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Mutations of the  SCN2A  gene, encoding the voltage gated sodium channel Na V 1.2, have been associated to a wide spectrum of epileptic disorders ranging from benign familial neonatal-infantile seizures to early onset epileptic encephalopathies such as Ohtahara syndrome. These phenotypes may be caused by either gain-of-function or loss-of-function mutations. More recently, loss-of-function  SCN2A  mutations have also been identified in patients with autism spectrum disorder (ASD) without overt epileptic phenotypes. Heterozygous  Scn2a  knock-out mice ( Scn2a  +/− ) may be a model of this phenotype. Because ASD develops in childhood, we performed a detailed behavioral characterization of  Scn2a  +/−  mice comparing the juvenile/adolescent period of development and adulthood. We used tasks relevant to ASD and the different comorbidities frequently found in this disorder, such as anxiety or intellectual disability. Our data demonstrate that young  Scn2a  +/−  mice display autistic-like phenotype associated to impaired memory and reduced reactivity to stressful stimuli. Interestingly, these dysfunctions are attenuated with age since adult mice show only communicative deficits. Considering the clinical data available on patients with loss-of-function  SCN2A  mutations, our results indicate that  Scn2a  +/−  mice constitute an ASD model with construct and face validity during the juvenile/adolescent period of development. However, more information about the clinical features of adult carriers of  SCN2A  mutations is needed to evaluate comparatively the phenotype of adult  Scn2a  +/−  mice.

NaV1.2 haploinsufficiency in Scn2a knock-out mice causes an autistic-like phenotype attenuated with age