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Ann Neurol. 2009 Jun;65(6):748-53. doi: 10.1002/ana.21625.

De novo STXBP1 mutations in mental retardation and nonsyndromic epilepsy.

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  • 1Centre of Excellence in Neuromics of Université de Montréal and Synapse to Disease Group, Centre Hospitalier Universitaire Sainte-Justine Research Center, Université de Montréal, Montreal, Quebec, Canada.


We sequenced genes coding for components of the SNARE complex (STX1A, VAMP2, SNAP25) and their regulatory proteins (STXBP1/Munc18-1, SYT1), which are essential for neurotransmission, in 95 patients with idiopathic mental retardation. We identified de novo mutations in STXBP1 (nonsense, p.R388X; splicing, c.169+1G>A) in two patients with severe mental retardation and nonsyndromic epilepsy. Reverse transcriptase polymerase chain reaction and sequencing showed that the splicing mutation creates a stop codon downstream of exon-3. No de novo or deleterious mutations in STXBP1 were found in 190 control subjects, or in 142 autistic patients. These results suggest that STXBP1 disruption is associated with autosomal dominant mental retardation and nonsyndromic epilepsy.

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