Trait
Persistent asymmetrical tonic neck reflex
Persistence beyond the normal age (roughly the first half of the first year of life) of the asymmetric tonic neck reflex (ATNR), which is an easily elicited primitive reflex in the immediate newborn period. The ATNR refers to the phenomenon whereby when the face of an infant is turned to one side, the ipsilateral arm and leg extend and the contralateral arm and leg flex. This posture has been compared to a typical posture of fencers.
Summary
- Also called
- Persistent fencer's reflex, Tonic neck reflex asymmetrical and persistent
- Body system
- Abnormality of the nervous system
Reference genomeGRCh38hg38
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Get my Genome Test1 gene linked to Persistent asymmetrical tonic neck reflex
Changes in these genes cause rare conditions in which Persistent asymmetrical tonic neck reflex 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 |
|---|---|---|
| ZIC2Zic family zinc finger 2 | Always | 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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