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Features include always present findings: Delayed speech and language development, Global developmental delay, and Intellectual disability; and common findings: Sleep disturbance, Generalized hypotonia, Autistic behavior, and Drooling and others. 20 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 6 | Delayed speech and language development, Seizure, Global developmental delay |
POU3F3 function has not been fully characterized.
Snijders blok-fisher syndrome is associated with mutations in the POU3F3 gene on chromosome 2.
Genetic testing for POU3F3 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 3 always present features, 6 common features.
No clinical trials have been registered for snijders blok-fisher syndrome.
1 publication has been identified in PubMed for snijders blok-fisher syndrome. Research spans Basic Science / Preclinical (100%).
Tao Y (2025). [PMID: 40626178](https://pubmed.ncbi.nlm.nih.gov/40626178/). *Front Genet*. [Basic Science / Preclinical]
Data assembled from 6 of 12 sources · Last updated Sep 20, 2026, 3:12 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Bones and joints | 2 | Severe backward arching of the body (opisthotonus), Postural instability |
Muscles | 2 | Facial hypotonia, Generalized hypotonia |
Head and neck | 1 | Facial hypotonia |
Age of onset: infancy, at birth.