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Functional skills in MECP2 duplication syndrome: developmental dynamics and regression.

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Summary

MECP2 duplication syndrome (MDS) affects functional skills, with regression common in speech and motor abilities. Females show varied skill acquisition, and larger duplications correlate with reduced walking ability.

Keywords:
MECP2 duplication syndromeFunctional skillsIntellectual disabilityNeurodevelopmentalRegressionX-linked

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • MECP2 duplication syndrome (MDS) is a rare X-linked neurodevelopmental disorder with poorly understood natural history and variable phenotypes.
  • Limited data exists on skill acquisition, retention, and loss in individuals with MDS, particularly concerning gross motor, fine motor, and communication skills.

Purpose of the Study:

  • To characterize the developmental trajectory of functional skills in the largest case series of MECP2 duplication syndrome to date.
  • To investigate factors influencing skill acquisition and loss, including sex, age, seizures, and duplication size.

Main Methods:

  • Retrospective analysis of functional skill data from 160 individuals with genetically confirmed MDS.
  • Data collection included parent-reported information on gross motor, fine motor, communication, and feeding skills.
  • Statistical analysis was performed to compare skill acquisition and regression rates based on sex, age, seizure status, and genetic duplication length.

Main Results:

  • Phenotypic variability observed, with some females exhibiting similar functional deficits to males, though females had higher gross and fine motor skill acquisition rates.
  • Most common skill regressions included speech (38%), fine motor/hand function (29%), walking (28%), and feeding (28%).
  • Seizures, increasing age, and larger duplication lengths (>1 Mb) were associated with lower functional abilities and reduced likelihood of acquiring independent walking.

Conclusions:

  • This study provides a comprehensive baseline for understanding the natural history of functional skill development in MDS.
  • Functional skill deficits are influenced by sex, age, comorbidities like seizures, and genetic factors such as duplication size.
  • Further research is needed to explore the impact of interventions on skill maintenance in individuals with MDS.