GSE50788

Pouch transcriptional differences between UC and FAP indicate altered immune response.

Whole-study status Not suitable

Dataset does not meet the current suitability threshold.

Whole-study downloads — these do not apply your sample requirements.

Selected cohort requirements

Samples meeting selected requirements: 0 cases / 0 controls

View matching samples

16 case / 20 control samples elsewhere in the study have incomplete or conflicting evidence; they are not included above

Patient pairs verified in indexed sample metadata: 0

A case/control comparison meeting these requirements is not confirmed.

Counts describe samples, not independent patients. Pair verification uses explicit subject identifiers in indexed sample metadata. Zero verified pairs does not establish that the study is unpaired; reported matched-normal design alone is insufficient.

Summary

A total proctocolectomy with ileal pouch-anal anastomosis (IPAA) is considered the surgery of choice for definitive management of familial adenomatous polyposis (FAP) and selected patients with ulcerative colitis (UC). However, this surgical treatment often associates with a long-term complication, pouchitis, which occurs mostly in UC patients. To better define the molecular background of pouchitis, the microarray-based survey was performed using pouch mucosal samples collected from 28 and 8 patients operated for UC and FAP, respectively. A number of 4771 genes was significantly differentiating uninflamed from inflamed mucosal samples, and their functional features were represented mostly by alerted metabolic and cell proliferation pathways. In contrast, functional analyses of aberrantly expressed probe sets between UC and FAP samples, irrespectively of mucosal inflammation status, revealed multiple pathways and terms which were linked to changes in immune response. Noteworthy, the comparison of uninflamed UC and FAP samples distinguished a set of 26 altered mRNAs including inflammation-related transcript encoding a Charcot-Leyden crystal (CLC) protein. The most discrete changes in gene expression profiles differentiating uninflamed UC and FAP mucosal samples were attributed to a Gene Ontology category innate immune response. Our study confirmed alterations of the immune responses as dominant in UC pouchitis which were earlier found in the studies using analyses of singular molecular elements. This observation may be important when managing IPAA patients.

Overall design

Each sample represents three biopsies taken from single patient, from the same areas of the lower part of the pouch mucosa (above the rectal cuff) during endoscopic examination. 28 patients underwent surgery for UC and 8 patients for FAP.

Source Evidence

4 sources
Source Contribution Status
GEO

Original dataset metadata, sample metadata, source links, and GEO data availability flags.

Sample records
36 GSM samples
Primary source
recount3

Planned trusted source for processed count availability.

No match found
Expression Atlas

Planned source for curated expression experiment links.

No match found
PubMed

Publication context when PubMed identifiers are already known.

No match found

Metadata Quality Components

Analysis Readiness

Ready after review
97% DE readiness

Contrast completeness

25/25 pts

Both case and control groups are present in the proposed grouping.

Minimum group size

20/20 pts

Each contrast group has at least 2 samples.

Processed data availability

20/20 pts

Processed data is marked available in the GEO index.

Sample decision clarity

15/15 pts

All samples are assigned to a case or control group.

Blocking warnings

7/10 pts

Warnings are present, but none are critical blockers.

Metadata normalization

10/10 pts

Metadata quality is high enough to support downstream handoff.

Blockers

No readiness blockers detected.

Next Steps

  • Verify the proposed sample assignments and case-versus-control comparison against the GEO metadata before using them in DESeq2 or another differential-expression tool.
  • Confirm processed count files and sample identifiers match the exported metadata.

Analysis Preparation Checklist

5/6 ready

Group labels reviewed

Needs review

Siftome proposed case and control labels, but no reviewer confirmation is stored yet.

Open the sample grouping CSV and confirm group labels before analysis.

Minimum sample count met

Ready

Both groups meet the minimum of 2 samples.

Confirm whether the cohort is large enough for the intended statistical analysis.

Processed counts available

Ready

Processed data availability is marked true in the GEO index.

Verify that downloaded processed files contain usable count or expression identifiers.

Ambiguous samples handled

Ready

No review-needed or unassigned samples are present in the proposed grouping.

Review the grouping table for biologically meaningful differences that the automated checks may not detect.

Exclusion decisions recorded

Ready

No hard-excluded samples were detected by the current rules.

Record any manual exclusions in the downstream analysis notes.

Source traceability preserved

Ready

The dataset and sample accessions can be traced back to GEO.

Keep GEO accessions with exported metadata.

Bioinformatician Review

Bioinformatician review required

Ask a bioinformatician to review grouping, count availability, exclusions, and design before DE.

Assay context may require expert handling before DESeq2-style analysis.

Why This Is Ranked Here

Tumor vs normal
Not suitable Dataset does not meet the current suitability threshold.

Applied Review Decisions

No active review decisions affect this ranking.

Derived Classifications

  • Assay differs from search intent Microarray Search intent expects bulk RNA-seq. Assay came from Normalization rules.
  • Disease context Ulcerative colitis Disease context came from Normalization rules.
  • Likely case group Inflamed tissue 16 samples
  • Likely control group Non-inflamed tissue 20 samples

Intent Interpretation

  • Downgrade or exclusion reason Downgraded assay: microarray cohorts are separated from the RNA-seq intent. Derived from current-intent ranking reasons.

Ranking Facts

Supporting evidence

  • Comparison: Disease/model vs control. Specimen: Tissue. Comparison suitability: 0%.
  • Interpreted disease metadata: Ulcerative colitis.
  • Processed data is available for downstream review.

Cautions

  • Downgraded assay: microarray cohorts are separated from the RNA-seq intent.
  • Disease/control design without a tumor/normal comparison is outside tumor/normal triage.
  • Microarray expression context downgraded below primary bulk RNA-seq for the default tissue ranking.
  • Overall score capped because comparison suitability is weak for the selected search intent.
  • Overall score capped because microarray cohorts should be compared separately from RNA-seq cohorts.
  • Comparison suitability score is below the Phase 1 recommended threshold.

Dataset Warnings

Normalized Fields

69 fields

Sample Group Preview

36 rows shown
Show Hide
Study totals: Case 16 | Control 20 | Unassigned 0 | Excluded 0 | Ambiguous 0 36 rows shown
Group Role Accession Title Source / characteristics Reason
Inflamed tissue Case GSM1229220 40 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229221 4 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229222 5 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229223 10 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229224 11 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229225 17 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229230 26 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229231 29 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229232 41 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229233 42 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229234 49 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229235 24 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229236 7 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229239 19 FAP_pouch mucosa Condition: Familial adenomatous polyposis (FAP); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229243 45 FAP_pouch mucosa Condition: Familial adenomatous polyposis (FAP); Inflammation status: Inflamed Case marker detected.
Inflamed tissue Case GSM1229244 46 FAP_pouch mucosa Condition: Familial adenomatous polyposis (FAP); Inflammation status: Inflamed Case marker detected.
Non-inflamed tissue Control GSM1229209 3 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229210 8 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229211 12 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229212 15 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229213 16 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229214 18 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229215 25 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229216 21 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229217 31 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229218 36 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229219 23 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229226 38 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229227 32 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229228 35 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229229 43 UC_pouch mucosa Condition: Ulcerative colitis (UC); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229237 13 FAP_pouch mucosa Condition: Familial adenomatous polyposis (FAP); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229238 14 FAP_pouch mucosa Condition: Familial adenomatous polyposis (FAP); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229240 22 FAP_pouch mucosa Condition: Familial adenomatous polyposis (FAP); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229241 37 FAP_pouch mucosa Condition: Familial adenomatous polyposis (FAP); Inflammation status: Uninflamed Control marker detected.
Non-inflamed tissue Control GSM1229242 44 FAP_pouch mucosa Condition: Familial adenomatous polyposis (FAP); Inflammation status: Uninflamed Control marker detected.

Use as Discovery Cohort

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Carry Siftome's disease, organism, specimen, assay, data type, and accession into a validation project. Uncertain fields remain Unknown.