STXBP1-related developmental and epileptic encephalopathy

What it is

A rare genetic neurological disorder characterized by a phenotypic spectrum comprising severe intellectual disability, developmental delay, and, in the majority of cases, early-onset epilepsy. The most frequent seizure type are epileptic spasms, but a broad spectrum of seizure types has been reported. Motor disturbances include ataxia, hypotonia, dystonia, tremor, spasticity, and dyskinesia. Some patients may also present with autism/autistic-like features. Older patients have been reported to show signs of parkinsonism, including tremor, bradykinesia, and antecollis.

Key facts

Prevalence

1-9 / 1 000 000

Age of onset

Neonatal

Inheritance

Autosomal dominant

Classified as

Disease

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

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