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History and Perspective of LAMP-2 Deficiency (Danon Disease)
Kazuma Sugie1, Ichizo Nishino2
1Department of Neurology, School of Medicine, Nara Medical University, Nara 634-8521, Japan.
Abstract:
Danon disease, an X-linked dominant vacuolar cardiomyopathy and skeletal myopathy, is caused by a primary deficiency of lysosome-associated membrane protein-2 (LAMP-2). This disease is one of the autophagy-related muscle diseases. Male patients present with the triad of cardiomyopathy, myopathy, and intellectual disability, while female patients present with cardiomyopathy. The disease's leading cause of death is heart failure, and its prognostic factor is cardiomyopathy. Pathologically, the disease is characterized by the appearance of unique autophagic vacuoles with sarcolemmal features (AVSFs). Twenty-six families have been found to have this disease in Japan. It has been over 40 years since the first report of this disease by Danon et al. and over 20 years since the identification of the causative gene, LAMP2, by Nishino et al. Although the pathogenetic mechanism of Danon disease remains unestablished, the first clinical trials using AAV vectors have finally begun in recent years. The development of novel therapies is expected in the future.
Insights
Danon disease, a genetic disorder affecting lysosomes, causes severe heart and muscle problems due to LAMP-2 deficiency. Early research and recent clinical trials offer hope for new treatments for this rare condition.
Area of Science:
- Genetics and Molecular Biology
- Cardiology
- Neurology
Background:
- Danon disease is an X-linked dominant disorder characterized by vacuolar cardiomyopathy and skeletal myopathy.
- It stems from a deficiency in lysosome-associated membrane protein-2 (LAMP-2), classifying it among autophagy-related muscle diseases.
- Male patients exhibit cardiomyopathy, myopathy, and intellectual disability, whereas females primarily present with cardiomyopathy.
Purpose of the Study:
- To summarize the current understanding of Danon disease, including its genetic basis, clinical manifestations, and pathological features.
- To highlight the progression of research, from initial reports to the identification of the causative gene and recent therapeutic advancements.
- To underscore the significance of cardiomyopathy as a prognostic factor and leading cause of mortality.
Main Methods:
- Review of existing literature on Danon disease, including clinical case reports and genetic studies.
- Analysis of pathological findings, specifically the characteristic autophagic vacuoles with sarcolemmal features (AVSFs).
- Examination of epidemiological data, noting the prevalence in specific populations, such as the 26 families identified in Japan.
Main Results:
- Danon disease is caused by LAMP-2 deficiency, leading to progressive cardiac and skeletal muscle dysfunction.
- Pathological hallmarks include unique autophagic vacuoles with sarcolemmal features (AVSFs).
- Despite being known for over 40 years, the precise pathogenetic mechanisms are still under investigation, though recent AAV vector trials have commenced.
Conclusions:
- Danon disease poses a significant threat due to heart failure, with cardiomyopathy being a key prognostic indicator.
- The identification of the LAMP2 gene has been crucial, but further research into pathogenesis is needed.
- The initiation of clinical trials using AAV vectors marks a significant step towards developing novel therapies for Danon disease.
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