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Each column keeps its native condition scope. Initial features are displayed alphabetically, not ranked by clinical importance. Counts remain separate, and an empty cell does not mean a feature cannot occur.

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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"

Variants (also known as mutations) in the ASAH1 gene cause Farber lipogranulomatosis. The ASAH1 gene provides instructions for making an enzyme called acid ceramidase. This enzyme is found in cell compartments called lysosomes, which digest and recycle materials. Acid ceramidase breaks down fats called ceramides into a fat called sphingosine and a fatty acid. These two breakdown products are recycled to create new ceramides for the body to use. Ceramides have several roles within cells. For example, they are a component of a fatty substance called myelin that insulates and protects nerve cells. Ceramides are also part of the outer membrane surrounding cells, where they sense stress and other external factors and help the cells react.

Variants in the ASAH1 gene lead to severe reduction in acid ceramidase, typically to below 10 percent of normal. As a result, the enzyme cannot break down ceramides properly and they build up in the lysosomes of various cells, including in the lung, liver, colon, muscles used for movement (skeletal muscles), cartilage, and bone. The buildup of ceramides along with the reduction of its fatty breakdown products in cells likely causes the signs and symptoms of Farber lipogranulomatosis. It is unclear whether the level of acid ceramidase activity is related to the severity of the disorder.

MedlinePlus Genetics: Causes

","key":"forms","title":"What causes Farber lipogranulomatosis?"},{"bodyHtml":"

Three classic signs occur in Farber lipogranulomatosis: a hoarse voice or a weak cry, small lumps of fat under the skin and in other tissues (lipogranulomas), and swollen and painful joints. Signs and symptoms typically first develop in infancy.

In addition to the classic signs, Farber lipogranulomatosis often affects multiple body systems. Affected individuals can have developmental delay, behavioral problems, or seizures. In severe cases, people experience progressive decline in brain and spinal cord (central nervous system) function, a buildup of fluid in the brain (hydrocephalus), loss (atrophy) of brain tissue, paralysis of the arms and legs (quadriplegia), loss of speech, or involuntary muscle jerks (myoclonus).

People with Farber lipogranulomatosis often have enlarged liver, spleen, and immune system tissues due to massive lipid deposits. Lipid deposits may also occur in the eyes and lungs, leading to vision problems and breathing difficulty. Affected individuals may develop thinning of the bones (osteoporosis) that worsens over time.

Because of the severity of the signs and symptoms of the condition, individuals with Farber lipogranulomatosis generally do not survive past childhood.

Source: MedlinePlus Genetics

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