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Clinical and molecular heterogeneity in CDLK5 disorders.
BACKGROUND: CDKL5 deficiency syndrome is caused by pathogenic variants in the CDKL5 gene, with a variable clinical spectrum ranging from patients with characteristics of autism spectrum disorder to early-onset epilepsy refractory to treatment. Initially, until the gene was discovered, it was considered an atypical form of Rett syndrome. This study aimed to describe the clinical and molecular heterogeneity in CDLK5 disorders among three female patients with CDKL5 pathogenic variants.
CASE REPORTS: We reported three unrelated Mexican female patients evaluated for global developmental delay and epilepsy. All three cases were hemizygotes to a CDKL5 pathogenic variant. In one patient, we performed a 306 gene panel associated with epilepsy. In the other two cases, a human genomic microarray was performed. We describe their clinical features electroencephalogram and brain magnetic resonance evaluations.
CONCLUSIONS: CDKL5 deficiency syndrome represents a challenge for clinicians since the clinical manifestations, electroencephalographic and neuroimaging studies can be non-specific. This syndrome should be suspected in the presence of global developmental delay, autistic behavioral phenotype and epilepsy, associated or not with dysmorphia. Given the similarity between various epileptic encephalopathies, multigene panels including sequencing and duplication/deletion analysis should be requested in which this gene and its possible differential diagnoses are considered, without forgetting the usefulness of genomic techniques in unclear cases.
CASE REPORTS: We reported three unrelated Mexican female patients evaluated for global developmental delay and epilepsy. All three cases were hemizygotes to a CDKL5 pathogenic variant. In one patient, we performed a 306 gene panel associated with epilepsy. In the other two cases, a human genomic microarray was performed. We describe their clinical features electroencephalogram and brain magnetic resonance evaluations.
CONCLUSIONS: CDKL5 deficiency syndrome represents a challenge for clinicians since the clinical manifestations, electroencephalographic and neuroimaging studies can be non-specific. This syndrome should be suspected in the presence of global developmental delay, autistic behavioral phenotype and epilepsy, associated or not with dysmorphia. Given the similarity between various epileptic encephalopathies, multigene panels including sequencing and duplication/deletion analysis should be requested in which this gene and its possible differential diagnoses are considered, without forgetting the usefulness of genomic techniques in unclear cases.
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