Early Genetic Identification of Obesity

Inclusion criteria: * Informed consent is obtained from the participant/parent/legal guardian * The participant is 2 years of age or older For a participant between 2 and 18 years of age: * The participant has and had a body weight more than 97th percentile before the age of 6 * The participant has one or more of the following symptoms: rod/cone dystrophy, renal abnormalities, ataxia, syndactyly, polydactyly, brachydactyly, hyperphagia, cognitive impairment, speech delay, hypogonadism For a participant who is 18 years of age or older: * The participant has BMI ≥ 30 kg/m2 * The participant had a body weight more than 97th percentile before the age of 6 years * The participant has rod/cone dystrophy * The participant is 2 or more years of age, is clinically diagnosed with Bardet-Biedl-Syndrome (BBS) or is a sibling of an individual diagnosed with BBS via the WEGIO study Exclusion criteria: \- Not fulfilling the inclusion criteria