GEO DataSets

(Submitter supplied) Use of archival resources has been limited to date by inconsistent methods for genomic profiling of degraded RNA from formalin-fixed paraffin-embedded (FFPE) samples. RNA-seq offers a novel way to address this problem. In this study we evaluated transcriptomic dose responses using RNA-seq in paired FFPE and frozen (FROZ) samples from two archival studies in mice, one recent (<2 years old) and the other older (>20 years old). more...

Organism:

Mus musculus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL17021

80 Samples

Download data: TXT

(Submitter supplied) Formalin-fixed paraffin-embedded (FFPE) samples are the only remaining biological archive for many toxicological and clinical studies, yet their use in genomics has been limited due to variability in RNA quality from formalin fixation. Older FFPE samples, which often have highly degraded RNA, pose a particularly difficult technical challenge. Recent developments in probe-based targeted sequencing technologies show promise in addressing this issue, while also being more cost effective than traditional RNA-sequencing (RNA-seq) methods. more...

Organism:

Mus musculus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL17021

48 Samples

Download data: TXT

(Submitter supplied) Archival formalin-fixed paraffin-embedded (FFPE) tissue samples hold a wealth of transcriptomic information; however, little is known about potential artifacts. Previously, we identified a consistent shift in global RNA-sequencing profiles between matching frozen and FFPE samples. We hypothesized that this shift was from fixing fresh tissue in formalin. To test this idea, RNA-sequencing was performed on liver samples collected from male mice treated with 600 ppm of a reference chemical (phenobarbital, 600 ppm phenobarbital) or vehicle control for 7 days. more...

Organism:

Mus musculus; Rattus norvegicus

Type:

Expression profiling by high throughput sequencing

Platforms:

GPL25029 GPL21626 GPL17021

96 Samples

Download data: CSV, TXT

(Submitter supplied) Furan is a mouse and rat hepatocarcinogen. We sought to determine if furan-induced gene expression changes could be detected in paired fresh-frozen and formalin-fixed paraffin embedded (FFPE) samples using RNA-seq (polyA-enrichment protocol). All samples in this study (fresh-frozen, 18 hours in formalin, 3 weeks in formalin) were also examined using one- and two-colour microarrays and RNA-seq (ribo-depletion protocol) in order to determine the effect of the technology on gene expression profiles.

Organism:

Mus musculus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL13112

24 Samples

Download data: TXT

(Submitter supplied) Furan is a mouse and rat hepatocarcinogen. We sought to determine if furan-induced gene expression changes could be detected in paired fresh-frozen and formalin-fixed paraffin embedded (FFPE) samples using RNA-seq (ribo-depletion protocol). All samples in this study (fresh-frozen, 18 hours in formalin, 3 weeks in formalin) were also examined using one- and two-colour microarrays and RNA-seq (polyA-enrichment protocol) in order to determine the effect of the technology on gene expression profiles.

Organism:

Mus musculus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL13112

24 Samples

Download data: TXT

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

Organism:

Mus musculus

Type:

Expression profiling by array; Expression profiling by high throughput sequencing

Platforms:

GPL13112 GPL10787

122 Samples

Download data: TXT, XLSX

(Submitter supplied) Furan is a mouse and rat hepatocarcinogen. We sought to determine if furan-induced gene expression changes could be detected in paired fresh-frozen and formalin-fixed paraffin embedded (FFPE) samples using one-colour microarrays. All samples in this study (fresh-frozen, 18 hours in formalin, 3 weeks in formalin) were also examined using two-colour microarrays and RNA-seq (ribo-depletion and polyA-enrichment protocols) in order to determine the effect of the technology on gene expression profiles.

Organism:

Mus musculus

Type:

Expression profiling by array

Platform:

GPL10787

8 Samples

Download data: TXT

(Submitter supplied) Furan is a mouse and rat hepatocarcinogen. We sought to determine if furan-induced gene expression changes could be detected in paired fresh-frozen and formalin-fixed paraffin embedded (FFPE) samples using one-colour microarrays. To determine the effect of time-in-formalin on gene expression signatures we performed microarray analysis of livers that were fixed in formalin for 18 hours or 3 weeks. All samples (fresh-frozen, 18 hours in formalin, 3 weeks in formalin) were also examined using two-colour microarrays and RNA-seq (ribo-depletion and polyA-enrichment protocols) in order to determine the effect of the technology on gene expression profiles.

Organism:

Mus musculus

Type:

Expression profiling by array

Platform:

GPL10787

50 Samples

Download data: TXT

(Submitter supplied) Furan is a mouse and rat hepatocarcinogen. We sought to determine if furan-induced gene expression changes could be detected in paired fresh-frozen (GSE48644) and formalin-fixed paraffin embedded (FFPE; this study) samples using two-colour microarrays. To determine the effect of time-in-formalin on gene expression signatures we performed microarray analysis of livers that were fixed in formalin for 18 hours or 3 weeks. more...

Organism:

Mus musculus

Type:

Expression profiling by array

Platform:

GPL10787

16 Samples

Download data: TXT

(Submitter supplied) Low RNA yield and quality limit use of formalin-fixed paraffin-embedded (FFPE) tissue samples for genomic analyses. In this study, we evaluated methods to demodify RNA highly fragmented and crosslinked by formalin fixation. Primary endpoints were RNA recovery, RNA-sequencing quality metrics, and target gene responses to a reference chemical (phenobarbital, PB). Frozen mouse liver samples from control and PB groups (n=6/group) were divided and preserved for 3 months as follows: frozen (FR); 70% ethanol (OH); 10% buffered formalin for 18 hours followed by ethanol (18F); and 10% buffered formalin (3F). more...

Organism:

Mus musculus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL17021

96 Samples

Download data: TXT

(Submitter supplied) For decades, formalin-fixing and paraffin embedding (FFPE) has been routinely used to preserve tissue samples for histological analysis. Global gene expression analysis of these archival tissues has the potential to greatly advance research attempting to link perturbations in molecular pathways to disease outcome. We investigated 16-year-old FFPE mouse liver samples treated with phenobarbital and created a protocol for their analysis using Agilent gene expression arrays. more...

Organism:

Mus musculus

Type:

Expression profiling by array

Platform:

GPL13912

28 Samples

Download data: TXT

(Submitter supplied) BACKGROUND: Idiopathic Pulmonary Fibrosis (IPF) is a lethal lung disease of unknown etiology. A major limitation in transcriptomic profiling of lung tissue in IPF has been a dependence on snap-frozen fresh tissues (FF). In this project we sought to determine whether RNA-Seq could be used to identify IPF expression profiles from archived Formalin-Fixed Paraffin-Embedded (FFPE) lung fibrotic tissue. RESULTS: We isolated total RNA from 7 IPF and 5 control FFPE lung tissues (median archived time 6 years) and performed 50 bp paired-end sequencing on Illumina 2000 HiSeq. more...

Organism:

Homo sapiens

Type:

Expression profiling by high throughput sequencing

Platform:

GPL11154

11 Samples

Download data: TXT

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

Organism:

Homo sapiens

Type:

Expression profiling by array

Platforms:

GPL17230 GPL13369

160 Samples

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(Submitter supplied) Background and Aims Formalin-fixed, paraffin-embedded (FFPE) tissue is the most commonly available form of archived clinical specimens, which are often stored as thin sections on glass slides. RNA isolated from such archived section (AS) of FFPE tissue is more degraded compared to freshly cut (FC) FFPE section because of prolonged air exposure. In this study, we evaluated performance of transcriptome profiling-based disease classification in AS-FFPE tissue. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL17230

24 Samples

Download data: TXT

(Submitter supplied) Background and Aims Formalin-fixed, paraffin-embedded (FFPE) tissue is the most commonly available form of archived clinical specimens, which are often stored as thin sections on glass slides. RNA isolated from such archived section (AS) of FFPE tissue is more degraded compared to freshly cut (FC) FFPE section because of prolonged air exposure. In this study, we evaluated performance of transcriptome profiling-based disease classification in AS-FFPE tissue. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL13369

136 Samples

Download data: TXT

(Submitter supplied) Performance assayed with formalin-fixed, paraffin-embedded (FFPE) ovarian tumor tissues.

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6883

24 Samples

Download data: TXT

(Submitter supplied) Performance assayed with formalin-fixed, paraffin-embedded (FFPE) ovarian tumor tissues.

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6883

42 Samples

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

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6883

164 Samples

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(Submitter supplied) Cross-platform comparison between WG-DASL and IVT-based assays

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6883

8 Samples

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(Submitter supplied) Assay performance with mixed RNA samples

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL6883

18 Samples

Download data: TXT