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Potential gene therapy approach to sickle cell disease highlighted at ASH
Date:12/11/2012

y, suggesting that strategies targeting a molecular switch called BCL11A have the potential to correct sickle cell disease.

First described over 100 years ago, sickle cell disease (or sickle cell anemia) is an inherited blood disease caused by a single mutation in one of the components of hemoglobin, the oxygen-carrying protein in red blood cells. The mutation reduces the protein's ability to carry oxygen and forces the cells to curve into a distinctive crescent or sickle shape.

Our bodies can actually manufacture two forms of hemoglobin: the adult form susceptible to the sickle cell mutation, and a fetal form that is largely produced during development and for a short time after birth. BCL11A is a transcription factor that facilitates that shift in hemoglobin production. Fetal hemoglobin expression significantly reduces the symptoms and complications of sickle cell disease because it prevents the intracellular abnormalities caused by the sickle mutation.

In their abstract, Renella, Orkin, Williams and their colleagues reported on their efforts to develop a combined lentiviral gene transfer/RNA interference approach capable of turning down BCL11A in vitro in human and mouse cells and in vivo in a mouse bone-marrow transplant model. Among their findings, the researchers documented a five- to 20-fold increase in fetal hemoglobin production in treated mice.

The team is quick to note that they have not yet attempted to correct disease in a model of sickle cell using this approach. Such efforts would be carried out in future studies.

"There are many approaches to sickle cell disease, and while we've shown we can develop viral vectors, knock down BCL11A, and induce fetal hemoglobin production, it's all been done in non-disease model systems," cautioned Renella, a fellow in the Williams laboratory at DF/CHCC. "What we don't yet know is whether we can stop production of sickled cells in a sickle cell system. Further experim
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SOURCE Boston Children's Hospital
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