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Volume 17, Number 16, Issue of August 15, 1997 pp. 6236-6242
Copyright ©1997 Society for Neuroscience

A Genetic Animal Model of Human Neocortical Heterotopia Associated with Seizures

Received March 21, 1997; revised May 29, 1997; accepted June 2, 1997.

Kevin S. Lee¹, Frank Schottler¹, Jennifer L. Collins¹, Giuseppe Lanzino¹, Daniel Couture¹, Anand Rao¹, Ken-ichiro Hiramatsu¹, Yasunobu Goto¹, Seung-Chyul Hong¹, Hakan Caner¹, Haruaki Yamamoto¹, Zong-Fu Chen¹, Edward Bertram², Stuart Berr³, Reed Omary³, Heidi Scrable⁴, Theodore Jackson¹, John Goble¹, and Leonard Eisenman⁵

Departments of ¹ Neurological Surgery, ² Neurology, ³ Radiology, and ⁴ Neuroscience, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908, and ⁵ Department of Pathology and Anatomy, Thomas Jefferson University, Philadelphia, Pennsylvania 19107

Malformations of the human neocortex are commonly associated with developmental delays, mental retardation, and epilepsy. This study describes a novel neurologically mutant rat exhibiting a forebrain anomaly resembling the human neuronal migration disorder of double cortex. This mutant displays a telencephalic internal structural heterotopia (tish) that is inherited in an autosomal recessive manner. The bilateral heterotopia is prominent below the frontal and parietal neocortices but is rarely observed in temporal neocortex. Neurons in the heterotopia exhibit neocortical-like morphologies and send typical projections to subcortical sites; however, characteristic lamination and radial orientation are disturbed in the heterotopia. The period of neurogenesis during which cells in the heterotopia are generated is the same as in the normotopic neocortex; however, the cells in the heterotopia exhibit a "rim-to-core" neurogenetic pattern rather than the characteristic "inside-out" pattern observed in normotopic neocortex. Similar to the human syndrome of double cortex, some of the animals with the tish phenotype exhibit spontaneous recurrent electrographic and behavioral seizures.

The tish rat is a unique neurological mutant that shares several features with a human cortical malformation associated with epilepsy. On the basis of its regional connectivity, histological composition, and period of neurogenesis, the heterotopic region in the tish rat is neocortical in nature. This neurological mutant represents a novel model system for investigating mechanisms of aberrant neocortical development and is likely to provide insights into the cellular and molecular events contributing to seizure development in dysplastic neocortex.

Key words: cortical heterotopia; epilepsy; neuronal migration disorder; double cortex; neurogenesis; rat

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