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• W4309455873 abstract "Background: Vascular-type Ehlers–Danlos syndrome (vEDS) is an autosomal dominant inherited disorder caused by a deficit in collagen III as a result of heterogeneous mutations in the α1 type III collagen gene ( COL3A1 ). Patients with vEDS often experience the first major complications in their early 20s and &gt;80% have at least one complication by their 40s, reducing their average life expectancy to 48 years. Most commonly, vEDS variants are heterozygous missense substitutions of a base-pair encoding a glycine (Gly) residue of the [Gly-X-Y] repeat of the COL3A1 protein. When a peptide chain derived from a mutant allele is present in the procollagen triple helical structure, the helical structure cannot be maintained. Therefore, typically, the mutated collagen peptide induces a dominant negative effect on procollagen production. We reported the case of a patient with vEDS and a unique novel duplication mutation without alteration in the [Gly-X-Y] triplet repeat sequence. Case presentation: A 58-year-old man developed a sudden disorder of consciousness and abdominal pain and was consequently taken to a nearby hospital, where an intra-abdominal aneurysm was found, in addition to mild small joint hypermobility and acrogeria. There has been no history of spontaneous pneumothorax, dislocation, or subcutaneous hematoma. The analysis of genomic DNA from a blood sample identified a likely pathogenic in-frame duplication mutation in the COL3A1 gene coding region. Interestingly, this mutation is not expected to alter the [Gly-X-Y] triplet repeat sequence. We verified the mutation’s pathogenicity by performing an analysis of synthetic procollagen from cultured skin fibroblasts, electron microscopy, and mRNA expression analysis of unfolded protein response sensors for endoplasmic reticulum (ER) stress. Conclusion: Although the clinical findings of the case were mild, when compared to typical vEDS, decreased α1 collagen III levels and morphological abnormalities of the collagenous bundles were observed in the patient samples when compared with the normal control samples. Our evidence supports the conclusion that this variant is pathogenic. However, unlike the common vEDS, ER stress was not observed, and the mild phenotype presentation was suggested to be due to the unique mutation, allowing the triple helical structure to be maintained to a certain extent." @default.
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• W4309455873 date "2022-11-18" @default.
• W4309455873 modified "2023-09-25" @default.
• W4309455873 title "Case report: Mild phenotype of a patient with vascular Ehlers–Danlos syndrome and COL3A1 duplication mutation without alteration in the [Gly-X-Y] repeat sequence" @default.
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• W4309455873 doi "https://doi.org/10.3389/fgene.2022.1017446" @default.
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