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Gene expression profile of sheep following dietary iodide supplementation

ABSTRACT: In the present study, we studied the effect of dietray iodide (IOD) supplementation on the transcriptome's profile of sheep. The main objective was to evaluate the effect of IOD-supplementation on the overall transcriptome of sheep, the altered pathways, and the biological processes related to it . A previously custom-designed oligo microarray platform (GPL20576) was used to profile the transcriptome of 10 ewes at two time points [T0 (before supplementation) and T40 (after 40-days supplementation period). The Isolated and purified total RNAs were individually hybridized to the custom (4x44k) DNA microarray. The comparison of unsupplemented and supplemented animals' transcriptome revealed a large set of differentially expressed genes. Functional analysis showed several pathways and biological processes that have been altered following IOD-supplementation to the diet.

ORGANISM(S): Ovis aries

PROVIDER: GSE74778 | GEO | 2019/12/26

REPOSITORIES: GEO

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Project description:Transcriptomics and functional bioinformatics were used to investigate the potential interactions of undernutrition and the presence of the conceptus at the time of maternal recognition of pregnancy on uterine indicators of metabolism and reproduction. Adult Rasa Aragonesa ewes were allocated to one of two planes of nutrition during 28 days: maintenance energy intake (control; 5 cyclic, 6 pregnant ewes) providing 7.8 MJ of metabolisable energy per ewe and 0.5 maintenance intake (undernourished; 6 cyclic, 7 pregnant ewes) providing 3.9 MJ of metabolisable energy per ewe. RNA from uterine tissue was harvested at slaughter on day 14 of estrus or pregnancy, and hybridized to the Agilent 15K Sheep Microarray chip. Functional bioinformatics analyses were performed using the Dynamic Impact Approach (DIA) and Ingenuity Pathway Analysis. Among metabolic pathways, citrate cycle, oxidative phosphorylation, pentose and glucuronate interconversions and biosynthesis of unsaturated fatty acids were upregulated in control pregnant compared with control cyclic ewes. However, these pathways were not altered in undernourished ewes. The presence of an embryo in undernourished ewes upregulated fatty acid and glycogenic amino acid metabolism. RIG-I and Toll like receptors and chemokine signaling pathways were upregulated by the presence of the embryo in both control and undernourished ewes, but in the latter group the impact was lower. Undernutrition alone upregulated carbohydrate metabolism, but different pathways were altered in cyclic versus pregnant ewes. Citrate cycle, glycolysis/gluconeogenesis, and pentose and glucuronate interconversions were upregulated in undernourished cyclic compared with control cyclic ewes. Glycolysis/gluconeogenesis, pyruvate and propanoate metabolism, beta-alanine and phenylalanine metabolism were upregulated in undernourished pregnant compared with control pregnant ewes, whereas biosynthesis of unsaturated fatty acids and replication and repair were downregulated. Undernutrition alone led to an overall weak activation of immune system pathways both in cyclic and pregnant ewes. However, undernourished cyclic compared with control cyclic ewes had a high activation of NOD-like and RIG-1 like receptor signaling pathways, whereas undernourished pregnant compared with control pregnant ewes only had a weak upregulation of T cell receptor signaling pathways. Overall, data revealed that metabolic and immune adaptations of the uterus to nutrient restriction are dependent on the presence of the conceptus.

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Gene expression profile of sheep following dietary iodide supplementation

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