New technology could highlight potential treatments for Duchenne muscular dystrophy

Researchers from Queen Mary University of London have developed new cell-based technologies which could improve understanding of the muscle-wasting disease Duchenne muscular dystrophy (DMD) and test potential drugs for the disease.

Combining gene editing and stem cell technology

The new approach, led by Dr Yung-Yao Lin from Queen Mary’s Blizard Institute and supported by Professor Andy Tinker from Queen Mary’s William Harvey Research Institute, uses the latest advances in gene editing and stem cell technology to develop a model of human cells with DMD which mimic what happens in a patient’s muscles.

The team will be using ‘induced pluripotent stem cells’ – adult cells which have been reprogrammed to an embryonic state, so that they can grow to become any type of cell in the body – in this case, skeletal and cardiac muscle cells.

YouTube Video https://www.youtube.com/watch?v=C8u3kAjcEJs

A challenge with comparing diseased and healthy cells in research, however, is that each donor’s muscle cells have a different genetic make-up. This makes it incredibly difficult to accurately demonstrate functional differences between DMD patient and healthy human donor muscle cells.

To overcome this, the researchers have made use of a gene editing tool known as CRISPR. CRISPR is in use by medical researchers all over the world, but normally it is only used to delete sections of DNA – a relatively simple process.

Here, the team are using CRISPR to instead carry out precise editing of the genetic code within DMD patients’ stem cells to ‘fix’ the code and create a healthy muscle cell which has the same genetic make-up as the original patient’s cell.

Rapid testing of potential treatments

Dr Yung-Yao Lin from the Blizard Institute commented:

Dystrophin is the largest gene in humans, comprising 2.4 million base-pairs and 79 separate protein-coding regions. This makes it one of the most difficult genes to correct, but we’ve managed to do it.

We can now use DMD patient skin cells which are stored in the biobank, and turn them into stem cells to generate an unlimited supply of skeletal and cardiac muscle cells in culture dishes. Our genetically-corrected stem cells will also help us establish a cell-based platform to test future drug candidates.

Mark Silverman from the board of trustees of Action Duchenne said:

As both a parent and member of the research committee at Action Duchenne, it is very encouraging to see the breakthrough CRISPR editing tool being used in this way.

There remains a large, unmet need for treatments in Duchenne and families affected by this devastating condition want to see more rapid testing of potential treatments. This exciting news coincides with the release of our latest research strategy, which builds on Action Duchenne’s experience in identifying innovative state-of-the art research.

Collaboration between industry and academia

Professor Francesco Muntoni from the MRC Centre for Neuromuscular Diseases said: “We established a rare diseases biological samples biobank to facilitate research on pathogenesis and translational research for children and adults affected by neuromuscular disorders. I am pleased to see this invaluable resource has played a key role in addressing unresolved questions of pathogenesis of Duchenne muscular dystrophy and is being used to develop novel therapeutic strategies.

The research project to further develop these cell-based technologies for DMD stemmed from the Rare Disease Consortium Initiative, a five-year agreement between Pfizer and the Global Medical Excellence Cluster, of which Queen Mary is one of several university partners. The Rare Disease Consortium Initiative provides resources and a framework for the research and development of new and innovative medicines for rare diseases.

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