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Brain disease and molecular analysis in myotonic dystrophy
M S Damian1, G Bachmann, M C Koch
1Department of Neurology, Justus-Liebig-University, Giessen, Germany.
Neuroreport
|December 20, 1994
Summary
Myotonic dystrophy (DM) brain disease is linked to CTG repeat expansion. Larger repeat expansions correlate with cognitive deficits, while MRI findings associate with psychometric performance decline.
Area of Science:
- Neurology
- Genetics
- Molecular Biology
Background:
- Myotonic dystrophy (DM) is caused by abnormal CTG repeat amplification on chromosome 19.
- Repeat expansion severity correlates with clinical features.
Purpose of the Study:
- To investigate the relationship between the molecular defect and brain disease in DM.
- To correlate cognitive function, brain MRI findings, and CTG repeat size.
Main Methods:
- Performed cognitive testing, cerebral MRI, and molecular analysis in 28 DM patients.
- Quantified CTG repeat length and assessed cognitive performance and MRI abnormalities.
Main Results:
- 10 out of 28 patients showed pathological cognitive test performance.
- 14 patients had subcortical white matter lesions, and 14 had cerebral atrophy on MRI.
- CTG repeat amplification over 1000 trinucleotides strongly correlated with cognitive deficits.
- MRI lesions were linked to impaired psychometric performance, but MRI and molecular findings showed weak correlation.
- Disease duration influenced white matter lesion development.
Conclusions:
- CTG repeat size quantification may predict brain involvement probability in DM.
- Cognitive dysfunction is associated with white matter lesions and cerebral atrophy in later disease stages.