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The  WWOX  gene has a WW domain containing oxidoreductase, which is located at the common fragile site FRA16D at chromosome 16q23.  WWOX  is a tumor suppressor gene that has been associated with several types of cancer such as hepatic, breast, lung, prostate, gastric, and ovarian. Recently WWOX has been implicated in epilepsy, where studies show homozygous loss-of-function mutation lead to early-infantile epileptic encephalopathy, spinocerebellar ataxia, intractable seizures and developmental delay, and early lethal microcephaly syndrome with epilepsy. Here we investigate two consanguineous Saudi families and we identified three probands with epileptic encephalopathy. Whole exome sequencing revealed a novel homozygous mutation in the  WWOX  gene in one proband. In addition, we identified a previously reported  WWOX  mutation in two probands. Later on these findings were confirmed with Sanger sequencing. The underlying mechanism on how WWOX mutations lead to seizure remains elusive. To date very few  WWOX  mutations have been associated with neurological disorder and our newly identified mutations support the notion that WWOX play an important role in neurons and will aid in better diagnosis and genetic counseling.

Novel homozygous mutation in the WWOX gene causes seizures and global developmental delay: Report and review