What's Happening?
Researchers at the Salk Institute, in collaboration with global partners, have made a significant contribution to neuroscience by establishing a 3D atlas of the human basal ganglia, featuring single-cell genetic and epigenetic detail. This achievement
is part of a collection of 28 papers published across Cell Press journals. The basal ganglia, a cluster of nerve cells deep within the brain, are vital for functions such as learning, emotion, and movement. Dysfunctions in this region are linked to conditions like Parkinson’s disease, Huntington’s disease, Tourette syndrome, and addiction. The atlas provides a new perspective for scientists to identify and precisely locate individual cells within the human basal ganglia. This extensive database of brain cells and their functions is a product of the Brain Research Through Advancing Innovative Neurotechnologies® Initiative (The BRAIN Initiative®) and specifically the BRAIN Initiative Cell Atlas Network (BICAN), which aims to map brain cells and circuits across multiple species, with a focus on humans.
Why It's Important?
This detailed atlas is crucial for developing novel therapies and understanding the genetic and epigenetic underpinnings of neurological disorders. It allows for the identification of relevant epigenetic and genetic targets for gene-editing therapies and helps link genetic risks to specific cell types, paving the way for more targeted and effective treatments. Salk researchers, for instance, led the epigenetic campaign, profiling methylation and chromatin conformation in 197,003 basal ganglia cells from human donors. This revealed extensive cell types and region-specific methylation patterns, and distinct 3D genome organization in neuronal and non-neuronal cells. This multimodal, single-cell, epigenomic atlas can be used to interpret genetic risk locations for diseases impacting the basal ganglia, offering a foundational community reference for future neuroscience research and potentially enabling personalized therapeutics.
What's Next?
The BICAN team plans to continue its work to map the entire human brain, building on the standardized framework established by this basal ganglia atlas. The online accessibility of the human basal ganglia atlas is expected to foster new discoveries and innovations. While pinpointing specific disease mechanisms and developing therapies will take time, the data holds immense potential to reveal the 'why' behind many neurological and psychiatric conditions. Future artificial intelligence models could utilize this atlas to learn the brain’s regulatory code, potentially predicting the impact of disease-linked genetic variants on specific neurons long before symptoms manifest. This ongoing effort underscores the importance of teamwork in science and aims to provide a foundational understanding of the brain at the genetic, cellular, and connectivity levels to promote brain health.
Beyond the Headlines
The Salk Institute's contribution highlights the critical role of epigenetics in understanding cellular diversity and function. Epigenetic changes, which alter how genetic code is used without changing the code itself, explain how different cell types can arise from the same genetic blueprint. By profiling these changes, researchers gain deeper insights into how gene regulation influences cell identity and function, and how this might go awry in disease. The collaborative nature of The BRAIN Initiative®, bringing together diverse scientific expertise, exemplifies a modern approach to tackling complex biological problems. This project also sets a precedent for creating comprehensive, standardized atlases for other organs, potentially revolutionizing medical research beyond neuroscience. The open sharing of data and tools further promotes scientific advancement, ensuring that this foundational work can be leveraged by the broader research community worldwide.
