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the National Institutes of Health","award":["P30CA034196"],"award-info":[{"award-number":["P30CA034196"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>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, Dpagt1tvrm76 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.<\/jats:p>","DOI":"10.3390\/ijms231912005","type":"journal-article","created":{"date-parts":[[2022,10,9]],"date-time":"2022-10-09T20:49:31Z","timestamp":1665348571000},"page":"12005","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A Dpagt1 Missense Variant Causes Degenerative Retinopathy without Myasthenic Syndrome in Mice"],"prefix":"10.3390","volume":"23","author":[{"given":"Lillian F.","family":"Hyde","sequence":"first","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Kong","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"},{"name":"The Graduate School of Biomedical Science and Engineering, University of Maine, Orono, ME 04469, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lihong","family":"Zhao","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1029-1051","authenticated-orcid":false,"given":"Sriganesh Ramachandra","family":"Rao","sequence":"additional","affiliation":[{"name":"Departments of Ophthalmology and Biochemistry and Neuroscience Graduate Program, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14203, USA"},{"name":"Research Service, VA Western New York Healthcare System, Buffalo, NY 14215, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jieping","family":"Wang","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3998-9579","authenticated-orcid":false,"given":"Lisa","family":"Stone","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew","family":"Njaa","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gayle B.","family":"Collin","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9017-6066","authenticated-orcid":false,"given":"Mark P.","family":"Krebs","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8259-7290","authenticated-orcid":false,"given":"Bo","family":"Chang","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2557-142X","authenticated-orcid":false,"given":"Steven J.","family":"Fliesler","sequence":"additional","affiliation":[{"name":"Departments of Ophthalmology and Biochemistry and Neuroscience Graduate Program, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14203, USA"},{"name":"Research Service, VA Western New York Healthcare System, Buffalo, NY 14215, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1640-5945","authenticated-orcid":false,"given":"Patsy M.","family":"Nishina","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8213-0869","authenticated-orcid":false,"given":"J\u00fcrgen K.","family":"Naggert","sequence":"additional","affiliation":[{"name":"The Jackson Laboratory, Bar Harbor, ME 04609, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"466","DOI":"10.1016\/j.tig.2018.03.002","article-title":"Perspectives on Glycosylation and Its Congenital Disorders","volume":"34","author":"Ng","year":"2018","journal-title":"Trends Genet."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"303","DOI":"10.1186\/s13023-022-02460-0","article-title":"Stakeholders\u2019 views on drug development: The congenital disorders of glycosylation community perspective","volume":"17","author":"Monticelli","year":"2022","journal-title":"Orphanet. 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