I heard from a science journalist friend of a friend that the genetic medicine is going to be very exciting with the further development of single-cell RNA sequ

I heard from a science journalist friend of a friend that the genetic medicine is going to be very exciting with the further development of single-cell RNA sequencing. To put it incredibly crudely, DNA is the blueprint for an organism and it's the same in all cells. RNA is the expression of the DNA in a particular cell and shows you what that cell is doing, and with which genes. Imagine the difference between diagnosing a genetic issue when you have information true for all cells versus knowing about the action of a particular cell of interest. When applied to the brain it's possible we might have biological descriptions of conditions previously only psychologically identifiable.