Synonyms: GSD due to muscle and heart glycogen synthase deficiency | GSD type 0b | Glycogen storage disease type 0b | Glycogenosis due to muscle and heart glycogen synthase deficiency | Glycogenosis type 0b
Glycogen storage disease due to muscle and heart glycogen synthase deficiency is characterised by muscle and heart glycogen deficiency. It has been described in three siblings (two brothers and their younger sister). The older brother died at 10.5 years of age as a result of sudden cardiac arrest and the younger brother presented with hypertrophic cardiomyopathy abnormal heart rate and blood pressure during exercise and muscle fatigability. The sister showed no symptoms but a lack of glycogen was identified through muscle biopsy. The syndrome is caused by homozygous missense mutations in the gene encoding muscle glycogen synthase.
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version July 2026
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Glycogen storage disease due to muscle and heart glycogen synthase deficiency?
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Advocacy Organizations
Global Liver Institute
To improve the lives of individuals and families impacted by liver disease through promoting innovation, encouraging collaboration, and scaling optimal approaches to help eradicate liver diseases.
Heart of a Giant Foundation
The mission of the HGF is to achieve better health outcomes for heart diseases and related chronic health conditions in our communities and enhance the quality of life through health education, care support, and connection to community resources.
HeartCharged
Ending preventable deaths from undiagnosed heart conditions and sudden cardiac arrest, especially in young people, and providing patient-to-patient support.
Hypertrophic Cardiomyopathy Association
Providing support, advocacy, and education to patients, families, the medical community, and the public about hypertrophic cardiomyopathy and all thick heart muscle disorders, while supporting research and fostering the development of treatments.
Louisiana Metabolic Disorders Coalition
We support, educate, and advocate for patients & families affected by metabolic disorders.
Mississippi Metabolics Foundation
Our mission at Mississippi Metabolics Foundation (MMF) is to advocate, educate, and support families in MS affected by genetic metabolic disorders/inborn errors of metabolism (IEM's). MMF promotes initiatives and further advancements in legislation, education, research, clinical trials, studies, therapies, targeted treatments, and eventual cures for IEM’s and all rare diseases.
RareDNA Foundation
Dedicated to improving outcomes for individuals and families affected by rare DNA heart mutations by advancing awareness, access and action. We increase awareness among medical professionals and the public, provide education and resources on diagnosis and treatment, support scientific research, and advocate for faster diagnostic pathways, giving families the knowledge and care they need.
The Sudden Arrhythmia Death Syndromes (SADS) Foundation
The Sudden Arrhythmia Death Syndromes (SADS) Foundation exists to save the lives and support children, adults, and families affected by genetic heart conditions that predispose them to sudden death due to arrhythmias.
Uganda Alliance of Patients Organization
Supporting patients to access quality, safe and patient-centered healthcare services.
association for glycogen storage disease
The Association for Glycogen Storage Disease (AGSD) is a patient advocacy organization dedicated to protecting and promoting the best interest of all persons affected by the glycogen storage disease. • AGSD is committed to the identification, treatment, and cure of glycogen storage disease through programs of education, advocacy, research, and patient services.
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Clinical Trials
For a list of clinical trials in this disease area, please click here.