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Last week, the FDA approved Zynteglo, the first gene therapy for individuals with beta-thalassemia. This is a monumental step forward for the entire rare disease community.
Zynteglo is a hematopoietic progenitor cell gene therapy (HSC-GT) to treat a rare disease called beta-thalassemia. This is an elegant type of gene therapy using a patient's own bone marrow stem cells that come from their own blood, which are then personally modified to produce the gene that they are naturally missing. Without treatment these patients become blood transfusion dependent, leading to lifelong challenges. This is a one-time gene therapy that is personalized to each patient’s own bone marrow cells. In this study, after treatment, 89% of patients achieved transfusion independence, ultimately resulting in a curative intent gene therapy. This is the first cell-based gene therapy of this type approved for a rare disease by the FDA. There are many programs similar to this that are currently in clinical trials showing just as promising results, including those for neurologic genetic disorders like metachromatic leukodystrophy (MLD), which has been approved in Europe.
This is relevant for our AS community because FAST has been robustly supporting a very similar program to accelerate a therapeutic for all individuals living with Angelman syndrome since 2016 through University of California Davis. These HSCs are programmed to carry the non-functional gene impacted in Angelman syndrome (UBE3A) and can cross from the blood into the brain (the blood brain barrier). A recent publication here showed that this gene therapy was able to correct all of the behaviors tested in the AS mouse model, in both the newborn and adult age groups. Here is a video by Drs. Abedi and Anderson at the 2021 Annual FAST Science Summit sharing their excitement about this program. We look forward to sharing more at the 2022 Annual FAST Summit and Gala!
Zynteglo’s exciting announcement further paves the way for future advancements for the Angelman community and more broadly for the entire rare disease community where this approach is applicable.
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