Early infantile-onset epileptic encephalopathy 28 due to a homozygous microdeletion involving the WWOX gene in a region of uniparental disomy.
Mariska DavidsThomas MarkelloLynne A WolfeXenia Chepa-LotreaCynthia J TifftWilliam A GahlMay Christine V MalicdanPublished in: Human mutation (2018)
The genetic etiologies of many rare disorders, including early infantile epileptic encephalopathies, are largely undiagnosed. A 6-year-old girl was admitted to the National Institutes of Health Undiagnosed Diseases Program with profound intellectual disability, infantile-onset seizures, chronic respiratory failure, facial dysmorphisms, skeletal abnormalities, and atrial septum defect. A large region of homozygosity was discovered on chromosome 16, spanning 16q22.1-16q24.3' caused by uniparental disomy (UPD) that included a maternally inherited homozygous microdeletion covering exon 6 of WWOX (NM_016373.3). mRNA expression analysis revealed that the deletion led to nonsense-mediated decay of the NM_016373.3 transcript; the exon 6 of an alternative transcript (NM_130791.3), lacking the short-chain dehydrogenase, was utilized. The microdeletion in WWOX explains the seizures and intellectual disability, while pathogenic variants in another gene, HSPG2, are likely responsible for the patient's skeletal abnormalities. This report describes a rare autosomal recessive disorder with multiple genetic etiologies, one of which involves UPD.
Keyphrases
- intellectual disability
- copy number
- genome wide
- autism spectrum disorder
- respiratory failure
- photodynamic therapy
- genome wide identification
- quality improvement
- light emitting
- extracorporeal membrane oxygenation
- dna methylation
- rna seq
- public health
- healthcare
- single cell
- mechanical ventilation
- atrial fibrillation
- mental health
- case report
- early onset
- risk assessment
- health information
- binding protein
- drug induced
- health promotion