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Sample GSM398261 Query DataSets for GSM398261
Status Public on May 13, 2009
Title HS41-1_0d_rep1
Sample type RNA
 
Source name Flag leaves, harvested at 0 d after drought stress
Organism Hordeum vulgare
Characteristics genotype: HS41-1
trait for drought tolerance: drought tolerance
tissue: flag leaves
treatment: 0 d after drought stress
Extracted molecule total RNA
Extraction protocol Seven flag leaves of a replication for each genotype were harvested at 0 d after reach 10% of AWC in the soil to constitute a single biological replicate. These flag leaves were employed for RNA isolation by using Trizol reagent following the manufacturer’s protocol (Invitrogen, Karlsruhe, Germany). The RNA was further purified using RNeasy Kit (Qiagen, Hilden, Germany). RNA yield and quality were determined by using an Agilent 2100 Bioanalyzer (Agilent Techologies, Boblingen, Germany).
Label Biotin
Label protocol 5 µg of high quality total RNA were reverse transcribed using the One-Cycle cDNA Synthesis Kit (Affymetrix, Santa Clara, CA, USA). The resulting double-stranded cDNA was used as a template to generate biotin-tagged cRNA from an in vitro transcription reaction (IVT), using Affymetrix IVT Labeling Kit as Expression Analysis Technical Manual (2001, Affymetrix)
 
Hybridization protocol Biotin-tagged cRNA was fragmented to strands of 35 to 200 bases in length, and 15 µg of fragmented cRNA was used for each hybridization. Barley 1 GeneChips were hybridized for 16 h at 45°C with rotation in a GeneChip® Hybridization Oven 640 (Affymetrix, Santa Clara, CA, USA). The arrays were washed and stained with R-phycoerythrin streptavidin in a Fluidics Station.
Scan protocol The Arrays were subsequently scanned with Affymetrix GeneChip® Scanner 3000
Description All scanned data from barley 1 GeneChips were processed by robust multiarray average (RMA) (Irizarry et al., 2003) using ArrayAssist software version 3.4 (Stratagene, La Jolla, CA, UAS)
Data processing Normalized expression values were computed from raw CEL files by first applying the RMA model of probe-specific correction of perfect match probes. The algorithm consists of three steps—a model-based background correction stage neutralizes the effects of background noise and the processing artifacts, a subsequent quantile normalization stage aligns expression values to a common scale, and finally, an iterative median polishing procedure summarizes the data and generates a single expression value for each probe set. Resulting RMA expression values were log2-transformed. Average log signal intensity values of three biological replicates for each sample were then computed and these were used for further analysis. To identify differentially expressed genes, student's t-test was applied with a maximal FDR (false discovery rate) of 5% (Benjamini-Hochberg algorithm).
RMA data for each individual Affymetrix chip not available. Thus the Sample data tables instead report MAS5.0-processed data. A table of the average, log2 RMA signal intensity values of three biological replicates for each sample is linked as a supplementary file on the GSE15970 record.
 
Submission date Apr 28, 2009
Last update date May 15, 2009
Contact name Michael Baum
E-mail(s) m.baum@cgiar.org
Phone +963 (21) 2213433
Fax +963 (21) 2213490
URL http://www.icarda.cgiar.org
Organization name ICARDA
Department BIGMP
Street address ICARDA
City Aleppo
State/province Aleppo
ZIP/Postal code 5466
Country Syria
 
Platform ID GPL1340
Series (1)
GSE15970 Differentially Expressed Genes between Drought-tolerant and Drought-sensitive Barley Genotypes

Data table header descriptions
ID_REF
VALUE Signal
ABS_CALL indicating whether the transcript was present (P), absent (A), or marginal (M)
DETECTION P-VALUE

Data table
ID_REF VALUE ABS_CALL DETECTION P-VALUE
AFFX-BioB-5_at 65.0415 P 0.00255552
AFFX-BioB-M_at 79.4812 P 0.000340305
AFFX-BioB-3_at 50.1382 P 0.00110197
AFFX-BioC-5_at 130.443 P 0.000296708
AFFX-BioC-3_at 148.898 P 4.42873e-05
AFFX-BioDn-5_at 300.389 P 9.4506e-05
AFFX-BioDn-3_at 740.342 P 0.000126798
AFFX-CreX-5_at 1378.56 P 4.42873e-05
AFFX-CreX-3_at 2588.83 P 5.16732e-05
AFFX-DapX-5_at 23.6953 P 0.00556451
AFFX-DapX-M_at 67.7171 P 0.000856509
AFFX-DapX-3_at 135.281 P 0.000753643
AFFX-LysX-5_at 1.76428 A 0.617401
AFFX-LysX-M_at 18.8402 A 0.313723
AFFX-LysX-3_at 23.378 P 0.00933744
AFFX-PheX-5_at 19.6027 P 0.0464816
AFFX-PheX-M_at 2.25564 A 0.876448
AFFX-PheX-3_at 23.4289 A 0.165861
AFFX-ThrX-5_at 9.52597 A 0.559354
AFFX-ThrX-M_at 26.0949 P 0.0396608

Total number of rows: 22840

Table truncated, full table size 783 Kbytes.




Supplementary file Size Download File type/resource
GSM398261.CEL.gz 2.1 Mb (ftp)(http) CEL
GSM398261.CHP.gz 123.8 Kb (ftp)(http) CHP
Raw data provided as supplementary file
Processed data included within Sample table
Processed data provided as supplementary file

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