Mutation in protein disulfide isomerase A3 causes neurodevelopmental defects by disturbing endoplasmic reticulum proteostasis
AuthorsBilches Medinas, Danilo
Saaranen, Mirva J
Wright, Madison T
Brown, Robert H
Ruddock, Lloyd W
Concha, Miguel L
Document TypeAccepted Manuscript
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AbstractRecessive gene mutations underlie many developmental disorders and often lead to disabling neurological problems. Here, we report identification of a homozygous c.170G>A (p.Cys57Tyr or C57Y) mutation in the gene coding for protein disulfide isomerase A3 (PDIA3, also known as ERp57), an enzyme that catalyzes formation of disulfide bonds in the endoplasmic reticulum, to be associated with syndromic intellectual disability. Experiments in zebrafish embryos show that PDIA3C57Y expression is pathogenic and causes developmental defects such as axonal disorganization as well as skeletal abnormalities. Expression of PDIA3C57Y in the mouse hippocampus results in impaired synaptic plasticity and memory consolidation. Proteomic and functional analyses reveal that PDIA3C57Y expression leads to dysregulation of cell adhesion and actin cytoskeleton dynamics, associated with altered integrin biogenesis and reduced neuritogenesis. Biochemical studies show that PDIA3C57Y has decreased catalytic activity and forms disulfide-crosslinked aggregates that abnormally interact with chaperones in the endoplasmic reticulum. Thus, rare disease gene variant can provide insight into how perturbations of neuronal proteostasis can affect the function of the nervous system.
SourceBilches Medinas D, Malik S, Yıldız-Bölükbaşı E, Borgonovo J, Saaranen MJ, Urra H, Pulgar E, Afzal M, Contreras D, Wright MT, Bodaleo F, Quiroz G, Rozas P, Mumtaz S, Díaz R, Rozas C, Cabral-Miranda F, Piña R, Valenzuela V, Uyan O, Reardon C, Woehlbier U, Brown RH, Sena-Esteves M, Gonzalez-Billault C, Morales B, Plate L, Ruddock LW, Concha ML, Hetz C, Tolun A. Mutation in protein disulfide isomerase A3 causes neurodevelopmental defects by disturbing endoplasmic reticulum proteostasis. EMBO J. 2022 Dec 17;41(2):e105531. doi: 10.15252/embj.2020105531. Epub 2021 Dec 14. PMID: 34904718; PMCID: PMC8762563.
Permanent Link to this Itemhttp://hdl.handle.net/20.500.14038/51939
Rights© 2021 The Authors. Accepted manuscript posted after 6-month embargo as allowed by the publisher's author self-archiving policy at https://www.embopress.org/page/journal/14602075/authorguide#openaccessandarchiving.
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