A Tool for Sheep Product Quality: Custom Microarray from Public Databases
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ABSTRACT:
ORGANISM(S): Ovis aries
PROVIDER: GSE18619 | GEO | 2009/11/30
SECONDARY ACCESSION(S): PRJNA121453
REPOSITORIES: GEO
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Project description:Milk and dairy products are an essential food and an economic resource in many countries. Milk component synthesis and secretion by the mammary gland involve expression of a large number of genes whose nutritional regulation remains poorly defined. We aim at understanding the genomic influence on milk quality and synthesis by comparing two sheep breeds, with different milking attitude, Sarda and Gentile di Puglia, using sheep-specific microarray technology. From sheep ESTs deposited at NCBI, we generated the first annotated microarray developed for sheep with a covering of most of the genome. Whole tissue samples of mammary gland were collected from 4 lactating individuals of two sheep (Ovis aries) breeds, Gentile di Puglia and Sarda. Biopsies of lactating mammary tissue were taken at two lactation stages (first record, stage 01: 6 days after lambing; second record, stage 02: 44 days after lambing) in both breeds. Tissues from mammary gland were immersed in RNAlater (Sigma) immediately after biopsy and stored at -20°C.
2010-05-19 | E-GEOD-18619 | biostudies-arrayexpress
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Project description:To investigate the molecular bases of diet induced differences in milk composition, we collected milk from mid lactation dairy ewes and after 3 weeks of diet supplementation with extruded linseed. RNAs were isolated from milk somatic cells isolated from milk of 3 sheep and Illumina RNA sequencing was performed to analyze RNA synthesis in these cells.
2017-02-08 | GSE89163 | GEO
Project description:Milk can mediate maternal-neonatal signal transmission by the bioactive component-extracellular vesicles (EVs), which select specific types of miRNA to encapsulate. The miRNA profiling of sheep milk EVs was characterized by sequencing and compared with that of cow milk. Sheep milk EVs contained various small RNAs, including tRNA, Cis-regulatory element, rRNA, snRNA, other Rfam RNA, and miRNA, which held about 36% of all the small RNAs. Totally 84 types of miRNAs were annotated with Ovis aries by miRBase (version 22.0) in sheep milk EVs, with 75 shared types of miRNAs in all samples. Fourteen sheep milk EV-miRNAs in the top 20, occupying 98% of the total expression, were immune-related.
2020-01-17 | GSE143779 | GEO
Project description:This study presents a dynamic characterization of the sheep milk transcriptome aiming at achieving a better understanding of the sheep lactating mammary gland. Transcriptome sequencing (RNA-seq) was performed on total RNA extracted from milk somatic cells from ewes on days 10, 50, 120 and 150 after lambing. The experiment was performed in Spanish Churra and Assaf breeds, which differ in their milk production traits. Nearly 67% of the annotated genes in the reference genome (Oar_v3.1) were expressed in ovine milk somatic cells. For the two breeds and across the four lactation stages studied, the most highly expressed genes encoded caseins and whey proteins. We detected differentially expressed genes (DEGs) across lactation points, with the largest differences being found, between day 10 and day 150. Upregulated GO terms at late lactation stages were linked mainly to developmental processes linked to extracellular matrix remodeling. A total of 256 annotated DEGs were detected in the Assaf and Churra comparison. Some genes selectively upregulated in the Churra breed grouped under the endopeptidase and channel activity GO terms. These genes could be related to the higher cheese yield of this breed. Overall, this study provides the first integrated overview on sheep milk gene expression.
2016-06-07 | GSE74825 | GEO
Project description:Regulation of milk synthesis and secretion is controlled mostly through local (intra-mammary) mechanisms. To gain insight into the molecular pathways comprising this response, an analysis of mammary gene expression was conducted in 12 lactating cows shifted from twice daily to once daily milking. Tissues were sampled by biopsy from adjacent mammary quarters of these animals during the two milking frequencies, allowing changes in gene expression to be assessed within each animal. Using bovine-specific, oligonucleotide arrays representing 21,495 unique transcripts, a range of differentially expressed genes were found as a result of less frequent milk removal.
2009-07-01 | GSE16876 | GEO
Project description:The knowledge of the genetic architecture behind feed efficiency would allow to breed more efficient animals maximizing farm profitability and reducing the environmental impact of animal production. This study analyzes high throughput gene expression data from milk samples to determine key genes and biological mechanisms associated to feed efficiency in dairy sheep.A detailed description of the sheep management practices and calculations for the feed efficiency index (FEI) are detailed in 10.3168/jds.2020-19061. For these analyses, we selected animals with divergent FEI values from a group of 40 lactating Assaf ewes. RNA-Seq was performed on milk somatic cell samples from 8 high feed efficiency sheep (H-FE), FEI = −0.29 (SD = 0.23), RFI = −0.16 (SD = 0.25), and 8 low feed efficiency sheep (L-FE), FEI = 0.81 (SD = 0.24), RFI = 0.19 (SD = 0.24)).
2023-02-14 | E-MTAB-12355 | biostudies-arrayexpress
Project description:Once daily milking reduces milk yield and alters mammary transcriptome resulting in a decrease in milk protein synthesis as well as an induction of the apoptotic signaling networks. A local regulation due to milk stasis in the tissue could contribute to this effect but such mechanisms have not yet been described. To challenge this hypothesis, cows were milked unilaterally, once daily on one udder half and twice daily on the other one, and variations in gene expression were studied in biopsies as well as in mammary epithelial cells (MEC) shed into milk during the lactation process (milk MEC). This study therefore also contributes to decipher if transcript variations in milk purified MEC can reflect that of the mammary tissue. We compared the mammary transcript profiles in biopsies collected from unilaterally once versus twice-daily milked udder halves, 504 transcripts were differentially expressed: 193 and 232 transcripts were up- and down-regulated, respectively. A first category of transcripts, which accumulation levels are mostly up-regulated, relates to mechanisms involved in cell renewal, such as cell cycle, cellular growth and proliferation, cell death and cellular development. A second family, mostly down-regulated, is involved in small molecule biochemistry, amino acid, lipid and carbohydrate metabolisms as well as molecular transport. A third category, mostly up-regulated, includes transcripts expressed in non-epithelial mammary cells such as adipocytes, endothelial and immune cells and cells from the connective tissue. These results are consistent with previous data showing a decrease in mammary synthesis activity and an activation of cell death during once daily milking. They further suggest that during once daily milking the local milk accumulation has a major effect on mammary remodeling. Interestingly, some transcripts belonged to a third family described as « molecular transports ». The expression of the 21 mRNA was then analyzed by RT-par in MEC (Table 4). Seven transcripts (NUCB2, RNASE4, ABCG2, RNASE1, SLC34A2, Cap1, FABP3, LALBA, SCD) were significantly down-regulated in milk purified MEC. Six were also significantly down-regulated in mammary biopsies. These transcripts are mostly involved in milk synthesis. We therefore conclude that milk purified MEC cannot be used as general markers of variations occurring in the mammary tissue but that variations in some transcripts listed above can be useful indicators.
2013-08-27 | GSE43505 | GEO
Project description:BACKGROUND: The lactating mammary gland responds to changes in milking frequency by modulating milk production. This response is locally regulated and, in dairy cows, the udder is particularly sensitive during early lactation. Relative to cows milked twice-daily throughout lactation, those milked four-times-daily for just the first 3 weeks of lactation produce more milk throughout that lactation. We hypothesized that the milk yield response would be associated with increased mammary cell turnover and changes in gene expression during frequent milking and persisting thereafter. Cows were assigned to unilateral frequent milking (UFM; left udder halves milked twice-daily; right udder halves milked four-times daily) on days 1 to 21 of lactation, followed by twice-daily milking for the remainder of lactation. Relative to udder halves milked twice-daily, those milked four-times produced more milk during UFM; the difference in milk yield declined acutely upon cessation of UFM after day 21, but remained significantly elevated thereafter. We obtained mammary biopsies from both udder halves on days 21, 23, and 40 of lactation. RESULTS: Mammary cell proliferation and apoptosis were not affected by milking frequency. We identified 75 genes that were differentially expressed between paired udder halves on day 21 but exhibited a reversal of differential expression on day 23. Among those genes, we identified four clusters characterized by similar temporal patterns of differential expression. Two clusters (11 genes) were positively correlated with changes in milk yield and were differentially expressed on day 21 of lactation only, indicating involvement in the initial milk yield response. Two other clusters (64 genes) were negatively correlated with changes in milk yield. Twenty-nine of the 75 genes were also differentially expressed on day 40 of lactation. CONCLUSIONS: Changes in milking frequency during early lactation did not alter mammary cell population dynamics, but were associated with coordinated changes in mammary expression of at least 75 genes. Twenty-nine of those genes were differentially expressed 19 days after cessation of treatment, implicating them in the persistent milk yield response. We conclude that we have identified a novel transcriptional signature that may mediate the adaptive response to changes in milking frequency.
2014-01-01 | GSE27851 | GEO