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Neuronal deficiency of ARV1 causes an autosomal recessive epileptic encephalopathy

Abstract

We report an individual who presented with severe neurodevelopmental delay and an intractable infantile-onset seizure disorder. Exome sequencing identified a homozygous single nucleotide change that abolishes a splice donor site in the ARV1 gene (c.294 + 1G > A homozygous). This variant completely prevented splicing in minigene assays, and resulted in exon skipping and an in-frame deletion of 40 amino acids in primary human fibroblasts (NP_073623.1: p.(Lys59_Asn98del). The p.(Lys59_Asn98del) and previously reported p.(Gly189Arg) ARV1 variants were evaluated for protein expression and function. The p.(Gly189Arg) variant partially rescued the temperature-dependent growth defect in arv1Delta yeast, while p.(Lys59-Asn98del) completely failed to rescue at restrictive temperature. In contrast to wild type human ARV1, neither variant expressed detectable levels of protein in mammalian cells. Mice with a neuronal deletion of Arv1 recapitulated the human phenotype, exhibiting seizures and a severe survival defect in adulthood. Our data support ARV1 deficiency as a cause of autosomal recessive epileptic encephalopathy.

Type Journal
ISBN 1460-2083 (Electronic) 0964-6906 (Linking)
Authors Palmer, E. E.; Jarrett, K. E.; Sachdev, R. K.; Al Zahrani, F.; Hashem, M. O.; Ibrahim, N.; Sampaio, H.; Kandula, T.; Macintosh, R.; Gupta, R.; Conlon, D. M.; Billheimer, J. T.; Rader, D. J.; Funato, K.; Walkey, C. J.; Lee, C. S.; Loo, C.; Brammah, S.; Elakis, G.; Zhu, Y.; Buckley, M.; Kirk, E. P.; Bye, A.; Alkuraya, F. S.; Roscioli, T.; Lagor, W
Publisher Name HUMAN MOLECULAR GENETICS
Published Date 2016-01-01 00:00:00
Published Volume 25
Published Issue 14
Published Pages 3042-3054
URL http://www.ncbi.nlm.nih.gov/pubmed/27270415
Status Published In-print
OpenAccess Link https://publications.gimr.garvan.org.au/download.php?13895_13653/2016-Palmer-Hum Mol Genet.pdf