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Case Reports
Journal Article
Research Support, Non-U.S. Gov't
Early-onset encephalopathy with epilepsy associated with a novel splice site mutation in SMC1A.
American Journal of Medical Genetics. Part A 2015 December
We report on the clinical and molecular characterization of a female patient with early-onset epileptic encephalopathy, who was found to carry a de novo novel splice site mutation in SMC1A. This girl shared some morphologic and anthropometric traits described in patients with clinical diagnosis of Cornelia de Lange syndrome and with SMC1A mutation but also has severe encephalopathy with early-onset epilepsy. In addition, she had midline hand stereotypies and scoliosis leading to the misdiagnosis of a Rett overlap syndrome. Molecular studies found a novel de novo splice site mutation (c.1911 + 1G > T) in SMC1A. This novel splice mutation was associated with an aberrantly processed mRNA that included intron 11 of the gene. Moreover, quantitative approach by RT-PCR showed a severe reduction of the SMC1A transcript suggesting that this aberrant transcript may be unstable and degraded. Taken together, our data suggest that the phenotype may be due to a loss-of-function of SMC1A in this patient. Our findings suggest that loss-of-function mutations of SMC1A may be associated with early-onset encephalopathy with epilepsy.
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