Familial cortical dysplasia caused by mutation in the mammalian target of rapamycin regulator NPRL3

We describe first cousin sibling pairs with focal epilepsy, one of each pair having focal cortical dysplasia (FCD) IIa. Linkage analysis and whole‐exome sequencing identified a heterozygous germline frameshift mutation in the gene encoding nitrogen permease regulator‐like 3 (NPRL3). NPRL3 is a component of GAP Activity Towards Rags 1, a negative regulator of the mammalian target of rapamycin complex 1 signaling pathway. Immunostaining of resected brain tissue demonstrated mammalian target of rapamycin activation. Screening of 52 unrelated individuals with FCD identified 2 additional patients with FCDIIa and germline NPRL3 mutations. Similar to DEPDC5, NPRL3 mutations may be considered as causal variants in patients with FCD or magnetic resonance imaging–negative focal epilepsy. Ann Neurol 2015

Source: Annals of Neurology - December 12, 2015 Category: Neurology Authors: Joe C. Sim, Thomas Scerri, Miriam Fanjul‐Fernández, Jessica R. Riseley, Greta Gillies, Kate Pope, Hanna van Roozendaal, Julian I. Heng, Simone A. Mandelstam, George McGillivray, Duncan MacGregor, Lakshminarayanan Kannan, Wirginia Maixner, A. Simon Harv Tags: Brief Communication Source Type: research