Researchers at Boston University applied electron microscopy-based connectomics to follow neurogenesis in the zebra finch, a small songbird known for learning songs. The high-resolution method let them track new neurons as they migrated through adult brain tissue toward established circuits.
Contrary to expectations, the team observed that new neurons often tunnel directly through mature tissue. The cells appeared to push past established structures and mature neurons rather than avoiding them. This behavior could help the brain add new skills or repair damage, but it might also damage existing cells and memories. Benjamin Scott, the study's corresponding author, compared these migrating neurons to explorers forging a path through a dense jungle.
Scott suggested two ideas for what this might mean for humans: brain circuits may limit adult neurogenesis to protect memories, or neurons might move without the usual glia scaffolds and so repair could be possible. His lab is now using single-cell RNA sequencing to study the genes active in migrating neurons. The work included international collaborators and support from the BU Neurophotonics Center.
Difficult words
- neurogenesis — production of new nerve cells in the brain
- connectomics — study of brain connections and networks
- migrate — to move from one place to anothermigrated, migrating
- circuit — network of connected nerve cellscircuits
- glia — support cells in the nervous system
- sequencing — process to read the order of genetic material
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Discussion questions
- The article says brain circuits may limit adult neurogenesis to protect memories. Do you think protecting memories is more important than allowing repair? Why?
- If migrating neurons can repair damaged brain tissue, how might that change people's daily lives or medical treatment? Give one or two examples.
- Researchers use single-cell RNA sequencing to study genes active in migrating neurons. Why would knowing which genes are active help understand how neurons move or repair tissue?
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