Brain organoid models of Huntington's disease shift the focus towards neurodevelopment.

Huntington's disease (HD) is traditionally viewed as an age-related disorder. Emerging evidence suggests that mutant huntingtin (mHTT) disrupts early neurodevelopment, although the contribution of developmental alterations to the late disease onset remains to be clarified. Leveraging human pluripotent stem cell-derived brain organoids, we and others are exploring how mHTT affects the developing human brain. These models reveal impaired neural progenitor organization and function, accompanied by a mitochondrial stress response, indicating reduced capacity to manage cellular stress. Enhancing mitochondrial health and promoting neural cell resilience may thus represent potential strategies for improving the brain's compensatory mechanisms, thereby prolonging a healthy state. These insights highlight a potential window of opportunity for therapeutic interventions. Targeting mitochondrial fitness and neurodevelopmental pathways at early stages - long before clinical symptoms emerge - could help prevent or delay disease onset and progression in affected individuals.