A series of four studies helps scientists understand the development of different types of brain cells.
. They then used their analysis to create a map, called a cell-type atlas, of the different types of cells throughout the brain of the lizard, which is common to Australia and covered in clusters of spiny scales.
The team compared the cell-type atlas of the bearded dragon’s brain to that of the mouse’s brain, and found that the cell types in broad brain regions correspond to one another. They classified these cells as "conserved," meaning that their expression stays the same over time and across species as a result of natural selection.
That said, comparing the bearded dragon’s and the mouse’s cell-type atlases more closely, the team found several distinct types of cells between the two animals in more specific brain regions. This coexistence of conserved and distinct cell types, the scientists say, indicates that the cells in these areas are plastic, able to change and evolve as time passes.
According to the scientists, the three additional studies only strengthened the first findings. Using single-cell transcriptomics once again, the teams assembled cell-type maps of the telencephalon area of the amphibian brain, particularly that of the, a frilled aquatic salamander from Mexico. They then used these maps to isolate cells unique to amphibians and axolotls, paying particular attention to the cells involved in brain regeneration after injury.
"These studies highlight the potential of applying the powerful transcriptomic methods that are usually reserved for mouse to nonstandard models," conclude Lehigh University researchers Dylan Faltine-Gonzalez and Justus Kebschull in
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