Phenotypic and Genotypic Identification and Characterization of MYH9-related Constitutional Thrombocytopenia
Phenotypic and Genotypic Identification and Characterization of MYH9-related Constitutional Thrombocytopenia
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.
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.
Inclusion Criteria:

 1. Thrombocytopenia with large/giant platelets (macrothrombocytopenia=MT)

 2. and at least one of the following criteria:

 -  chronicity of the MT or MT at least found at 2 successive examinations

 -  Leukocyte inclusions in polymorphonuclear neutrophils

 -  Juvenile sensorineural hearing loss

 -  Nephritis

 -  Presenile cataracts

 -  Familial cases with bleeding disorder associated at least with one of the
 following symptoms: thrombocytopenia, nephritis, cataracts, deafness, leukocyte
 inclusions in polymorphonuclear neutrophils

 3. Patient who has given his consent

 4. Patient who has a social insurance -

 Exclusion Criteria:

 -  Other proven constitutional macrothrombocytopenia