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Utility of Dissociated Intrinsic Hand Muscle Atrophy in the Diagnosis of Amyotrophic Lateral Sclerosis

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Cognitive function in facioscapulohumeral dystrophy correlates with the molecular defect.

A Sistiaga¹, P Camaño, D Otaegui

¹Experimental Unit, Donostia Hospital, Spain, CIBER Neurodegenerative Diseases (CIBERNED), Spain. andone.sistiagaberrondo@osakidetza.net

Genes, Brain, and Behavior

|October 1, 2008

Summary

Facioscapulohumeral dystrophy (FSHD) patients with smaller molecular defects (< or = 24 kb) exhibit reduced IQ and cognitive challenges. Fragment size predicts cognitive outcomes in FSHD, suggesting CNS involvement.

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Area of Science:

Neurology
Genetics
Psychology

Background:

Previous research suggested central nervous system (CNS) involvement in facioscapulohumeral dystrophy (FSHD) based on case studies and imaging.
The specific relationship between cognitive and personality patterns and the molecular basis of FSHD remains underexplored.

Purpose of the Study:

To investigate the link between cognitive/personality profiles and the molecular defect in FSHD.
To identify distinct cognitive patterns associated with different molecular defects in FSHD patients.

Main Methods:

A comprehensive neuropsychological assessment was conducted on 34 molecularly confirmed FSHD patients and 49 controls.
The Millon-II Multiaxial Clinical Inventory (MCMI-II) was administered to all participants.
Intelligence quotient (IQ) and fragment size were analyzed in relation to cognitive performance.

Main Results:

Patients with FSHD showed mild learning-level differences compared to controls, with a statistically higher hysteriform scale score.
FSHD patients' IQ correlated with the size of the deleted DNA fragment, not the severity of muscle impairment.
A fragment size cutoff of 24 kb differentiated cognitive profiles: >24 kb associated with normal cognition, <=24 kb with reduced IQ and specific functional difficulties.

Conclusions:

The study provides further evidence for CNS involvement in FSHD.
Molecular defect size (fragment size) is a significant predictor of the cognitive phenotype in FSHD.
Fragment size should be considered in the clinical management of FSHD due to its predictive value for cognitive outcomes.