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Development of language in Rett syndrome
J Uchino1, M Suzuki, K Hoshino
1Segawa Neurological Clinic for Children, 2-8 Surugadai, Kanda Chiyodaku, 101-0062, Tokyo, Japan.
Brain & Development
|December 12, 2001
Summary
Rett syndrome (RTT) significantly impacts speech development, with over half of individuals retaining some words. Speech loss and mutation type influence language abilities in RTT patients.
Area of Science:
- Neuroscience
- Genetics
- Developmental Biology
Background:
- Rett syndrome (RTT) is a rare neurodevelopmental disorder.
- Language and speech impairments are characteristic features of RTT.
- Understanding the spectrum of language abilities is crucial for patient care and research.
Purpose of the Study:
- To evaluate the language abilities in a cohort of individuals with Rett syndrome.
- To assess the age of speech onset and loss in RTT.
- To explore genotype-phenotype correlations related to MECP2 mutations and language skills.
Main Methods:
- Clinical assessment of language abilities in 99 RTT cases.
- Evaluation of word presence, vocabulary size, and speech onset/disappearance ages.
- Genotype analysis of MECP2 mutations in 22 cases to correlate with language phenotype.
Main Results:
- 55.5% of RTT cases exhibited some words, with 14.5% forming two-word sentences; vocabulary rarely exceeded 40 words.
- Speech onset occurred between 12-48 months (85.4% before 20 months).
- MECP2 mutation type (R133C, R294X, T158M) showed varied associations with word retention.
Conclusions:
- RTT is associated with delayed speech development and potential loss of acquired speech.
- The severity of speech impairment in RTT may correlate with the specific MECP2 mutation locus.
- Further research into neuronal system delays in RTT speech development is warranted.