What question did this study set out to answer?

Determine the prevalence, diagnostic sensitivity, and specificity of sarcoplasmic TDP-43 localization compared to conventional histological biomarkers in inclusion body myositis.

June 16, 2009Muscle & Nerve

Sarcoplasmic redistribution of nuclear TDP‐43 in inclusion body myositis

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Authors

MSMohammad SalajeghehVA Boston Healthcare System JPJack L. PinkusBrigham and Women's Hospital JTJ. Paul TaylorLeiden University

Discussion

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Implication

Biopsy analysis uncovers high diagnostic sensitivity and specificity of sarcoplasmic TDP-43 in inclusion body myositis, suggesting disruption of extranuclear muscle RNA maintenance.

Key Points

Determine the prevalence, diagnostic sensitivity, and specificity of sarcoplasmic TDP-43 localization compared to conventional histological biomarkers in inclusion body myositis.
Quantified myofiber immunoreactivity for TDP-43, rimmed vacuoles, Congo red, SMI-31, and R1282 beta-amyloid in muscle tissue.
Evaluated diagnostic performance across 50 inflammatory myopathy patient samples and sequenced TDP-43 to screen for mutations.
Sarcoplasmic TDP-43 immunoreactivity occurred in 23% of inclusion body myositis myofibers, surpassing rimmed vacuoles (2.8%), Congo red (0.57%), SMI-31 (0.83%), and R1282 beta-amyloid (0.00%).
A cutoff of >1% myofibers showing nonnuclear sarcoplasmic TDP-43 demonstrated 91% sensitivity and 100% specificity for inclusion body myositis among inflammatory myopathies, with zero TDP-43 mutations identified.

Cite This Study

Salajegheh et al. (2009) studied this question.

synapsesocial.com/papers/6a98cc4f3ea09d5cf8f5988d https://doi.org/10.1002/mus.21386

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Implication

Biopsy analysis uncovers high diagnostic sensitivity and specificity of sarcoplasmic TDP-43 in inclusion body myositis, suggesting disruption of extranuclear muscle RNA maintenance.

Sarcoplasmic redistribution of nuclear TDP‐43 in inclusion body myositis

Discussion

Member takes

Implication

Key Points

Cite This Study

Sarcoplasmic redistribution of nuclear TDP‐43 in inclusion body myositis

Discussion

Member takes

Implication

Key Points

Cite This Study

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