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Start free with EleplanNeurodevelopmental delay-seizures-ophthalmic anomalies-osteopenia-cerebellar atrophy syndrome
ORPHA:529665Malformation syndrome
Also called GPAA1-related biosynthesis defect
What it is
A rare, genetic, syndromic intellectual disability characterized by global developmental delay, early-onset seizures, cerebellar atrophy, osteopenia, nystagmus and dysmorphic facial features, including bitemporal narrowing, prominent forehead, anteverted nares. Dysarthria, dysmetria, ataxic gait, spasticity and dysmorphic features have also been associated.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Infancy
- Inheritance
- Autosomal recessive
- Classified as
- Malformation syndrome
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Signs and symptoms
Common30–79%
25- Anteverted nares
- Bilateral tonic-clonic seizure
- Broad nasal tip
- Cerebellar atrophy
- Cerebellar hypoplasia
- Delayed speech and language development
- Difficulty standing
- Dysarthria
- Dysmetria
- Gait ataxia
- Gait disturbance
- Generalized hypotonia
- Hyperreflexia
- Hypertelorism
- Intellectual disability, mild
- Myopia
- Narrow forehead
- Neurodevelopmental delay
- Nystagmus
- Oculomotor apraxia
- Osteopenia
- Osteoporosis
- Prominent forehead
- Spasticity
- Tremor
These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
Gene
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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