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  • Title: CDK13-related disorder: a deep characterization of speech and language abilities and addition of 33 novel cases.
    Author: Morison LD, van Reyk O, Forbes E, Rouxel F, Faivre L, Bruinsma F, Vincent M, Jacquemont ML, Dykzeul NL, Geneviève D, Amor DJ, Morgan AT.
    Journal: Eur J Hum Genet; 2023 Jul; 31(7):793-804. PubMed ID: 36599938.
    Abstract:
    Speech and language impairments are central features of CDK13-related disorder. While pathogenic CDK13 variants have been associated with childhood apraxia of speech (CAS), a systematic characterisation of communication has not been conducted. Here we examined speech, language, non-verbal communication skills, social behaviour and health and development in 41 individuals with CDK13-related disorder from 10 countries (male = 22, median-age 7 years 1 month, range 1-25 years; 33 novel). Most participants used augmentative and alternative communication (AAC) in early childhood (24/41). CAS was common (14/22). Performance varied widely across intellectual ability, social behaviour and expressive language skills, with participants ranging from within average through to the severely impaired range. Receptive language was significantly stronger than expressive language ability. Social motivation was a relative strength. In terms of a broader health phenotype, a quarter had one or more of: renal, urogenital, musculoskeletal, and cardiac malformations, vision impairment, ear infections and/or sleep disturbance. All had gross and fine motor impairments (41/41). Other conditions included mild-moderate intellectual disability (16/22) and autism (7/41). No genotype-phenotype correlations were found. Recognition of CAS, a rare speech disorder, is required to ensure appropriately targeted therapy. The high prevalence of speech and language impairment underscores the importance of tailored speech therapy, particularly early access to AAC supports.
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