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Available structures
PDB Ortholog search: PDBe RCSB
Aliases ATXN2, ASL13, ATX2, SCA2, TNRC13, ataxin 2
External IDs MGI: 1277223 HomoloGene: 2234 GeneCards: ATXN2
Genetically Related Diseases
kidney disease[1]
RNA expression pattern
PBB GE ATXN2 202622 s at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC) Chr 12: 111.45 – 111.6 Mb Chr 5: 121.71 – 121.82 Mb
PubMed search [2] [3]
View/Edit Human View/Edit Mouse

Ataxin-2 is a protein that in humans is encoded by the ATXN2 gene.[4][5]

Mutations in ATXN2 cause spinocerebellar ataxia type 2 (SCA2). The autosomal dominant cerebellar ataxias (ADCA) are a heterogeneous group of neurodegenerative disorders characterized by progressive degeneration of the cerebellum, brain stem and spinal cord. Clinically, ADCA has been divided into three groups: ADCA types I-III. ADCAI is genetically heterogeneous, with five genetic loci, designated spinocerebellar ataxia (SCA) 1, 2, 3, 4 and 6, being assigned to five different chromosomes. ADCAII, which always presents with retinal degeneration (SCA7), and ADCAIII often referred to as the `pure' cerebellar syndrome (SCA5), are most likely homogeneous disorders. Several SCA genes have been cloned and shown to contain CAG repeats in their coding regions. SCA2 is caused by the expansion of a CAG repeat in the coding region of the ATXN2 gene producing an elongated polyglutamine tract in the corresponding protein. The expanded repeats are variable in size and unstable, usually increasing in size when transmitted to successive generations. The function of the ataxins is not known. This locus has been mapped to chromosome 12, and it has been determined that the disease allele usually contains 34-52 CAG repeats, but can contain as few as 32 or more than 100. Normal alleles usually have 22 or 23 repeats, but can contain up to 31 repeats. A potential transcript variant, missing an internal coding exon, has been described; however, its full-length nature is not certain.[6]

In 2010, work from Aaron Gitler and Nancy Bonini at the University of Pennsylvania discovered that intermediate-size CAG repeat expansions are significantly associated with risk for developing amyotrophic lateral sclerosis (Lou Gehrig's disease).[7]


  1. ^ "Diseases that are genetically associated with ATXN2 view/edit references on wikidata". 
  2. ^ "Human PubMed Reference:". 
  3. ^ "Mouse PubMed Reference:". 
  4. ^ Gispert S, Twells R, Orozco G, Brice A, Weber J, Heredero L, Scheufler K, Riley B, Allotey R, Nothers C, et al. (Sep 1993). "Chromosomal assignment of the second locus for autosomal dominant cerebellar ataxia (SCA2) to chromosome 12q23-24.1". Nat Genet. 4 (3): 295–9. doi:10.1038/ng0793-295. PMID 8358438. 
  5. ^ Margolis RL, Abraham MR, Gatchell SB, Li SH, Kidwai AS, Breschel TS, Stine OC, Callahan C, McInnis MG, Ross CA (Jul 1997). "cDNAs with long CAG trinucleotide repeats from human brain". Hum Genet. 100 (1): 114–22. doi:10.1007/s004390050476. PMID 9225980. 
  6. ^ "Entrez Gene: ATXN2 ataxin 2". 
  7. ^ Elden AC, Kim HJ, Hart MP, Chen-Plotkin AS, Johnson BS, Fang X, Armakola M, Geser F, Greene R, Lu MM, et al. (Aug 2010). "Ataxin-2 intermediate-length polyglutamine expansions are associated with increased risk for ALS". Nature. 466 (7310): 1069–1075. doi:10.1038/nature09320. PMC 2965417Freely accessible. PMID 20740007. 

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