Mammary tissue gene expression studies
Ontology highlight
ABSTRACT:
ORGANISM(S): Bos taurus
PROVIDER: GSE279 | GEO | 2003/02/07
SECONDARY ACCESSION(S): PRJNA84713
REPOSITORIES: GEO
Similar Datasets
Project description:Background: The mammary gland is a dynamic organ that undergoes important physiological changes during reproductive cycles. Until now, data regarding the characterisation of miRNA in the mammary gland have been scarce and mainly focused on their abnormal expression in breast cancer. Our goal was to characterise the microRNA (miRNA) involved in mechanisms regulating the mammary function, with particular focus on the lactation stage Methodology/principal findings: Using high-throughput sequencing technology, an exhaustive repertoire of miRNA (miRNome) expressed in mouse and bovine mammary glands during established lactation was identified, characterised and compared. Furthermore, in order to obtain more information on miRNA loading in the RNA-induced silencing complex (RISC), the miRNome was compared with that obtained from RNA associated with the AGO2 protein (AGO2-miRNome) in mouse lactating mammary gland. This study enabled the identification of 164 and 167 miRNA in mouse and bovine, respectively. Among the 30 miRNA most highly expressed in each species, 24 were common to both species and six of them tended to be more highly expressed in lactating than in non-lactating mammary gland. The potential functional roles of these 24 miRNA were deduced using DIANA-miRPath software, based on miRNA/mRNA interactions. Moreover, seven putative novel miRNA were identified. Using DAVID analysis, it was concluded that the predicted targets of two of these putative novel miRNA are involved in mammary gland morphogenesis. Conclusion/significance: Our study provides an overview of the characteristics of lactating mouse and bovine mammary gland miRNA expression profiles. Moreover, species-conserved miRNA involved in this fundamental biological function were identified. These miRNomes will new be used as references for further studies during which the impact of animal breeding on the miRNA expression will be analysed. microRNA profiles of mammary glands from 2 FVB/N mice at lactation day-12 and mammary biopsies from 4 Holstein dairy cows at mid-lactation, generated by deep sequencing, using Illumina HiSeq 2000.
2014-03-24 | E-GEOD-53511 | biostudies-arrayexpress
Project description:The bovine mammary epithelial cell line Mac-T has been used to study mammary gland in vitro. The reliability of this system to study mammary gland has not been tested using genomics approaches. In the present experimetn a direct transcriptomics comparison between Mac-T cells and mammary tissue at -30 and at 60 day in milk (DIM) is performed. Data indicated that Mac-T cells and mammary tissue had a substantially different transcriptome with a larger difference between Mac-T cells and lactating mammary tissue (i.e., 60 DIM) compared to non-lactating mammary tissue (i.e., -30 DIM). In addition, data indicated that the Mac-T cells substantially differ with mammary tissue in lactation-specific functions. cDNA from Mac-T cells induced in vitro into lactation for 36h (addition of prolactin) was directly hybridize in the microarray chip with cDNA from mammary tissue at -30 or 60 day in milk from 3 cows.
2013-04-30 | E-GEOD-46476 | biostudies-arrayexpress
Project description:Background: The mammary gland is a dynamic organ that undergoes important physiological changes during reproductive cycles. Until now, data regarding the characterisation of miRNA in the mammary gland have been scarce and mainly focused on their abnormal expression in breast cancer. Our goal was to characterise the microRNA (miRNA) involved in mechanisms regulating the mammary function, with particular focus on the lactation stage Methodology/principal findings: Using high-throughput sequencing technology, an exhaustive repertoire of miRNA (miRNome) expressed in mouse and bovine mammary glands during established lactation was identified, characterised and compared. Furthermore, in order to obtain more information on miRNA loading in the RNA-induced silencing complex (RISC), the miRNome was compared with that obtained from RNA associated with the AGO2 protein (AGO2-miRNome) in mouse lactating mammary gland. This study enabled the identification of 164 and 167 miRNA in mouse and bovine, respectively. Among the 30 miRNA most highly expressed in each species, 24 were common to both species and six of them tended to be more highly expressed in lactating than in non-lactating mammary gland. The potential functional roles of these 24 miRNA were deduced using DIANA-miRPath software, based on miRNA/mRNA interactions. Moreover, seven putative novel miRNA were identified. Using DAVID analysis, it was concluded that the predicted targets of two of these putative novel miRNA are involved in mammary gland morphogenesis. Conclusion/significance: Our study provides an overview of the characteristics of lactating mouse and bovine mammary gland miRNA expression profiles. Moreover, species-conserved miRNA involved in this fundamental biological function were identified. These miRNomes will new be used as references for further studies during which the impact of animal breeding on the miRNA expression will be analysed.
2014-03-24 | GSE53511 | GEO
Project description:The bovine mammary epithelial cell line Mac-T has been used to study mammary gland in vitro. The reliability of this system to study mammary gland has not been tested using genomics approaches. In the present experimetn a direct transcriptomics comparison between Mac-T cells and mammary tissue at -30 and at 60 day in milk (DIM) is performed. Data indicated that Mac-T cells and mammary tissue had a substantially different transcriptome with a larger difference between Mac-T cells and lactating mammary tissue (i.e., 60 DIM) compared to non-lactating mammary tissue (i.e., -30 DIM). In addition, data indicated that the Mac-T cells substantially differ with mammary tissue in lactation-specific functions.
2013-04-30 | GSE46476 | GEO
Project description:The goal of this study is to improve the quality, efficiency, and sustainability of milk production by improving the understanding of the function of cis-regulatory elements in regulating the bovine mammary gland. To this end, we have characterized the non-lactating and lactating mammary gland transcriptomes by whole transcriptome shotgun sequencing (RNA-seq). We will identify cis-regulatory elements in the non-lactating and lactating bovine mammary gland genome-wide. Finally, we will annotate and characterize mammary gland cis-regulatory elements by computational analysis and identify high-resolution genome-wide in vivo footprints of diverse trans-acting-factors (TF), over-represented TF bindings sites and overlapping SNPs.
2021-04-06 | GSE116079 | GEO
Project description:miRNAs have been implicated in the regulation of milk protein synthesis and development of mammary gland. However, the function of miRNAs in regulating lactation is unclear. Therefore, the elucidation of miRNA expression profiles in MG provides a crucial entry into the understanding of the mechanisms of lactation initiation. Our present work is to examine miRNA expression profiles in bovine mammary gland, and to evaluate miRNAs function through the identification of differentially expressed miRNA between lactation and non-lactation mammary gland. Identification of novel miRNAs highlights the important function of low abundance and less conserved miRNAs. An interaction network of known miRNAs and their target genes around the lactation function was constructed to postulate the functional roles of miRNAs in mammary gland. This integrated analysis provides important information that will inspire further experimental investigations into the field of miRNAs and their targets during lactation. Examination of 2 different miRNA expression profilings in bovine mammary gland
2012-11-26 | E-GEOD-39000 | biostudies-arrayexpress
Project description:Changes in mammary cell behavior mediating normal breast development during pregnancy and lactation are poorly understood due to limited availability of breast biopsies during this time. Human milk contains a hierarchy of cells including stem cells, mature milk producing cells (lactocytes) and myoepithelial cells. Here we non-invasively sampled the total epithelial cell population of the lactating mammary gland from mature HM collected from healthy mother/infant dyads during the first year postpartum, and explored temporal changes in the mammary cell transcriptome using RNA sequencing. Comparisons were done with mammary secretions from late pregnancy from the same women and with purchased resting mammary tissue. Distinct gene signatures were found for the different mammary developmental stages examined. Cell adhesion pathways were differentially regulated between the resting gland and pregnancy, whereas immune cell signaling and morphogenesis/cancer pathways differed between lactation and pregnancy or the resting gland, respectively. The transcriptome of lactation remained consistent in the first year postpartum in these successfully lactating women. The gene signatures characteristic of HM cells confirmed lactation genes previously reported in animal models and the HM fat globule. This study identifies key genes and molecular pathways undergoing controlled regulation as the mammary gland transitions from a quiescent into a functional organ, providing experimental targets for the molecular investigation of mammary gland pathologies.
2018-12-26 | GSE85494 | GEO
Project description:The mammary gland of the lactating mouse synthesizes and secretes milk lipid equivalent to its entire body weight in a single 20 day lactation cycle, making it one of the most active lipid synthetic organs known. To test the hypothesis that multiple metabolic control points and potential regulatory mechanisms are involved in activating lipid and lactose synthesis at the onset of lactation we compared the mammary transcriptome of 130 genes involved in glucose metabolism between late pregnancy and early lactation and in response to dietary fat. We utilized data obtained from microarray analysis of mammary glands from quadruplicate FVB mice at pregnancy day 17, and lactation day 2. Diets containing 8% or 40% lipid were fed from lactation days 5 to 10 and mammary glands and livers of triplicate FVB mice prepared for microarray analysis. We also compared the metabolome obtained from magnetic resonance spectroscopy of flash frozen glands of the mammary gland at day 17 of pregnancy with that at day 2 of lactation. The results provide a global picture of the multiple metabolic strategies utilized to turn a quiescent organ into an incredibly efficient machine for massive but balanced lipid and lactose synthesis and implicate the transcription factor SREBP-1c in regulation of part of the pathway. Keywords: Timecourse and dose response to dietary fat
2006-02-10 | GSE4222 | GEO
Project description:Transcript profiling was performed by Affymetrix microarray analysis and SAGE to characterize changes in gene expression in the bovine mammary gland in response to 4× versus 2× daily milking during the first week of lactation. These changes in gene expression may contribute to the increased milk production observed in response to increased milking frequency. Our results indicate that increased milking frequency alters expression of genes in the mammary gland related to increased extracellular matrix remodeling, neovascularization, metabolism, cell proliferation and apoptosis. Keywords: Physiological response to stimulus
2007-12-23 | GSE9344 | GEO
Project description:Cross-species hybridization analysis of mammary glands during pregnancy and lactation. Results provide insight into putative conserved molecular mechanisms regulating mammary gland development. This study was performed to identify orthologous transcripts that are differentially co-expressed in the mammary gland at 2 stages of development (pregnancy and lactation) in wild type Sprague-Dawley rats. Key points are examined in a time series of Sprague Dawley rat mammary gland development, secretory activation and lactation. Triplicate rat (three biological replicates) at each time point were used for statistical power totalling 12 individual arrays in this study. Rats were as staged pregnant day 1 the day that post coital plug was observed, and similarly, lactation day 1 was the first day after birth. Whole mammary glands No. 4 (inguinal) were obtained from female rats at stages of development: virgin (adulthood, 14 wks of age), Pregnant (5 and 14 days of pregnancy) and Lactating (day 1 and 12 postpartum). The two-color (Cy5/Cy3) microarray experiment was designed to hybridize samples from each group against a common reference, a pool of RNA from mammary gland of three parous or virgin female rats.
2013-10-30 | E-GEOD-22545 | biostudies-arrayexpress