Myonexus Therapeutics

Developing Pioneering Treatments for Limb Girdle Muscular Dystrophies

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Myonexus Therapeutics is a clinical stage gene therapy company developing first ever treatments for Limb-girdle muscular dystrophy (LGMD) types 2D, 2B, 2E, 2L, and 2C based on research at Nationwide Children’s Hospital, a leader in muscular dystrophy gene therapy discovery and translational research.


Limb-girdle muscular dystrophy (LGMD) is a group of monogenic diseases that cause weakness and wasting of the muscles in the arms and legs. The muscles most affected are those closest to the body (proximal muscles), specifically the muscles of the shoulders, upper arms, pelvic area, thighs, and, occasionally, the heart. Signs and symptoms often present in adolescence and generally worsen with time. As the condition progresses, people with LGMD may eventually require wheelchair assistance. In more severe cases, premature death can occur as early as 30 years of age.
Muscle wasting may cause changes in posture or in the appearance of the shoulder, back, and arm. In particular, weak shoulder muscles tend to make the shoulder blades (scapulae) "stick out" from the back, a sign known as scapular winging. Affected individuals may also have an abnormally curved lower back (lordosis) or a spine that curves to the side (scoliosis). Some develop joint stiffness (contractures) that can restrict movement in their hips, knees, ankles, or elbows. Overgrowth (hypertrophy) of the calf muscles occurs in some people with LGMD.
Weakening of the heart muscle (cardiomyopathy) occurs in some forms of LGMD. Some affected individuals experience mild to severe breathing problems related to the weakness of muscles needed for breathing. In some cases, the breathing problems are severe enough that affected individuals need to use a machine to help them breathe (mechanical ventilation).
Affecting males and females globally, each LGMD subtype results from a single mutation in genes that affect proteins necessary for normal muscle function. The NIH estimates total LGMD prevalence between 1 in 14,500 to 1 in 123,000 individuals, affecting ~16,000 patients combined in the US. The prevalence of each LGMD subtype ranges from 2 – 10 per million, or 1,000 – 10,000 patients in the US and EU combined.
There are currently no cures or effective therapies for LGMDs.

Clinical Stage LGMD Gene Therapy Pipeline

Intended as one-time, systemic administrations of corrective gene delivered using rh.74 AAV

Compelling Lineage

Leveraging the same gene therapy discovery research, preclinical R&D, GMP manufacturing, and clinical trial capabilities that successfully supported the commercial development of several gene therapy and neuromuscular disease focused companies, Nationwide Children’s Hospital (NCH) researchers have built a robust pipeline of gene therapy candidates for LGMD types 2D (Phase 1 IM study completed with Phase 1 isolated limb perfusion study ongoing), 2B (Phase 1 IM study ongoing), 2E (IV IND approved with a planned trial start date of November 2017), 2L (preclinical), and 2C (preclinical).

Myonexus Therapeutics is developing first ever gene treatments for Limb-girdle muscular dystrophy (LGMD) types 2D, 2B, 2E, 2L, and 2C.