TCDB is operated by the Saier Lab Bioinformatics Group
Transporter Information:
Name: solute carrier family 17 (anion/sugar transporter), member 5
Symbol: SLC17A5
TC: 2.A.1.14.10
Locations: 6q14-q15
GenBank: AJ387747
Swiss-Prot: Q9NRA2
Accession Number: NM_012434
Old Name: sialic acid storage disease
PubMed (10581036): Verheijen FW, Verbeek E, Aula N, Beerens CE, Havelaar AC, Joosse M, PeltonenL, Aula P, Galjaard H, van der Spek PJ, Mancini GM. A new gene, encoding an anion transporter, is mutated in sialic acid storagediseases.Nat Genet. 1999 Dec;23(4):462-5. PMID: 10581036 [PubMed - indexed for MEDLINE]

Sialic acid storage diseases (SASD, MIM 269920) are autosomal recessive neurodegenerative disorders that may present as a severe infantile form (ISSD) or a slowly progressive adult form, which is prevalent in Finland (Salla disease). The main symptoms are hypotonia, cerebellar ataxia and mental retardation; visceromegaly and coarse features are also present in infantile cases. Progressive cerebellar atrophy and dysmyelination have been documented by magnetic resonance imaging (ref. 4). Enlarged lysosomes are seen on electron microscopic studies and patients excrete large amounts of free sialic acid in urine. A H+/anionic sugar symporter mechanism for sialic acid and glucuronic acid is impaired in lysosomal membranes from Salla and ISSD patients. The locus for Salla disease was assigned to a region of approximately 200 kb on chromosome 6q14-q15 in a linkage study using Finnish families. Salla disease and ISSD were further shown to be allelic disorders. A physical map with P1 and PAC clones was constructed to cover the 200-kb area flanked by the loci D6S280 and D6S1622, providing the basis for precise physical positioning of the gene. Here we describe a new gene, SLC17A5 (also known as AST), encoding a protein (sialin) with a predicted transport function that belongs to a family of anion/cation symporters (ACS). We found a homozygous SLC17A5 mutation (R39C) in five Finnish patients with Salla disease and six different SLC17A5 mutations in six ISSD patients of different ethnic origins. Our observations suggest that mutations in SLC17A5 are the primary cause of lysosomal sialic acid storage diseases.

PubMed (8198127): Haataja L, Schleutker J, Laine AP, Renlund M, Savontaus ML, Dib C,Weissenbach J, Peltonen L, Aula P. The genetic locus for free sialic acid storage disease maps to the long arm ofchromosome 6.Am J Hum Genet. 1994 Jun;54(6):1042-9. PMID: 8198127 [PubMed - indexed for MEDLINE]

Salla disease (SD), or adult-type free sialic acid storage disease, is an autosomal recessive lysosomal storage disorder characterized by impaired transport of free sialic acid across the lysosomal membrane and severe psychomotor retardation. Random linkage analysis of a sample of 27 Finnish families allowed us to localize the SD locus to the long arm of chromosome 6. The highest lod score of 8.95 was obtained with a microsatellite marker of locus D6S286 at theta = .00. Evidence for linkage disequilibrium was observed between the SD locus and the alleles of three closely linked markers, suggesting that the length of the critical region for the SD locus is in the order of 190 kb.

>gnl|TC-DB|Q9NRA2 2.A.1.14.10 Sialin