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Genome-wide DNA methylation study of hip and knee osteoarthritic and healthy cartilage reveals embryonic organ and skeletal system morphogenesis as major pathways involved in osteoarthritis

ABSTRACT: Cartilage samples were collected from hip or knee joint replacement patients either due to primary OA or hip fractures as controls. DNA was extracted from the collected cartilage and assayed by Illumina Infinium HumanMethylation450 ‎BeadChip array, which allows for the analysis of >480,000 CpG sites.

ORGANISM(S): Homo sapiens

PROVIDER: GSE73626 | GEO | 2016/07/01

SECONDARY ACCESSION(S): PRJNA297447

REPOSITORIES: GEO

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Genome-wide DNA methylation study of hip and knee osteoarthritic and healthy cartilage reveals embryonic organ and skeletal system morphogenesis as major pathways involved in osteoarthritis

Project description:Cartilage samples were collected from hip or knee joint replacement patients either due to primary OA or hip fractures as controls. DNA was extracted from the collected cartilage and assayed by Illumina Infinium HumanMethylation450 âBeadChip array, which allows for the analysis of >480,000 CpG sites. Bisulphite converted DNA from 5 hip osteoarthritic, 6 knee osteoarthritic and 7 hip healhty cartilage samples were hybridised to the Illumina Infinium HumanMethylation450 âBeadChip array

2016-07-01 | E-GEOD-73626 | biostudies-arrayexpress

Characterization of the cartilage DNA methylome in knee and hip osteoarthritis.

Project description:The aim of this study was to characterise the genome-wide DNA methylation profile of osteoathritis (OA) chondrocytes from both knee and hip cartilage, providing the first comparison of DNA methylation between OA and non-OA hip cartilage, and between OA hip and OA knee cartilage. The study was performed using the Illumina Infinium HumanMethylation450 BeadChip array. Genome-wide methylation was assesed in chondrocyte DNA extracted from 23 OA hip, 73 OA knee and 21 healthy hip controls (NOF - neck of femure samples). Keywords: Methylation profiling by array

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Project description:Large scale RNA-Seq analysis was performed to investigate the transcriptomic response to osteoarthritis in cartilage and investigate potential subgroups of patients. Data were collected from intact knee cartilage (posterior lateral condyle) from at total of 60 patients with osteoarthritis (OA) following total knee replacement and 10 control non-OA patients following amputation.

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Project description:We have performed a peptidomic strategy to identify endogenous peptides (neopeptides) that are released from knee and/or hip OA cartilage, which may serve as disease markers.

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Project description:The pathogenesis of necrosis of femoral head (NFH) remains elusive now. Limited studies were conducted to investigate the molecular mechanism of hip articular cartilage damage of NFH. We conducted a genome-wide gene expression profiling of hip articular cartilage with NFH. Hip articular cartilage specimens were collected from 12 NFH patients and 12 healthy controls. Gene expression profiling of NFH articular cartilage was carried out by Agilent Human 4x44K Gene Expression Microarray chip. Differently expressed genes were identified using the Significance Analysis of Microarrays (SAM) software.

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Project description:Cartilage destruction in osteoarthritis (OA) results from disturbed chondrocyte metabolism. Here, we used microarrays to show that TGF alpha and CCL2 are simultaneously upregulated in a rat model of OA and cooperate to drive cartilage degradation. The goals of the experiments included here were to a) characterize gene expression in knee joint articular chondrocytes at various stages of development of OA (2 and 8 weeks after surgical induction of OA), and b) to establish trends in gene expression among groups of genes related to the TGF alpha-EGFR axis, over time, in OA. The model chosen to study these results has been previously validated (Appleton, CT et al, 2007, Arthritis Rheum) and used to describe similar gene expression results at a different time point (4 weeks) after induction of OA. The rat model of OA involves surgical destabilization of the knee joint, followed by forced low-intensity mobilization over several weeks; a sham surgery is used as the control (representing a healthy non-OA knee joint) wherein a surgical incision is made but not structural (i.e. ligamentous) modification is made to the joint. Altogether, our data indicate that TGF and CCL2 cooperate to drive cartilage degradation in osteoarthritis. A total of 12 samples were analyzed. 3 replicates were used per condition: OA surgery at 2 weeks, OA surgery at 8 weeks, Sham (control) surgery at 2 weeks and Sham surgery at 8 weeks. Expression of OA samples was assessed relaitve to Sham (control) expression levels.

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Osteoarthritis-related changes in gene expression in knee articular chondrocytes in a rat model of osteoarthritis.

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