Trait
Hemiballismus
Hemiballismus is a rare movement disorder that is caused primarily by damage to various areas in the basal ganglia. Hemiballismus is usually characterized by involuntary flinging motions of the extremities. The movements are often violent and have wide amplitudes of motion. They are continuous and random and can involve proximal and/or distal muscles on one side of the body, while some cases even include the facial muscles. The more a patient is active, the more the movements increase. With relaxation comes a decrease in movements.
Summary
- Body system
- Abnormality of the nervous system
Reference genomeGRCh38hg38
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Get my Genome Test4 genes linked to Hemiballismus
Changes in these genes cause rare conditions in which Hemiballismus is seen. Most people with this trait have none of those conditions, and a gene on this list says nothing about anyone's own genome.
| Gene | How often it is seen | Conditions |
|---|---|---|
| MRM2mitochondrial rRNA methyltransferase 2 | Always | In 1 condition |
| EIF2AK2eukaryotic translation initiation factor 2 alpha kinase 2 | Sometimes (5–29%) | In 1 condition |
| PDE10Aphosphodiesterase 10A | Sometimes (5–29%) | In 2 conditions |
| SYT1synaptotagmin 1 | Sometimes (5–29%) | In 1 condition |
How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.
Broader traits
Where this comes from
- The Human Phenotype Ontology, release 2026-09-01: the trait, its names, its definition and the genes linked to it. Find out more at hpo.jax.org.
- Data release 2026.10.16-c6eea6bf.
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