Lafora progressive myoclonus epilepsy mutation database-EPM2A and NHLRC1 (EMP2B) genes

Authors

  • Leonarda Ianzano,

    1. Department of Genetics and Genomic Biology, Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
    2. Laboratory of Medical Genetics, Mauro Baschirotto Institute for Rare Disease, Vicenza, Italy
    Search for more papers by this author
  • Junjun Zhang,

    1. Department of Genetics and Genomic Biology, Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
    Search for more papers by this author
  • Elayne M. Chan,

    1. Department of Genetics and Genomic Biology, Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
    Search for more papers by this author
  • Xiao-Chu Zhao,

    1. Department of Genetics and Genomic Biology, Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
    Search for more papers by this author
  • Hannes Lohi,

    1. Department of Genetics and Genomic Biology, Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
    Search for more papers by this author
  • Stephen W. Scherer,

    1. Department of Genetics and Genomic Biology, Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
    Search for more papers by this author
  • Berge A. Minassian

    Corresponding author
    1. Department of Genetics and Genomic Biology, Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
    2. Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada
    • Department of Genetics and Genomic Biology and Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada
    Search for more papers by this author

Abstract

Progressive Myoclonus Epilepsy (PME) of the Lafora type is an autosomal recessive disease, which presents in teenage years with myoclonia and generalized seizures leading to death within a decade of onset. It is characterized by pathognomonic inclusions, Lafora bodies (LB), in neurons and other cell types. Two genes causing Lafora disease (LD), EPM2A on chromosome 6q24 and NHLRC1 (EPM2B) on chromosome 6p22.3 have been identified, and our recent results indicate there is at least one other gene causing the disease. The EPM2A gene product, laforin, is a protein tyrosine phosphatase (PTP) with a carbohydrate-binding domain (CBD) in the N-terminus. NHLRC1 encodes a protein named malin, containing a zinc finger of the RING type in the N-terminal half and 6 NHL-repeat domains in the C-terminal direction. To date 43 different variations in EPM2A and 23 in NHLRC1 are known, including missense, nonsense, frameshift, and deletions. We have developed a human LD mutation database using a new generic biological database cross-referencing platform. The database, which currently contains 66 entries is accessible on the World Wide Web (http://projects.tcag.ca/lafora). Entries can be submitted via the curator of the database or via a web-based form. © 2005 Wiley-Liss, Inc.

Ancillary