EU/3/22/2746 - orphan designation for treatment of dopamine transporter deficiency syndrome

adeno-associated viral vector serotype 2 containing the human SLC6A3 gene

Overview

This medicine was designated as an orphan medicine for the treatment of dopamine transporter deficiency syndrome in the European Union on 13 January 2023.

This means that the developer will receive scientific and regulatory support from EMA to advance their medicine to the stage where they can apply for a marketing authorisation.

Orphan designation does not mean the medicine is available or authorised for use. All medicines, including designated orphan medicines, must be authorised before they can be marketed and made available to patients in the EU.

During the medicine's development, doctors may be able to enrol patients in clinical trials investigating the medicine. For information on ongoing clinical trials in the EU, see:

• EU Clinical Trials Register

• ClinicalTrials.gov

How the medicine is expected to work

Dopamine transporter deficiency syndrome is caused by mutations (changes) in the gene that produces the dopamine transporter protein. The medicine consists of a virus that contains a functional version of the gene. When given to the patient, it is expected that the virus will carry the gene into nerve cells, enabling them to produce the functional protein. This in turn is expected to enable the cells to transport dopamine, thus improving the symptoms of the condition.
The virus used in this medicine (adeno-associated viral vector) does not cause disease in humans.

Based on description provided by sponsor

Stage of development at time of orphan designation

At the time of submission of the application for orphan designation:

• The effects of the medicine had been evaluated in experimental models.
• No clinical trials with the medicine in patients with dopamine transporter deficiency syndrome had been started.

More information on how potential new medicines are tested during their development is available on Authorisation of medicines.

About orphan designation

Medicines intended for rare diseases can be granted an orphan designation during their development.

The orphan designation allows the developer to benefit from:

• scientific and regulatory support to advance their medicine to the stage where they can request marketing authorisation;

• market exclusivity once the medicine is on the market.

To qualify for orphan designation, a medicine must meet a number of criteria:

• it must be intended for the treatment, prevention or diagnosis of a disease that is life-threatening or chronically debilitating;

• the prevalence of the condition in the EU must not be more than 5 in 10,000 or it must be unlikely that marketing of the medicine would generate sufficient returns to justify the investment needed for its development;

• there are no satisfactory alternative methods for the diagnosis, prevention or treatment of the condition or, if such a method exists, the medicine is of significant benefit to those affected by the condition.

EMA's Committee for Orphan Medicinal Products (COMP) is responsible for issuing opinions on applications for orphan designations.

The Agency sends the COMP opinion to the European Commission, which is responsible for granting the orphan designation. The full list of orphan designations is available in the Community register of orphan medicinal products for human use.

For more information, see:

• Orphan designation: Overview

• Rare diseases, orphan medicines - Getting the facts straight

Minutes of the COMP meeting 6-8 December 2022

Adopted Reference Number: EMA/COMP/946245/2022

Key facts

• Active substance:
  adeno-associated viral vector serotype 2 containing the human SLC6A3 gene
• Intended use:
  Treatment of dopamine transporter deficiency syndrome
• Orphan designation status:
  Positive
• EU designation number:
  EU/3/22/2746
• Date of designation:
  13/01/2023
• Sponsor:

  FGK Representative Service GmbH