Abstract:
:We set out to review the extent to which molecular karyotyping has overtaken conventional cytogenetics in applications related to epilepsy. Multiplex ligase-dependent probe amplification (MLPA) targeted to predetermined regions such as SCN1A and KCNQ2 has been effectively applied over the last half a decade, and oligonucleotide array comparative genome hybridization (array CGH) is now well established for genome-wide exploration of microchromosomal variation. Array CGH is applicable to the characterization of lesions present in both sporadic and familial epilepsy, especially where clinical features of affected cases depart from established syndromes. Copy number variants (CNVs) associated with epilepsy and a range of other syndromes and conditions can be recurrent due to nonallelic homologous recombination in regions of segmental duplication. The most common of the recurrent microdeletions associated with generalized epilepsy are typically seen at a frequency of ∼ 1% at 15q13.3, 16p13.11, and 15q11.2, sites that also confer susceptibility for intellectual disability, autism, and schizophrenia. Incomplete penetrance and variable expressivity confound the established rules of cytogenetics for determining the pathogenicity for novel CNVs; however, as knowledge is gained for each of the recurrent CNVs, this is translated to genetic counseling. CNVs play a significant role in the susceptibility profile for epilepsies, with complex genetics and their comorbidities both from the "hotspots" defined by segmental duplication and elsewhere in the genome where their location and size are often novel.
journal_name
Epilepsiajournal_title
Epilepsiaauthors
Mulley JC,Mefford HCdoi
10.1111/j.1528-1167.2010.02932.xsubject
Has Abstractpub_date
2011-03-01 00:00:00pages
423-32issue
3eissn
0013-9580issn
1528-1167journal_volume
52pub_type
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