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Analysis of transcriptomes of WT & XIST deficient type 1 conventional DCs in mice

ABSTRACT: Analysis of transcriptomes of WT & XIST deficient type 1 conventional DCs in mice

PROVIDER: PRJNA1113327 | ENA |

REPOSITORIES: ENA

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Analysis of transcriptomes of WT & XIST deficient type 1 conventional DCs in mice

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Analysis of chromatin accessibility of WT & XIST deficient type 1 conventional DCs in female mice

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Development of gene expression signatures for colonic lamina propria DCs of CD300a deficient mice

Project description:To further development of our gene expression approach to CD300a deficiency on dendritic cells (DCs) in colonic lamina propria, we have employed whole genome microarray expression profiling as a discovery platform to identify genes with the potential to distinguish CD300a deficiency on DCs in colonic lamina propria from those of WT mice. Colonic lamina propria DCs were obtained by cell sorter from WT and CD300a deficient mice raised under SPF and GF condition. Expression of Ifnb1 was significantly higher in CD300a deficient DCs, quantified in the same RNA samples by real-time PCR.

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Project description:Purpose: Compare the transcriptome of homogeneous XIST+ and XIST- hES cell populations. Methods: We isolated homogeneous XIST+ and XIST- cell populations. The XIST+ cells correspond to cells with a XIST cloud and one ATRX pinpoint. The XIST- cells correspond to cells with no XIST cloud and one ATRX pinpoint. Results: We took advantage of the clonal pattern of X-chromosome inactivation in H9 cells and analyzed the data in an allelic manner. By comparing the RNA-Seq data with known H9 SNPs, we identified genomic positions which were relaxed from XCI in XIST- cells compared to XIST+ cells. Conclusions: Genic as well as unannotated transcripts are massively relaxed from XCI in H9 cells when XIST expression is lost, however, this reactivation is only partial and a large region around the centromere is protected from relaxation of silencing. Total RNA (rRNA depleted) profiles of XIST+ and XIST- human embryonic stem cells

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Xist RNA is a potent suppressor of hematologic cancer in mice.

Project description:X-chromosome aneuploidies have long been associated with human cancers, but causality has not been established. In mammals, X-chromosome inactivation (XCI) is triggered by Xist RNA to equalize gene expression between the sexes. Here we delete Xist in the blood compartment of mice and demonstrate that mutant females develop a highly aggressive myeloproliferative neoplasm and myelodysplastic syndrome (mixed MPN/MDS) with 100% penetrance. Significant disease components include primary myelofibrosis, leukemia, histiocytic sarcoma, and vasculitis. Xist-deficient hematopoietic stem cells (HSC) show aberrant maturation and age-dependent loss. Reconstitution experiments indicate that MPN/MDS and myelofibrosis are of hematopoietic rather than stromal origin. We propose that Xist loss results in X-reactivation and consequent genome-wide changes that lead to cancer, thereby causally linking the X-chromosome to cancer in mice. Thus, Xist RNA is not only required to maintain XCI but also suppresses cancer in vivo. We carried out expression profiling in hematopoietic cells isolated from Xist-deficient female mice before disease (2 months old) and during myeloprolifeative neoplasm/myelodysplastic syndrome (MPN/MDS) and chronic myelomonocytic leukemia (CMML)-like disease (6 and 12 months old) and compared profiles of purified bone marow HSCs (KLS+CD34-), splenic B-cells (B220+), myeloid cells (CD11b+), and erythroid cells (Ter119+) against those of corresponding cell types from age-matched wild-type female mice. We conditionally targeted Xist locus in the blood compartment of mice by crossing Xist2lox/2lox mice (129Sv/Jae; Csankovszki et al., 1999) with Vav.Cre mice (B6.Cg-Tg (Vav1-cre)A2Kio/J; Jackson Laboratory). We used hematopoietic cells that were isolated from Xist-deficient and wild-type female progeny to analyze changes in gene expression due to loss of Xist.

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