Neuropathology of 16p13.11 deletion in epilepsy

Liu, J.Y.W., Kasperavičiute, D., Martinian, L., Thom, M. and Sisodiya, S.M. 2012. Neuropathology of 16p13.11 deletion in epilepsy. PLoS ONE. 7 (4). https://doi.org/10.1371/journal.pone.0034813

TitleNeuropathology of 16p13.11 deletion in epilepsy
TypeJournal article
AuthorsLiu, J.Y.W., Kasperavičiute, D., Martinian, L., Thom, M. and Sisodiya, S.M.
Abstract

16p13.11 genomic copy number variants are implicated in several neuropsychiatric disorders, such as schizophrenia, autism, mental retardation, ADHD and epilepsy. The mechanisms leading to the diverse clinical manifestations of deletions and duplications at this locus are unknown. Most studies favour NDE1 as the leading disease-causing candidate gene at 16p13.11. In epilepsy at least, the deletion does not appear to unmask recessive-acting mutations in NDE1, with haploinsufficiency and genetic modifiers being prime candidate disease mechanisms. NDE1 encodes a protein critical to cell positioning during cortical development. As a first step, it is important to determine whether 16p13.11 copy number change translates to detectable brain structural alteration. We undertook detailed neuropathology on surgically resected brain tissue of two patients with intractable mesial temporal lobe epilepsy (MTLE), who had the same heterozygous NDE1-containing 800 kb 16p13.11 deletion, using routine histological stains and immunohistochemical markers against a range of layer-specific, white matter, neural precursor and migratory cell proteins, and NDE1 itself. Surgical temporal lobectomy samples from a MTLE case known not to have a deletion in NDE1 and three non-epilepsy cases were included as disease controls. We found that apart from a 3 mm hamartia in the temporal cortex of one MTLE case with NDE1 deletion and known hippocampal sclerosis in the other case, cortical lamination and cytoarchitecture were normal, with no differences between cases with deletion and disease controls. How 16p13.11 copy changes lead to a variety of brain diseases remains unclear, but at least in epilepsy, it would not seem to be through structural abnormality or dyslamination as judged by microscopy or immunohistochemistry. The need to integrate additional data with genetic findings to determine their significance will become more pressing as genetic technologies generate increasingly rich datasets. Detailed examination of brain tissue, where available, will be an important part of this process in neurogenetic disease specifically.

JournalPLoS ONE
Journal citation7 (4)
ISSN1932-6203
Year2012
PublisherPLoS
Publisher's version
License
CC BY 4.0
File Access Level
Open (open metadata and files)
Digital Object Identifier (DOI)https://doi.org/10.1371/journal.pone.0034813
Web address (URL)http://www.scopus.com/inward/record.url?eid=2-s2.0-84859809937&partnerID=MN8TOARS
Publication dates
Published16 Apr 2012

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