far more accessible and accelerated research across biology.
Somatic versus germline editing
A key distinction is which cells are edited. Somatic editing changes non-reproductive cells, so the edit affects only the treated individual and is not inherited. Germline editing changes reproductive cells or early embryos, meaning the change could be passed to future generations. Germline editing raises significant ethical and safety questions and is tightly restricted or prohibited in many jurisdictions.
Research framing and responsible use
Gene editing is widely used in basic research, agriculture, and biotechnology to study gene function and develop new strains and tools. Its power has prompted extensive discussion of ethics, governance, and oversight by scientific and regulatory bodies. This page explains the science and research context of gene editing and is not medical advice.
Key facts
At a glance
- Also called: genome editing
- Main tools: CRISPR-Cas9, TALENs, zinc-finger nucleases
- Mechanism: targeted DNA cut plus cellular repair
- Somatic edits: affect only the treated individual
- Germline edits: potentially heritable, heavily restricted
- CRISPR as editing tool: introduced 2012
Common questions
FAQ
What is the difference between gene editing and genetic engineering?+
Genetic engineering is the broad practice of deliberately modifying an organism’s genome, historically including inserting genes from other species. Gene editing is a more recent, precise subset that targets specific sequences within the existing genome to add, remove, or change them.
What is the difference between somatic and germline editing?+
Somatic editing changes non-reproductive cells and is not passed to offspring. Germline editing changes reproductive cells or embryos and could be inherited, which is why it is subject to strong ethical and legal restrictions.
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