Brain Evolution Research from Stanford: 500 Million Years of Distinct Cell Groups
A study published in Nature Neuroscience reveals that the front and back parts of the brain evolved through independent pathways dating back millions of years.
A new study conducted at Stanford University is changing what is known about brain development by revealing that the front and back parts of the brain evolved from distinct cell groups and via independent pathways dating back 500 million years.
Two Parts of the Brain Evolve Through Different Pathways
According to the study published in the journal Nature Neuroscience, it has been shown for the first time that the front part of the brain emerged from a completely different cell group than the back part. Researchers state that the findings could lead to a reassessment of the widespread assumption that the brain developed as a single and continuous structure.
Embryo Examination and Cell Groups
The research team examined the early developmental stages of mouse embryos and identified two separate progenitor cell groups that will form the fore-midbrain and the hindbrain. The fact that these cell groups have different chromatin structures caused them to continue their development through independent pathways.
A New Door for Disease Research
The hindbrain plays a crucial role in controlling breathing, movement, and other basic vital functions. Researchers successfully converted pluripotent stem cells into hindbrain motor neurons in a laboratory setting, stating that this method could be used to study brainstem-affecting diseases such as ALS.
Evolutionary Traces and Different Species
The team detected similar developmental distinctions not only in mice but also in zebrafish, chickens, and certain organisms with more distant evolutionary relatives. Researchers pointed out that jellyfish, a more distant species, possess two separate nervous systems.
Single Organ and Evolutionary Process
According to the study, the convergence of different nervous systems over time may have played a role in the formation of the brain, which functions as a single organ today. Researchers evaluate that the forebrain may have paved the way for the development of more complex functions.