Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Spatial profiling of chromatin accessibility in formalin-fixed paraffin-embedded tissues

ABSTRACT: Despite the extensive collection of formalin-fixed paraffin-embedded (FFPE) specimens, molecular tools for their in-depth analysis remain limited. Here, we introduce spatial FFPE-ATAC-seq, a technique that enables chromatin accessibility profiling in archival FFPE tissues with spatial resolution. Applied to both human and mouse samples, this method revealed the complex spatial organization and distinct cellular architectures, unlocking the potential of FFPE samples for comprehensive epigenomic studies and human disease research.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE278007 | GEO | 2025/05/19

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Automated array-CGH optimized for archival formalin-fixed, paraffin-embedded tumor material

Project description:BACKGROUND: Array Comparative Genomic Hybridization (aCGH) is a rapidly evolving technology that still lacks complete standardization. Yet, it is of great importance to obtain robust and reproducible data to enable meaningful multiple hybridization comparisons. Special difficulties arise when aCGH is performed on archival formalin-fixed, paraffin-embedded (FFPE) tissue due to its variable DNA quality. Recently, we have developed an effective DNA quality test that predicts suitability of archival samples for BAC aCGH. METHODS: In this report, we first used DNA from a cancer cell-line (SKBR3) to optimize the aCGH protocol for automated hybridization, and subsequently optimized and validated the procedure for FFPE breast cancer samples. We aimed for highest throughput, accuracy, and reproducibility applicable to FFPE samples, which can also be important in future diagnostic use. RESULTS: Our protocol of automated array-CGH on archival FFPE ULS-labeled DNA showed very similar results compared with published data and our previous manual hybridization method. CONCLUSION: This report combines automated aCGH on unamplified archival FFPE DNA using non-enzymatic ULS labeling, and describes an optimized protocol for this combination resulting in improved quality and reproducibility.

2007-02-23 | GSE7122 | GEO

Targeted RNA-sequencing of aged archival formalin-fixed paraffin-embedded tissue samples

Project description: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. In the current study, we evaluated dose-dependent transcriptional changes from paired frozen and archival FFPE liver samples stored for over 20 years using targeted resequencing (TempO-Seq) and whole-genome RNA-seq methods. Samples were originally collected from male mice exposed to a reference chemical (dichloroacetic acid, DCA) at 0, 198, 313 and 427 mg/kg-day, (n=6/dose) by drinking water for 6 days. TempO-Seq showed high overlap in differentially expressed genes (DEGs) between matched FFPE and flash-frozen (FROZ) samples and concordance in fold-changes across the highest two dose levels of DCA vs. control (R2 ≥ 0.94). Similarly, high concordance in fold-changes was observed between TempO-Seq FFPE and RNA-seq FROZ results (R2 ≥ 0.92). Only 28 DEGs or fewer were identified in RNA-seq FFPE samples. Modeling of DCA-dependent changes in gene sets identified benchmark doses from TempO-Seq FROZ and FFPE samples that were within 1.4-fold of RNA-seq FROZ samples (93.9 mg/kg-d), whereas RNA-seq FFPE samples were 3.3-fold higher (310.3 mg/kg-d). This work demonstrates that targeted sequencing may provide a more robust method for quantifying gene expression profiles from aged archival FFPE samples.

2022-10-10 | GSE186113 | GEO

Dose-Response Analysis of RNA-Seq Profiles in Archival Formalin-Fixed Paraffin-Embedded (FFPE) Samples

Project description: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). Experimental treatments included di(2-ethylhexyl)phthalate (DEHP) and dichloroacetic acid (DCA) for the <2 and >20 year-old studies, respectively. Total RNA was ribodepleted and sequenced using the Illumina HiSeq platform. In the recent study, FFPE samples showed high concordance in total reads (98% vs FROZ), fold-change values of differentially expressed genes (DEGs) (R2 = 0.99), highly enriched target pathways (90% overlap with FROZ), and benchmark dose estimates for preselected target genes (-2% overall vs FROZ). In contrast, RNA-seq data from older FFPE samples had lower total reads (70% vs FROZ) and poor concordance in global DEGs and pathways. Despite a 99% loss of counts, dose responses were still evident for target genes in FFPE samples and positively correlated with paired FROZ samples. These findings highlight potential variability in the quality of RNA-seq data from FFPE samples. More recent FFPE samples were highly similar to FROZ samples in sequencing quality metrics, DEG profiles, and dose-response parameters, while further methods development is needed for older or lower-quality FFPE samples. This work should help broaden the use of archival resources in both chemical safety and translational science.

2016-08-30 | GSE78962 | GEO

Automated array-CGH optimized for archival formalin-fixed, paraffin-embedded tumor material

2010-06-12 | E-GEOD-7122 | biostudies-arrayexpress

Comprehensive Assessment of Concordance Between Fresh-frozen and Formalin-fixed Paraffin Embedded Tumour DNA Methylation using a Targeted Sequencing Approach

Project description:DNA methylation controls gene expression and is altered in many types of disease, including metastatic colorectal cancer. Studying this phenomenon in archival material such as formalin-fixed paraffin embedded (FFPE) tumour biopsies would represent a significant step in unlocking a previously unavailable source of data. Methylation at base-pair resolution has not been fully described in FFPE samples in the context of matched fresh frozen (FF) tumour material using a targeted next-generation sequencing approach. Here, we used three pairs of matched FFPE and FF samples, along with two cell lines in duplicate, to determine the extent of their similarity. We identified a “bowing” pattern in FFPE samples showing lower CpG proportion at the start of sequence reads, but found no evidence that this significantly affected methylation calls. We also found no significant increase in deamination, measured by C > T transitions, previously considered a result of cross-linking DNA by formalin fixation and a barrier to FFPE use in methylation studies. Finally, our method has shown sensitivity of between 60-70% based on positions also methylated in cell lines. This level is not affected by coverage, and we believe that FFPE material is useful as a tissue source for similar methylation studies.

2017-07-08 | GSE84171 | GEO

Profiling histone modifications in clinical archived formalin fixed paraffin embedded samples

Project description:Here, we present FACT-Seq, a highly sensitive method to decode the histone modifications in FFPE tissues. The FACT-Seq generates the high-quality chromatin profiles from both active and silent histone modifications with 1000 nuclei purified from a single FFPE tissue section, and reveals the disease-specific super enhancers in the FFPE archived human colorectal and human glioblastoma multiforme cancer tissue. In summary, the approach allows decoding the histone modifications that regulate gene expression in archival FFPE tissues with high sensitivity, in order to better understand epigenetic regulation in cancer and precision medicine.

2021-09-03 | GSE171758 | GEO

Spatially exploring RNA biology in archival formalin-fixed paraffin-embedded tissues

Project description:The capability to spatially explore RNA biology in formalin-fixed paraffin-embedded (FFPE) tissues holds transformative potential for histopathology research. Here, we present pathology-compatible deterministic barcoding in tissue (Patho-DBiT) by combining in situ polyadenylation and computational innovation for spatial whole transcriptome sequencing, tailored to probe the diverse RNA species in clinically archived FFPE samples. It permits spatial co-profiling of gene expression and RNA processing, unveiling region-specific splicing isoforms, and high-sensitivity transcriptomic mapping of clinical tumor FFPE tissues stored for five years. Furthermore, genome-wide single nucleotide RNA variants can be captured to distinguish malignant subclones from non-malignant cells in human lymphomas. Patho-DBiT also maps microRNA regulatory networks and RNA splicing dynamics, decoding their roles in spatial tumorigenesis. Cellular-level Patho-DBiT dissects the spatiotemporal cellular dynamics driving tumor clonal architecture and progression. Patho-DBiT stands poised as a valuable platform to unravel rich RNA biology in FFPE tissues to aid in clinical pathology evaluation.

2024-08-12 | GSE274641 | GEO

Single-cell RNA sequencing of breast cancer cells from fresh fixed (FF) and formalin-fixed paraffin-embedded (FFPE) tissue identified multi-ciliary cells

Project description:This study evaluates the feasibility of using formalin-fixed paraffin-embedded (FFPE) and fixed fresh (FF) breast carcinoma samples for single-cell RNA sequencing (scRNAseq), highlighting the potential of archival FFPE tissues in clinical research and retrospective studies.

2025-02-19 | GSE278793 | GEO

Spatial total RNA sequencing of formalin-fixed paraffin embedded tissue by Spatial Random-seq

Project description:Current spatial transcriptomic methods have been widely used to resolve gene expression; however, these methods are limited to fresh or fresh-frozen samples due to unsuccess of oligo(dT) primers in degraded RNA samples. Here we develop a spatial random-sequencing (spRandom-seq) technology for Formalin-fixed paraffin-embedded (FFPE) tissues by capturing full-length total RNAs with random primers. This approach provides a powerful spatial platform for clinical FFPE specimens and promises enormous applications in biomedicine.

2023-12-31 | GSE247881 | GEO

SnFFPE-Seq: towards scalable single nucleus RNA-seq of formalin-fixed paraffin-embedded (FFPE) tissues

Project description:Profiling cellular heterogeneity in formalin-fixed paraffin-embedded (FFPE) tissues is key to characterizing clinical specimens for biomarkers, therapeutic targets, and drug responses. Here, we optimize methods for isolating intact nuclei and single nucleus RNA-seq from FFPE tissues in the mouse brain, and demonstrate a pilot application to a human clinical specimen of lung adenocarcinoma. Our method opens the way to broad applications of snRNA-Seq to archival tissues, including clinical samples.

2022-08-31 | GSE211797 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

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