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Osteogenesis imperfecta

ABSTRACT: Sequencing of a Fleckvieh animal for dominant Osteogensis imperfecta

PROVIDER: PRJEB12324 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR1201045.fastq.gz	Fastqsanger.gz
	ERR1201045_1.fastq.gz	Fastqsanger.gz
	ERR1201045_2.fastq.gz	Fastqsanger.gz

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Osteogenesis imperfecta in Holstein cattle

Project description:Osteogenesis imperfecta in an embryo transfer Holstein calf

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XBP1s-Mediated Endoplasmic Reticulum Proteostasis Network Enhancement Can Selectively Improve Folding and Secretion of an Osteogenesis Imperfecta-Causing Collagen-I Variant

Project description:Osteogenesis imperfecta (OI) is most commonly caused by autosomal dominant mutations in genes encoding collagen type-I. Here, we test the hypothesis that modulation of the endoplasmic reticulum (ER) proteostasis network via the unfolded protein response (UPR) can improve the folding and secretion of the lethal osteogenesis imperfecta (OI)-causing G425S a1(I) variant. We show that specific induction of the UPR’s XBP1s transcriptional response enhances G425S a1(I) secretion up to ~300% of basal levels. Notably, the effect is selective – WT a1(I) secretion is unaltered by XBP1s. XBP1s pathway activation appears to post-translationally enhance the folding/assembly and secretion of G425S a1(I). Consistent with this notion, we find that the stable, triple-helical collagen-I secreted by XBP1s-activated G425S a1(I) patient fibroblasts includes a higher proportion of the mutant a1(I) polypeptide than the collagen-I secreted under basal ER proteostasis conditions.

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Effect of Sclerostin Inactivation in a Mouse Model of Severe Dominant Osteogenesis Imperfecta

Project description:Effect of Sclerostin Inactivation in a Mouse Model of Severe Dominant Osteogenesis Imperfecta

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Multi-Omic analyses reveal aberrant differentiation trajectory with WNT1 Loss-of-Function in type XV osteogenesis imperfecta

Project description:Osteogenesis imperfecta (OI) is a serious genetic bone disorder characterized by congenital low bone mass, deformity and frequent fractures. Type XV OI is a moderate to severe form of skeletal dysplasia caused by WNT1 mutations. In this cohort study from southern China, we summarized the clinical phenotypes of patients with WNT1 mutations and found the proportion of type XV patients was around 10.3% (25 out of 243) with diverse phenotypic spectrums. Functional assays indicated that mutations of WNT1 significantly impaired its secretion and effective activity, leading to moderate to severe clinical manifestations, porous bone structure and enhanced osteoclastic activities. Analysis of proteomic data from human skeleton indicated that the expression of SOST was dramatically reduced in type XV patients. Single-cell transcriptome data generated from human tibia samples revealed aberrant differentiation trajectory of skeletal progenitors and impaired maturation of osteocytes, resulting in excessive CXCL12+ progenitors and abnormal cell populations with adipogenic characteristics. The integration of multi-omics data from human skeleton delineates how WNT1 regulates the differentiation and maturation of skeletal progenitors, which will provide a new direction for the treatment strategy of type XV osteogenesis imperfecta and relative low bone mass diseases such as early onset osteoporosis.

2024-10-17 | PXD050841 | Pride

OSTEOGENESIS IMPERFECTA

Project description:In this study, our objective is to broaden the understanding of the genetic and clinical characteristics of OI by investigating rare pathogenic variants (PVs) not only within the well-established COL1A1 and COL1A2, which are responsible for more than 85-90% of all cases but also in other genes involved in OI. To achieve this, we performed next-generation sequencing (NGS) analysis on OI patients from the Puglia Region in South Italy, a population with limited genetic data on OI

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Trancsriptomic analyses reveal aberrant differentiation trajectory with WNT1 Loss-of-Function in type XV osteogenesis imperfecta

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A Progeroid Syndrome with Severe Osteogenesis Imperfecta segregates with an Intronic TAPT1 homozygous Variant that Creates a knockout allele [RNA-seq]

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Multi-Omic analyses reveal aberrant differentiation trajectory with WNT1 Loss-of-Function in type XV osteogenesis imperfecta

2024-08-13 | GSE262091 | GEO

The IFITM5 mutation in osteogenesis imperfecta type V is associated with an ERK/SOX9-dependent osteoprogenitor differentiation defect

Project description:Osteogenesis imperfecta (OI) type V is the second most common form of OI, distinguished by hyperplastic callus formation and calcification of the interosseous membranes in addition to bone fragility. All patients carry a dominant pathogenic variant (c.-14C>T) in IFITM5. Here, we generated a conditional Rosa26 knock-in mouse model to study the mechanistic consequences of the recurrent mutation. Expression of the mutant Ifitm5 in osteo-chondroprogenitor or chondrogenic cells resulted in low bone mass and growth retardation. Mutant limbs showed impaired endochondral ossification, cartilage overgrowth, and abnormal growth plate architecture. The cartilage phenotype correlates with the pathology reported in OI type V patients. Surprisingly, expression of mutant Ifitm5 in matrix-synthesizing or mature osteoblasts caused no obvious skeletal abnormalities. In contrast, earlier expression in osteo-chondroprogenitors was associated with increase in the skeletal progenitor population within the periosteum. Mutant IFITM5 disrupts early skeletal homeostasis in part by activating ERK signaling and downstream SOX9 protein, and inhibition of these pathways partially rescued the phenotype in mutant animals. . Tracing of chondrogenic cells expressing the mutant Ifitm5 using the Ai9 reporter showed retention of Ai9+ cells in the growth plate and delayed migration to the bone shaft. RNA sequencing demonstrated enrichment for chondrogenic markers in the bone. These data identify the contribution of a defect in osteo-chondroprogenitor differentiation and not osteoblast function as a driver in the pathogenesis of OI type V.

2024-07-23 | GSE268601 | GEO

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