Innovations in Science
Grant - Winter 2019 - DM - Matthew Disney, PhD
"We hope to establish a new paradigm in drug design in which one can target RNA with small molecules and use small molecules to destroy toxic RNAs."
Matthew Disney, PhD, professor of Chemistry at The Scripps Research Institute, Florida, was awarded an MDA research grant totaling $300,000 over three years to develop and optimize small molecules targeting the RNA repeats in myotonic dystrophy type 2 (DM2).
DM2 is a neuromuscular disease that causes wasting of many muscles, as well as cardiac disease and cataracts. It is caused by an abnormally expanded section in a gene on chromosome 3 called ZNF9. The DM2 repeat expansion is present in the highest amounts in muscle and heart tissue. This repeat expansion leads to aggregates of RNA inside the cell that become toxic in DM2, effectively sequestering a protein that normally regulates how RNA is spliced (processed). Inactivating this RNA-processing protein has been shown to cause many of the symptoms associated with myotonic dystrophy.
In this work, Dr. Disney will focus on inactivating and eliminating the repeat expansion. He and his team previously designed small molecules that bind to and inactivate the toxic RNA in cellular models. They will build off that work to optimize their small-molecule compounds to both bind the RNA as well cleave it, thus ridding the cell of it. Specifically, he will conduct medicinal chemistry on lead compounds, assemble them into dimers to increase potency and selectivity, give the dimers the ability to cleave the RNA, and test them both in vitro (in patient-derived cells) and in animal models.
https://doi.org/10.55762/pc.gr.84545
Grantee: DM - Matthew Disney, PhD
Grant type: Research Grant
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Grant - Winter 2019 - ALS - Marka Van Blitterswijk, MD, PhD
"By increasing our understanding of this debilitating disease, especially its causes, I am optimistic that we might be able to discover novel biomarkers or druggable targets. Ultimately, I am hoping that this knowledge will aid the development of personalized treatments that can halt, or reverse, the disease progression."
Marka Van Blitterswijk, MD, PhD, assistant professor of Neuroscience at the Mayo Clinic in Jacksonville, Fla., was awarded an MDA research grant totaling $300,000 over three years to complete an in-depth analysis of the C9ORF72 gene mutation in amyotrophic lateral sclerosis (ALS) patients and determine whether the size of the mutation can be used as a biomarker to predict factors such as survival time and cognitive changes. This work is a collaboration between the labs of Dr. Van Blitterswijk and Mark Ebbert, PhD, assistant professor of Neuroscience at the Mayo Clinic.
Although most cases of ALS are sporadic, meaning there is no family history of the disease, about 10 percent of cases are familial, meaning the disease runs in the family. Recently, it was discovered that a mutation in the C9ORF72 gene where one segment of the gene is repeated too many times — also known as a repeat expansion — is the most common cause of the familial form of ALS and is also found in some sporadic cases as well.
Discovery of the C9ORF72 repeat expansion has provided some knowledge of disease mechanism, but it’s still unknown how or whether interruptions in the repeated genetic material affect disease variability, development, and progression. In previous work, Dr. Van Blitterswijk acquired a large amount of clinical and pathological data from ALS repeat expansion patients, creating one of the world's largest collections of this type of information. In this study, she will use a novel technology called long-read single-molecule real-time (SMRT) sequencing on these clinical samples to determine the repeat’s exact size, whether it is interrupted, whether other changes to the DNA exist in addition to the repeated segments, and whether it is stable over time. This work could eventually pave the way for future therapies and diagnostics based on the variability found in the repeat expansion.
Grantee: ALS - Marka Van Blitterswijk, MD, PhD
Grant type: Research Grant
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Grant - Winter 2019 - MC - Mark Rich, MD, PhD
"More recently we have discovered other currents in skeletal muscle that we are currently characterizing in mouse models of diseases to determine whether block of these currents is effective in treating muscle dysfunction. We are optimistic that continued funding of our work by the MDA will lead to novel therapies for patients with these diseases."
Mark Rich, MD, PhD, professor of Neuroscience, Cell Biology, and Physiology and professor of Neurology at Wright State University, Ohio, was awarded an MDA research grant totaling $300,000 over three years to investigate blocking the transient receptor potential ion channel type 4 protein (TRPV4) as a novel approach to treating myotonia congenita (MC).
MC is an inherited myopathy that causes muscles to become still from contracting too much. Using mouse models, Dr. Rich discovered a novel electrical current in skeletal muscle that is the likely cause of this muscle stiffness, and MDA funded a past proposal for which he characterized this current and tested drugs known to have an effect on skeletal muscle currents as potential therapeutics. This work led to two clinical trials of the drug ranolazine in patients with myotonia caused by mutations in muscle chloride and sodium channels.
Recently, Dr. Rich developed a novel in vitro (in a petri dish) system test; preliminary data from this test suggested that the TRPV4 protein plays a large role in myotonia. In this work, he will use pharmacologic and genetic studies in vitro and in mouse models to discover if blocking TRPV4 protein may be targeted therapeutically by drugs currently being used to treat heart failure in clinical trials. This approach might make clinical translation of a drug to treat MC much more rapid if his findings are promising.
https://doi.org/10.55762/pc.gr.84562
Grantee: MC - Mark Rich, MD, PhD
Grant type: Research Grant
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Grant - Winter 2019 - DMD - M. Carrie Miceli, PhD
"Identification of immune populations involved in DMD pathogenesis may aid in identifying therapeutic targets. Assessing baseline levels of immunity in DMD subjects will help in interpreting responses observed in gene therapy or other dystrophin replacement therapies."
M. Carrie Miceli, PhD, professor of Microbiology, Immunology, and Molecular Genetics at the University of California, Los Angeles, was awarded an MDA research grant totaling $300,000 over three years to study the differences in immune cell populations in response to treating boys who have Duchenne muscular dystrophy (DMD) with or without corticosteroids.
Corticosteroids delay symptoms and prolong life in DMD, but their mechanism of action is poorly understood. In people with DMD, the immune response affects the regeneration of muscle tissue and leads to fibrosis (an excess of fibrous connective tissue), though these cellular processes are not well defined. Additionally, gene-replacement therapies use entities that can cause an immune response and therefore have limited efficacy. Achieving a basic understanding of the immune response in DMD will help researchers conduct studies that help define this landscape and may promote the development of therapies based on these factors.
In this research, Dr. Miceli aims to deeply characterize the cellular immune composition in blood and muscle cells in individuals with DMD or Becker muscular dystrophy (BMD), a similar muscular dystrophy with later onset of symptoms. She hopes to gain an improved understanding of which immune populations are activated to identify targets for immune modulation that may promote regeneration, limit fibrosis, or induce tolerance. In addition, determining the relationship between the responses in the muscle and blood will allow her to test whether blood can be used as a measure of the severity of the disease.
https://doi.org/10.55762/pc.gr.84558
Grantee: DMD - M. Carrie Miceli, PhD
Grant type: Research Grant
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Grant - Winter 2019 - Mitochondrial Myopathy - Luis Lopez Garcia, PhD
"We expect to learn more about the CoQ metabolism in health and disease, including regulatory mechanisms of CoQ biosynthesis and the identification of interventions to stimulate the endogenous CoQ biosynthesis."
Luis Lopez Garcia, PhD, professor of Physiology at University of Granada in Spain, was awarded an MDA research grant totaling $289,865 over three years to test therapeutic molecules for the treatment of mitochondrial disease caused by deficiency of coenzyme Q10 (CoQ10).
Mitochondria provide cells with all the energy they need to function properly. CoQ10 is an essential component of mitochondrial energy production, and CoQ10 deficiency has been identified in several neuromuscular and neurologic diseases. However, CoQ10 is not a viable therapeutic because very little of it ends up being bioavailable. In previous MDA-funded work, Dr. Lopez Garcia created a mouse model to study the mechanisms behind mitochondrial disease caused by CoQ10 deficiency and discovered that 4-hydroxybenzoic acid (4-HB) analogs have greater therapeutic potential than oral CoQ10. (CoQ10 is made by several enzymes from the precursor molecule, 4-HB.)
In this research, Dr. Lopez Garcia will test these 4-HB small molecule analogs to see if they improve different types of mouse models of mitochondrial myopathies.
https://doi.org/10.55762/pc.gr.84555
Grantee: Mitochondrial Myopathy - Luis Lopez Garcia, PhD
Grant type: Research Grant
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Grant - Winter 2019 - Mitochondrial Myopathy - Luca Scorrano, MD, PhD
"We expect to provide a proof of principle that we can curtail the progression of mitochondrial myopathies by acting not on their cause, but on their amplificatory mechanism, i.e., the disruption of mitochondrial ultrastructure."
Luca Scorrano, MD, PhD, professor of Biochemistry at the University of Padova and scientific director of the Venetian Institute of Molecular Medicine in Italy, was awarded an MDA research grant totaling $286,935 over three years to study the structural integrity of mitochondria, the role of epigenetic silencing in creating pathogenic structures, and how that impacts mitochondrial energy metabolism and survival.
Mitochondrial diseases are caused by structural and/or functional abnormalities in mitochondria — tiny energy factories found inside almost all our cells. With previous MDA funding, Dr. Scorrano conducted proof-of-principle studies to show that microRNAs expressed when cells are stressed can compromise mitochondrial structure and function by reducing levels of expression of the optic atrophy 1 gene (Opa1), which codes for a mitochondria-shaping protein.
In this research, Dr. Scorrano will test specific microRNA antagonizers — molecules that block the function of microRNAs — for their therapeutic potential against the microRNAs targeting Opa1. This novel approach could be applicable other mitochondrial myopathies and neuromuscular disorders as well as to certain sporadic, high-prevalence disorders like heart ischemia.
https://doi.org/10.55762/pc.gr.84563
Grantee: Mitochondrial Myopathy - Luca Scorrano, MD, PhD
Grant type: Research Grant
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Grant - Winter 2019 - CMT - Kleopas Kleopa, MD
"By establishing an effective, clinically applicable gene therapy approach targeting peripheral nerves, we may be able to develop treatments for a number of other similar inherited neuropathies or even for more common acquired neuromuscular disorders such as motor neuron disease and inflammatory neuropathies."
Kleopas Kleopa, MD, professor and senior consulting neurologist at the Cyprus Institute of Neurology and Genetics, Cyprus School of Molecular Medicine, in Nicosia, Cyprus, was awarded a research grant jointly funded by the Charcot-Marie-Tooth Association (CMTA) and MDA totaling $276,430 over three years to perform critical, proof-of-concept studies to test whether delivery of the connexin 32 gene (Cx32) using an adeno-associated virus (AAV) vector can improve symptoms in a mouse model of CMT1X, as well as determine the optimal route for delivery of the therapy.
Mutations in the gene coding for the gap junction beta-1 protein (GJB1), also known as connexin 32 (Cx32), are associated with the X-linked form of Charcot-Marie-Tooth disease (CMT1X), which affects approximately 1 in 25,000 people and is the second-most-common form of CMT. With previous MDA-funded support, Dr. Kleopa pioneered a gene therapy approach to treat CMT1X, showing that a single spinal injection of the Cx32 gene was associated with production of normal protein in nerves and improvement of peripheral nerve health and motor performance in a mouse model of CMT. In a follow-up study co-funded by the MDA and the CMTA, he examined whether repeated injections in mice led to increased protein levels and tested whether treatment at later stages of the disease led to improvement like that seen for treatment in the early stages.
The target cell type for this therapy is the Schwann cell, which generates the insulating myelin sheath around peripheral nerves. The challenge for CMT1X and other demyelinating forms of CMT is optimizing delivery of the gene to Schwann cells. In previous studies, Dr. Kleopa employed a different type of viral vector to deliver the Cx32 gene, but for this new study he will adapt this approach to AAV, which has been more widely used in the nervous system and shown promise in clinical studies for other diseases. The project will test several types of AAV and different injection paradigms to determine the best method to restore the function of Cx32 in Schwann cells. Positive results may help advance development of treatments for other types of CMT affecting Schwann cells, as a similar AAV approach can be applied to CMT1A and other subtypes of CMT1.
https://doi.org/10.55762/pc.gr.84552
Grantee: CMT - Kleopas Kleopa, MD
Grant type: Research Grant
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Grant - Winter 2019 - DMD - Kevin Flanigan, MD, PhD
Kevin Flanigan, MD, PhD, attending neurologist at Nationwide Children’s Hospital in Columbus, Ohio, and professor of Pediatrics and Neurology at The Ohio State University College of Medicine, was awarded an MDA Human Clinical Trial Grant totaling $528,798 over two years to conduct a pilot clinical trial in Duchenne muscular dystrophy (DMD) boys aged 4 to 7 years old to study treatment with spironolactone relative to prednisolone.
The mineralocorticoid receptor antagonist spironolactone is an approved drug that has been shown to protect skeletal and cardiac muscle function in DMD mice. Because traditional steroids like prednisolone can have harmful side effects, this work will be an important step toward finding an alternative treatment.
In this grant-funded trial, Dr. Flanigan will examine the efficacy of spironolactone as compared to prednisolone. Significant deterioration in DMD boys who have never taken steroids occurs after age 7. If spironolactone is as effective as prednisone or prednisolone, the long-term benefits could include avoiding the unwanted side effects of glucocorticoids.
https://doi.org/10.55762/pc.gr.83316
Grantee: DMD - Kevin Flanigan, MD, PhD
Grant type: Human Clinical Trial Grant
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Grant - Winter 2019 - DMD - Justin Boyer, PhD
"Our research will help define the role of satellite cells in muscular dystrophy. The findings from our proposed work will have implications on therapeutics that are currently being tested for Duchenne muscular dystrophy as well as offer new a therapeutic strategy to treat other types of muscular dystrophies."
Justin Boyer, PhD, research fellow at the Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, was awarded an MDA development grant totaling $210,000 over three years to study the role of ERK1/2 signaling in satellite cells of mice models of Duchenne muscular dystrophy (DMD).
Extracellular signal-regulated kinases (ERKs) are proteins that are intricately involved in cell division. Normally, skeletal muscle can repair itself after injury with the help of a specific type of muscle stem cell called a satellite cell (SC). In previous work, Dr. Boyer found that the ERK1/2 protein signaling pathway is an essential mediator of SC survival and function. Silencing this pathway in SCs led to the loss of these cells in skeletal muscle, preventing it from recovering from injury. However, activating the ERK1/2 signaling pathway led to a greater number of SCs.
In this research, Dr. Boyer will further characterize ERK signaling, determine if increasing ERK1/2 activity increases satellite cell numbers, and determine if increased ERK1/2 activity improves muscle regeneration. In doing so, he hopes to further define the role of SCs in muscular dystrophy to better understand how these cells can be targeted for developing therapies to treat this disease.
https://doi.org/10.55762/pc.gr.84536
Grantee: DMD - Justin Boyer, PhD
Grant type: Development Grant
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Grant - Winter 2019 - ALS - Junjie Guo, PhD
"The pathophysiological mechanisms underlying ALS and other neuromuscular diseases are still poorly understood. Only through systematic and mechanistic investigations of disease-relevant pathways can more novel therapeutic targets be discovered. More diverse therapeutic strategies will most likely accelerate the development of treatments."
Junjie Guo, PhD, assistant professor of Neuroscience at Yale University, was awarded an MDA research grant totaling $297,678 over three years to learn more about the process by which RNA from the C9ORF72 gene mutation in amyotrophic lateral sclerosis (ALS) forms complexes with proteins inside the cell and whether specific complexes are detrimental to the health of the motor neuron.
Although most cases of ALS are sporadic, meaning there is no family history of the disease, about 10 percent of cases are familial, meaning the disease runs in the family. Recently, it was discovered that a mutation in the C9ORF72 gene where one segment of the gene is repeated too many times — also known as a repeat expansion — is the most common cause of the familial form of ALS (this form is referred to as C9-ALS) and is found in some sporadic cases as well. It’s uncertain, however, if the disease is caused by reduced levels of normal C9ORF72 protein and/or by toxic RNA and proteins manufactured using instructions from the extra DNA.
Defects in cellular RNA metabolism have been shown to play important roles in a variety of sporadic and familial neuromuscular diseases, including familial ALS. In C9-ALS, RNA from the repeat expansion forms RNA foci (clump-like structures) inside the cell. Previous studies have shown that these RNA foci can alter the function of RNA-binding proteins, thereby affecting the function of cells. In this project, Dr. Guo will study how RNA foci are formed, what factors regulate their formation, and how these foci affect RNA metabolism in a C9-ALS motor neuron model. He aims to better understand the molecular mechanisms and pathophysiological roles of RNA foci in not only ALS but also other neuromuscular diseases associated with repeat expansions.
https://doi.org/10.55762/pc.gr.84550
Grantee: ALS - Junjie Guo, PhD
Grant type: Research Grant
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Grant - Winter 2019 - ALS - Jonathan Glass, MD
"Research into ALS cannot move forward without the participation of patients, who provide the needed clinical information, biosamples, and involvement in clinical trials. Our NEALS organization is the largest academic organization focused on promoting clinical trials in ALS and educating both investigators and patients/families on the science of clinical trials."
Jonathan Glass, MD, professor of Neurology and Pathology at Emory University in Atlanta and director of the Emory ALS Center, was awarded an MDA research infrastructure grant totaling $151,592 over three years to further develop the member services and activities of the Northeast ALS (NEALS) Consortium for the amyotrophic lateral sclerosis (ALS) research community. It builds upon a previous grant awarded to Dr. Glass from 2015 to 2018 for the development and support of the consortium.
The NEALS Consortium is an international organization of 125 research sites that collaborate to support and conduct clinical research in ALS and other motor neuron diseases. The mission of the NEALS Consortium is to translate scientific advances as rapidly as possible into new treatments for people with ALS and motor neuron disease.
This grant will help support the NEALS Consortium’s biorepository, which contains tissues and fluids that are widely used by the community — including MDA-funded researchers — to advance ALS research. The grant will also support the annual NEALS Consortium meeting, which is an opportunity for the sites to come together to share advances and receive training.
Grantee: ALS - Jonathan Glass, MD
Grant type: Infrastructure Grant
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Grant - Winter 2019 - ALS - John Landers, PhD
"I hope that we will identify several genes that, when inactivated, will lead to a beneficial effect in several models of ALS. Identifying such genes will progress several areas of research and the development of therapeutics."
John Landers, PhD, associate professor of Neurology at the University of Massachusetts Medical School, was awarded an MDA research grant totaling $300,000 over three years to identify novel therapeutic targets for both familial and sporadic amyotrophic lateral sclerosis (ALS) using an unbiased screening approach across the entire genome.
Although most cases of ALS are sporadic, meaning there is no family history of the disease, about 10 percent of cases are familial, meaning the disease runs in the family. To date, more than 40 genes have been identified to cause familial ALS; some of them also have been found in sporadic ALS patients. Still, there is no definitive genetic root for 90 percent of ALS cases.
Over the past 15 years, Dr. Landers’ lab has focused on identifying genes associated with ALS. Recently, he has transitioned to novel approaches for drug target discovery. In this research, he will use RNAi screens — RNAi, or RNA interference, uses RNA molecules to bind to and inactivate a gene — to discover novel drug targets for ALS. In these genome-wide RNAi screens, he hopes to discover genes that, when repressed or inactivated, may lead to an increased survival of ALS neurons. His lab previously screened approximately 200 of the 20,000 genes in the genome and identified a single gene that, when inactivated, yielded a beneficial effect on various neuronal cell cultures harboring a mutant ALS gene. In this study, he will screen all 20,000 genes to identify other additional genes that affect ALS motor neuron survival and then follow up on targets with validation studies in mice.
https://doi.org/10.55762/pc.gr.84554
Grantee: ALS - John Landers, PhD
Grant type: Research Grant
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Grant - Winter 2019 - FSHD - Jeffrey Miller, PhD
"We will attempt to identify drugs that prevent DUX4-induced changes in mRNA handling proteins and then determine, in model systems, if such pharmaceutical treatments could lessen loss of muscle function."
Jeffrey Miller, PhD, professor of Neurology at Boston University School of Medicine, was awarded an MDA research grant totaling $300,000 over three years to study the role of aberrant expression of double homeobox 4 protein (DUX4), the protein known to cause facioscapulohumeral muscular dystrophy (FSHD).
FSHD causes progressive degeneration of muscles, including muscles of the face, shoulder blades, and upper arms. FSHD is caused by aberrant expression of DUX4, which disrupts RNA and protein homeostasis and causes cell death. Dr. Miller previously found that DUX4 induces aggregation of TDP-43 and FUS, two proteins that are notably also aggregated in amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD).
In this study, Dr. Miller will identify mechanisms by which the presence of DUX4 changes the splicing of genes regulated by TDP-43. In addition, he will determine to what extent clumping of TDP-43 and FUS explain the appearance of FSHD characteristics in cells and how aggregation induced by DUX4 disrupts RNA homeostasis and ultimately leads to cell death. Finally, he will test drugs in cell culture models to identify targets that prevent these DUX4-induced changes and lessen loss of muscle function.
https://doi.org/10.55762/pc.gr.84559
Grantee: FSHD - Jeffrey Miller, PhD
Grant type: Research Grant
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Grant - Winter 2019 - Mitochondrial Myopathy/ALS - Giovanni Manfredi, MD, PhD
"CHCHD10 mutations are relatively rare causes of neuromuscular disease, but the disease mechanisms and the therapeutic approaches that can emerge from this work could be extended to a diverse group of neuromuscular diseases caused by mitochondrial dysfunction."
Giovanni Manfredi, MD, PhD, professor of Neuroscience, Mitochondria, and Neurodegeneration at Weill Cornell Medical College, was awarded an MDA research grant totaling $300,000 over three years to use a novel mouse model to study CHCHD10 protein mitochondrial diseases.
Mitochondrial are tiny energy factories found inside almost all our cells and are necessary for normal function. Mutations in the CHCHD10 gene, which codes for a mitochondrial protein, can cause multi-systemic mitochondrial diseases characterized by myopathy as well as motor neuron diseases such as amyotrophic lateral sclerosis (ALS) and dementia. In previous MDA-funded work, Dr. Manfredi created a mouse model of CHCHD10 mutations to discover that mitochondrial CHCHD10 protein accumulates and clumps together with other proteins, ultimately resulting in degeneration of the heart and muscles.
In this research, Dr. Manfredi will investigate the specific organs and tissues involved in this disease, which may lead to insights about how to design rational therapies. Specifically, he will study the molecular mechanisms of mitochondrial mutations, determine if and how the nerves and brain are involved, and identify metabolic biomarkers that might help track prognosis of the disease.
https://doi.org/10.55762/pc.gr.84556
Grantee: Mitochondrial Myopathy/ALS - Giovanni Manfredi, MD, PhD
Grant type: Research Grant
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Grant - Winter 2019 - DMD - Foteini Mourkioti, PhD
"Knowledge gained from this MDA funded studies will reveal new mechanisms of cardiac dystrophy, providing fresh strategies for therapeutics to prevent or diminish the destructive cardiac processes in DMD patients."
Foteini Mourkioti, PhD, assistant professor of Orthopedic Surgery at the Perelman School of Medicine, University of Pennsylvania, was awarded an MDA research grant totaling $300,000 over three years to study the relationship between telomere shortening and dilated cardiomyopathy (DCM) in Duchenne muscular dystrophy (DMD) mice models.
Patients with DMD typically have cardiac complications, and heart failure is the major cause of death in DMD. Telomeres are sequences at the end of chromosomes that protect them from breaking down, similar to the plastic coating at the end of a shoelace. It has been previously shown that telomeric repeat-binding factor 2 protein (TRF2), which binds and protects chromosomes, is expressed less in people with dilated cardiomyopathy and in mice with DCM due to DMD.
In this work, Dr. Mourkioti will look at how oxidative stress causes DNA damage and telomere shortening. She will investigate a previously unknown mechanism in cardiac dystrophy and will determine if telomeric proteins in the dystrophic heart have other additional functions. Specifically, to determine whether loss of TRF2 is driving cardiomyopathy in DMD, Dr. Mourkioti will quantify the DNA damage in patient cardiomyocytes and then determine whether loss of TRF2 negatively impacts cardiac structure and function in DMD mice.
https://doi.org/10.55762/pc.gr.84560
Grantee: DMD - Foteini Mourkioti, PhD
Grant type: Research Grant
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Grant - Winter 2019 - DMD - Diego Fraidenraich, PhD
"A combination of pharmacological treatment that involves Cx43 peptide mimetics and gene editing in phosphorylation sites may synergistically increase the chances of a cure."
Diego Fraidenraich, PhD, assistant professor of Cell Biology and Molecular Medicine at Rutgers New Jersey Medical School, was awarded an MDA research grant totaling $300,000 over three years to study the relationship between the connexin 43 protein (Cx43) and cardiomyopathy in Duchenne muscular dystrophy (DMD) mice models.
Patients with DMD typically have cardiac complications, and heart failure is the major cause of death in DMD. Dr. Fraidenraich previously found connexin 43, a type of neuromuscular gap junction protein, to be expressed more in the DMD mouse heart, and that removal or inhibition of Cx43 protein could protect stressed DMD mice from arrhythmia, cardiomyopathy, and premature death.
To further investigate Cx43 as an important target for the treatment of DMD cardiomyopathy, Dr. Fraidenraich will use this grant to further characterize the role of Cx43 in mice and in human tissue by examining phosphorylation, expression levels, and effects on cardiac pathology and function. His previous research used engineered mice with a mutant version of Cx43 that mimicked full phosphorylation; in this project he will extend these studies to a more severe mouse model of DMD.
https://doi.org/10.55762/pc.gr.84546
Grantee: DMD - Diego Fraidenraich, PhD
Grant type: Research Grant
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Grant - Winter 2019 - FSHD - Davide Gabellini, PhD
"With our work, we hope to better understand how DUX4 is regulated and how we could control aberrant DUX4 in FSHD for therapeutic purposes."
Davide Gabellini, PhD, head of the Gene Expression and Muscular Dystrophy Unit at IRCCS Ospedale San Raffaele in Milan, Italy, was awarded an MDA research grant totaling $297,738 over three years to study how specific factors decrease double homeobox 4 protein (DUX4), the protein known to cause facioscapulohumeral muscular dystrophy (FSHD).
FSHD leads to progressive degeneration of muscles, with the most pronounced effects appearing in muscles of the face, shoulder blades, and upper arms. FSHD is caused by abnormal expression of DUX4, which causes toxicity and muscle cell death. Using a whole-genome approach, Dr. Gabellini previously identified one factor as an inhibitor of DUX4. This protein directly binds to DUX4, blocking its ability to activate certain genes that eventually cause cell death.
In this study, Dr. Gabellini aims to clarify the DUX4 biological pathway and the mechanism by which DUX4 causes cell death. Specifically, he will identify the minimal binding domain needed for the identified factor to inhibit DUX4 and determine if its overexpression can prevent FSHD mice and patient cells from dying. Interestingly, mutations in this protein’s gene are associated with familial amyotrophic lateral sclerosis (ALS), so Dr. Gabellini will also assess the impact of specific mutations found in ALS on their ability to inhibit DUX4.
Grantee: FSHD - Davide Gabellini, PhD
Grant type: Research Grant
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Grant - Winter 2019 - ALS - Csaba Konrad, PhD
"We believe finding biomarkers that stratify sporadic ALS patients into subgroups with shared cellular pathology may be the key to improving clinical trial design."
Csaba Konrad, PhD, postdoctoral associate in Neuroscience at Weill Cornell Medical College, was awarded an MDA development grant totaling $210,000 over three years to utilize a large bank of skin cells derived from sporadic amyotrophic lateral sclerosis (ALS) patients to determine if the cells can be clustered into groups based on changes in size and shape. He hopes to use these models to improve ALS patient stratification in clinical trials.
Developing drugs to treat ALS has proven difficult as there are many causes of the disease, resulting in a highly diverse patient population and a dearth of biomarkers. Biomarkers can be used for predicting disease progression and response to therapy, for early detection and accurate diagnosis, and for patient stratification in clinical trials — making biomarker discovery for ALS of high priority.
In previous work, Dr. Konrad showed that skin fibroblast cells are affected by the some of the same pathological changes as motor neurons. In this work, he will use his large bank of ALS patient-derived skin fibroblast cell lines to study differences in morphological features of these cells under stress. By using machine learning techniques, he will build models based on patterns of features that can be used to distinguish between healthy and ALS cells, models to predict clinical characteristics of the disease, and models to define subgroups of ALS patient cells that share similar abnormal features and cellular pathology.
https://doi.org/10.55762/pc.gr.84538
Grantee: ALS - Csaba Konrad, PhD
Grant type: Development Grant
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Grant - Winter 2019 - CMT - Charles Abrams, MD, PhD
"Unraveling the cause of a human disease requires having appropriate animal models for the disease being studied. This proposal will characterize models for CMT1X on the molecular level and use them to initiate studies that will shed light on the causes of this disorder."
Charles Abrams, MD, PhD, professor of Neurology at the University of Illinois, Chicago, was awarded an MDA research grant totaling $300,000 over three years to better understand how mutations in the connexin 32 gene (Cx32) lead to CMT1X, a form of Charcot-Marie-Tooth disease (CMT).
Mutations in the gene coding for the gap junction beta-1 protein (GJB1), also known as connexin 32 protein (Cx32), are associated with the X-linked form of Charcot-Marie-Tooth disease (CMT1X), which affects approximately 1 in 25,000 people and is the second-most-common form of CMT. Although scientists have known about these mutations for more than 25 years, information is still lacking about how they cause disease. In the case of CMT1X, animal models are inadequate — almost all studies have used the Cx32 gene knockout mouse, a loss-of-function model that may not accurately represent the full spectrum of the variety of mutations in Cx32 that can cause CMT1X.
This work will use a technique called RNA-Seq to characterize a variety of different CMT1X mouse models at the level of transcription (RNA), and it will then utilize this information for studies into the causes of this disease. Dr. Abrams will use these different knockout and mutant models to determine how gene expression in Schwann cells is affected by mutations, and how this change in gene expression leads to axonal death. Schwann cells are very important in that they generate the insulating myelin sheath around peripheral nerves. If successful, the project could provide insights into how genetic defects in supportive Schwann cells cause degeneration of the axons in CMT as well as identify which CMT1X patients may benefit from gene-replacement therapies under development.
https://doi.org/10.55762/pc.gr.84541
Grantee: CMT - Charles Abrams, MD, PhD
Grant type: Research Grant
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Grant - Winter 2019 - DMD - Chad Heatwole, MD
"At the completion of our work the DMD research community will have multiple validated outcome measures to aid in therapeutic assessment and encourage therapeutic development for DMD."
Chad Heatwole, MD, associate professor of Neurology at the University of Rochester Medical Center in N.Y., was awarded an MDA Human Clinical Trial Grant totaling $200,000 over two years to develop and validate a health index to be used as a patient-reported outcome (PRO) tool in clinical trials for Duchenne muscular dystrophy (DMD).
While the plethora of varied symptoms of DMD are well known to patients and their doctors, the prevalence and relative importance of the collective set of symptoms has never been found in a large study of DMD patients. The DMD research community lacks a PRO that satisfies all stakeholder groups and is in standard use. The FDA has clearly expressed a desire for such data, so it is critical that the field arrive at a consensus around a validated tool. Dr. Heatwole has previously developed and validated more than 30 disease-specific instruments currently being used in academic and government organizations and pharmaceutical companies around the world.
In this work, Dr. Heatwole will develop and validate PRO measures for DMD clinical trials. He will use patient interviews and a large cross-sectional study to identify the symptoms that are most important to DMD patients. Next, he will develop patient-centered, disease-specific outcome measures for DMD clinical trials using FDA guidelines, to be known as the DMD Health Indices. Finally, he will optimize DMD Health Indices using patient interviews and group testing, among others.
https://doi.org/10.55762/pc.gr.83904
Grantee: DMD - Chad Heatwole, MD
Grant type: Human Clinical Trial Grant
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Grant - Winter 2019 - Congenital & Other Myopathies – Alan Beggs, PhD
Alan Beggs, PhD, professor of Pediatrics at Harvard Medical School and director of the Manton Center for Orphan Disease Research at Children’s Hospital Boston, has been awarded an MDA research grant totaling $300,000 over three years to continue his previous research on the molecular genetics of congenital myopathies.
Congenital myopathies are a diverse group of inherited neuromuscular conditions caused by defects in skeletal muscle and include central core disease (CCD) and other core myopathies, nemaline myopathy, myotubular myopathy (MTM) and other centronuclear myopathies (CNMs), congenital myopathies with fiber-type disproportion (CFTDs), and others (some of these have not yet been identified). In previous MDA-funded work, Dr. Beggs built an extensive data registry and repository of samples from patients and their families. His screening for congenital myopathy-causing mutations in zebrafish led to the discovery of mutations in several genes that may be related to human neuromuscular diseases. His further analyses determined the nature of these mutations, their relationships to the muscle defects seen in zebrafish, and their relationships to the same genes in humans with analogous muscle findings.
In this new project, Dr. Beggs will use whole genome sequencing methods to discover the disease genes and genetic mutations that cause congenital myopathy in patients and families where the underlying cause has not yet been identified. Then, to better understand the biological pathways that lead to disease and search for effective therapies, Dr. Beggs will develop animal models with these mutations, which he will be able to use in validation studies (to test if the mutation actually causes the disease) and screening assays (to test small molecule libraries to identify new drugs to treat these conditions).
https://doi.org/10.55762/pc.gr.84542
Grantee: Congenital & Other Myopathies – Alan Beggs, PhD
Grant type: Research Grant
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Grant - Winter 2019 - Distal Myopathy - Aikaterini Kontrogianni-Konstantopoulos, PhD
“Although mutations in MyBP-C1 have been previously linked to severe and lethal forms of distal arthrogryposis, prior to our studies there was no evidence for causal association of MyBP-C1 mutations to myopathy. Continuing funding research in this area will therefore identify additional myopathic genes that have been potentially overlooked and accurately identify new forms of myopathies.”
Aikaterini Kontrogianni-Konstantopoulos, PhD, professor of Biochemistry and Molecular Biology at the University of Maryland School of Medicine, was awarded an MDA research grant totaling $300,000 over three years to investigate a novel form of myopathy associated with mutations in the myosin binding protein-C1 gene (MyBP-C1) using in vitro (in a petri dish) experiments and mice models.
Myosin binding protein-C is part of a family of proteins that regulates muscles’ ability to contract. Mutations in the genes for the cardiac and slow skeletal isoforms have been found to cause cardiac and neuromuscular disease. MyBP-C1 codes for myosin-binding protein C, slow-type, which is expressed in slow skeletal muscle and has very recently been shown to be associated with a new form of early-onset myopathy with muscle weakness, body deformities, and tremor.
Using well-developed in vitro experiments and a preclinical animal model carrying the mutation, Dr. Kontrogianni-Konstantopoulos hopes to determine what impact this mutation has on the biochemical and biophysical properties of MyBP-C1 protein and the molecular and cellular alterations underlying the development of this novel myopathy.
https://doi.org/10.55762/pc.gr.84553
Grantee: Distal Myopathy - Aikaterini Kontrogianni-Konstantopoulos, PhD
Grant type: Research Grant
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Grant - Summer 2018 - Myotonic Dystrophy – Eric Wang, PhD
“We are living in an extremely exciting time because of the explosion of technological and conceptual advances, both in the context of basic science as well as therapeutic development. Technologies such as high throughput sequencing, antisense oligonucleotides, gene therapy, and small molecule targeting of RNA are transforming the NMD landscape. Several drugs have been recently approved for NMDs and will undoubtedly pave the way for treatments for other NMDs.”
Eric Wang, assistant professor of Molecular Genetics & Microbiology at the University of Florida’s College of Medicine in Gainesville, was awarded an MDA Research Grant totaling $300,000 over 3 years to study the mechanisms of central nervous system (CNS) dysfunction in myotonic dystrophy.
Myotonic dystrophy is a neuromuscular disease with significant muscle, cardiac, and CNS symptoms. A significant amount of research on the skeletal muscle aspects of the disease has enabled clinical trials aimed at addressing muscle symptoms. CNS features of the disease can also be extremely debilitating, but the molecular basis is poorly understood. Building a solid foundation to understand molecular pathogenesis in the CNS, along with developing new animal models and therapeutics, are high priorities for this disease.
Dr. Wang and colleagues plan to identify RNA changes in mouse models of DM1, as well as from postmortem brains from DM1 individuals. The team will pattern its efforts after previous successes in identifying drivers of disease in muscle cells.
These studies will pave the way for future therapeutic development by identifying genes and pathways that are perturbed in the DM1 CNS, as well as by defining biomarkers that can be used to monitor therapeutic rescue in response to candidate therapies.
Grantee: Myotonic Dystrophy – Eric Wang, PhD
Grant type: Research Grant
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Grant - Summer 2018 - ALS – Ludo Van Den Bosch, PhD
“Amyotrophic lateral sclerosis (ALS) is a terrible disease, and despite all the research done in the past, patients still die (usually very fast). With our research, we want to contribute to the development of a cure! The proposed strategy can be translated relatively fast into a new therapy as the class of drugs that we are testing have already been tested in patients suffering from other diseases (e.g. cancer).”
Ludo Van Den Bosch, principal investigator at VIB in Leuven, Belgium, was awarded an MDA Research Grant totaling $300,000 over 3 years to study the role of histone deacetylase inhibitors in amyotrophic lateral sclerosis (ALS).
ALS is a neurodegenerative disease caused by the progressive failure of the motor system. Success in clinical translation of treatments for ALS has been poor and patients urgently need new therapeutic approaches.
Both in ALS patients and in mouse models of ALS, the motor axon is the most vulnerable compartment determining weakness and survival of the nerve cell. Histone deacetylase 6 (HDAC6) plays an important role in the regulation of axonal transport. Inhibition of HDAC6 can reverse the axonal transport deficits induced by mutant proteins. Previous work from the Van Den Bosch lab showed that inhibition of HDAC6 has a positive effect on mouse models of Charcot-Marie-Tooth disease (CMT), most likely due to reinnervation of the neuromuscular junctions.
Dr. Van Den Bosch and colleagues plan to inhibit HDAC6 in mouse models of ALS and to investigate the underlying mechanism of potential positive effects. Overall, the aim of this project is to find positive preclinical evidence for the use of HDAC inhibitors to treat ALS.
Grantee: ALS – Ludo Van Den Bosch, PhD
Grant type: Research Grant
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Grant - Summer 2018 - CMT – Vincent Timmerman, PhD
“If we can successfully validate our research hypothesis, reducing the expression of HSPB8 in vivo and decreasing the detrimental effects of the mutant protein, we may have found the first-ever treatment for dHMN patients having HSPB8 mutations. To reach this objective, we will focus on already-approved compounds and anti-sense oligonucleotides (ASOs).”
Vincent Timmerman, group leader at the University of Antwerp in Belgium, was awarded an MDA Research Grant totaling $300,000 over 3 years to study neuromuscular disease caused by HSPB8 mutations.
Patients with distal hereditary motor neuropathy, a variant of Charcot-Marie-Tooth neuropathy, have a progressive degeneration of their peripheral nerves resulting in muscle weakness and atrophy. Dr. Timmerman and colleagues were the first to report disease-causing mutations in the HSPB8 gene. The small heat shock protein B8 (HSPB8) belongs to the “stress protein family” and is expressed in various tissues and cells. HSPB8 acts as a molecular chaperone by clearing protein aggregates and reducing their toxic accumulation. This protective function has been studied in the context of cancer and neurodegenerative disease.
Building on the discovery, Dr. Timmerman’s team generated a mouse model mimicking the disease by introducing a mutation in the Hspb8 gene (a “knock-in” mouse). In addition, the team also made a model in which they deleted Hspb8 (a “knock-out” mouse), and these animals developed a mild myopathy.
The next step aims to identify therapeutic compounds that can rescue or delay the neurodegeneration observed in the knock-in model, or that can result in a milder phenotype as seen in the knock-out animals. The identified small-molecule compound acting on the expression of HSPB8 could be beneficial to treat patients affected with distal hereditary motor neuropathy and also patients with distal myopathies and related neuromuscular disorders.
Grantee: CMT – Vincent Timmerman, PhD
Grant type: Research Grant
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