Phenotypic and Genotypic Identification and Characterization of MYH9-related Constitutional Thrombocytopenia (MAGIC-MYH9)
The research involves the establishment of a cohort including as much as possible cases of macrothrombocytopenia related to a "MYH9 syndrome" and the study of mutations and polymorphisms of MYH9 gene in all these patients. As MYH9 syndrome is an autosomal dominant disorder, patients should be heterozygous for a MYH9 gene mutation.
The main goal of our project is looking for correlations between genotype and phenotype. It is planned to characterize the phenotype and genotype of a cohort of patients, including family members that will be addressed during the study in order to better understand the platelet disorder and improve the epidemiological knowledge of MYH9 syndrome. The data will be recorded in a database.
Fechtner Syndrome (Disorder)
Epstein Syndrome (Disorder)
MYH9 Related Disorders
|Study Design:||Observational Model: Cohort|
|Official Title:||Phenotypic and Genotypic Identification and Characterization of MYH9-related Constitutional Thrombocytopenia|
- Study of the correlations phenotype - MYH9 genotype of the patients [ Time Frame: final time frame at the end of the study ] [ Designated as safety issue: No ]
- - Describe the initial clinical symptoms and the long- term evolution of MYH9-related macrothrombocytopenia - Explore the consequences of MYH9 gene mutations on the proplatelets production - Study the effects of MYH9 gene mutations on the platelet [ Time Frame: final time frame at the end of the study ] [ Designated as safety issue: No ]
Biospecimen Retention: Samples With DNA
|Study Start Date:||August 2009|
|Study Completion Date:||July 2015|
|Primary Completion Date:||July 2015 (Final data collection date for primary outcome measure)|
Definition: Extended description of the protocol, including information not already contained in other fields, such as comparison(s) studied. The patients that will participate in the study will be suffering or suspected suffering from MYH9 syndrome.
The study of MYH9 gene will be proposed to the patients but also to both parents of the propositi and other family members (children and adults), whether symptomatic or not. The relatives who will be proved to be heterozygotes for a MYH9 mutation will be considered as new cases and therefore included in the cohort of patients.
Four groups of controls (individuals who are not affected by a decrease in the platelet count) will be constituted:
A1: controls for proplatelets production study A2: controls for platelet proteome study B: controls for MYH9 gene analysis C: controls for leukocytes immunofluorescence study
Patients Patients will be included at the 6 sites of the national Reference Center for Inherited Platelet Disorders (CRPP) after signing an informed consent form. During the visit of inclusion (V1), data usually required for the diagnosis of MYH9 syndrome will be collected: clinical examination, auditory and ocular check, blood tests including MYH9 gene analysis, and search for proteinuria.
Among patients with a MYH9 mutation, a limited number will be recruited in a second step for participating to specific studies focused on the consequences of MYH9 mutations on the proplatelets production and the platelet proteome. The selected patients should be representative of the different phenotypes of MYH9 syndrome. They should be adults and have a platelet count above 50 G / L. A blood sample will be drawn for this purpose during a second visit (V2).
An annual control will be offered at year 1, year 2 and year 3 after inclusion to all the patients confirmed to have MYH9 syndrome (with MYH9 mutation). Each control will include: clinical examination and record of bleeding episodes, if any, during the past year, blood tests, search for proteinuria. The last control (end of the study) will also include auditory and ocular tests.
Relatives The relatives will be included in the study after signing informed consent form during an inclusion visit (VAP) at one of the 6 sites of CRPP. During the visit, a blood sample will be drawn for platelet and MYH9 gene study.
Controls The controls will be included in the study after signing informed consent at 6 sites of the CRPP. During their inclusion visit (VT), a blood sample will be drawn for platelet and MYH9 gene study.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00925236
|Hôpital Robert Debré|
|Paris, France, 75019|
|Principal Investigator:||Nicole Schlegel, MD,PhD||Assistance Publique - Hôpitaux de Paris|