A novel NAA10 variant with impaired acetyltransferase activity causes developmental delay, intellectual disability, and hypertrophic cardiomyopathy

European Journal of Human Genetics : EJHG
Svein I StøveThomas Arnesen

Abstract

The NAA10-NAA15 complex (NatA) is an N-terminal acetyltransferase that catalyzes N-terminal acetylation of ~40% of all human proteins. N-terminal acetylation has several different roles in the cell, including altering protein stability and degradation, protein localization and protein-protein interactions. In recent years several X-linked NAA10 variants have been associated with genetic disorders. We have identified a previously undescribed NAA10 c.215T>C p.(Ile72Thr) variant in three boys from two unrelated families with a milder phenotypic spectrum in comparison to most of the previously described patients with NAA10 variants. These boys have development delay, intellectual disability, and cardiac abnormalities as overlapping phenotypes. Functional studies reveal that NAA10 Ile72Thr is destabilized, while binding to NAA15 most likely is intact. Surprisingly, the NatA activity of NAA10 Ile72Thr appears normal while its monomeric activity is decreased. This study further broadens the phenotypic spectrum associated with NAA10 deficiency, and adds to the evidence that genotype-phenotype correlations for NAA10 variants are much more complex than initially anticipated.

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Citations

Dec 10, 2019·Archives of Pharmacal Research·Prerna ChaudharyJi Hae Seo
Aug 31, 2020·Human Genome Variation·Ayumi ShishidoKazumoto Iijima
May 17, 2019·Case Reports in Genetics·Angela S GuptaNatario L Couser
Oct 27, 2020·American Journal of Medical Genetics. Part a·Alyssa RitterRebecca C Ahrens-Nicklas
Dec 2, 2020·International Journal of Molecular Sciences·Nina McTiernanThomas Arnesen
Jan 10, 2021·Human Genome Variation·Ayumi ShishidoKazumoto Iijima

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Methods Mentioned

BETA
acetylation
Human
Genome Sequencing
transfection
X-ray

Software Mentioned

Mercury
Variant Analyzer
ImageLab
ESPript3
ClinVar
VCRome
SIFT
ClustalX
gnomAD
PolyPhen

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