Expression profiling of lung tissue from 6-, 10- and 14-week-old Fra2 transgenic male mice
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
SUBMITTER: Marion Horsch
PROVIDER: E-GEOD-23745 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:V-erb-b2 erythroblastic leukemia viral oncogene homolog 2 (ERBB2; synonyms HER2, NEU) encodes a transmembrane glycoprotein with tyrosine kinase-specific activity that acts as a major switch in different signal-transduction processes. ERBB2 amplification and overexpression have been found in a number of human cancers, including breast, ovary and kidney carcinoma. Our aim was to detect ERBB2-regulated target genes regulated in Erbb2 transfected murine fibroblast cells after tetracycline treatment to stop the overexpression of ERBB2. Changes in gene expression patterns in these cells after the switch-off of Erbb2 expression was analysed after 8 different periods of time after the treatement (1h-7d). Identification of co-regulated genes and in cluster analysis were performed. Keywords: Erbb2, cDNA microarrays, murine fibroblasts, gene expression levels of 8 different measurements after tetracycline treatment (1h, 2h, 4h, 12h, 24h, 3d, 5d and 7d) were compared to the non-treated NIH3T3 cell line. As control two different untreated NIH3T3 cell line were ananysed. For all comparisons 4 experiments have been performed including 2 dye swaps.
2009-09-01 | E-GEOD-8373 | biostudies-arrayexpress
Project description:The alpha-fetoprotein (AFP) gene is a member of the albumin gene family and encodes a serum glycoprotein with an onco-fetal pattern of expression. AFP is produced in high concentrations during embryonic life by the hepatocytes and the visceral endoderm of the yolk sac and to a lesser extent by the developing gastrointestinal tract and kidney. Alpha-fetoprotein is the major serum fetal protein in mammals, with a concentration that reaches the order of several mg/ml. Its synthesis decreases dramatically shortly after birth to reach only trace amounts a few weeks later but can be restored during life when liver pathologies or some types of tumors develop (hepatitis, cirrhosis, hepatoma, teratocarcinoma, and some pancreatic and renal tumors). AFP is then mainly expressed by the adult liver. AFP produced by the embryo is secreted in the amniotic fluid and is able to cross the placental barrier to reach the maternal blood circulation, where its titer is used as a diagnostic marker to reveal developmental anomalies of the fetus. Abnormally high levels of AFP in the maternal serum indicates elevated risk for neural tube defects of the fetus such as spina bifida or anencephaly, whereas abnormally low levels indicates elevated risk for a Down’s syndrome. Measurements of the AFP levels in the maternal serum are undertaken at 14-22 weeks of each pregnancy and are part, along with unconjugated estradiol, human chorionic gonadotropin and inhibin A, of the quadruple test for antenatal Down’s syndrome screening. Abnormal AFP levels can also be indicative of other fetal pathologies. The reason why these pathologies induce abnormal levels of AFP is still not known. Homozygous Afp knock-out females (AFP KO) are sterile, due to anovulation. Ovaries contain mature follicles and are functional, but lack a proper signal from the hypothalamic-pituitarian axis (HPG) in order to ovulate. The expression profile of several genes in the HPG is impaired. Furthermore, AFP KO females are masculinized and defeminized. They exhibit a loss of female sexual behaviour (no lordosis) and a male pattern of tyrosine hydroxylase expressing neurons distribution in some sexual dimorphic areas of the brain. The phenotype of those mice is a consequence of an estrogen overexposure of their brains during the perinatal period. This phenotype can be reversed if these mice develop in an embryonic environment strongly reduced in estrogens. Homozygous AFP KO mice that developed in those conditions are fertile in adulthood (no further treatment needed), and exhibit proper sexual behaviour. cDNA microarray analysis of embryonic and adult liver tissue of AFP1 kO mice. Single mutant mice were analysed versus a pool of wt RNA in two technical replicates (only for adult tissue) including a dye swap experiment. In total 6 adult mutant male mice and 6 embryos (3 male and 3 female) were analysed
2011-01-01 | E-GEOD-20561 | biostudies-arrayexpress
Project description:Col1a1 is located on mouse distal chromosome 11 (Celera 94607393-94622990bp; 15kb) and encodes type I procollagen that associates stoichiometrically with col1a2 in forming secreted type I mature collagen that self-assembles into a supramolecular fibrillar structure consisting of a protein family. Type I collagens are predominantly enriched in bone, cartilage, skin, tendons, and eye (i.e. in major fibrous tissues) making up the main extracellular matrix (ECM) component for support and scaffolding purposes. Col1a1 is known to be expressed in the embryo (E9.5; Northern dot blot), perioptic mesenchyme (E11), cornea (E11), skeleton (E14.5), brain meninges (E14.5), and cartilage (E14.5) at relatively early stages. Most evidence of type I collagen function is coupled to the latter stages of skeletal development, thus bypassing the major events of axis formation, tissue differentiation, and mesenchlymal-epithial interactions, for example, that are more symbolic of morphogens and growth factors. Members of the integrin cell surface receptor family of molecules mediate cell adhesion to ECM proteins such as collagen (mainly to type IV basement membrane collagen that forms into a polygonal meshwork), fibronectin, and laminin implicated in wound healing and inflammatory responses (e.g. Crohn disease, ulcerative colitis) in connective tissues. There is some evidence for protein-protein interactions between leukocyte-associated integrins and the interstitial matrix in promoting the migration and/or activation of extravasated leukocytes (e.g., T cells and monocytes) within the perivascular compartment, an ECM-rich environment. This region is surmised to be an important location where certain human leukocytes undergo differentiation (e.g. monocytes) and activation (neutrophils, monocytes, lymphocytes) upon extravascular migration. The von Willebrand factor (vWF), type C motif is found in various plasma proteins like complement factors, the integrins, collagen types, and other extracellular proteins. Thus, the majority of vWF-containing proteins are extracellular and a common feature appears to be involvement in multi protein complexes participating in numerous biological events (e.g. cell adhesion, migration, homing, pattern formation, and signal transduction). Three organs (lung, heart and bone) of 5 AGA002 mutant mice (age 2x 10 days and 3x 11 days) were analysed by cDNA microarray technology. As reference five mice, 11 days old were used 50% of the chip hybridisations are dye swap experiments.
2010-06-01 | E-GEOD-12847 | biostudies-arrayexpress
Project description:ADARs, short for adenosine deaminases acting on RNA, were first found by their characteristic activity of deaminating up to 50% of all adenosines in double-stranded RNA in vitro. C. elegans has two ADARs, only one is found in the fly, and mammals express three ADARs. Importantly, the spectrum of physiological roles of these enzymes in the different organisms remains largely unknown. ADARs are ~750-1150 amino acids in size, feature 2-3 N-terminal double-stranded RNA binding motifs, an enzymatic domain related to that of prokaryotic cytidine deaminases, and a ~190 residue extended C-terminal domain of unknown function. The mammalian ADARs are detectable in many if not all tissues, with relatively prominent expression in the central nervous system, predicting tissue- or cell type-specific tasks for the mammalian ADARs. Studies over the last decade collectively indicated that one function of ADARs is the editing of nuclear transcripts to introduce select amino acid substitutions in proteins. Arguably the best-studied example for this type of RNA editing (‘A-to-I editing’) in the mammal is performed by ADAR2 and occurs in primary transcripts for the GluA2 subunit (also known as GluR-B or GluR2 subunit) of AMPA receptors mediating fast excitatory neurotransmission. A particular glutamine codon (CAG) in the exonic sequence for the inner lining of the glutamate-activated AMPA receptor is converted by deamination of the central adenosine into an unusual arginine codon (CIG; the resultant inosine is seen as guanosine by the protein translation machinery). This substitution of the gene-encoded glutamine codon by the edited arginine codon is found in nearly 100% of all GluA2 cDNA derived from brain mRNA. RNA editing in this instance ensures that GluA2-containing AMPA receptors become impermeable to Ca2+. In addition to switching a key functional determinant in GluA2 to nearly 100%, ADAR2 has been implicated in generating numerous amino acid substitutions at lower levels in various mammalian neurotransmitter receptors and voltage-gated ion channels, primarily but not exclusively of nervous tissue. Most of these substitutions elicit distinct functional consequences, which led to the notion that site-selective RNA editing by ADAR2 may ensure the functional fine-tuning of the affected transmembrane proteins. Such fine-tuning should reflect the expansion of the protein sequence directed by the respective gene into sequence subpopulations, each differing in particular functional aspects, such as transmitter efficacy, desensitization, or voltage threshold. If this notion is correct, ADAR2 knockout should elicit phenotypes, which might range from subtle to severe, depending on the physiological role(s) of the ADAR2 targets in different tissues. ADAR2 knockout mice, however, die soon after birth from severe epileptic seizures, a consequence of the changed ion conductance properties of AMPA receptors containing unedited GluA2. Fortunately, mice lacking ADAR2 are robust and have normal life span if they carry GluA2 alleles genetically altered to contain the particular arginine codon for a Ca2+ impermeable ion channel pore of AMPA receptors, thus rescinding the need for ADAR2-mediated GluA2 transcript editing. These mice are thus eminently suitable to study the phenotypic consequences of failure to edit all ADAR2 targets excepting GluA2. We therefore tested cohorts of ADAR2-/-/GluA2(R)/(R) mice in 16 well-established paradigms for central and peripheral phenotypic abnormalities. We report that we found few differences to control mice (GluA2(R)/(R)) and hence, the lack of ADAR2 appears not to affect most of the physiological functions tested. Brain of four mutant animals of ADAR-/-/GluR-BR/R versus a pool of four reference (wildtype) mice; two technical replicates for each mutant mouse including a dye swap experiment - in total 8 chip hybridisations
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2011-01-01 | E-GEOD-20400 | biostudies-arrayexpress
Project description:Production of viable and fertile mice have been reported by nuclear replacement, however, the reasons behind the frequent deformations among foetuses and progeny are not well understood. Activation and in vitro culture methods are also important. Origin of the nuclear donor cells affects success rates, and their survival in culture varies. It has been reported that offspring of nuclear replacement parental mice were normal and fertile. All epigenetic problems in the parents seem to be erased when cell nuclei go through the germ line. cDNA microarray analysis compared expression patterns of Dll1 ko versus Dll1 ko NT (NT = nuclear transfer) and wt versus wt NT of liver and spleen. The aim of this study was analysis of possible epigenetic effects by cloning in the offspring of the 3rd generation. If the 3rd generation cloned animals are indeed phenotypically equivalent to conventional transgenic mouse models then this would open the possibility to develop novel techniques of genetic engineering based on somatic gene targeting and nuclear replacement. four male animals of each cohort (Dll1 conventional transgenic mouse, Dll1 nuclear transfer mouse, wildtype, wildtye nuclear transfer mouse). Two technical replicates including a colour flip experiment. For each analysed organ (liver, spleen) eight experiments including four biological replicates. As reference RNA pools were used
2011-01-01 | E-GEOD-20560 | biostudies-arrayexpress
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2011-01-01 | E-GEOD-19871 | biostudies-arrayexpress
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2011-07-31 | E-GEOD-26699 | biostudies-arrayexpress
Project description:Huntington’s disease (HD) is a dominantly inherited neurodegenerative disorder characterized by abnormal voluntary and involuntary movements, cognitive impairment and psychiatric disturbances. In order to identify phenotypic changes in the mouse that are most likely to be relevant to events triggered by the CAG repeat expansion in HD patients, we are interested in the earliest events that are triggered by expression of a single allele’s worth of full-length mutant huntingtin in the mouse, whether at the molecular, cellular or whole animal level. To this end, we have undertaken a broad-based, unbiased phenotypic screen in heterozygous HdhQ111/+ C57BL/6J mice. For expression profiling analysis, four male mice at the age of 18 weeks were analysed versus a pool of four male wildtype mice (reference) at the same age. For each single mouse, two chip hybridizations, including a dye-swap experiment, were performed per tissue. Using our genome-wide microarray platform, we performed transcriptome analysis of liver and brain.
2011-09-30 | E-GEOD-28232 | biostudies-arrayexpress
Project description:The MFP2-/- (multifunctional protein 2) is a multifunctional enzyme with discovery in connection with different metabolic pathways. It is involved in beta-oxidation of branched fatty acids and long chain fatty acids in peroxisomes and in sythesis of bile fatty acids. MFP2 knock out mouse was made with a phenotype only visible in homozygotes (severe growth retardation, 40% mortality during the first week after birht, reduction of fertility in males, less activity). The studies have been performed to identify changes in gene expression levels in kidney due to clinical chemical changes in the phenotype of this mutant mouse line during a screening in the German Mouse Clinic. Keywords: dual colour hybridisation on cDNA microarrays, MFP2, Hsd17b4, kidney DNA chip technology has been exploited for RNA expression profiling analyses. Close to genomewide microarrays were used for identification of changes in gene expression levels in kidney of 4 MFP2-/- mice. Individual mutant mice were hybridised in repetitions against a pool of 5 reference animals. In total 16 chip hybridisations were performed including 50% dye swap experiments.
2008-06-01 | E-GEOD-6295 | biostudies-arrayexpress