Genetic overgrowth/obesity syndrome

Genetic overgrowth/obesity syndrome (Orphanet code 183573) is not a single disease but rather a broad classification group encompassing a collection of rare genetic conditions characterized by excessive body growth, obesity, or both. These syndromes share the common features of abnormal regulation of growth and/or energy metabolism, leading to increased body size, excessive weight gain, or disproportionate tissue overgrowth. Conditions within this category may affect multiple body systems including the endocrine system, skeletal system, nervous system, and metabolic pathways. Key clinical features across this group of disorders can include early-onset or severe obesity, tall stature or generalized overgrowth, intellectual disability, dysmorphic facial features, and various endocrine abnormalities. Some syndromes in this category may also present with organomegaly, hyperphagia (excessive hunger), and developmental delay. The specific combination and severity of symptoms depend on the underlying genetic cause, which may involve mutations in genes regulating growth factor signaling, energy homeostasis, or epigenetic mechanisms. Because this is a grouping category rather than a single disease entity, the inheritance patterns, genetic causes, and management strategies vary widely among the individual conditions classified under this umbrella. Treatment is generally supportive and symptom-based, and may include dietary management, behavioral interventions for hyperphagia, endocrine therapies, and monitoring for associated complications such as metabolic syndrome, cardiovascular disease, or tumor predisposition. Patients are encouraged to seek evaluation by a clinical geneticist to identify the specific underlying syndrome, which can guide more targeted management and genetic counseling.

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