Journal Article

Targeted disruption of the <i>Epm2a</i> gene causes formation of Lafora inclusion bodies, neurodegeneration, ataxia, myoclonus epilepsy and impaired behavioral response in mice

Subramaniam Ganesh, Antonio V. Delgado-Escueta, Toshiro Sakamoto, Maria Rosa Avila, Jesus Machado-Salas, Yoshinobu Hoshii, Takumi Akagi, Hiroshi Gomi, Toshimitsu Suzuki, Kenji Amano, Kishan Lal Agarwala, Yuki Hasegawa, Dong-Sheng Bai, Tokuhiro Ishihara, Tsutomu Hashikawa, Shigeyoshi Itohara, Eain M. Cornford, Hiroaki Niki and Kazuhiro Yamakawa

in Human Molecular Genetics

Volume 11, issue 11, pages 1251-1262
Published in print May 2002 | ISSN: 0964-6906
Published online May 2002 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/11.11.1251
Targeted disruption of the Epm2a gene causes formation of Lafora inclusion bodies, neurodegeneration, ataxia, myoclonus epilepsy and impaired behavioral response in mice

Show Summary Details

Preview

Mutations in the EPM2A gene encoding a dual-specificity phosphatase (laforin) cause Lafora disease (LD), a progressive and invariably fatal epilepsy with periodic acid–Schiff-positive (PAS+) cytoplasmic inclusions (Lafora bodies) in the central nervous system. To study the pathology of LD and the functions of laforin, we disrupted the Epm2a gene in mice. At two months of age, homozygous null mutants developed widespread degeneration of neurons, most of which occurred in the absence of Lafora bodies. Dying neurons characteristically exhibit swelling in the endoplasmic reticulum, Golgi networks and mitochondria in the absence of apoptotic bodies or fragmentation of DNA. As Lafora bodies become more prominent at 4–12 months, organelles and nuclei are disrupted. The Lafora bodies, present both in neuronal and non-neural tissues, are positive for ubiquitin and advanced glycation end-products only in neurons, suggesting different pathological consequence for Lafora inclusions in neuronal tissues. Neuronal degeneration and Lafora inclusion bodies predate the onset of impaired behavioral responses, ataxia, spontaneous myoclonic seizures and EEG epileptiform activity. Our results suggest that LD is a primary neurodegenerative disorder that may utilize a non-apoptotic mechanism of cell death.

Journal Article.  6981 words.  Illustrated.

Subjects: Genetics and Genomics

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.