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Gene expression in the islets of 12 wk old Non-Obese Diabetic (NOD) mice and healthy control NOD.B10 mice

ABSTRACT: Gene expression in the islets of NOD and NOD.B10 mice at 12 weeks of age, prior to the onset of destructive insulitis. The pancreata of NOD and NOD.B10 mice (n=6) were frozen and islets were isolated by laser capture microdissection. Cryosections (8 M-NM-

ORGANISM(S): Mus musculus

SUBMITTER: Linda Yip

PROVIDER: E-GEOD-45897 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Gene expression in the isolated islets of 10 day old, 4 wk old, 12 wk old, and 20 wk old Non-Obese Diabetic (NOD) mice compared to healthy age matched control NOD.B10 mice

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Gene expression in the islets of 12 wk old Non-Obese Diabetic (NOD) mice and healthy control NOD.B10 mice

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Project description:41K whole genome oligo-microarrays (Agilent Technologies) were used to characterize age-dependent changes in gene expression in pancreatic lymph nodes (PLN) obtained from up to 7 individual NOD mice at 6 different time points (10 days (n=7), and 4 weeks (n=6), 8 weeks (n=4), 12 weeks (n=7), 16 weeks (n=6), and 20 weeks of age (n=5)), compared to NOD.B10 tissue controls. "Milestone Genes" are genes whose expression was significantly changed (approximately 3 fold) as the result of splicing or changes in transcript level. Milestone Genes were identified among genes within type one diabetes (T1D) susceptibility regions (Idd). Milestone Genes showing uniform patterns of changes in expression at various time points were identified. Potential T1D candidate genes were identified among Milestone Genes within Idd regions and/or hierarchical clusters. These studies identified tissue- and age-specific changes in gene expression that may play an important role in the inductive or destructive events of T1D. NOD/LtJ (NOD), NOD.B10Sn-H2b/J (NOD.B10) female mice of multiple ages were used for this study. Six Groups of NOD mice were sacrificed at 10 days, and 4, 8, 12, 16, and 20 weeks of age and pancreatic lymph nodes (PLN) were removed and prepared for mRNA analysis. Two Groups of 10 NOD.B10 mice [10 days (n=10) + 20 weeks of age (n=10)] were used as a tissue specific control. Gene (mRNA) expression was analyzed using the 41K Whole Mouse Genome Oligo Microarray Kit (Agilent Technologies), and gene expression data are processed (cy3: NOD, cy5: NOD.B10) and reported as normalized expression ratios: Log 10 (NOD processed signal / NOD.B10 processed signal) (Log ratio). 10days of age; PLN_10d (n=7), 4 weeks of age; PLN_4w (n=6), 8 weeks of age; PLN_8w (n=4), 12 weeks of age; PLN_12w (n=7), 16 weeks of age; PLN_16w (n=6), 20 weeks of age; PLN_20w (n=5)

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Gene expression in the pancreas of 12 week old Non-Obese Diabetic (NOD) mice vs. healthy age-matched NOD.B10 control mice

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Project description:Type 1 diabetes (T1D) is an autoimmune disease characterized by pancreatic beta-cell destruction. It is a complex genetic trait driven by over 30 genetic loci with parallels between humans and mice. The NOD mouse spontaneously develops autoimmune diabetes and is widely used to identify insulin-dependent diabetes (Idd) genetic loci linked to diabetes susceptibility. While many Idd loci have been extensively studied, the impact of the Idd2 locus on autoimmune diabetes susceptibility remains to be defined. To address this, we generated a NOD congenic mouse bearing B10 resistance alleles on chromosome 9 in a locus coinciding with part of the Idd2 locus and find that NOD.B10-Idd2 congenic mice are highly resistant to diabetes. Bone marrow chimera and adoptive transfer experiments show that the B10 protective alleles provide resistance in an immune cell-intrinsic manner. While no T cell-intrinsic differences between NOD and NOD.B10-Idd2 mice were observed, we find that the Idd2 resistance alleles limit the formation of spontaneous and induced germinal centers. Comparison of the B cell transcriptome profile from NOD and NOD.B10-Idd2 mice reveal that resistance alleles at the Idd2 locus affect the expression of specific MHC molecules, a result confirmed by flow cytometry. Altogether, these data demonstrate that resistance alleles at the Idd2 locus impair germinal center formation and influence MHC expression, both of which likely contribute to reduce diabetes incidence.

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