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Mol Syndromol ; 12(4): 234-239, 2021 Jul.
Article in English | MEDLINE | ID: mdl-34421501

ABSTRACT

Many neurodevelopmental disorders are caused by the presence of CNVs. Chromosome microarray technology is widely used to accurately detect CNVs. We report the case of a male, aged 3 years, presenting with delayed psychomotor development, generalized hypotonia, encephalopathy, delayed myelination in the central nervous system, and poor motor coordination. The array CGH revealed an interstitial deletion of chromosome 19q13.2 with a size of 88.8 kb involving 3 OMIM genes: RABAC1, ARHGEF1, and ATP1A3. Heterozygous mutations in the ATP1A3 gene are associated with delayed psychomotor development, alternating hemiplegia of childhood type 2 (AHC2), dystonia type 12, and cerebellarataxia-areflexia-pes cavus-optic atrophy-sensorineural hearing loss syndrome, also called CAPOS syndrome. The phenotypic expression of partial ATP1A3 deletion is, however, poorly described in the literature. The deletion was confirmed by MLPA, and we identified a hitherto undescribed novel deletion of exons 3b-21 of the ATP1A3 gene. Our data suggest that the deletion of the ATP1A3 gene is a causative factor of the AHC2 phenotype in the patient.

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