Note: Single-source report; awaiting corroboration.
A research team funded by the National Institutes of Health has shown that three-dimensional cell culture models of human brain tissue, known as organoids, can mature over extended periods, mimicking later stages of brain development. This advancement may enable long-term studies of neurodevelopmental conditions such as autism, which develop over nearly two decades in humans.
The study addressed previous challenges in organoid culture, such as limited lifespan and batch variability, by using a method developed by Paola Arlotta and colleagues to produce stem-cell derived cerebral cortex organoids with consistent cellular makeup. The organoids survived and developed for nearly six years while researchers tracked gene expression, structural changes, and biological age markers at single-cell resolution.
Findings included the emergence and maturation of neurons and supporting glial cells, with developmental milestones occurring in a sequence similar to that of the human brain. Biological age clocks trained on human data showed that the organoids’ molecular and chronological ages aligned, suggesting a realistic developmental pace outside the body. Additionally, neurons in the organoids demonstrated functional maturity by forming connections and generating electrical signals.
According to Andrea Beckel-Mitchener, acting director of NIH's National Institute of Mental Health, this development could pave the way for deeper understanding of neurodevelopmental disorders over longer timescales previously unattainable in vitro.
The full report on this research was published by the NIH on August 19, 2026.