Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Expression Analysis of Gastric Cancers

ABSTRACT: Microarray Expression profiles from 58 samples comprising of 3 normals and 55 gastric cancers is used for molecular subclassification of Gastric Cancers. Data Generation and Processing: The ratiometric data here is given by Ch1(Cy3)/Ch2(Cy5) where Ch2 is Universal Reference RNA from Stratagene. Two different chips were used (13K and 18k); The ratio metric is given by (Biological sample / Universal Reference). The Biological Samples are labeled with Cy3 (Green) and the Universal Reference RNA is always labeled with Cy5 (Red). Two types of spots were excluded a) Spots for which Foreground intensity was lower from background by lesser than 10 fluoresence units. b) Spots that couldnt be identified reliably by the scanner (Arrayworx) software within the "region of interest" masked by the user. The 2 channels for each array are equalized by multiplying the reference channel Ch2(Cy5) by a constant which is derived by (Total Cy3 / Total Cy5). Subsequently, all expression ratios from each array is normalized to have median expression value = 1. Keywords: other

ORGANISM(S): Homo sapiens

PROVIDER: GSE2637 | GEO | 2005/07/25

SECONDARY ACCESSION(S): PRJNA92279

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Similar Datasets

Expression Analysis of Gastric Cancers

Project description:Microarray Expression profiles from 58 samples comprising of 3 normals and 55 gastric cancers is used for molecular subclassification of Gastric Cancers. Data Generation and Processing: The ratiometric data here is given by Ch1(Cy3)/Ch2(Cy5) where Ch2 is Universal Reference RNA from Stratagene. Two different chips were used (13K and 18k); The ratio metric is given by (Biological sample / Universal Reference). The Biological Samples are labeled with Cy3 (Green) and the Universal Reference RNA is always labeled with Cy5 (Red). Two types of spots were excluded a) Spots for which Foreground intensity was lower from background by lesser than 10 fluoresence units. b) Spots that couldnt be identified reliably by the scanner (Arrayworx) software within the "region of interest" masked by the user. The 2 channels for each array are equalized by multiplying the reference channel Ch2(Cy5) by a constant which is derived by (Total Cy3 / Total Cy5). Subsequently, all expression ratios from each array is normalized to have median expression value = 1.

2010-06-09 | E-GEOD-2637 | biostudies-arrayexpress

Expression profiling of Gastric Cancers

Project description:124 gastric biopsies comprising of Normals, Intestinal Metaplasia, Chronic Gastritis and Carcinomas are profiled. The ratio metric is given by (Biological sample / Universal Reference). The Biological Samples are labeled with Cy5 (Green) and the Pooled Normal Biopsies RNA is always labeled with Cy3 (Red). The arrays were scanned using a ScanArray 5000 scanner (Perkin-Elmer) and data extraction was done using Quantarray (GSI Lumonics). Subsequently, the data was imported into GeneSpring (Silicon Genetics) and intensity dependent LOWESS normalization was performed. The 7383 genes were filtered using an intensity in the reference channel (Cy3) of 300. This corresponded to 2 standard deviations above the mean for the background signal. Background singal was calculated using the empty wells/spots on the array and the average of 4 different positions on the slide were used. Keywords: other

2005-07-25 | GSE2669 | GEO

Contribution of unique genes by individual cell lines to Universal Mouse Reference RNA

Project description:RNA from 11 individual mouse cell lines were reverse-transcribed to cDNA, labeled with Cy5 and cohybridized with Cy3-labeled UMRR onto 7,500-spot mouse oligo microarrays (UNC). The data was analyzed using GeneTraffic software. 300-1000 spots out of 8,000 were flagged on each microarray and excluded from further analysis. Spots with hybridization signals in Cy5 channel higher than 1000 and with Cy5/Cy3 ratio greater than 2 were collected and the number of spots with these characteristics on only one microarray was determined. A reference experiment design type is where all samples are compared to a common reference. Keywords: reference_design

2006-01-05 | GSE3974 | GEO

Contribution of unique genes by individual cell lines to Universal Human Reference RNA

Project description:Total RNA isolated from 10 individual human cell lines were reverse-transcribed to cDNA, labeled with Cy5 and co-hybridized with Cy3-labeled UHRR onto 43,000-spot cDNA microarrays (Stanford University). The data was analyzed using GeneTraffic software. Approximately 6000-8000 spots out of 43,000 (14-18 %) were flagged on each microarray and excluded from further analysis. Spots with hybridization signals in Cy5 channel higher than 1000 and with Cy5/Cy3 ratio greater than 2 were collected and the number of spots with these characteristics in only one cell line was determined. A reference experiment design type is where all samples are compared to a common reference. Keywords: reference_design

2006-01-05 | GSE3972 | GEO

Microarray Coverage of Universal Human Reference RNA on microarrays with yeast controls

Project description:Microarray coverage of UHRR was determined by counting the number of spots with intensities exceeding the 1% and 5% false positive rates defined using the yeast negative control spots. Seven microarrays from different print runs were used. In four experiments, the UHRR was labeled with Cy5 and in three experiments with Cy3. Labeled UHRR was co-hybridized with Common Reference RNA (CRF) developed at Stanford University (8) labeled with the alternate dye. A reference experiment design type is where all samples are compared to a common reference. Keywords: reference_design

2006-01-05 | GSE3973 | GEO

Expression profiling of Gastric Cancers

2010-06-10 | E-GEOD-2669 | biostudies-arrayexpress

Expression Profiling of Severed Rat Medial Collateral Ligament Following Injury

Project description:Gene Expression Profiling of Severed Rat Medial Collateral Ligament at 1, 2, 4, 7,1 0, and 14 days Following Injury with Control and Cultured Ligament Fibroblasts and Rat Universal Reference RNA The aim of this study was to assess the genes involved in the repair of the the dense connective tissue of the a rat ligament in order to provide targets for improvement in healing. Rat whole genome microarrays (Agilent) were used in this study and Cy3 and Cy5 labeled total RNA was extracted and labeled with Cy3 or Cy5 prior to fragmentation and hybridization. Keywords: Time course of changes in gene expression in the healing of the rat medial collateral ligament.

2008-03-05 | GSE10720 | GEO

mRNA abundance in HEK293T cells mock or miR-124 transfected

Project description:HEK293T cells were either mock or miR-124 transfected. Cells were lysed 12 hours after transfection with Trizol reagent. RNA was isolated, amplified, labeled (cy5), and comparatively hybridized with a universal reference (cy3) on HEEBO arrays in biological triplicate. In addition, each biological replicate was measured twice (#2's). Data from the technical replicates was averaged before analysis. SS=steady state Compound Based Treatment: miR-124

2009-11-10 | GSE18835 | GEO

Genetic instability in colon cancer

Project description:Experimental set accompanying Giacomini et al publication "A legacy gene-expression signature of genetic instability in colon cancer". Includes 18 colon cancer cell line training set, 13 colon cancer cell line test set, and 3 cell lines (HCT116, HCT116+ch2, HCT116+ch3) used to evaluate signature after correcting underlying genetic instability. Experiments were performed by comparing mRNA from each colon cancer cell line (Cy5; channel 2) to a "universal" mRNA reference (Cy3; channel 1). A disease state experiment design type is where the state of some disease such as infection, pathology, syndrome, etc is studied. Series type: disease_state_design Series_overall_design: Using regression correlation Keywords: other

2005-12-06 | GSE2591 | GEO

BAF250B-associated SWI/SNF chromatin-remodeling complex is required to maintain undifferentiated mouse ES cells

Project description:We used BAF250b-/- ES cells, two independently derived clones, at 18 and 72 hr in culture and compared them with parental cell line (wild-type) at the same time in culture (two replications each). Total RNAs were extracted using Trizol (Invitrogen) according to manufacturer protocol. 2.5 ug of total RNA samples were labeled with Cy3-CTP using a Low RNA Input Fluorescent Linear Amplification Kit (Agilent). A reference target (Cy5-CTP-labeled) was prepared from the Universal Mouse Reference RNA (Stratagene). Labeled targets were purified using an RNeasy Mini Kit (Qiagen) according to the Agilent's protocol, quantitated by a NanoDrop scanning spectrophotometer (NanoDrop Technologies), and hybridized to the NIA Mouse 44K Microarray v2.2 (whole genome 60-mer oligo; manufactured by Agilent Technologies, #014117) (Carter et al. 2005) according to the Agilent protocol (G4140-90030; Agilent 60-mer oligo microarray processing protocol - SSC Wash, v1.0). All hybridizations were carried out in the two color protocol by combining one Cy3-CTP-labeled experimental target and Cy5-CTP-labeled reference target. Microarrays were scanned on an Agilent DNA Microarray Scanner, using standard settings, including automatic PMT adjustment. Keywords: genetic modification design,time series design

2008-06-09 | GSE8996 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data