Gene expression in Snd1 KO mouse spleen
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ABSTRACT:
PROVIDER: PRJNA603070 | ENA |
REPOSITORIES: ENA
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Project description:Staphylococcal nuclease Tudor domain containing 1 (SND1) protein is an oncogene that “reads” methylarginine marks through its Tudor domain. Specifically, it recognizes methylation marks deposited by protein arginine methyltransferase 5 (PRMT5), which is also known to promote tumorigenesis. SND1 is a known driver of hepatocellular carcinoma, but it is unknown if the Tudor domain is needed to drive this disease. We sought to identify the biological role of the SND1 Tudor domain in normal and tumorigenic settings. To do so, we developed two genetically engineered SND1 mouse models, namely a knockout (Snd1 KO) and a Snd1 Tudor domain mutated (Snd1 KI) mouse. Transcriptome analysis of normal KO and KI liver samples reveals a role for the SND1 Tudor domain in regulating expression of major acute phase proteins (APPs) and genes involved in the unfolded protein response (UPR), which could provide mechanistic insight into SND1’s functions in a tumor setting. These processes may provide insight into how SND1 functions as an oncogene. These results support the use of PRMT5 inhibitors, and the development of small molecule inhibitors that target the SND1 Tudor domain, as novel treatments for HCC.
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Project description:PyMT tumor cells with indicated status of Mtdh and Snd1 were treated with camptothecin (CPT) and the transcirptome profiles were determined and compared two sets of experiments: (1) vector control vs Snd1-KD under CPT treament (2) PyMT/Mtdh-KO cells reconstituted with either WT or Snd1-binding deficient mutant Mtdh (W391D) under CPT treatment
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Project description:Conditional IRF8 KO mice (mice with a conditional allele of Irf8 crossed with CD19-Cre mice) showed increased numbers of both Gene expression data spleen marginal zone (MZ) and Gene expression data spleen follicular (FO) B cells compared to control mice. To evaluate gene expression patterns that distinguished FO or MZ B cells derived from conditional KO and control mice, we used Affymetrix GeneChip® Mouse gene 1.0 ST Array.
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Project description:Conditional IRF8 KO mice (mice with a conditional allele of Irf8 crossed with CD19-Cre mice) showed increased numbers of both Gene expression data spleen marginal zone (MZ) and Gene expression data spleen follicular (FO) B cells compared to control mice. To evaluate gene expression patterns that distinguished FO or MZ B cells derived from conditional KO and control mice, we used Affymetrix GeneChip® Mouse gene 1.0 ST Array. FACS-sorted MZ and FO B cells from individual mouse were used for RNA extraction and Affyarray hybridization. There were six independent biological replications in each group - six cases of MZ B cells and FO cells in IRF8 conditional KO mice and six cases of MZ B cells and FO cells in control WT mice.
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Project description:The pancreatic β cell synthesizes, packages, and secretes insulin in response to glucose-stimulation to maintain blood glucose homeostasis. Under diabetic conditions, a subset of β cells fail and lose expression of key transcription factors (TFs) required for insulin secretion. Among these TFs is Pancreatic and duodenal homeobox 1 (Pdx1), which recruits a unique subset of transcriptional coregulators to modulate its activity. Here we describe a novel interacting partner of Pdx1, the Staphylococcal Nuclease and Tudor domain-containing protein (Snd1), which has been shown to facilitate protein-protein interactions and transcriptional control through diverse mechanisms in a variety of tissues. Pdx1:Snd1 interactions were confirmed in rodent β cell lines, mouse islets and human islets. Utilizing CRISPR-Cas9 gene editing technology, we deleted Snd1 from the mouse β cell lines, which revealed numerous differentially expressed genes linked to insulin secretion and cell proliferation, including limited expression of Glp1r. We observed Snd1 deficient β cell lines had reduced cell expansion rates, Glp1r protein levels and limited cAMP accumulation under stimulatory conditions, and further show that acute ablation of Snd1 impaired insulin secretion in rodent and human β cell lines. Lastly, we discovered that PDX1:SND1 interactions were profoundly reduced in human β cells from donors with type 2 diabetes (T2D). These observations suggest the Pdx1:Snd1 complex formation is critical for controlling a subset of genes important for β cell function and is targeted in diabetes pathogenesis
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