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A Novel Missense Mutation in LIS1 in a Child With Subcortical Band Heterotopia and Pachygyria Inherited From His Mildly Affected Mother With Somatic Mosaicism
Aleksandra Mineyko, MD1*,
Asif Doja, MD1,
Julie Hurteau, MD2,
William B. Dobyns, MD, PhD3,
Soma Das, PhD3,
and
Kym M. Boycott, MD, PhD4
1 Department of Pediatrics, Division of Neurology, Children’s Hospital of Eastern Ontario, Ottawa, Canada
2 Department of Radiology, Children’s Hospital of Eastern Ontario, Ottawa, Canada
3 Department of Human Genetics, University of Chicago, Illinois
4 Department of Genetics, Children’s Hospital of Eastern Ontario, Ottawa, Canada
* To whom correspondence should be addressed. E-mail: amineyko{at}cheo.on.ca.
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Abstract |
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Mutations in the LIS1 gene result in isolated lissencephaly or subcortical band heterotopia. We report a 5-year-old male who presented with seizures and global developmental delay. Magnetic resonance imaging (MRI) demonstrated posteriorly predominant pachygyria and subcortical band heterotopia. His mother had a history of epilepsy, with onset in her teenage years. Her MRI revealed no abnormalities. Sequence analysis of the LIS1 gene identified a novel p.H389Y mutation in exon 11 (c.1165C>T). The child’s mother was found to have the identical mutation as her son, with the signal intensity of the mutant allele being much lower than the normal allele, suggesting somatic mosaicism. This patient is one of only a few reported with a missense mutation in LIS1 associated with subcortical band heterotopia, and this is the first report of a mosaic individual having an affected child.
First published on October 6, 2009
Journal of Child Neurology 2009, doi:10.1177/0883073809343312
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