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Proximal myotonic myopathy with MRI white matter abnormalities of the brain
Abstract:
Proximal myotonic myopathy (PROMM) is an autosomal dominantly inherited multisystemic disorder characterized by myotonia, proximal muscle weakness, and cataracts. This disorder is not linked to the gene locus of myotonic dystrophy (DM). We describe three new families with PROMM. In all patients, CTG repeats of the DM gene in DNA from blood leukocytes were normal. MRI of the brain revealed a consistent pattern of marked white matter hyperintensity on T2-weighted images in four patients; two additional patients had similar but mild to moderate MRI abnormalities. The morphology of these abnormalities is unknown. Clinical symptoms of brain disease were not consistent and included mental changes with hypersomnia, parkinsonian features, stroke-like episodes, and seizures. The causative relationship of these clinical features with the MRI white matter abnormalities remains to be established. Our observations suggest that PROMM may involve the brain.
Insights
Proximal myotonic myopathy (PROMM) may affect the brain, as indicated by white matter abnormalities found via MRI in affected individuals. Further research is needed to confirm the link between these brain changes and PROMM
Area of Science:
- Neurology
- Genetics
- Medical Imaging
Background:
- Proximal myotonic myopathy (PROMM) is an inherited disorder affecting multiple systems, including muscle and eyes.
- PROMM is distinct from myotonic dystrophy (DM) and not linked to its gene locus.
- Previous studies have not extensively investigated potential central nervous system involvement in PROMM.
Purpose of the Study:
- To investigate potential brain involvement in patients diagnosed with Proximal Myotonic Myopathy (PROMM).
- To characterize brain abnormalities using Magnetic Resonance Imaging (MRI) in PROMM patients.
- To explore the correlation between brain findings and clinical symptoms in PROMM.
Main Methods:
- Recruitment of three new families with diagnosed PROMM.
- Genetic analysis of CTG repeats in the DM gene for all patients.
- Brain Magnetic Resonance Imaging (MRI) using T2-weighted sequences to assess white matter.
Main Results:
- All patients exhibited normal CTG repeat lengths in the DM gene.
- Four out of six PROMM patients showed significant white matter hyperintensities on brain MRI.
- Two additional patients presented with mild to moderate MRI abnormalities.
- Clinical neurological symptoms were inconsistent among patients, including hypersomnia, parkinsonism, and seizures.
Conclusions:
- PROMM may be a multisystem disorder that involves the brain.
- MRI reveals consistent white matter abnormalities in a subset of PROMM patients.
- The clinical significance and causative relationship of observed brain abnormalities in PROMM require further investigation.