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Sickle-cell anemia is an autosomal recessive disorder that affects 1 in 500 African Americans, and is one of the most common blood disorders in the United States. [17] The single replacement of the sixth amino acid in the beta-globin, glutamic acid, with valine results in deformed red blood cells. These sickle-shaped cells cannot carry nearly ...
In addition, there is sickle cell trait (HbAS) which is defined by having HbA and HbS. This makes the individual heterozygous for sickle cell. Of the world population, it is estimated that there are about 300 million individuals with the sickle cell trait and about 100 million of those are in sub-Saharan Africa. [18]
New gene therapies promise a cure for sickle cell disease, and Dongre says he’s “praying the treatment should come to us.” Vast inequities cut much of the world off from gene therapy in general.
Fetal hemoglobin, or foetal haemoglobin (also hemoglobin F, HbF, or α 2 γ 2) is the main oxygen carrier protein in the human fetus.Hemoglobin F is found in fetal red blood cells, and is involved in transporting oxygen from the mother's bloodstream to organs and tissues in the fetus.
Sickle-cell versions of hemoglobin stick to themselves, stacking to form fibers that distort the shape of red blood cells carrying the protein. These sickle-shaped cells no longer flow smoothly through blood vessels, having a tendency to clog or degrade, causing the medical problems associated with this disease. [citation needed]
Gene editing therapies aimed at increasing fetal hemoglobin production in beta thalassemia as well as sickle cell anemia by inhibiting the BCL11A gene have been developed. [ 44 ] [ 45 ] Exagamglogene autotemcel , sold under the brand name Casgevy, is a gene therapy for the treatment of transfusion-dependent beta thalassemia developed by Vertex ...
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