Medically reviewed by Benjamin Seth Martinez | MD, Statpearls - Director of Clinical Content on August 28th, 2023.
Lysosomal storage disorders are a group of more than 50 rare genetic diseases that affect the lysosome, a structure in your cells responsible for breaking down and recycling substances such as proteins, carbohydrates, and old cell parts. When a person has a lysosomal storage disorder, they are missing important enzymes that help the lysosome function properly. This leads to a buildup of toxic substances in cells, which can damage cells and organs in the body.
Some of the most common lysosomal storage disorders include:
Fabry disease
Gaucher disease
Krabbe disease
Metachromatic leukodystrophy (MLD)
Mucopolysaccharidosis (MPS)
Niemann-Pick disease
Pompe disease
Tay-Sachs disease
Each disorder affects a different enzyme and has its own set of symptoms, which can vary in severity and onset.
Symptoms of lysosomal storage disorders depend on the specific enzyme that is missing and the cells and organs affected. Some common symptoms may include:
Enlarged organs (liver, spleen, heart)
Bone and joint problems
Neurological issues (seizures, vision and hearing loss, muscle weakness)
Developmental delays
Respiratory problems
Most lysosomal storage disorders are inherited, meaning they are passed down from parents to their children. A child usually needs to inherit the faulty gene from both parents to develop the disorder. If a child inherits the gene from only one parent, they will be a carrier but won't show symptoms.
Lysosomal storage disorders can be diagnosed through prenatal testing or through blood tests that look for the missing enzyme. Other diagnostic tests may include:
MRI scans to create detailed images of the brain
Biopsies to examine tissue samples for signs of the disease
Early diagnosis is crucial for improving outcomes and slowing disease progression.
While there is no cure for lysosomal storage disorders, several treatments can help manage symptoms and slow disease progression:
Enzyme replacement therapy: Delivering the missing enzyme through an IV
Substrate reduction therapy: Reducing the substance that is building up in cells
Stem cell transplant: Using donated cells to help the body produce the missing enzyme
Other treatments to manage symptoms may include medication, surgery, physical therapy, and dialysis.
If you suspect that you or your child may have a lysosomal storage disorder, it's essential to speak with a healthcare provider who can guide you through the diagnostic and treatment process. For more information on these rare genetic diseases, visit reputable sources such as the National Human Genome Research Institute, National Organization for Rare Disorders, and National Institute of Neurological Disorders and Stroke.
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