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The official name of this gene is “solute carrier family 17 (acidic sugar transporter), member 5.”
SLC17A5 is the gene's official symbol. The SLC17A5 gene is also known by other names, listed below.
The SLC17A5 gene provides instructions for producing a protein called sialin that is located mainly on the membranes of lysosomes, compartments in the cell that digest and recycle materials. Sialin moves a molecule called free sialic acid, which is produced when certain proteins and fats are broken down, out of the lysosomes to other parts of the cell. Free sialic acid means that the sialic acid is not attached (bound) to other molecules.
Researchers believe that sialin may also have other functions in brain cells, in addition to those associated with the lysosomes, but these additional functions are not well understood.
The SLC17A5 gene belongs to a family of genes called SLC (solute carriers).
A gene family is a group of genes that share important characteristics. Classifying individual genes into families helps researchers describe how genes are related to each other. For more information, see What are gene families? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genefamilies) in the Handbook.
Approximately 20 mutations that cause sialic acid storage disease have been identified in the SLC17A5 gene. Some of these mutations result in sialin that does not function normally; others prevent sialin from being produced. In a few cases, sialin is produced but not routed properly to the lysosomal membrane.
There are three forms of sialic acid storage disease. A particular SLC17A5 mutation, found primarily in people from Finland and Sweden, causes the least severe form of this disorder known as Salla disease. This mutation replaces the protein building block (amino acid) arginine with the amino acid cysteine at position 39 of the sialin protein (written as Arg39Cys or R39C). Other SLC17A5 gene mutations that have more damaging effects on sialin protein function cause the most severe form of the disorder, infantile free sialic acid storage disease. Individuals diagnosed with intermediate severe Salla disease have one copy of the SLC17A5 gene with the Salla disease mutation in each cell, while the second copy of the gene bears a more severe mutation. The severity of signs and symptoms of intermediate severe Salla disease falls between those of Salla disease and infantile free sialic acid storage disease.
SLC17A5 gene mutations that reduce or eliminate sialin activity result in a buildup of free sialic acid in the lysosomes. It is not known how this buildup, or disruption of other possible functions of sialin in the brain, causes the specific signs and symptoms of sialic acid storage disease.
Cytogenetic Location: 6q13
Molecular Location on chromosome 6: base pairs 73,593,378 to 73,654,013
The SLC17A5 gene is located on the long (q) arm of chromosome 6 at position 13.
More precisely, the SLC17A5 gene is located from base pair 73,593,378 to base pair 73,654,013 on chromosome 6.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
You and your healthcare professional may find the following resources about SLC17A5 helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
amino acid ; arginine ; carrier ; cell ; cysteine ; gene ; molecule ; mutation ; protein ; sialic acid ; solute
You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://ghr.nlm.nih.gov/glossary).
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.