Development of language in Rett syndrome.

Abstract:

:Ninety-nine cases of Rett syndrome (RTT) diagnosed clinically (age range 3 years 6 months to 29 years 9 months) were evaluated for the ability of language. The presence of meaningful words, vocabularies, and ages at the start and disappearance of speech were assessed. Phenotype/genotype correlation was evaluated in 22 cases in whom mutations of the genes of methyl-CpG-binding protein 2 (MECP2) existed. Fifty-five cases (55.5%) could speak some words, and of them eight cases (14.5%) spoke two-word sentences. No case had more than 40 words. The vocabularies were mainly bilabial words, known as the characteristics of the initial words in normal children. They began to utter a word between 12 and 48 months, and most of them (85.4%) before 20 months. Those who spoke two-word sentence(s) began to utter a word earlier (10.4+/-3.7 months) than others (17.1+/-9.8 months). Thirty-three cases lost their word(s) in 12-36 months. Among 22 gene-proven cases two cases with mutation of R133C and two cases with R294X had word(s), but another two cases with T158M had not. In RTT a delay in the neuronal systems involved in normal speech development was suggested and its severity seemed to depend on the loci of mutation.

journal_name

Brain Dev

journal_title

Brain & development

authors

Uchino J,Suzuki M,Hoshino K,Nomura Y,Segawa M

doi

10.1016/s0387-7604(01)00367-9

keywords:

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

S233-5

eissn

0387-7604

issn

1872-7131

pii

S0387760401003679

journal_volume

23 Suppl 1

pub_type

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