GEO DataSets

(Submitter supplied) Peripheral blood is an accessible and informative source of transcriptomal information for many human disease and pharmacogenomic studies. While there can be significant advantages to analyzing RNA isolated from whole blood, particularly in clinical studies, the preparation of samples for microarray analysis is complicated by the need to minimize artifacts associated with highly abundant globin RNA transcripts. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL201

24 Samples

Download data: CEL, CHP

(Submitter supplied) RNA stabilizing reagents have been developed to ensure that transcription profiles of whole blood samples reflect the physiological state at the time of the blood drawn. Ability to preserve and maintain the in vivo gene expression status ex vivo is essential for gene expression profiling and biomarker discovery from clinical sample material. We compared transcriptional profiles obtained from samples collected using two established peripheral blood RNA collection systems, TEMPUS™ and PAXgene™. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL2700

14 Samples

Download data: TXT

(Submitter supplied) Microarray-based gene expression analysis of peripheral whole blood is a common strategy in the development of clinically relevant biomarker panels for a variety of human diseases. However, the results of such an analysis are often plagued by decreased sensitivity and reliability due to the effects of relatively high levels of globin mRNA in whole blood. Globin reduction assays have been shown to overcome such effects, but they require large amounts of total RNA and may induce distinct gene expression profiles. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platforms:

GPL6883 GPL8432

64 Samples

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(Submitter supplied) In this study we aimed to assess technical variability associated with globin depletion in addition to assessing general technical variability in RNA-Seq from whole blood derived samples. We compared technical and biological replicates having undergone globin depletion or not and found that globin depletion removed approximately 80% of globin transcripts, improved the correlation of technical replicates, allowed for reliable detection of thousands of additional transcripts and generally increased transcript abundance measures.

Organism:

Homo sapiens

Type:

Expression profiling by high throughput sequencing

Platform:

GPL11154

47 Samples

Download data: TXT

(Submitter supplied) Peripheral whole blood-based gene expression profiling has become one of the most common strategies exploited in the development of clinically relevant biomarkers. However, the ability to identify biologically meaningful conclusions from gene expression patterns in whole blood is highly problematic. First, it is difficult to know whether or not expression patterns in whole blood capture those in primary tissues. more...

Organism:

Mus musculus

Type:

Expression profiling by array

Platform:

GPL1261

36 Samples

Download data: CEL

(Submitter supplied) Room temperature whole blood mRNA stabilization procedures, such as the PAX gene system, are critical for the application of transcriptional analysis to population-based clinical studies. Global transcriptome analysis of whole blood RNA using microarrays has proven to be challenging due to the high abundance of globin transcripts that constitute 70% of whole blood mRNA in the blood. This is a particular problem in patients with sickle-cell disease, secondary to the high abundance of globin-expressing nucleated red blood cells and reticulocytes in the circulation . more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL570

30 Samples

Download data: CEL

(Submitter supplied) Transcriptome analysis is of great interest in clinical research, where significant differences between individuals can be translated into biomarkers of disease. Although next generation sequencing provides robust, comparable and highly informative expression profiling data, with several million of tags per blood sample, reticulocyte globin transcripts can constitute up to 76% of total mRNA compromising the detection of low abundant transcripts. more...

Organism:

Homo sapiens

Type:

Expression profiling by high throughput sequencing

Platform:

GPL10999

12 Samples

Download data: TXT

(Submitter supplied) Background: DNA microarrays provide a powerful method for global analysis of gene expression. The application of this technology to specific cell types and tissues, however, is typically limited by small amounts of available mRNA, thereby necessitating amplification. Here we compare microarray results obtained with two different methods of RNA amplification to profile gene expression in the C. elegans larval nervous system. more...

Organism:

Caenorhabditis elegans

Type:

Expression profiling by array

Platform:

GPL200

8 Samples

Download data: CEL, CHP

(Submitter supplied) Background: There are challenges in generating mRNA-Seq data from whole-blood derived RNA as globin gene and rRNA are frequent contaminants. Given the abundance of erythrocytes in whole blood, globin genes comprise some 80% or more of the total RNA. Therefore, depletion of globin gene RNA and rRNA are critical steps required to have adequate coverage of reads mapping to the reference transcripts and thus reduce the total cost of sequencing. more...

Organism:

Homo sapiens

Type:

Expression profiling by high throughput sequencing

Platform:

GPL20301

18 Samples

Download data: TXT

(Submitter supplied) This SuperSeries is composed of the SubSeries listed below.

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL570

48 Samples

Download data: CEL

(Submitter supplied) RNA isolation and purification steps greatly influence the results of gene expression profiling. There are two commercially available products for whole blood RNA collection, PAXgene and Tempus blood collection tubes, and each comes with their own RNA purification method. We examined the impact of RNA isolation methods on gene expression profiles. We demonstrated that peripheral blood RNA isoaltion can critically impact differential expression results, particularly in the clinical setting where fold-change differences are typically small and there is inherent variability within biological corhorts Keywords: micorarray quality assurance

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL570

20 Samples

Download data: CEL

(Submitter supplied) RNA isolation and purification steps greatly influence the results of gene expression profiling. There are two commercially available products for whole blood RNA collection, PAXgene and Tempus blood collection tubes, and each comes with their own RNA purification method. We examined the impact of RNA isolation methods on gene expression profiles. We demonstrated that peripheral blood RNA isoaltion can critically impact differential expression results, particularly in the clinical setting where fold-change differences are typically small and there is inherent variability within biological corhorts Keywords: micorarray quality assurance, phytohemagglutinin (PHA)

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL570

28 Samples

Download data: CEL

(Submitter supplied) This SuperSeries is composed of the SubSeries listed below.

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6244

34 Samples

Download data: CEL

(Submitter supplied) To determine differential gene expression in peripheral blood of asthmatic individuals undergoing allergen inhalation challenge, post-challenge compared to pre-challenge

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6244

18 Samples

Download data: CEL

(Submitter supplied) Detecting differential changes in the peripheral whole-blood transcriptome, post-challenge compared to pre-challenge; using non-globin reduced PAXgene (PAX.NGR) tubes Blood was collected immediately prior to, and two hours after challenge

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6244

8 Samples

Download data: CEL

(Submitter supplied) Detecting differential changes in the peripheral whole-blood transcriptome, post-challenge compared to pre-challenge; using globin reduced PAXgene (PAX.GR) tubes

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6244

8 Samples

Download data: CEL

(Submitter supplied) Background: Allergen inhalation challenge in mild asthmatics induces airflow obstruction, airway hyperresponsiveness and inflammation, providing a model for hypothesis-generating experiments to understand regulation of these responses. We have sought to evaluate the peripheral whole blood transcriptome, post-challenge compared to pre-challenge, and to determine the effect of globin mRNA reduction methodology. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6244

30 Samples

Download data: CEL

(Submitter supplied) #G017 Burn/Trauma Study. This is a Glue Grant Study comparison between gene expression analyses performed in eight trauma/burn subjects using either a buffy coat isolation of whole blood or using the PAXgene system Keywords: other

Organism:

Homo sapiens

Type:

Expression profiling by array

Dataset:

GDS917

Platform:

GPL96

16 Samples

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Comparison of RNA isolation from whole blood using the PAXgene system to that from leukocytes using the buffy coat procedure. Blood of healthy subjects and trauma patients examined. Results indicate that RNA isolated from whole blood produced more noise than that from leukocytes.

Organism:

Homo sapiens

Type:

Expression profiling by array, count, 2 protocol, 2 tissue sets

Platform:

GPL96

Series:

GSE1343

16 Samples

Download data

(Submitter supplied) Considerable variation in gene expression data from different DNA microarray platforms has been demonstrated. However, no characterization of the source of variation arising from labeling protocols has been performed. To analyze the variation associated with T7-based RNA amplification/labeling methods, aliquots of the Stratagene Human Universal Reference RNA were labeled using 3 eukaryotic target preparation methods and hybridized to a single array type (Affymetrix U95Av2). more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Dataset:

GDS1954

Platform:

GPL8300

20 Samples

Download data: CEL, EXP