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Mutations in NHLRC1 cause progressive myoclonus epilepsy
Elayne M Chan1, Edwin J Young, Leonarda Ianzano
1Program in Genetics and Genomic Biology, Research Institute, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada.
Nature Genetics
|September 6, 2003
Summary
Lafora disease, a progressive myoclonus epilepsy, involves endoplasmic reticulum polyglucosan buildup. Researchers identified NHLRC1 (EPM2B) as a second gene linked to Lafora disease, encoding the protein malin.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Lafora progressive myoclonus epilepsy is defined by endoplasmic reticulum (ER)-associated polyglucosan accumulations.
- Mutations in the EPM2A gene were previously identified as a cause of Lafora disease.
Purpose of the Study:
- To identify additional genetic factors contributing to Lafora disease.
- To elucidate the molecular mechanisms underlying polyglucosan accumulation in the ER.
Main Methods:
- Genetic analysis to identify mutations in affected individuals.
- Protein localization studies to determine the cellular location of newly identified proteins.
- Biochemical assays to understand protein function and interactions.
Main Results:
- A second gene, NHLRC1 (also known as EPM2B), was identified as being associated with Lafora disease.
- NHLRC1 encodes malin, a protein with a RING finger domain and NHL motifs, identified as a putative E3 ubiquitin ligase.
- Laforin and malin were found to colocalize to the ER.
Conclusions:
- Malin, encoded by NHLRC1, is implicated in the pathogenesis of Lafora disease.
- The colocalization of laforin and malin suggests they function in a common pathway to prevent polyglucosan accumulation and epilepsy.
- This finding expands our understanding of the molecular basis of Lafora disease and potential therapeutic targets.