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Danon disease

Other Names for this Disease
  • Antopol disease
  • Glycogen storage cardiomyopathy
  • Glycogen storage disease limited to the heart
  • Glycogen storage disease type 2b (formerly)
  • GSD2B (formerly)
More Names
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What are the signs and symptoms of Danon disease?

Danon disease is characterized by cardiomyopathy. Cardiomyopathy causes the heart muscle to enlarge or become thicker and more rigid than normal. This may make the heart less able to pump blood through the body and can cause serious complications, including sudden death. People with danon disease may also manifest with high levels of serum creatine kinase, eye/vision abnormalities, or Wolff-Parkinson-White syndrome.[1][2][3] Wolff-Parkinson-White syndrome is a condition characterized by abnormal electrical pathways in the heart that cause a disruption of the heart's normal rhythm (arrhythmia).

Men with Danon disease tend to develop cardiomyopathy prior to the age of 20,[1] and sometimes in early childhood. Women with Danon disease tend to develop cardiomyopathy later in adulthood,[1] however cases of cardiomyopathy in young girls have been reported in the medical literature.[2][3]  Some women who carry LAMP2 gene mutation never develop any or only very minor symptoms.[1][2][3]

The following additional signs and symptoms are variably present in people with Danon disease:[1][2][3]

Learning and development (primarily reported in males, however there has been at least one report of an affected female)

Mild intellectual ability
Mental retardation
Attention deficit disorder[1]

Skeletal muscle

Exercise intolerance
Muscle weakness

Eye and vision

Peripheral pigmentary retinopathy
Lens changes
Abnormal visual fields

Signs and symptoms of Danon disease can be very similar to those of hypertrophic cardiomyopathy, even though the underlying disease process differs. You can find detailed information on hypertrophic cardiomyopathy, which includes a brief description of Danon disease, by visiting the following link to GeneReviews.

Last updated: 3/19/2010

  1. Yang Z et al. Danon disease as an underrecognized cause of hypertrophic cardiomyopathy in children. Circulation. 2005;
  2. Maron BJ et al. Clinical outcome and phenotypic expression in LAMP2 cardiomyopathy. JAMA. 2009;
  3. Danon disease. Online Mendelian Inheritance in Man. March 19, 2010; Accessed 1/1/2008.