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Rett syndrome--clinical studies and pathophysiological consideration
Insights
Rett syndrome pathogenesis involves brainstem lesions affecting CNS development. This neurodevelopmental disorder may involve serotonergic and catecholaminergic neurons, requiring further study.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Rett syndrome is a rare neurodevelopmental disorder primarily affecting females.
- Characterized by a specific sequence of clinical symptoms and progressive neurological decline.
- Previous research suggests a complex etiology, but the precise pathogenesis remains unclear.
Purpose of the Study:
- To investigate the pathogenesis of Rett syndrome.
- To correlate clinical, electrophysiological, and polysomnographical findings with potential underlying brain abnormalities.
- To explore the role of specific neurotransmitter systems in the syndrome's progression.
Main Methods:
- Clinical evaluation of eleven female patients with Rett syndrome.
- Surface electromyography (EMG) to assess motor control.
- Serial polysomnographical examinations to analyze sleep architecture.
- Comparison with other neurological diseases and animal models.
Main Results:
- Observed an orderly sequence and progression of clinical symptoms, including microcephaly.
- EMG revealed rhythmic discharges associated with stereotyped hand movements.
- Polysomnography indicated abnormalities in sleep components and increased REM sleep percentage with age.
- Hypothesized early, progressive brainstem lesions impacting higher CNS function.
Conclusions:
- Early and progressive brainstem lesions are implicated in Rett syndrome pathophysiology.
- Serotonergic and catecholaminergic neurons may play a role.
- Further biochemical and histochemical brain examinations are needed to elucidate pathogenesis and etiology.
- The cause of associated gynecological issues requires further investigation.
Abstract:
Eleven female patients with Rett syndrome were evaluated for detecting the pathogenesis. Clinical symptoms were characterized by their orderly sequence of occurrence of particular symptoms at particular ages starting from early infancy, and their progression. Increment of head circumference tapered from late infancy, resulting in microcephalus which corresponded with the clinical features. Surface EMG revealed the tremulous rhythmic discharge underlying the characteristic stereotyped movement of the hands. Serial polysomnographical examinations showed abnormalities of the tonic and phasic components of sleep and increment of % REM stage with age. The results of these clinical, laboratory and polysomnographical examinations were discussed, comparing with other neurological diseases and knowledge of animal experiments. From these findings the pathophysiology of Rett syndrome could be explained by the early and progressive lesions in the brain stem nuclei, which influence the maturation and function of particular parts of the higher central nervous system. Serotonergic and catecholaminergic neurons might have important roles in the pathophysiology of this syndrome. However, biochemical and histochemical examinations of the brain are necessary for detecting the pathogenesis and etiology. And the cause of gynecopathy also remains to be clarified.