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Updated: May 22, 2025

Cerebellar Regional Dissection for Molecular Analysis

Cerebellar Regional Dissection for Molecular Analysis

Published on: December 5, 2020

CAG Repeat Instability and Region-Specific Gene Expression Changes in the SCA12 Brain.

Shreevidya Parthaje¹, Meghana Janardhanan^1,2,3, Pradip Paul¹

¹Molecular Genetics Laboratory, Department of Psychiatry, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India.

Cerebellum (London, England)

|March 13, 2025

Summary

Spinocerebellar ataxia type 12 (SCA12) involves CAG repeat instability in the brain. The cerebellum shows less instability, linked to higher methylation and lower PPP2R2B gene expression, suggesting new treatment avenues.

Keywords:

PPP2R2B Cerebellum Modifier genes Repeat instability Somatic mosaicism Spinocerebellar ataxia

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Area of Science:

Neurogenetics
Molecular Neurology
Genomic Instability

Background:

Spinocerebellar ataxia type 12 (SCA12) is an autosomal dominant disorder common in India, caused by expanded CAG repeats in the PPP2R2B gene.
SCA12 presents with diverse neurological and psychiatric symptoms, indicating widespread brain region involvement and neuronal loss.

Purpose of the Study:

To investigate CAG repeat instability, methylation, and gene expression of PPP2R2B across brain regions in SCA12.
To examine the regional expression of DNA repair and cell cycle genes in SCA12.

Main Methods:

Analysis of CAG repeat size, methylation, and PPP2R2B gene expression in brain tissue from an SCA12 patient.
Assessment of regional DNA repair and cell cycle gene expression.

Main Results:

Somatic mosaicism (CAG repeat instability) was detected across brain regions, with the cerebellum exhibiting the least instability.
The cerebellum showed increased PPP2R2B methylation and lower gene expression.
Increased expression of DNA maintenance genes and decreased expression of cell cycle modulators were observed in the cerebellum.

Conclusions:

Somatic mosaicism in SCA12 varies by brain region, correlating with methylation and gene expression patterns.
Enhanced DNA repair pathways and reduced cell cycle modulation in the cerebellum may contribute to regional differences in neuronal vulnerability.
Therapeutic strategies targeting DNA repeat stability could be beneficial for SCA12 treatment.