Dr. Achal Kumar Srivastava
Neurologist
All India Institute of Medical Sciences (AIIMS), New Delhi
Clinical neurology and movement disorders, including the presentation and long-term course of hereditary ataxias.
Research
SCA12 was identified in 1999. Since then 142 papers have carried it in their title. All of them are listed here, year by year, each linked to its source.
New here? See what all of these papers add up to
142
papers listed
1999–2026
years covered
87
journals and books
282
further related papers
The shape of the field
For two decades after SCA12 was named, a handful of papers appeared each year. Since 2021 that has changed markedly. For a condition this rare, a rising line is the most hopeful thing on this page.
Publications per year from 1999 to 2026, peaking at 16 in 2024. Each column links to that year in the list below.
How understanding developed
The chart shows how much was published. This is the short version of what changed.
1999
SCA12 was described as a distinct form of spinocerebellar ataxia and linked to an expanded CAG repeat in the PPP2R2B gene on chromosome 5. This is what made it possible to identify SCA12 specifically, rather than grouping it with other ataxias.
Holmes et al., Nature Genetics, 19992000s
Reports from Indian centres established that SCA12, while rare worldwide, accounts for a meaningful share of inherited ataxia diagnoses in parts of North India. Much of the clinical description of SCA12 comes from this work.
Srivastava et al., Annals of Neurology, 20012017
A Delhi study described 18 patients with 43–50 repeats — below the 51 then used as the cutoff — whose illness looked like typical SCA12, and proposed 43 as the pathogenic threshold. It is why the grey zone on our explainer page is drawn as a grey zone.
Srivastava et al., Brain, 20172026
Sixty people with SCA12 at AIIMS New Delhi were given extended-release propranolol or a placebo. Propranolol reduced tremor scores and improved quality of life, and was well tolerated. It treats a symptom, not the condition — but it is the first randomised evidence of any kind in SCA12.
Mohapatra et al., Movement Disorders, 2026Today
Cohort studies, cell models grown from patients’ own cells, and now a first trial continue to sharpen the picture of how SCA12 presents, what goes wrong in the cell, and what might help. The library below tracks all of it, year by year.
Start here
A reading path through the library, in the order the field learned things. Each summary is written from the paper’s own abstract, and says only what that abstract says. If you would rather see the whole field at once, what the research adds up to draws it as pictures. New to the condition? Our plain-language guide to SCA12 is the place to start before any of these.
Where it starts
Expansion of a novel CAG trinucleotide repeat in the 5' region of PPP2R2B is associated with SCA12The paper that identified SCA12: an expanded CAG repeat in the 5′ region of the PPP2R2B gene, found in an American family with ataxia.
Why North India
Evidence of a common founder for SCA12 in the Indian populationFound SCA12 in about 16% of dominant ataxia cases at AIIMS, with expanded alleles of 51–69 repeats, and showed the affected Indian families share one ancestral haplotype — a common founder — not shared by the American family, so the expansion arose at least twice.
What might go wrong in the cell
The spinocerebellar ataxia 12 gene product and protein phosphatase 2A regulatory subunit Bbeta2 antagonizes neuronal survival by promoting mitochondrial fissionIn cell models, the SCA12 gene product Bβ2 moved to mitochondria under stress and drove their fragmentation and cell death, while silencing it protected neurons. The origin of the mitochondrial hypothesis for SCA12.
The threshold is questioned
Clinical behaviour of spinocerebellar ataxia type 12 and intermediate length abnormal CAG repeats in PPP2R2BDescribed 18 patients with 43–50 repeats — below the 51 then used as the cutoff — whose clinical picture matched typical SCA12, and proposed 43 as the pathogenic threshold. Also suggested SCA12 may be less geographically restricted than assumed.
What it looks like, in numbers
Clinical, Radiological, and Genetic Profile of Spinocerebellar Ataxia 12: A Hospital-Based Cohort Analysis49 genetically confirmed patients: tremor was the first symptom in 73.5%, average onset 46, 79.6% from the Agarwal community, expanded repeats from 40 to 72, and no correlation between repeat length and age at onset.
The current clinical picture
Spinocerebellar Ataxia Type 12: Spectrums of Movement Disorders and Clinical FeaturesThe 2026 review: tremor, typically action or postural, is usually first and can precede cerebellar signs by years; dystonia, parkinsonism and psychiatric symptoms are also reported; a strict CAG cutoff has not been universally established.
The first trial
Propranolol for Tremors in Spinocerebellar Ataxia Type 12: A Randomized Clinical TrialSixty patients randomised to extended-release propranolol or placebo. Propranolol significantly reduced tremor scores and improved quality of life, with good tolerability. A treatment for a symptom, and the first randomised trial in SCA12.
The library
Every paper in PubMed, Europe PMC or OpenAlex whose title names SCA12 or the PPP2R2B gene, newest first, compiled on 8 September 2026. Anything those catalogues miss is added by hand and marked as such. Listing a paper is not an endorsement of anything it discusses.
Journal of Neurology Neurosurgery & Psychiatry Research
Cerebellum
Acta neurologica Belgica
Annals of Movement Disorders
Stem cell research
Cerebellum
Magnetic resonance in chemistry
Parkinsonism & related disorders
Biochemistry and cell biology = Biochimie et biologie cellulaire
Movement disorders
The New Zealand medical journal
Zenodo
Neuro-degenerative diseases
Cellular signalling
Archives of Clinical Neuropsychology
Cerebellum
Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
Human molecular genetics
Research Square
Movement disorders clinical practice
Autophagy
Parkinsonism & related disorders
Movement disorders clinical practice
Tremor and other hyperkinetic movements
Biology direct
Biology direct
Stem cell research
Stem cell research
Cerebral cortex
iScience
Frontiers in neurology
Cellular and molecular life sciences
Journal of the American Society of Nephrology
Movement disorders
Research Square
Movement disorders clinical practice
Journal of the Neurological Sciences
Movement disorders
International Journal of Information Technology
Cell reports. Medicine
bioRxiv
Movement disorders clinical practice
European Neuropsychopharmacology
European neurology
Tremor and other hyperkinetic movements
Movement disorders
Annals of Indian Academy of Neurology
Studies in health technology and informatics
Research Square
Neurology
Clinical parkinsonism & related disorders
BMC genomic data
Movement disorders clinical practice
Parkinsonism & related disorders
Movement disorders clinical practice
Journal of the Neurological Sciences
Stem cell research
Movement disorders
Movement disorders clinical practice
Clinical Neurophysiology
Cancer cell international
Annals of Indian Academy of Neurology
Parkinsonism & Related Disorders
Brain communications
Movement disorders clinical practice
JCI insight
Neurogenetics
Annals of Movement Disorders
Movement disorders clinical practice
BMC neurology
Stem cell research
Parkinsonism & Related Disorders
Brain
Cambridge University Press eBooks
bioRxiv
Journal of genetics
Movement disorders
Current opinion in neurology
Journal of applied genetics
BMC neurology
Parkinsonism & related disorders
Journal of the neurological sciences
Medical science monitor
Movement disorders clinical practice
Parkinsonism & related disorders
Movement disorders clinical practice
Neuroscience research
Chinese Computed Medical Imaging
Handbook of clinical neurology
InTech eBooks
Zhongguo quanke yixue
Journal of Clinical Neurology
最新医学
最新医学
Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics
International journal of cancer
Neuroscience letters
Lume
The Journal of biological chemistry
Asian Biomedicine
Breast cancer research
Science-Business eXchange
Archives of neurology
Elsevier eBooks
Movement disorders
Human genetics
BMC cell biology
American journal of medical genetics. Part B, Neuropsychiatric genetics
Journal of genetics
The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques
The Journal of biological chemistry
Chin J Neurol
Nucleic acids and molecular biology
International Journal of Developmental Neuroscience
International Journal of Developmental Neuroscience
Journal of neurology, neurosurgery, and psychiatry
The Journal of molecular diagnostics
Journal of Sun Yat-sen University
Journal of applied genetics
American journal of medical genetics. Part B, Neuropsychiatric genetics
Elsevier eBooks
Cytogenetic and genome research
Annals of neurology
Neurology
Annals of neurology
Brain research bulletin
Neurology
Archives of neurology
Wider reading
The same search returns 282 further papers whose titles name neither SCA12 nor PPP2R2B — the gene in other diseases, or SCA12 mentioned in passing in a list of ataxias. They are kept, on their own page, for completeness.
Who works on this
SCA12 is studied by a small number of groups worldwide, with a significant share of the clinical literature coming from centres in India.
Neurologist
All India Institute of Medical Sciences (AIIMS), New Delhi
Clinical neurology and movement disorders, including the presentation and long-term course of hereditary ataxias.
Genetics researcher
CSIR–Institute of Genomics and Integrative Biology (CSIR-IGIB), New Delhi
Genomics of inherited neurological conditions, including repeat-expansion ataxias such as SCA12.
Getting involved
Progress in rare conditions depends on participation. Any opportunity is worth reviewing carefully for its purpose, what it asks of you, its risks, and its ethics approval.
Read about participation: Taking part in researchCure SCA12 is run by patients, not by a research group — but we can reach a community that is hard to reach from inside an institution. If you work on SCA12, are recruiting, or spot something wrong here, get in touch.
Contact Cure SCA12Last reviewed
Sourced from PubMed, Europe PMC and OpenAlex, searched on 8 September 2026, and the publisher’s own page for each hand-added entry. We do not paraphrase findings — please read the source.
Questions or a correction? info@sca12.org
Stay informed
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