- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02634229
Predisposition Genes in Monogenic Diabetes (DIAMONO) (DIAMONO)
Constitution of a Cohort of Families With Monogenic Diabetes to Identify Novel Causes of Non Auto-immune Diabetes Mellitus in Children and Young Adults
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
There are several monogenic disorders of pancreatic beta-cell function, characterized by various degrees of chronic hyperglycemia. They are usually diagnosed early in life, in neonates or during infancy, childhood or even in young adults. These diseases comprise a broad spectrum of diabetic phenotypes including neonatal diabetes mellitus (NDM), non auto-immune diabetes in infancy, dominantly inherited forms of early-onset diabetes [also named Maturity-Onset Diabetes of the Young (MODY)] and very rare diabetes-associated syndromes.
So far, causal mutations in more than 20 genes that are highly expressed in the pancreatic beta-cells have been identified in NDM and MODY. These discoveries have demonstrated several aetiological mechanisms of beta-cell dysfunction that are involved in distinct subtypes of monogenic diabetes, including reduced beta-cell number or development (as for mutations in PDX1, PTF1A, HNF1B), reduced glucose sensing and metabolism (mutations in GCK, INS, HNF1A, HNF4A), failure of membrane depolarization (mutations in KCNJ11, ABCC8) and increased destruction of the beta-cell (mutations in INS, EIF2AK3, WFS1), which result in inadequate insulin secretion despite a chronic hyperglycemia. Additional unknown MODY loci may be responsible for 20-30% of the early-onset diabetes cases with a dominant pattern of inheritance, and a proportion of 50% of the NDM/MDI patients are still unelucidated, suggesting that defects in further pathways in the insulin-secreting beta-cell are responsible for monogenic diabetes.
The investigators project is to collect of 15 MODY-X families. This collection will allow the search of novel genes involved in MODY diabetes. The establishment of the cohort will be based on the recruitment of families of MODY-X probands analyzed in the Department of Genetics (Pitie-Salpetriere hospital). This laboratory performs the genetic testing of MODY. To select families eligible to that project, the investigators will apply the following criteria : (i) probands negative for GCK/MODY2 , HNF1A/MODY3 genes and HNF4A/MODY1; (ii) dominant inheritance of diabetes (three consecutive affected generations, or two generations with at least 2 diabetic patients in a generation); (iii) Diagnosis of diabetes before age 40 years in at least 3 diabetic family members; (iv) negative testing for anti-GAD and IA2-antibodies; and (v) body mass index < 30 kg/m2 (to avoid inclusion of patients with insulin-resistant type 2 diabetes).
The investigators will collect clinical information for the selected cases and families of interest according to a standardized questionnaire.
DNA samples will be collected for diabetic family members and healthy relatives. All will sign an informed written consent.
Study Type
Enrollment (Actual)
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- No mutations in known genes associated with MODY (GCK, HNF1A, HNF4A)
- ≥ 3 cases of diabetes in the family over several generations
- An age at diagnosis of diabetes <40 years for 3 subjects diabetics in the family
- Absence of anti-GAD and anti-A2 of antibodies
- No argument for type 2 diabetes
Exclusion Criteria:
- Diabetic subjects
- Healthy subjects whose relationship is relevant for genetic analysis and necessary for the validation step (family cosegregation study)
- These subjects will be over the age of 18, affiliated to a social protection scheme or copyright holder and will signed an informed consent
Study Plan
How is the study designed?
Design Details
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
Diabetic family members
(i) probands negative for GCK/MODY2 , HNF1A/MODY3 genes and HNF4A/MODY1; (ii) dominant inheritance of diabetes (three consecutive affected generations, or two generations with at least 2 diabetic patients in a generation); (iii) Diagnosis of diabetes before age 40 years in at least 3 diabetic family members; (iv) negative testing for anti-GAD and IA2-antibodies; and (v) body mass index < 30 kg/m2 (to avoid inclusion of patients with insulin-resistant type 2 diabetes).
|
|
Healthy relatives
Healthy subjects whose relationship is relevant for genetic analysis and necessary for the validation step (family cosegregation study)
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Identification of novel predisposition gene
Time Frame: 1 day
|
Identification of pathogenic mutations segregating with the "diabetes" phenotype and absent in unaffected relatives.
|
1 day
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Correlation between genotype and age at diagnosis
Time Frame: 1 day
|
1 day
|
|
Correlation between genotype and BMI
Time Frame: 1 day
|
1 day
|
|
Correlation between genotype and treatment
Time Frame: 1 day
|
1 day
|
|
Correlation between genotype and mode of presentation
Time Frame: 1 day
|
1 day
|
|
Correlation between genotype and complications of diabetes
Time Frame: 1 day
|
1 day
|
|
Correlation between genotype and fasting plasma glucose
Time Frame: 1 day
|
1 day
|
|
Correlation between genotype and HbA1c
Time Frame: 1 day
|
at diagnosis and at last examination
|
1 day
|
Collaborators and Investigators
Investigators
- Study Director: Christine BELLANNE-CHANTELOT, PharmD-PhD, Assistance Publique - Hôpitaux de Paris
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- NI11010
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