intellectual developmental disorder with severe speech and ambulation defects
Findings
No curated finding names intellectual developmental disorder with severe speech and ambulation defects yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Any BAFopathy in which the cause of the disease is a mutation in the ACTL6B gene.
Definition from the Mondo Disease Ontology (MONDO:0032770), read 2026-09-29. CC BY 4.0.
- Inheritance
- Autosomal dominant inheritance
- Onset and course
- Infantile onset
HPO, annotations 2026-09-02
Features
20 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Bulbous noseHPOHP:0000414
- 10 of 10 reported patients
- Severe global developmental delayHPOHP:0011344
- 10 of 10 reported patients
- Severe intellectual disabilityHPOHP:0010864
- 10 of 10 reported patients
- HypotoniaHPOHP:0001252
- 5 of 6 reported patients
- Absent speechHPOHP:0001344
- 8 of 10 reported patients
- Wide mouthHPOHP:0000154
- 6 of 9 reported patients
- Autistic behaviorHPOHP:0000729
Show the remaining 8
- Global brain atrophyHPOHP:0002283
- 1 of 4 reported patients
- Hypoplasia of the corpus callosumHPOHP:0002079
- 1 of 4 reported patients
- Broad-based gaitHPOHP:0002136
- 2 of 10 reported patients
- MicrocephalyHPOHP:0000252
- 2 of 10 reported patients
- Small nailHPOHP:0001792
- 2 of 10 reported patients
- Bilateral tonic-clonic seizureHPOHP:0002069
- 1 of 9 reported patients
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- ACTL6BHGNC:160
- Strong · Labcorp Genetics (formerly Invitae) · Autosomal dominant · 2020
- Strong · PanelApp Australia · Autosomal dominant · 2025
- Moderate · Ambry Genetics · Autosomal dominant · 2022
- Limited · G2P · Autosomal dominant · 2019
Where it sits
- A kind of
Other names
1 name
Resolves to: intellectual developmental disorder with severe speech and ambulation defects
- Also called
- ACTL6B-related BAFopathy