De novo mutation in SLC25A22 gene: expansion of the clinical and electroencephalographic phenotype.

The SLC25A22 (Solute Carrier Family 25, Member 22) gene encodes for a mitochondrial glutamate/H+ symporter and is involved in the mitochondrial transport of metabolites across the mitochondrial membrane. We hereby report a 12-year-old girl presenting with early-onset epileptic encephalopathy, hypotonia, and global developmental delay. Whole exome sequencing identified a novel homozygous missense mutation in SLC25A22 gene (c.97A>G; p.Lys33Glu), as the likely cause of the disease. The phenotype of our patient and EEG recordings do not completely overlap with the phenotypes previously described, leading to a new and more complex form of disease associated with SLC25A22 variants, characterized by dyskinetic movements and oculogyric crisis.

Citation

Antonio Gennaro Nicotera, Daniela Dicanio, Erica Pironti, Maria Bonsignore, Anna Cafeo, Stephanie Efthymiou, Patrizia Mondello, Vincenzo Salpietro, Henry Houlden, Gabriella Di Rosa. De novo mutation in SLC25A22 gene: expansion of the clinical and electroencephalographic phenotype. Journal of neurogenetics. 2021 Mar-Jun;35(2):67-73

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PMID: 33821742

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