STAR Gene Therapy | Charcot-Marie-Tooth Association
Posted: March 11, 2019 at 5:41 pm
The CMTA Is Accelerating Research Through Gene Therapy
The CMTA looks forward to a time when doctors are able to use genetic therapies to treat the root cause of CMT rather than prescribing medications or recommending surgery. We are already envisioning the possibilities that gene therapy holds for our community of 2.8 million people worldwide living with CMT. In fact, were leading the pursuit to explore gene therapy in CMT by expanding our Strategy to Accelerate Research (STAR) program and our STAR Advisory Board.
At the CMTA, we are already envisioning the possibilities that gene therapy holds for our community of 2.8 million people worldwide living with CMT. John Svaren, PhD, Chair, CMTA Scientific Advisory Board
Given the increased feasibility and applicability of gene therapy to CMT, the CMTA hosted a Gene Therapy Workshop in 2018. In response to invitations from CMTA board member Dr. Steven Scherer, more than 20 of the top gene therapy experts gathered for the inaugural CMT-centered workshop on gene therapy. This meeting included experts who have worked in related genetic and neuromuscular disease areas, as well as clinicians and scientists spearheading efforts toward gene therapy for CMT2D and CMT4J.
Building on this meeting, the CMTA is assembling the best experts to formulate gene therapy strategies for CMT2 and CMT1 subtypes. Four gene therapy experts, Beverly Davidson, PhD, at the University of Pennsylvania, Kleopas Kleopa, MD, at the Cyprus Institute of Neurology & Genetics, Scott Harper, PhD, at the Ohio State University School of Medicine, and Steven Gray, PhD, at the University of Texas Southwestern Medical Center have now joined the Scientific Advisory Board of the CMTA. Dr. Davidson is an acknowledged leader in the gene therapy field, and her extensive experience includes both academic research and commercial translation gene therapy approaches. Dr. Kleopa has shown proof of concept that gene therapy works in two mouse models of CMT: CMT1X and CMT4C. This strategy can capitalize on the CMT animal models that have been developed and characterized with CMTA support. Dr. Harper is collaborating with Robert Burgess, PhD, at the Jackson Laboratory to develop a gene therapy vector to be used in a treatment for CMT2D. Dr. Grays core expertise is in Adeno-Associated Virus (AAV) gene therapy vector engineering, followed by optimizing approaches to deliver a gene to the nervous system, with application to CMT4J.
Our genes dictate many of our personal characteristics; however, mutations in genes cause genetic diseases, such as CMT. Scientists have been working for decades to modify or replace faulty genes with healthy ones to treat, cure or prevent disease. Fortunately, we are seeing significant progress on these efforts to provide gene therapy options for CMT. In fact, recent studies have provided an effective gene therapy for spinal muscular atrophy (SMA), a devastating disorder that affects the same motor neurons that are affected by CMT.
Sometimes the whole gene is duplicated, as in CMT1A, where a chromosome segment around the PMP22 gene is present in three copies instead of two. Alternatively, a part of a gene is defective or missing from birth, causing many of the other known forms of CMT. Any of these variations can disrupt the structure of the protein that is encoded by the affected gene, causing cellular problems that ultimately lead to disease.
In gene therapy, scientists can do one of several things depending on the problem with the gene. The simplest form of gene therapy is to simply provide a correct copy of the gene, which is the basis of the gene therapy for SMA. In variations of this approach, genes that are causing problems can be suppressed. One example of this was the recent demonstration that antisense oligonucleotides can be used to improve the neuropathy in rodent models of CMT1A. In addition, the exciting new field of genome editing using CRISPR technology has now made it possible to correct disease-causing mutations, and collaborative projects have already been initiated with leaders in this field
In order to insert new genes directly into cells, scientists use a vehicle called a vector that is genetically engineered to deliver the correct version of the gene. For example, viruses have a natural ability to deliver genetic material into cells, and therefore, can be used as vectors. While some viruses cause disease, virus vectors are highly modified to remove their ability to cause disease so that they can be safely used to carry therapeutic genes into human cells.
Gene therapy can be used to modify cells inside or outside the body. When its done inside the body, a doctor will inject the vector carrying the gene directly into the part of the body that has defective cells.
Before a company can market a gene therapy product for use in humans, the gene therapy product has to be tested for safety and effectiveness so that the Food and Drug Administration (FDA) can evaluate whether the risks of the therapy are acceptable in light of its potential benefits. Gene therapies have begun to receive FDA approval, and many gene therapies are in clinical trials.
At the CMTA, we believe gene therapy holds the promise to provide effective therapies for people living with CMT. As we continue to make great strides in this area, the CMTA is committed to helping speed the development of gene therapy approaches by investing in the most promising and groundbreaking gene therapy treatments that have the potential to benefit our community.
We are members of the National Organization for Rare Disorders (NORD), and they have put together a six-minute video to help answer questions frequently asked about gene therapy. We think this video will help you better understand the basics of gene therapy.
See the article here:
STAR Gene Therapy | Charcot-Marie-Tooth Association
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