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August 16, 2016

CRISPRs Point Way to New Sickle Cell Disease Therapies

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    Sickle cell disease is caused by mutations in a gene encoding the adult-expressed ß-subunit of hemoglobin. [Getty Images/Alex Belomlinsky]

    An international research team led by scientists at St. Jude Children's Research Hospital says it has found a way to use CRISPR gene editing to help fix sickle cell disease and β-thalassemia in blood cells isolated from patients. The study ("A Genome-Editing Strategy to Treat β-Hemoglobinopathies That Recapitulates a Mutation Associated with a Benign Genetic Condition"), which appears online in Nature Medicine, provides proof-of-principle for a new approach to treat common blood disorders by genome editing, according to the investigators.

    "Our approach to gene editing is informed by the known benefits of hereditary persistence of fetal hemoglobin," said Mitchell J. Weiss, M.D., Ph.D., chair of the St. Jude Department of Hematology and one of the study's lead authors. "It has been known for some time that individuals with genetic mutations that persistently elevate fetal hemoglobin are resistant to the symptoms of sickle cell disease and β-thalassemia, genetic forms of severe anemia that are common in many regions of the world. We have found a way to use CRISPR gene editing to produce similar benefits."

    Fetal and adult hemoglobin are two different molecular forms of the essential oxygen-carrying molecule in red blood cells. Hemoglobins are made up of different combinations of four molecular subunits. Sickle cell disease and β-thalassemia are caused by mutations in a gene encoding the adult-expressed β-subunit. Disease becomes apparent after birth as the levels of adult hemoglobin take hold and levels of fetal hemoglobin decline. These mutations can affect the survival of red blood cells and inhibit oxygen delivery to tissues, causing impaired function of different organs with devastating consequences for patients.

    Fetal hemoglobin lacks β-subunits and has γ-subunits instead. Thus, β-thalassemia or sickle cell disease–associated mutations, which impair the production or function of the β-subunit, do not cause problems with fetal hemoglobin, which can transport oxygen effectively in adults.

    Experts have known for some time that inhibiting or reversing "γ-to-β" switching of hemoglobin subunits can raise levels of fetal hemoglobin in adults and significantly ameliorate the debilitating symptoms of β-thalassemia or sickle cell disease.

    "Our work has identified a potential DNA target for genome editing–mediated therapy and offers proof-of-principle for a possible approach to treat sickle cell and β-thalassemia," added Dr. Weiss. "We have been able to snip that DNA target using CRISPR, remove a short segment in a control section of DNA that stimulates γ-to-β switching, and join the ends back up to produce sustained elevation of fetal hemoglobin levels in adult red blood cells."

    When the scientists edited the DNA of blood-forming stem cells derived from patients with sickle cell disease, they were able to activate those genes and produce red blood cells that had enough fetal hemoglobin to be healthy.

    Recently, scientists have used several gene-editing approaches to manipulate blood-forming stem cells for the possible treatment of sickle cell disease and β-thalassemia, including repair of specific disease-causing mutations and other strategies to inhibit γ-to-β switching. All of these approaches remain untested in patients.

    "Our results represent an additional approach to these existing innovative strategies and compare favorably in terms of the levels of fetal hemoglobin that are produced by our experimental system," said Dr. Weiss. Using genome editing to restore the hereditary persistence of fetal hemoglobin is an attractive possibility, because it can be achieved relatively easily using current technologies. The condition is known to be benign in people who inherit similar naturally occurring mutations.

    The researchers want to refine the gene-editing process further and perform other experiments to minimize potentially harmful off-target mutations before in-human clinical trials are considered.
     

     

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