A new X-linked mental retardation syndrome
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Updated: Nov 6, 2026

A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome
Published on: May 22, 2019
T Homfray1, T Holland, M Patton
1Department of Genetics, St George's Hospital Medical School, London, UK.
Abstract:
There are now more than 70 X-linked mental retardation syndromes associated with physical findings documented in McKusick's "Mendelian Inheritance in Man". We describe a boy and his maternal uncle who appear to have a previously unreported X-linked mental retardation syndrome, consisting of moderate mental retardation, coarse facial features, epilepsy and slowly progressive joint contractures.
Insights
A new X-linked mental retardation syndrome is described in a boy and his maternal uncle. This previously unreported syndrome includes moderate intellectual disability, coarse facial features, epilepsy, and joint contractures.
Area of Science:
- Genetics
- Neurology
- Pediatrics
Background:
- Over 70 X-linked mental retardation syndromes are documented.
- These syndromes often present with distinct physical findings.
Observation:
- A boy and his maternal uncle were identified with a potential new syndrome.
- The affected individuals presented with moderate intellectual disability.
Findings:
- The previously unreported X-linked syndrome is characterized by moderate mental retardation.
- Additional features include coarse facial features, epilepsy, and slowly progressive joint contractures.
Implications:
- This case expands the known spectrum of X-linked intellectual disability disorders.
- Further research is needed to identify the specific genetic cause and understand the pathophysiology.
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