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The Missense Variant in the Signal Peptide of α-GLA Gene, c.13 A/G, Promotes Endoplasmic Reticular Stress and the Related Pathway's Activation.
- Source :
-
Genes [Genes (Basel)] 2024 Jul 19; Vol. 15 (7). Date of Electronic Publication: 2024 Jul 19. - Publication Year :
- 2024
-
Abstract
- Anderson-Fabry disease (AFD) is an X-linked multisystemic disorder with a heterogeneous phenotype, resulting from deficiency of the lysosomal enzyme α-galactosidase A (α-Gal A) and leading to globotriaosylceramide systemic accumulation. Lysosomal storage is not the unique player in organ failure and different mechanisms could drive tissue damage, including endoplasmic reticulum (ER) stress and its related signaling pathway's activation. We identified a new missense variant in the signal peptide of α-GLA gene, c.13 A/G, in a 55-year-old woman affected by chronic kidney disease, acroparesthesia, hypohidrosis, and deafness and exhibiting normal values of lysoGb3 and αGLA activity. The functional study of the new variant performed by its overexpression in HEK293T cells showed an increased protein expression of a key ER stress marker, GRP78, the pro-apoptotic BAX, the negative regulator of cell cycle p21, the pro-inflammatory cytokine, IL1β, together with pNFkB, and the pro-fibrotic marker, N-cadherin. Transmission electron microscopy showed signs of ER injury and intra-lysosomal inclusions. The proband's PBMC exhibited higher expression of TGFβ 1 and pNFkB compared to control. Our findings suggest that the new variant, although it did not affect enzymatic activity, could cause cellular damage by affecting ER homeostasis and promoting apoptosis, inflammation, and fibrosis. Further studies are needed to demonstrate the variant's contribution to cellular and tissue damage.
- Subjects :
- Humans
Female
Middle Aged
HEK293 Cells
Protein Sorting Signals genetics
Fabry Disease genetics
Fabry Disease metabolism
Fabry Disease pathology
Signal Transduction genetics
Endoplasmic Reticulum Stress genetics
Mutation, Missense
Endoplasmic Reticulum Chaperone BiP
alpha-Galactosidase genetics
alpha-Galactosidase metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 2073-4425
- Volume :
- 15
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Genes
- Publication Type :
- Academic Journal
- Accession number :
- 39062726
- Full Text :
- https://doi.org/10.3390/genes15070947