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New precision medicine ‘edits’ sickle cell gene and allows researchers to regrow normal blood cells.

Researchers at Johns Hopkins have successfully corrected a genetic error in stem cells from patients with sickle cell disease, and then used those cells to grow mature red blood cells, they report. The study represents an important step toward more effectively treating certain patients with sickle cell disease who need frequent blood transfusions and currently have few options.  The study is published in the journal Stem Cells.

In sickle cell disease, a genetic variant causes patients’ blood cells to take on a crescent, or sickle, shape, rather than the typical round shape. The crescent-shaped cells are sticky and can block blood flow through vessels, often causing great pain and fatigue. Getting a transplant of blood-making bone marrow can potentially cure the disease. But for patients who either cannot tolerate the transplant procedure, or whose transplants fail, the best option may be to receive regular blood transfusions from healthy donors with matched blood types.

The researchers explain that the problem is that over time, patients’ bodies often begin to mount an immune response against the foreign blood.  Their bodies quickly kill off the blood cells, so they have to get transfusions more and more frequently.

The lab theorised that a solution could be to grow blood cells in the lab that were matched to each patient’s own genetic material and thus could evade the immune system. The group had already devised a way to use stem cells to make human blood cells. The problem for patients with sickle cell disease is that lab-grown stem cells with their genetic material would have the sickle cell defect.

To solve that problem, the researchers started with patients’ blood cells and reprogrammed them into so-called induced pluripotent stem cells, which can make any other cell in the body and grow indefinitely in the laboratory. They then used a relatively new genetic editing technique called CRISPR to snip out the sickle cell gene variant and replace it with the healthy version of the gene. The final step was to coax the stem cells to grow into mature blood cells. The edited stem cells generated blood cells just as efficiently as stem cells that hadn’t been subjected to CRISPR, the researchers found.

The researchers note that to become medically useful, the technique of growing blood cells from stem cells will have to be made even more efficient and scaled up significantly. The lab-grown stem cells would also need to be tested for safety. However, this study shows it may be possible in the not-too-distant future to provide patients with sickle cell disease with an exciting new treatment option.

The team summise that this method of generating custom blood cells may also be applicable for other blood disorders, but its potential does not end there. One possibility, which the group plan to begin studying soon, is that the blood cells of healthy people could be edited to resist malaria and other infectious agents.

Source:  Johns Hopkins Medicine 


These are human blood cells grown in the lab from genetically edited stem cells.  Credit:  Ying Wang/Johns Hopkins Medicine.
These are human blood cells grown in the lab from genetically edited stem cells. Credit: Ying Wang/Johns Hopkins Medicine.

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