Genes Involved in Flatworm Brain Regeneration Identified

Researchers from the University of Georgia have identified several genes that enable planarians, a type of flatworm, to regenerate their brains entirely, according to a study published in Nature Communications. Planarians possess an extraordinary ability to regrow their entire body from a small body fragment, including tissues, muscles, and their brain.

While humans also have stem cells, they are not as effective in transforming into new neurons, which limits our regenerative capacity after injury or disease. The study sheds light on the genes responsible for instructing stem cells to become dopamine-producing neurons and directing those neurons to the correct locations in the worm's body.

The researchers found ten genes and characterized six genes that are critical for specifying mature dopaminergic neurons' neurotransmitter identity and cellular location. When specific genes were "knocked out," planarians struggled to produce new dopamine-producing neurons and experienced slow movement, similar to the effects of low dopamine in humans and other mammals.

The findings suggest that understanding the genetic recipe for creating specific cell types in planarians could help researchers develop better therapies for neurodegenerative diseases and brain injuries in humans. The study's senior and corresponding author, Rachel Roberts-Galbraith, hopes this work will help others understand how to create dopamine-producing neurons from stem cells in a predictable and effective manner for transplants into patients.