RADIANT

About this trial

Last updated 3 years ago

Study ID

RADIANT

Status

Recruiting

Type

Observational

Placebo

Accepting

All

Not accepting

Healthy Volunteers

Trial Timing

Started 5 years ago

RADIANT is a network of 14 clinical sites and several laboratories dedicated to the study of atypical diabetes. The objective of this study is to define new forms of diabetes and the unique mechanisms underlying these forms of atypical diabetes. The specific aims are to: 1. Identify and enroll individuals and families with undiagnosed rare and atypical forms of diabetes. 2. Determine the etiologic basis of the metabolic disorder among individuals and families with novel forms of rare and atypical diabetes. 3. Understand the pathophysiology of individuals and families with novel forms of rare and atypical forms of diabetes.

Inclusion Criteria

The following criteria or phenotypes will be considered for suspecting "atypical" participants: - Type 2 diabetes diagnosed at a time when the individual was prepubertal or non-obese - Mendelian pattern, especially with early onset (<18 years old) - Syndromic (multiple systems involved) - Lipodystrophic - Extremes of BMI - "Mitochondrial" characteristics (e.g., myopathy, hearing deficits) - Non-progressive - Rapidly progressive ("fulminant") - Low insulin requirements (<0.5 u/kg/day) - Cyclical hyperglycemia with periods of remission - Lean persons with polycystic ovarian syndrome (PCOS) - History of gestational diabetes (GDM) when lean - Lean insulin-resistant persons - If islet autoantibodies and beta-cell function parameters have been measured (where "A" = islet cell autoantibodies, "B" = beta-cell function): oA-B- (i.e., lacking islet autoimmunity makers and lacking beta cell function) oA-B+ with unprovoked DKA at initial presentation (i.e., lacking islet autoimmune markers, with preserved beta-cell function, but presenting with unprovoked DKA) oA-B+ of very young onset (pre-pubertal) (i.e., lacking islet autoimmune markers, with preserved beta-cell function, but very early onset T2D-like phenotype)

Exclusion Criteria

- Those with high likelihood of typical type 1, typical type 2, known monogenic, or other known secondary forms of diabetes - Refusal of consent for genetic testing - Islet autoantibody positive (participants who are islet autoantibody positive but present with additional atypical features i.e. syndromic, strong linear family history of diabetes may not be excluded) - Women who are currently pregnant