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Related Experiment Video

Updated: Jun 13, 2026

A Quick Phenotypic Neurological Scoring System for Evaluating Disease Progression in the SOD1-G93A Mouse Model of ALS
06:49

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9 year old girl with progressive weakness.

Natashia Seemann, Craig Campbell, Robert Hammond

    Brain Pathology (Zurich, Switzerland)
    |May 5, 2010
    PubMed
    Summary

    This case study details a 9-year-old girl with Duchenne mosaic muscular dystrophy, diagnosed due to progressive weakness. Unfavorable lyonization is proposed as the cause, confirmed by X-inactivation studies.

    Area of Science:

    • Neurology
    • Genetics
    • Pediatrics

    Background:

    • A 9-year-old female presented with progressive muscle weakness and pain.
    • Her history included spina bifida, Chiari type II malformation, and hydrocephalus, with delayed motor milestones.

    Observation:

    • Neurological examination revealed weakness in shoulder adduction, hip/knee flexion, and a partial Gower's maneuver.
    • Muscle biopsy demonstrated dystrophic changes.

    Findings:

    • Immunohistochemistry and DNA analysis confirmed Duchenne mosaic muscular dystrophy.
    • X-inactivation studies supported unfavorable lyonization as the pathogenic mechanism.

    Implications:

    • This case highlights the importance of considering mosaic forms of muscular dystrophy.

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  • Understanding X-inactivation patterns is crucial for diagnosing and managing such conditions.