| DRPLA Gene | |
|---|---|
| Full Name | Dentatorubral-Pallidoluysian Atrophy |
| Symbol | DRPLA |
| UniProt | P55072 |
| NCBI Gene | 1785 |
| Chromosome | 12p13.31 |
| Exons | 10 |
| Protein | Atrophin-1 (ATN1) |
| Protein Size | 1,190 amino acids |
| Expression | Ubiquitous, highest in brain (cerebellum, basal ganglia) |
| Associated Diseases | Dentatorubral-Pallidoluysian Atrophy, Huntington's Disease |
The DRPLA gene (Dentatorubral-Pallidoluysian Atrophy) encodes the protein atrophin-1 (ATN1), a transcriptional co-repressor involved in neuronal development and function. Expansion of a CAG trinucleotide repeat within the DRPLA gene causes the neurodegenerative disorder DRPLA, characterized by cerebellar ataxia, choreoathetosis, and progressive dementia.
The DRPLA gene is located on chromosome 12p13.31 and contains 10 exons spanning approximately 11 kb of genomic DNA [1]. The gene encodes atrophin-1, a 1,190 amino acid protein that is ubiquitously expressed but shows highest levels in the cerebellum and basal ganglia—brain regions most affected in DRPLA patients.
DRPLA is classified as a polyglutamine (polyQ) disease, joining Huntington's disease (HD), several spinocerebellar ataxias (SCAs), and spinal bulbar muscular atrophy (SBMA) in this group of inherited neurodegenerative disorders.
The pathogenic mutation in DRPLA is an expansion of a CAG trinucleotide repeat in exon 5:
The CAG repeat is unstable during meiosis, particularly in paternal transmission, showing anticipation (earlier onset in successive generations).
Atrophin-1 is a nuclear protein with several functional domains:
Atrophin-1 functions as a transcriptional co-repressor:
In the healthy brain, atrophin-1 is involved in:
Like other polyQ diseases, DRPLA is caused by a toxic gain-of-function in the mutant protein:
Atrophin-1 with expanded polyQ alters transcription of:
DRPLA neurons contain:
| Feature | Description |
|---|---|
| Age of onset | 20-50 years (adult), <20 years (juvenile) |
| Core symptoms | Ataxia, choreoathetosis, myoclonus, dementia |
| Additional features | Seizures (especially juvenile onset), psychiatric symptoms |
| Progression | Progressive over 10-30 years |
| Neuropathology | Cerebellar atrophy, pallidal degeneration, neuronal loss |
Current research focuses on:
The study of Drpla Gene 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.