A special gene lets yaks and Tibetan antelopes live on the roof of the world. New research shows the same gene can help mouse brains stay healthy when oxygen is thin.
Why Myelin Matters
Myelin is a thin coat that wraps around nerve fibers. It makes electrical signals move fast. When myelin is damaged, signals slow down and brain problems appear.
Low oxygen during early life can hurt myelin, causing cerebral palsy. In adults, myelin loss is a hallmark of multiple sclerosis (MS) and can also lead to dementia.
High‑Altitude Mutation in the Retsat Gene
Animals on the Tibetan Plateau carry a change in the Retsat gene. Scientists think this mutation protects their brain cells from thin air.
To test this, researchers gave newborn mice a low‑oxygen environment similar to 13,000‑plus feet altitude for a week. Mice with the Retsat mutation learned better, remembered more, and were friendlier than mice without it. Their brains also had more myelin.
Faster Myelin Repair
The team then looked at mice that already had myelin damage, like what happens in MS. Mice with the mutation repaired their myelin faster and more completely. They also had more mature oligodendrocytes – the cells that build myelin.
Vitamin A Metabolite Helps
Mutant mice made higher levels of ATDR, a molecule made from vitamin A. ATDR helps oligodendrocytes grow and mature, which in turn restores myelin.
When scientists gave ATDR to mice with an MS‑like disease, the animals showed milder symptoms and moved better.
A New Way to Fight MS?
Current MS drugs mainly calm the immune system. This study suggests a different path: using a natural vitamin‑A‑derived molecule to rebuild myelin.
Because ATDR already exists in the human body, it could become a safe, low‑cost option for treating diseases that damage myelin.