Reprogramación del desarrollo en neuronas de melanocortina modula la obesidad inducida por la dieta en ratones

Central melanocortin neurons are essential regulators of energy balance in mammals. Specifically, hypothalamic proopiomelanocortin (POMC) neurons promote satiety, while agouti-related peptide (AgRP) neurons drive hunger. Despite their well-understood roles in adulthood, the developmental processes that shape this system remain poorly understood. Pomc-expressing precursors give rise to multiple neuronal subtypes, including a subset of adult AgRP neurons, but the precise mechanisms guiding these fate transitions-and their lasting impact on metabolic health-have remained unknown. Here, we show that the transcription factor Otp directs a developmental fate switch between POMC and AgRP neuron identities. Loss of Otp in Pomc-expressing precursors disrupts this switch, altering the balance of anorexigenic and orexigenic neurons in the adult hypothalamus. This developmental event is critical for programming susceptibility to diet-induced obesity in mice. Our findings highlight the remarkable plasticity within the developing melanocortin system and underscore the importance of using refined genetic tools to target these neurons more precisely.