RETT: New Genes Involved in Molecular Etiology of Rett Syndrome Through DNA Microarray Comparative Genomic Hybridization
Study Details
Study Description
Brief Summary
Rett syndrome (RTT) is a genetic encephalopathy and the typical form is caused by mutations in the gene MECP2. It is a genetically heterogeneous pathology. CDKL5 and FOXG1 have been recently discovered being involved in other forms of RTT. However, at least 5% of typical forms and more other atypical forms are not linked to any of 3 genes known to be involved in the disease.
The purpose of this study is to identify new genes involved in molecular etiology of typical and atypical forms of RTT.
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
|
N/A |
Detailed Description
Search for pathogenic chromosomal imbalance through comparative genomic hybridization (aCGH) on DNA microarrays will be done in a group of patients having typical or atypical forms of RTT without known mutations in MECP2, CDKL5 et FOXG1B genes.
After imbalance confirmation by qPCR, the pathogenic potential of the segmental aneusomy will be assigned according to the interpretation of aCGH technique-dedicated DECEPHER, BACH and GVD databases. Analysis of parents will allow distinguishing between inherited polymorphic variants and potentially deleterious new imbalances.
In case of a new imbalance, a bioinformatics approach will look for candidate genes that will be possibly confirmed by classic mutation screening (sequencing and PCR) in all typical and atypical cases of RTT present in the cohort.
The identification of new genes involved in RTT will ameliorate the molecular diagnosis of the disease and genetic counseling for families. This project will allow progression in comprehension of physiopathological mechanisms of cerebral development abnormalities
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| Experimental: RTT patient Blood sampling |
Procedure: Blood sampling
In children: 2 EDTA tubes of 7 ml, 1 Heparin Li tube of 5 ml and 2 PAXgene tubes of 2.5 ml (max 0.8-0.9 ml blood/kg) In parents: 2 EDTA tubes of 7 ml, 1 Heparin Li tube of 5 ml.
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| Experimental: Parents Blood sampling. To distinguish between inherited polymorphic variants and potentially deleterious new imbalances. |
Procedure: Blood sampling
In children: 2 EDTA tubes of 7 ml, 1 Heparin Li tube of 5 ml and 2 PAXgene tubes of 2.5 ml (max 0.8-0.9 ml blood/kg) In parents: 2 EDTA tubes of 7 ml, 1 Heparin Li tube of 5 ml.
|
Outcome Measures
Primary Outcome Measures
- Analysis of chromosomal imbalances through comparative genomic hybridization on DNA microarrays [up to 12 months]
Search for pathogenic chromosomal imbalance
Eligibility Criteria
Criteria
Inclusion Criteria:
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Patients: RETT syndrome
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Patients: Female
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Parents: parent of a patients
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | Handicaps de l'Enfant - Pavillon Ste Marie, CHU St Jacques | Besançon | France | ||
| 2 | Service de Neuropédiatrie, Hôpital St Jacques, CHU de Besançon | Besançon | France | ||
| 3 | Unité de génétique, Groupe hospitalier Hôpital Flaubert | Caen | France | ||
| 4 | Centre de Génétique Hôpital d'Enfants, CHU de Dijon | Dijon | France | ||
| 5 | Service de neuropédiatrie, CHU Hôpital Gui de Chauliac | Montpellier | France | ||
| 6 | Laboratoire de Génétique chromosomique, CHU Hôpital l'Archet 2 | Nice | France | ||
| 7 | Service de génétique médicale, CHU Hôpital Purpan | Nice | France | ||
| 8 | Service de génétique médicale, CHU Hôpital Purpan, CHU de Toulouse | Toulouse | France | ||
| 9 | Laboratoire de Génétique, Hôpitaux de Brabois, CHU de Nancy | Vandoeuvre les Nancy | France |
Sponsors and Collaborators
- Central Hospital, Nancy, France
Investigators
- Principal Investigator: Christophe PHILIPPE,, Laboratoire de Génétique Médicale, Rue du Morvan, 54511 Vandoeuvre-Les-Nancy Cédex
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- 2009-A01147-50