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The disorders involving primarily the cerebellar parenchyma have been classified into six forms. In cerebelloparenchymal disorder III, cerebellar ataxia is congenital (non-progressive) and characterized by cerebellar symptoms such as incoordination of gait often associated with poor coordination of hands, speech and eye movements. The other features are congenital mental retardation and hypotonia, in addition to other neurological and non-neurological features. MRI or CT scan show marked atrophy of the vermis and hemispheres. A severe loss of granule cells with heterotopic Purkinje cells is observed. The mode of inheritance in the few reported families is autosomal recessive. In one family, cerebellar ataxia was associated to albinism.: In a large inbred Lebanese family the disease locus was assigned to a 12.1-cM interval on chromosome 9q34-qter between markers D9S67 and D9S312. The primary biochemical defect remains unknown. Up to now, the only treatment has consisted in early interventional therapies including intensive speech therapy and adequate stimulation and/or training.
Features include always present findings: Gaze-evoked nystagmus, Dysmetria, Gait ataxia, and Delayed ability to walk and others; and very common findings: Intellectual disability and Delayed speech and language development. 26 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 13 | Gait ataxia, Ataxia, Unsteady gait |
Eyes | 3 | Gaze-evoked nystagmus, Saccadic smooth pursuit interruptions, Nystagmus |
Muscles | 3 | Low muscle tone (hypotonia), Generalized hypotonia, Cerebellar vermis atrophy |
Growth and development | 1 | Short stature |
Arms and legs | 1 | Limb ataxia |
Age of onset: at birth.
PMPCA function has not been fully characterized.
Autosomal recessive spinocerebellar ataxia 2 is associated with mutations in the PMPCA gene on chromosome 9.
Genetic testing for PMPCA is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for autosomal recessive spinocerebellar ataxia 2 has been reported in the published literature.
Phenotype severity distribution: 5 always present features, 2 very common features, 1 common feature.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for autosomal recessive spinocerebellar ataxia 2.
91 publications have been identified in PubMed for autosomal recessive spinocerebellar ataxia 2. Research spans Basic Science / Preclinical (36%), Case Report / Case Series (32%), and Epidemiology / Natural History (10%).
Research Type | Count | % of Total |
|---|---|---|
Laboratory research | 33 | 36% |
Patient case studies | 29 | 32% |
Disease patterns and progression | 9 | 10% |
Research summaries | 8 | 9% |
Clinical study results | 7 | 8% |
Testing and diagnosis research | 4 | 4% |
New treatment approaches | 1 | 1% |
Brown BN (2026). [PMID: 42160398](https://pubmed.ncbi.nlm.nih.gov/42160398/). *PLoS Genet*. [Basic Science / Preclinical]
Fortin J (2026). [PMID: 41669957](https://pubmed.ncbi.nlm.nih.gov/41669957/). *Mov Disord*. [Epidemiology / Natural History]
Zheng KM (2026). [PMID: 41851873](https://pubmed.ncbi.nlm.nih.gov/41851873/). *BMC Neurol*. [Case Report / Case Series]
Yunoki T (2026). [PMID: 40467513](https://pubmed.ncbi.nlm.nih.gov/40467513/). *Internal medicine (Tokyo, Japan)*. [Case Report / Case Series]
Misceo D (2026). [PMID: 42074495](https://pubmed.ncbi.nlm.nih.gov/42074495/). *Genes (Basel)*. [Case Report / Case Series]
Martineau L (2026). [PMID: 41529449](https://pubmed.ncbi.nlm.nih.gov/41529449/). *Stem cell research*. [Case Report / Case Series]
Yeow D (2026). [PMID: 41353788](https://pubmed.ncbi.nlm.nih.gov/41353788/). *Annals of clinical and translational neurology*. [Case Report / Case Series]
Adarsha N (2026). [PMID: 41673450](https://pubmed.ncbi.nlm.nih.gov/41673450/). *Journal of human genetics*. [Basic Science / Preclinical]
Chrysanthou A (2026). [PMID: 42129323](https://pubmed.ncbi.nlm.nih.gov/42129323/). *Sci Rep*. [Basic Science / Preclinical]
Erdmann H (2026). [PMID: 40898875](https://pubmed.ncbi.nlm.nih.gov/40898875/). *Brain : a journal of neurology*. [Review / Meta-Analysis]
Data assembled from 6 of 12 sources · Last updated Sep 20, 2026, 5:39 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center