Ataxin 10 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Ataxin-10 is the protein encoded by the ATXN10 gene, located on chromosome 22q13.31. It is associated with spinocerebellar ataxia type 10 (SCA10), a rare autosomal dominant neurodegenerative disorder characterized by progressive cerebellar ataxia, dysarthria, and seizures. Ataxin-10 is expressed ubiquitously in the brain, with particularly high expression in cerebellar Purkinje cells, which are the primary neuronal lost population in SCA10. The protein contains multiple HEAT repeat domains that mediate protein-protein interactions, suggesting it functions as a scaffold or regulatory protein rather than having catalytic activity. [1]
Ataxin-10 is a neuronal protein that plays a critical role in cerebellar function and survival. While its exact physiological function remains incompletely characterized, evidence suggests it acts as a survival factor for Purkinje cells and participates in various cellular processes including signal transduction, mRNA translation regulation, and stress response pathways. SCA10 is unique among spinocerebellar ataxias due to its characteristic pentanucleotide repeat expansion in the ATXN10 gene, which leads to both loss-of-function effects and toxic gain-of-function mechanisms. The disease primarily affects the cerebellum and brainstem, leading to progressive motor impairment, but can also involve extracerebellar features including epilepsy and peripheral neuropathy. [2]
| Property | Value | [3]
|----------|-------| [4]
| Protein Name | Ataxin-10 | [5]
| Gene | ATXN10 |
| UniProt ID | Q9UBB6 |
| Molecular Weight | ~47 kDa (420 amino acids) |
| Subcellular Localization | Cytoplasm, nucleus ( shuttles between compartments) |
| Protein Family | Ataxin family (non-aggregating) |
| Expression | High in cerebellum (Purkinje cells), cerebral cortex, brainstem |
Ataxin-10 has a relatively simple but distinctive structure:
Unlike many other ataxins (such as ataxin-1, ataxin-3, and ataxin-7), ataxin-10 does not form nuclear inclusions in disease, which may reflect different pathogenic mechanisms.
The normal physiological functions of ataxin-10 are still being elucidated, but research has identified several important roles:
SCA10 is a pentanucleotide repeat expansion disorder caused by expansion of an ATTCT repeat in intron 1 of the ATXN10 gene:
The disease results from a combination of toxic gain-of-function and loss-of-function mechanisms:
RNA Toxicity
Repeat-Associated Non-AUG (RAN) Translation
Loss of Function
SCA10 presents with characteristic neurological symptoms:
Currently no disease-modifying treatments exist, but several approaches are under investigation:
The study of Ataxin 10 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.