PI4K2A deficiency in an intellectual disability, epilepsy, myoclonus, akathisia syndrome

Area of Science:

• Neurogenetics
• Human Genetics
• Molecular Biology

Background:

• Global developmental delay, dystonia, disturbed sleep, and heat intolerance are complex symptoms that can indicate underlying genetic disorders.
• Identifying novel disease genes is crucial for understanding the genetic basis of neurological conditions and improving diagnostic capabilities.

Purpose of the Study:

• To identify the genetic cause of a neurological disorder in a consanguineous Saudi Arabian family.
• To investigate the role of the PI4K2A gene in human neurological development and disease.

Main Methods:

• Whole genome sequencing was performed on affected individuals and unaffected siblings from the family.
• Variant analysis focused on identifying homozygous mutations in affected individuals.
• Bioinformatic analysis and literature review were used to assess the pathogenicity of the identified variant.

Main Results:

• A homozygous nonsense variant in the first exon of the PI4K2A gene was identified in both affected children.
• This variant was absent or heterozygous in seven unaffected siblings, indicating segregation with the disease.
• PI4K2A is known to be highly expressed in the brain, and a mouse model exhibits a neurological phenotype.

Conclusions:

• The identified nonsense variant in PI4K2A is likely the causative mutation for the observed neurological disorder.
• This study implicates PI4K2A as a novel disease gene associated with global developmental delay, dystonia, and heat intolerance.
• Further research into the function of PI4K2A in the brain may reveal new therapeutic targets for neurological disorders.