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A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice

Congenital disorders of glycosylation (CDG) are a heterogenous group of primarily autosomal recessive mendelian diseases caused by disruptions in the synthesis of lipid-linked oligosaccharides and their transfer to proteins. CDGs usually affect multiple organ systems and vary in presentation, even w...

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Autores principales: Hyde, Lillian F., Kong, Yang, Zhao, Lihong, Rao, Sriganesh Ramachandra, Wang, Jieping, Stone, Lisa, Njaa, Andrew, Collin, Gayle B., Krebs, Mark P., Chang, Bo, Fliesler, Steven J., Nishina, Patsy M., Naggert, Jürgen K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9570038/
https://www.ncbi.nlm.nih.gov/pubmed/36233305
http://dx.doi.org/10.3390/ijms231912005
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author Hyde, Lillian F.
Kong, Yang
Zhao, Lihong
Rao, Sriganesh Ramachandra
Wang, Jieping
Stone, Lisa
Njaa, Andrew
Collin, Gayle B.
Krebs, Mark P.
Chang, Bo
Fliesler, Steven J.
Nishina, Patsy M.
Naggert, Jürgen K.
author_facet Hyde, Lillian F.
Kong, Yang
Zhao, Lihong
Rao, Sriganesh Ramachandra
Wang, Jieping
Stone, Lisa
Njaa, Andrew
Collin, Gayle B.
Krebs, Mark P.
Chang, Bo
Fliesler, Steven J.
Nishina, Patsy M.
Naggert, Jürgen K.
author_sort Hyde, Lillian F.
collection PubMed
description Congenital disorders of glycosylation (CDG) are a heterogenous group of primarily autosomal recessive mendelian diseases caused by disruptions in the synthesis of lipid-linked oligosaccharides and their transfer to proteins. CDGs usually affect multiple organ systems and vary in presentation, even within families. There is currently no cure, and treatment is aimed at ameliorating symptoms and improving quality of life. Here, we describe a chemically induced mouse mutant, tvrm76, with early-onset photoreceptor degeneration. The recessive mutation was mapped to Chromosome 9 and associated with a missense mutation in the Dpagt1 gene encoding UDP-N-acetyl-D-glucosamine:dolichyl-phosphate N-acetyl-D-glucosaminephosphotransferase (EC 2.7.8.15). The mutation is predicted to cause a substitution of aspartic acid with glycine at residue 166 of DPAGT1. This represents the first viable animal model of a Dpagt1 mutation and a novel phenotype for a CDG. The increased expression of Ddit3, and elevated levels of HSPA5 (BiP) suggest the presence of early-onset endoplasmic reticulum (ER) stress. These changes were associated with the induction of photoreceptor apoptosis in tvrm76 retinas. Mutations in human DPAGT1 cause myasthenic syndrome-13 and severe forms of a congenital disorder of glycosylation Type Ij. In contrast, Dpagt1(tvrm76) homozygous mice present with congenital photoreceptor degeneration without overt muscle or muscular junction involvement. Our results suggest the possibility of DPAGT1 mutations in human patients that present primarily with retinitis pigmentosa, with little or no muscle disease. Variants in DPAGT1 should be considered when evaluating cases of non-syndromic retinal degeneration.
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spelling pubmed-95700382022-10-17 A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice Hyde, Lillian F. Kong, Yang Zhao, Lihong Rao, Sriganesh Ramachandra Wang, Jieping Stone, Lisa Njaa, Andrew Collin, Gayle B. Krebs, Mark P. Chang, Bo Fliesler, Steven J. Nishina, Patsy M. Naggert, Jürgen K. Int J Mol Sci Article Congenital disorders of glycosylation (CDG) are a heterogenous group of primarily autosomal recessive mendelian diseases caused by disruptions in the synthesis of lipid-linked oligosaccharides and their transfer to proteins. CDGs usually affect multiple organ systems and vary in presentation, even within families. There is currently no cure, and treatment is aimed at ameliorating symptoms and improving quality of life. Here, we describe a chemically induced mouse mutant, tvrm76, with early-onset photoreceptor degeneration. The recessive mutation was mapped to Chromosome 9 and associated with a missense mutation in the Dpagt1 gene encoding UDP-N-acetyl-D-glucosamine:dolichyl-phosphate N-acetyl-D-glucosaminephosphotransferase (EC 2.7.8.15). The mutation is predicted to cause a substitution of aspartic acid with glycine at residue 166 of DPAGT1. This represents the first viable animal model of a Dpagt1 mutation and a novel phenotype for a CDG. The increased expression of Ddit3, and elevated levels of HSPA5 (BiP) suggest the presence of early-onset endoplasmic reticulum (ER) stress. These changes were associated with the induction of photoreceptor apoptosis in tvrm76 retinas. Mutations in human DPAGT1 cause myasthenic syndrome-13 and severe forms of a congenital disorder of glycosylation Type Ij. In contrast, Dpagt1(tvrm76) homozygous mice present with congenital photoreceptor degeneration without overt muscle or muscular junction involvement. Our results suggest the possibility of DPAGT1 mutations in human patients that present primarily with retinitis pigmentosa, with little or no muscle disease. Variants in DPAGT1 should be considered when evaluating cases of non-syndromic retinal degeneration. MDPI 2022-10-09 /pmc/articles/PMC9570038/ /pubmed/36233305 http://dx.doi.org/10.3390/ijms231912005 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hyde, Lillian F.
Kong, Yang
Zhao, Lihong
Rao, Sriganesh Ramachandra
Wang, Jieping
Stone, Lisa
Njaa, Andrew
Collin, Gayle B.
Krebs, Mark P.
Chang, Bo
Fliesler, Steven J.
Nishina, Patsy M.
Naggert, Jürgen K.
A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice
title A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice
title_full A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice
title_fullStr A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice
title_full_unstemmed A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice
title_short A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice
title_sort dpagt1 missense variant causes degenerative retinopathy without myasthenic syndrome in mice
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9570038/
https://www.ncbi.nlm.nih.gov/pubmed/36233305
http://dx.doi.org/10.3390/ijms231912005
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