RESUMO
BACKGROUND: NEUROD2, encoding the neurogenic differentiation factor 2, is essential for neurodevelopment. To date, heterozygous missense variants in this gene have been identified in eight patients (from six unrelated families) with epileptic encephalopathy and developmental delay. CASE REPORT: We describe a child with initial clinical suspicion of Rett/Rett-like syndrome, in whom exome sequencing detected a novel de novo variant (c.388G > A, p.Glu130Lys) in NEUROD2. Interestingly, a missense change affecting the same codon, c.388G > C (p.Glu130Gln), was previously identified in other two patients. CONCLUSIONS: Our results suggest that Glu130 might represent a potential mutational hotspot of NEUROD2. Furthermore, the clinical findings (especially the absence of clinically overt seizures) strengthen the NEUROD2-phenotypic spectrum, implying that developmental delay may also manifest isolatedly. We suggest inclusion of NEUROD2-associated developmental and epileptic encephalopathies (DEEs) in the differential diagnosis of atypical Rett syndrome as well as gene panels related to autism spectrum disorder.
Assuntos
Transtorno do Espectro Autista , Epilepsia Generalizada , Deficiência Intelectual , Neuropeptídeos , Síndrome de Rett , Humanos , Transtorno do Espectro Autista/genética , Síndrome de Rett/diagnóstico , Síndrome de Rett/genética , Mutação/genética , Fenótipo , Códon , Epilepsia Generalizada/genética , Deficiência Intelectual/genética , Neuropeptídeos/genética , Fatores de Transcrição Hélice-Alça-Hélice Básicos/genéticaRESUMO
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