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Gene expression profiling of chondrodysplasia mutants and isogenic controls during hypertrophic induction from iPSCs

ABSTRACT: Gene expression profiling of chondrodysplasia mutants and isogenic controls during hypertrophic induction from iPSCs

PROVIDER: PRJNA625508 | ENA |

REPOSITORIES: ENA

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Gene expression profiling of chondrodysplasia mutants and isogenic controls during hypertrophic induction from iPSCs

Project description:In order to better understand chondrodysplasia disease mechanisms, we induced hypertrophic chondrocytes from chondrodysplasia-specific iPSCs and analyzed their gene expression profile. This dataset includes the expression data obtained from iPSC-derived cartilage pellets on day 56 of hypertrophic induction. Three COL10A1 mutants and two MATN3 mutants were compared to their isogenic controls to determine the effects of each mutation on the unfolded protein response.

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Project description:We set out to determine the role of the IRE1/XBP1 pathway, the most ancient and highly conserved endoplasmic reticulum (ER) stress-sensing pathway of the unfolded protein response (UPR), in Schmid metaphyseal chondrodysplasia (MCDS). RNA derived from hypertrophic zones microdissected from growth plates of wildtype mice, mice lacking XBP1 activity in chondrocytes (Xbp1Cart?Ex2), mice carrying a COL10A1 pN617K mutation (ColXN617K), and compound mutants (C/X) was analyzed by whole genome microarray analysis. 1633 probes were differentially expressed between ColXN617K and wildtype, 215 probes were differentially expressed between Xbp1Cart?Ex2 and wildtype, and 1337 probes were differentially expressed between C/X and wildtype. 885 probes were differentially expressed between ColXN617K and wildtype but not Xbp1Cart?Ex2 and wildtype or C/X and wildtype, thus representing the XBP1-dependent response to hypertrophic chondrocyte ER stress. 688 probes were differentially expressed between ColXN617K and wildtype and between C/X and wildtype but not Xbp1Cart?Ex2 and wildtype, thus representing the XBP1-independent response to hypertrophic chondrocyte ER stress. Results were validated by qPCR. Entire growth plate hypertrophic zones were microdissected from one tibia from each of three 2-week old wildtype mice, three 2-week old mice carrying a COL10A1 p.N617K mutation (ColXN617K), three 2-week old mice lacking XBP1 activity in chondrocytes (Xbp1Cart?Ex2), and three 2-week old mice resulting from a cross between ColXN617K and Xbp1Cart?Ex2 (C/X).

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Analysis of the IRE1/XBP1 unfolded protein response (UPR) pathway in Schmid metaphyseal chondrodysplasia hypertrophic chondrocyte endoplasmic reticulum (ER) stress

Project description:We set out to determine the role of the IRE1/XBP1 pathway, the most ancient and highly conserved endoplasmic reticulum (ER) stress-sensing pathway of the unfolded protein response (UPR), in Schmid metaphyseal chondrodysplasia (MCDS). RNA derived from hypertrophic zones microdissected from growth plates of wildtype mice, mice lacking XBP1 activity in chondrocytes (Xbp1CartΔEx2), mice carrying a COL10A1 pN617K mutation (ColXN617K), and compound mutants (C/X) was analyzed by whole genome microarray analysis. 1633 probes were differentially expressed between ColXN617K and wildtype, 215 probes were differentially expressed between Xbp1CartΔEx2 and wildtype, and 1337 probes were differentially expressed between C/X and wildtype. 885 probes were differentially expressed between ColXN617K and wildtype but not Xbp1CartΔEx2 and wildtype or C/X and wildtype, thus representing the XBP1-dependent response to hypertrophic chondrocyte ER stress. 688 probes were differentially expressed between ColXN617K and wildtype and between C/X and wildtype but not Xbp1CartΔEx2 and wildtype, thus representing the XBP1-independent response to hypertrophic chondrocyte ER stress. Results were validated by qPCR.

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