Clinical Trial: Genetic Decryption of Leber Congenital Amaurosis (LCA) in a Large Cohort of Independent Families.

Study Status: Completed
Recruit Status: Completed
Study Type: Observational

Official Title: Genetic Decryption of Leber Congenital Amaurosis (LCA) in a Large Cohort of Independent Families: Establishment of Genotype-phenotype Correlations and Updating the Clinica

Brief Summary:

The main objectives of this study are:

  1. Improve genetic counseling by establishment of prevalences of each of genetic subtypes within a expanded population of patients with LCA taking into account ethnicity of families.
  2. Confirm, refine or modify the genotype-phenotype correlations.

  3. Edit important recommendations for:

    • The clinical and paraclinical exploration of a new patient based on genotype, especially for extraocular explorations, to book at certain genetic subtypes
    • Prenatal care of a couple.
    • Directing families to a therapeutic protocol in progress or in development.
  4. Individualize a panel of families without a mutation in the known genes and identify new genes responsible.

Detailed Summary:

This study characterize the clinical history of the disease (age and start mode of visual disturbances, rate and mode of progress of disease), careful assessment of retina function and finally, in search of the mutations responsible for this condition.

A full ophthalmic check-up, one at the inclusion and 24 months :

  1. - A genetic consultation taking account of family history and establishment of family tree with precision of geographical origin of birth of ascendants.

  2. - A thorough ophthalmologic examination by a referring medical ophthalmologist, including:

    2.1 - An interrogation on the development of the visual awakening since the birth and its possible disturbances.

    2.2 - The search for abnormal movements of the eyeballs, and difficulties with regard to different lighting.

    2.3 - Visual field evaluation Survey.

    2.4 - The study of color vision.

    2.5 - The search for a refractive disorder with the automatic refractometer.

    2.6 - Measurement of Visual acuity for near and distance.

    2.7 - Examination of the eyeball as a whole, examination of the anterior chamber of the eye by the slit lamp.

    2.8 - Taking pictures of the fundus of the eye after pupillary dilation.

    2.9 - An autofluorescence search using a Scanning Laser Ophthalmoscopy (SLO).

    Same as current

    Current Secondary Outcome:

    • Measurement of visual acuity using the logarithmic scale for children under 5 [ Time Frame: 24 MONTHS ]
    • Measurement of visual acuity using Early Treatment Diabetic Retinopathy Study scale (ETDRS) for far vision [ Time Frame: 24 MONTHS ]
    • The "Parinaud Scale" for near vision (After the age of 6) [ Time Frame: 24 MONTHS ]
    • Visual field evaluation Survey [ Time Frame: 24 MONTHS ]
    • Measurement of refraction by portable automatic refractometer. [ Time Frame: 24 MONTHS ]
    • Screening for color vision abnormalities using "children's boards" of "Ishihara Test" from the age of 3-4. [ Time Frame: 24 MONTHS ]
    • Screening for color vision abnormalities using "regular boards" as soon as learning to read figures from the age of five. [ Time Frame: 24 MONTHS ]
    • Test the color vision deficiency using the " Farnsworth test" in adults and children after the age of 6. [ Time Frame: 24 MONTHS ]
    • The visual field test using the Goldman dome in adults and children aged 6 to 7. [ Time Frame: 24 MONTHS ]
    • Electrophysiological examination using Electroretinogram. [ Time Frame: 24 MONTHS ]


    Original Secondary Outcome: Same as current

    Information By: Assistance Publique - Hôpitaux de Paris

    Dates:
    Date Received: November 17, 2016
    Date Started: September 2010
    Date Completion:
    Last Updated: November 18, 2016
    Last Verified: November 2016