🧠 Article Summary
A research team at Columbia University has discovered a unique gene specific to humans called SRGAP2, which plays a central role in the development of brain immune cells known as microglia, and is believed to contribute to delaying the maturation of these cells compared with other animals. This slow maturation is thought to be linked to the human brain’s greater deep cognitive abilities, enhancing our understanding of human neurodevelopment and the cognitive distinctiveness we possess.
🧬 A Unique Human Gene and Its Effect on the Brain
The SRGAP2 gene is one of the genes that were duplicated specifically in humans, and it has been studied by the Franck Polleux laboratory for more than 15 years with the aim of understanding the biological differences between the human brain and the brains of other animals.
Previous studies have shown that SRGAP2 copies lead to:
- An increase in the number of synaptic connections between nerve cells (synapses).
- Slower maturation of these connections, allowing for longer flexibility and development of neural networks.
These characteristics create a denser and stronger neural network, enhancing the brain’s ability to process and store information.
🧠 The Unexpected Role in Brain Immune Cells
Researcher Carlos Diaz-Salazar studied microglia, which are immune cells that make up the largest proportion of the brain’s immune cells and play vital roles in protecting the brain and regulating its growth. He found that copies of the SRGAP2 gene were about 10 times more abundant in these cells compared with nerve cells.
This discovery indicates that this gene has an important role in regulating the maturation of brain immune cells, raising questions about its broader effects on brain functions.
🩺 The Role of Microglia in Coordinating Brain Growth
Microglia make up between 5 and 10% of brain cells, and they are not merely defense cells; they also play an important role in shaping neural circuits during development.
- They help select which synaptic connections remain and which are eliminated.
- They adjust the sensitivity of these connections to precisely regulate communication between nerve cells.
These functions make microglia an essential element in shaping the brain and regulating its cognitive abilities.
⏳ Why Human Microglia Mature Slowly
Experiments on mice and human cells have shown that the copies of SRGAP2 contribute significantly to slowing the maturation of microglia. The human brain needs 4 to 8 years for these cells to mature, compared with only three weeks in mice.
The result is synchronization in the maturation stages of both nerve cells and microglia, allowing balanced development of the brain network.
🌱 The Concept of Neoteny and Its Effect on the Human Brain
Human brains are characterized by a prolonged developmental age compared with other mammals, which scientists call neoteny, or slowed biological development.
Recent findings indicate that the SRGAP2 gene plays a key role in regulating the delayed maturation of several types of brain cells, including nerve cells and microglia.
This delay in maturation allows a longer period for the formation of neural networks, which enhance advanced human cognitive and intellectual abilities.
🧪 The Future Horizon of Research on the Human Brain
Researchers aim to deepen their understanding of how SRGAP2 contributes to this implicit delay across different brain cell types and other tissues. This will be key to understanding the evolutionary characteristics that distinguish the human brain.
The research also sheds light on the role of microglia in neurodegenerative diseases and neurodevelopmental disorders, which may help distinguish healthy traits of the human brain from the neurological diseases associated with it.
🧠 Conclusion
The SRGAP2 gene represents a stable and symbolic factor in human brain development, as it regulates the maturation of microglia and other brain cells in a synchronized and slow manner. This extended maturation contributes to a complex brain structure rich in neural connections, which helps explain humans’ advanced cognitive abilities.
The new research highlights the importance of focusing on microglia not only as immune cells but also as central elements in brain growth and healthy formation, opening promising prospects for understanding neurological diseases from a new and more specialized perspective.
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