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LAMP2 gene

Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

LAMP2 gene

The LAMP2 gene encodes a protein essential for lysosomal function and cellular recycling, with mutations leading to severe muscle and heart conditions.

Overview

The LAMP2 gene provides instructions for making a protein called lysosome-associated membrane glycoprotein 2 (LAMP-2). This protein is located in the membrane of lysosomes, which are cellular compartments responsible for digesting and recycling materials. The LAMP-2 protein facilitates the transport of cellular materials or digestive enzymes into the lysosome.

There are three isoforms of the protein—LAMP-2A, LAMP-2B, and LAMP-2C—which have distinct functions and tissue distributions:

  • LAMP-2A: Transports specific proteins into the lysosome for breakdown.
  • LAMP-2B: Facilitates the fusion of autophagic vacuoles (autophagosomes) with lysosomes, allowing cellular material to be recycled. This is the primary isoform found in heart and skeletal muscles.
  • LAMP-2C: Transports DNA and RNA building blocks (nucleotides) into the lysosome for degradation.

Health Conditions Related to Genetic Changes

Danon disease

More than 100 variants in the LAMP2 gene cause Danon disease, a condition characterized by:

  • Weakening of the heart muscle (cardiomyopathy)
  • Weakening of skeletal muscles (myopathy)
  • Intellectual disabilities

These variants typically lead to little or no functional LAMP-2 protein. In the absence of this protein, the fusion between autophagic vacuoles and lysosomes is delayed, causing an accumulation of vacuoles in heart and skeletal muscle cells. This buildup is believed to cause the cell breakdown and muscle weakness observed in patients.

Hypertrophic cardiomyopathy

Some individuals with LAMP2 variants develop hypertrophic cardiomyopathy—a thickening of the heart muscle—without other symptoms of Danon disease. This often affects the left ventricle and may be accompanied by cardiac preexcitation, an abnormality in the electrical signals controlling the heartbeat. LAMP2 variants are thought to account for 1 to 4 percent of all cases of hypertrophic cardiomyopathy.

Genomic Location

The LAMP2 gene is found on the X chromosome.

Frequently Asked Questions

LAMP2 encodes a protein that helps fuse autophagosomes with lysosomes, allowing damaged cellular components to be degraded. Without functional LAMP2, these autophagic vacuoles accumulate in heart and skeletal muscle cells, causing cellular stress, impaired energy production, and eventual muscle fiber breakdown, which manifests as weakness and cardiomyopathy.
Patients should undergo regular echocardiograms and ECGs every 3–6 months to track ventricular size, function, and conduction abnormalities. Holter monitoring may be advised if arrhythmias are suspected. Early detection of hypertrophic changes or pre‑excitation can guide timely interventions such as medication or device implantation.
Current options include standard heart failure treatments (ACE inhibitors, beta‑blockers, diuretics) and, in advanced cases, heart transplantation. Emerging research explores mTOR inhibitors, autophagy‑enhancing drugs, and gene‑replacement strategies, but these remain investigational. Patients should be enrolled in clinical trials when available.
Yes. Genetic testing panels for cardiomyopathy often include LAMP2. If a pathogenic variant is found, cascade testing of relatives can identify at‑risk individuals, allowing early surveillance and management. Genetic counseling is recommended to interpret results and discuss reproductive options.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.