The definitive guide to gene editing.
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The map of the gene-editing revolution

CRISPR Decoded

Explore the technologies, treatments, diseases, scientists, companies, clinical trials and discoveries shaping the future of genetic medicine.

15 treatments tracked 14 clinical trials Educational reference · research only · never medical advice
You are in Guided View. Terms are explained as you go, and every page opens with a plain-language summary before the technical detail. Switch back to Expert View from the menu at any time.

Start where you actually are

This site is written for very different readers at once. Each door below leads into the same database from a different angle. Nothing is dumbed down, and nothing assumes a biology degree.

A child's hands holding a small glowing DNA ladder New to all of thisStart with what DNA is and build up. No background needed. A doctor and a patient talking across a desk A patient or familyWhat is approved, what is only in trials, and how to tell the difference. Nested glowing rectangles receding into darkness Following the industryWho is developing what, at which stage. Information, never advice. Rows of seedlings under purple grow lights Here for food and farmingGene-edited crops and livestock, and why the rules differ by country.

Explore gene editing

Seven ways scientists change genetic material. Each page opens with a plain-language explanation, then goes as deep as you want.

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the crystal structure of Streptococcus pyogenes Cas9 in complex with sgRNA and its target DNA at 2.5 A ˚ resolution CRISPR-Cas9A protein that can be programmed with a short RNA guide to find one specific sequence in a genome and cut it. Hiroshi Nishimasu, F. Ann Ran,... · CC BY-SA 3.0 A DNA helix with one letter being chemically changed Base EditingChemically converts one DNA letter into another at a chosen position, without cutting both strands of the double helix. A prime editor writing new letters into a DNA strand Prime EditingWrites a new stretch of DNA sequence directly into a chosen site, using a guide that carries the replacement text with it. A Cas12 enzyme on DNA, scattering fragments CRISPR-Cas12A family of CRISPR nucleases that cut DNA leaving staggered ends, use a different sequence requirement from Cas9, and can be smaller. A Cas13 enzyme cutting a strand of RNA CRISPR-Cas13Targets RNA rather than DNA, so it can silence a gene's message without touching the genome itself. A tiny Cas14 enzyme bound to a DNA helix Cas14 and miniature Cas systemsUnusually small CRISPR nucleases, roughly a third the size of Cas9, discovered in archaea and bacteriophages. An enzyme changing a letter on a strand of RNA RNA EditingChanges letters in the RNA message rather than in the DNA, so the effect is real but temporary and the genome is untouched. Two molecular structures side by side, linked by threads of light Compare them side by sidePrecision, cutting, cargo size, delivery, maturity, risks

Diseases being targeted

Each disease page states plainly whether gene editing is an approved treatment, in trials, or still only a laboratory idea.

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Blood smear from a patient with sickle cell anemia displaying sickle cells, polychromasia, and target cells Sickle Cell DiseaseBlood disorders SpicyMilkBoy · CC BY-SA 4.0 A giemsa stained blood smear from a person with beta thalassemia Beta ThalassemiaBlood disorders Dr Graham Beards · CC BY-SA 4.0 Fibrous amyloid deposits wrapped around heart muscle ATTR AmyloidosisMetabolic disease Swollen right hand in a female patient during a hereditary angioedema attack. Hereditary angioedema Hereditary AngioedemaRare genetic disease LucyHAE · CC BY-SA 3.0 A liver and an artery cross-section with lipoprotein particles High Cholesterol and Familial HypercholesterolemiaCardiovascular disease Micrograph of a nodular basal cell cancer with a cleft. H&E stain. Such clefts are caused by shrinkage of mucin during tissue fixation and staining. Robert S Bader. Which histologi CancerCancer Mikael Häggström, M.D. Author info... · CC0 Blood smear showing acute lymphatic leukaemia (Jenner's stain). Wellcome Images Keywords: Clinical Medicine; Goodall; Haematology; Guilland; Leukaemia Leukemia and LymphomaCancer https://wellcomeimages.org/indexplu... · CC BY 4.0 This scanning electron micrograph revealed the presence of the human immunodeficiency virus (HIV-1), (spherical in appearance), which had been co-cultivated with human lymphocytes. HIVInfectious disease Photo Credit: C. Goldsmith Content... · Public domain Histopathology of gastrocnemius muscle from patient who died of pseudohypertrophic muscular dystrophy, Duchenne type. Cross section of muscle shows extensive replacement of muscle Duchenne Muscular DystrophyMuscular disease Dr. Edwin P. Ewing, Jr. · Public domain A cross-section of an airway clogged with thick mucus Cystic FibrosisRare genetic disease

Treatments

Named medicines, with regulatory status stated on every record.

Casgevy (exagamglogene autotemcel)The first CRISPR-based medicine approved anywhere in the world: a one-time therapy made from a patient's own edited blood stem cells. Approved Lyfgenia (lovotibeglogene autotemcel)Approved on the same day as Casgevy for sickle cell disease, but a gene-addition therapy, not gene editing, which makes the pair a useful comparison. Approved Zynteglo (betibeglogene autotemcel)An approved gene-addition therapy for transfusion-dependent beta thalassemia: the non-editing alternative to Casgevy in the same disease. Approved Nexiguran ziclumeran (nex-z)The first CRISPR therapy ever administered into a human bloodstream: a single infusion intended to switch off the TTR gene in the liver for good. Phase III Lonvoguran ziclumeran (lonvo-z)The first in vivo gene-editing therapy to report a positive Phase 3 result: a single infusion intended to stop hereditary angioedema attacks permanently. Phase III Risto-cel (BEAM-101)A base-editing therapy for sickle cell disease that mimics a naturally protective genetic variant, with a licence application signalled for as early as the end of 2026. Phase III

Approved medicines in CRISPR Decoded: Casgevy (exagamglogene autotemcel) · Lyfgenia (lovotibeglogene autotemcel) · Zynteglo (betibeglogene autotemcel)

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Clinical trials

Where the evidence actually gets made.

4Recruiting
2Active, not recruiting
7Completed
CLIMB SCD-121: the trial that led to the first CRISPR medicine approvalSickle cell disease · NCT03745287 Phase II/III CLIMB THAL-111: the beta thalassemia trial behind the Casgevy approvalBeta thalassemia · NCT03655678 Phase II/III MAGNITUDE: Phase 3 in vivo CRISPR for ATTR cardiomyopathyATTR amyloidosis · NCT06128629 Phase III MAGNITUDE-2: Phase 3 in vivo CRISPR for ATTR polyneuropathyATTR amyloidosis · NCT06672237 Phase III HAELO: the first positive Phase 3 result for in vivo gene editingHereditary angioedema · NCT06634420 Phase III BEACON: base editing for sickle cell diseaseSickle cell disease · NCT05456880 Phase I/II

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Companies to know

Who is building what, and how far along each programme is.

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CRISPR TherapeuticsCRSP · Zug, Switzerland Intellia TherapeuticsNTLA · Cambridge, Massachusetts Beam TherapeuticsBEAM · Cambridge, Massachusetts Editas MedicineEDIT · Cambridge, Massachusetts Prime MedicinePRME · Cambridge, Massachusetts Verve TherapeuticsPrivate · Boston, Massachusetts Caribou BiosciencesCRBU · Berkeley, California Sana BiotechnologySANA · Seattle, Washington

Scientists who changed the field

What each person actually contributed. Attribution in this field is contested, and we say where.

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Jennifer Doudna in 2021 at the Innovative Genomics Institute by Christopher Michel Jennifer DoudnaStructural biochemist who, with Emmanuelle Charpentier, showed that Cas9 could be programmed with a single guide RNA to cut chosen DNA, and shared the 2020 Nobel Prize in Chemistry for it. Christopher Michel · CC BY-SA 4.0 Director, Max Planck Institute for Infection Biology, Department of Regulation in Infection Biology. Visiting professor The Laboratory for Molecular Infection Medicine Sweden MIMS; Emmanuelle CharpentierMicrobiologist who discovered tracrRNA, the missing component of the CRISPR-Cas9 system, and shared the 2020 Nobel Prize in Chemistry with Jennifer Doudna. Bianca Fioretti, Hallbauer & Fioretti · CC BY-SA 4.0 Prof. Feng Zhang at the Forbes 30 Under 30 Summit, Boston MA. 2017 Feng ZhangBioengineer who led one of the first demonstrations of CRISPR genome editing in human cells and discovered several new CRISPR systems including Cas12a and Cas13. PuppyEggs · CC BY-SA 4.0 David R. Liu, chemist, 2012 photo David LiuChemical biologist whose laboratory invented base editing and prime editing, the two techniques that changed gene editing from cutting to writing. ServiceAT · CC BY-SA 4.0 George Church in 2023 George ChurchGeneticist whose laboratory independently demonstrated CRISPR editing in human cells in 2013, and a founder of an unusually large number of genomics companies. Christopher Michel · CC BY-SA 4.0 Prof. Virginijus Šikšnys Virginijus ŠikšnysLithuanian biochemist who independently showed that Cas9 could be programmed to cut DNA, publishing in 2012, and whose contribution is often omitted from popular accounts. Gie2016 · CC BY-SA 4.0

Latest gene-editing news

Real articles from named publishers. Every headline links to the original. We never rewrite or republish them.

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STAT+: After two deaths in autoimmune cell therapy trial, Artiva is shutting down Recent deaths are setbacks in drug companies’ interest in applying cancer therapy strategies to autoimmune diseases. STAT Treatments 2h ago↗ Bonjour Genomics: A Video from ASHG GEN editors Uduak Thomas and Julianna LeMieux, PhD, recap ASHG, highlighting key sessions, Ultima Genomics’ user group meeting, Illumina news, and… GEN — Genetic Engineering News Companies 3h ago↗ Artiva to wind down after two patient deaths in autoimmune cell therapy trials Cell therapy biotech Artiva Biotherapeutics abruptly announced Tuesday morning that it is effectively shutting down and laying off almost all of its staff… Endpoints News Clinical Trials 5h ago↗ Outpace ends an ovarian cancer trial; Incyte data impresses at ESMO Plus news about Genmab, Rumi, Prana and Fractyl. Outpace Bio ends cell therapy trial: The Seattle startup canned a Phase 1 ovarian cancer trial of its… Endpoints News Clinical Trials 5h ago↗ STAT+: Nonprofit resurrects shelved gene therapy after startup shuts down Last year, U.K. gene therapy startup Bloomsbury Genetic Therapies announced it was shutting down after dosing just one patient. Now, a nonprofit is… STAT Treatments 6h ago↗ Spatial Proteomics for Precision Oncology In this GEN webinar, Bernd Bodenmiller, PhD (University of Zürich), illustrates this integrated approach through two recent examples. The post Spatial… GEN — Genetic Engineering News Companies 1d ago↗ STAT+: Pharmalittle: We’re reading about a Roche lung cancer drug, a Bristol CAR-T trial death, and more Bristol Myers Squibb reported that one patient died after receiving its investigational CAR-T therapy in an early autoimmune trial STAT Treatments 1d ago↗ Author Correction: In vivo mitochondrial base editing restores genotype and visual function in a mouse model of LHON Nature Genetics Research 1d ago↗

CRISPR explained

Start at the very beginning. No biology background needed.

Start learning →
What is DNA?DNA is a long chemical chain that stores the instructions for building and running a living… What is a gene?A gene is a stretch of DNA that carries the instructions for making one particular thing the… What is a chromosome?A chromosome is one very long DNA molecule packaged with proteins; humans normally have 46, in… What is a genome?A genome is the complete set of genetic instructions in an organism: every chromosome, every… What is RNA?RNA is DNA's working copy: a temporary, single-stranded version the cell makes when it needs to… What is a mutation?A mutation is a change in DNA sequence. Most do nothing, some cause disease, and a few are…
An open journal, a magnifying glass and a molecular model under a desk lamp The research behind it Landmark papers summarised in plain language, each linked to the original publication. A vintage microscope and a chain of glowing milestones The history of gene editing From the structure of DNA to the first approved CRISPR medicine: the events that got us here.
A farmhouse on a ploughed field at sunset AgricultureCrops, livestock and the rules that differ by country Two empty chairs facing each other with a balance scale above EthicsThe arguments, presented from both sides A city skyline through a window with a glowing chart overlay InvestingHow this industry is financed: information, not advice The Earth at night with glowing connection lines World mapWhere gene editing happens
Before you read further CRISPR Decoded is an educational reference. It does not provide medical advice, and information about an experimental therapy is never evidence that the therapy is safe or effective. Clinical-trial and regulatory status change frequently. If a decision about your own health or a family member's is involved, speak to a qualified healthcare professional. Read the full disclaimers →