familial developmental dysphasia
Findings
No curated finding names familial developmental dysphasia yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Familial developmental dysphasia is a severe form of developmental verbal apraxia characterized by a deficit in spontaneous speech, writing, grammatical judgment and repetition, defective articulation, moderate to severe degree of dyspraxia, a reduced use of consonant clusters, and comprehension delay. Hearing and intelligence are normal.
Definition from the Mondo Disease Ontology (MONDO:0010821), read 2026-09-29. CC BY 4.0.
Features
3 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.
- AphasiaHPOHP:0002381
- Very frequent (80% to 99% of cases)
- Expressive language delayHPOHP:0002474
- Very frequent (80% to 99% of cases)
- Incomprehensible speechHPOHP:0002546
- Very frequent (80% to 99% of cases)
Where it sits
Other names
2 names
Resolves to: familial developmental dysphasia
- Also called
- Billard-Toutain-Maheut syndromeFOXP2-associated dysphasia