Biallelic truncating variants in ATP9A cause a novel neurodevelopmental disorder involving postnatal microcephaly and failure to thrive

Vogt, G.; Verheyen, S.; Schwartzmann, S.; Ehmke, N.; Potratz, C.; Schwerin-Nagel, A.; Plecko, B.; Holtgrewe, M.; Seelow, D.; Blatterer, J.; Speicher, M.R.; Kornak, U.; Horn, D.; Mundlos, S.; Fischer-Zirnsak, B.; Boschann, F.

Biallelic truncating variants in ATP9A cause a novel neurodevelopmental disorder involving postnatal microcephaly and failure to thrive

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Item Type:	Article
Title:	Biallelic truncating variants in ATP9A cause a novel neurodevelopmental disorder involving postnatal microcephaly and failure to thrive
Creators Name:	Vogt, G., Verheyen, S., Schwartzmann, S., Ehmke, N., Potratz, C., Schwerin-Nagel, A., Plecko, B., Holtgrewe, M., Seelow, D., Blatterer, J., Speicher, M.R., Kornak, U., Horn, D., Mundlos, S., Fischer-Zirnsak, B. and Boschann, F.
Abstract:	BACKGROUND: Genes implicated in the Golgi and endosomal trafficking machinery are crucial for brain development, and mutations in them are particularly associated with postnatal microcephaly (POM). METHODS: Exome sequencing was performed in three affected individuals from two unrelated consanguineous families presenting with delayed neurodevelopment, intellectual disability of variable degree, POM and failure to thrive. Patient-derived fibroblasts were tested for functional effects of the variants. RESULTS: We detected homozygous truncating variants in ATP9 A. While the variant in family A is predicted to result in an early premature termination codon, the variant in family B affects a canonical splice site. Both variants lead to a substantial reduction of ATP9A mRNA expression. It has been shown previously that ATP9A localises to early and recycling endosomes, whereas its depletion leads to altered gene expression of components from this compartment. Consistent with previous findings, we also observed overexpression of ARPC3 and SNX3, genes strongly interacting with ATP9A: CONCLUSION: In aggregate, our findings show that pathogenic variants in ATP9A cause a novel autosomal recessive neurodevelopmental disorder with POM. While the physiological function of endogenous ATP9A is still largely elusive, our results underline a crucial role of this gene in endosomal transport in brain tissue.
Keywords:	Adenosine Triphosphatases, Failure to Thrive, Homozygote, Intellectual Disability, Membrane Transport Proteins, Microcephaly, Nervous System Malformations, Neurodevelopmental Disorders, Pedigree
Source:	Journal of Medical Genetics
ISSN:	1468-6244
Publisher:	BMJ Publishing Group
Volume:	59
Number:	7
Page Range:	662-668
Number of Pages:	7
Date:	July 2022
Official Publication:	https://doi.org/10.1136/jmedgenet-2021-107843
PubMed:	View item in PubMed

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