Repairing a faulty gene

Healthy

DNA

inserted

3

The DNA is allowed to repair naturally, or a 'healthy' section of DNA can be inserted

2

The RNA aligns with the faulty DNA and the CAS9 attaches and cuts the DNA double helix

DNA is cut

1

An RNA molecule, mixed with an enzyme called CAS9, is programmed to match a faulty section of DNA

RNA

Faulty DNA section

Cas9

Cas9

Healthy

DNA

inserted

3

The DNA is allowed to repair naturally, or a 'healthy' section of DNA can be inserted

2

The RNA aligns with the faulty DNA and the CAS9 attaches and cuts the DNA double helix

DNA is cut

1

An RNA molecule, mixed with an enzyme called CAS9, is programmed to match a faulty section of DNA

Faulty section

DNA

RNA

Cas9

Cas9

3

The DNA is allowed to repair naturally, or a 'healthy' section of DNA can be inserted

Healthy

DNA

inserted

2

The RNA aligns with the faulty DNA and the CAS9 cuts the DNA double helix at both ends

DNA is cut

1

An RNA molecule, attached to an enzyme called CAS9, is programmed to match a faulty section of DNA

Faulty section

DNA

RNA

Cas9

Cas9