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Familial developmental dysphasia

Synonym(s) Billard-Toutain-Maheut syndrome
FOXP2-associated dysphasia
Prevalence <1 / 1 000 000
Inheritance Autosomal dominant
Age of onset Childhood
  • F80.1
MeSH -
MedDRA -


Disease 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.

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