Concept
Innate immunity
8 studies1 discovery
Innate immunity is the rapid, germline-encoded defence system that recognises conserved microbial features and tissue damage.
Innate immunity is the rapid defence layer shared across animals (and beyond) in the curriculum.
Studies
8
Findings
5
7 supporting · 0 challenging · 0 qualifying citations
Open tensions
1
Currently
What we know
- Multiple empirical papers in this library examine innate immunity with mechanistic biological findings.
- Hundreds of DEGs separate disease from healthy; healthy vs adjacent are more similar.
- Infection and type I/II IFN coordinately reduce sterol-pathway transcripts and metabolites via IFNAR1/Tyk2 signaling and lowered SREBP2. Antiviral effects of pathway blockade depend on mevalonate/geranylgeraniol, not cholesterol rescue.
- Large transcriptome with many immune effectors and pathway annotations (hepcidin, lysozyme, RAG).
- OMVs carry PRR ligands (e.g., PG for NOD1/NOD2) enabling bacteria–host communication across mucus; they modulate epithelial innate responses and barrier functions.
Largest unresolved question
Systems and scales differ across innate immunity studies (species, tissues, methods), so mechanisms should not be over-generalised.
Common misconceptions
Innate immunity findings from one model organism always transfer to humans.
Model systems teach mechanism; transfer to other species is a separate empirical claim.
Related
Claim ledger
What the evidence shows
Drawn from 8 studies in this library. Mix labels say which citation roles are present; they are not a strength score. Supports means evidence for a finding; Challenges means evidence against a stated position; Qualifies marks scope.
Multiple empirical papers in this library examine innate immunity with mechanistic biological findings.
- Coral gene expression in white syndromes
- How interferon throttles sterol synthesis in antiviral defense
- Immune transcriptome of bacteria-challenged sea bass
Study Role Design N Population Outcome Coral gene expression in white syndromes Supports OtherRNA-seq of white-syndrome disease, adjacent, and healthy Acropora hyacinthus tissues N=16 · Fragments from 16 colonies; analyses with n=8 per tissue group Reef-building coral Acropora hyacinthus colonies in Palau Differentially expressed genes separating diseased from healthy coral tissue How interferon throttles sterol synthesis in antiviral defense Supports Animal / in-vitroMacrophage time-series, lipidomics, IFN receptor knockouts, and murine CMV infection models Multi-assay mouse/cell study — no single primary analytic N in stored text Primary bone-marrow–derived macrophages and mice (including IFNAR1/Tyk2 models) Interferon-mediated sterol-pathway down-regulation in antiviral defense Immune transcriptome of bacteria-challenged sea bass Supports Animal / in-vitroRNA-seq of head kidney/spleen from bacteria-challenged vs mock-challenged sea bass Tissue RNA pooled from 15 fishes per preparation — no unpooled individual analytic N Lateolabrax japonicus (Japanese sea bass) Immune-related transcriptome after bacterial challenge Hundreds of DEGs separate disease from healthy; healthy vs adjacent are more similar.
Infection and type I/II IFN coordinately reduce sterol-pathway transcripts and metabolites via IFNAR1/Tyk2 signaling and lowered SREBP2. Antiviral effects of pathway blockade depend on mevalonate/geranylgeraniol, not cholesterol rescue.
Large transcriptome with many immune effectors and pathway annotations (hepcidin, lysozyme, RAG).
OMVs carry PRR ligands (e.g., PG for NOD1/NOD2) enabling bacteria–host communication across mucus; they modulate epithelial innate responses and barrier functions.
Debates
Tensions and limits
Some items are genuine disagreements on the same question. Others mark different assays, populations, or outcomes.
Systems and scales differ across innate immunity studies (species, tissues, methods), so mechanisms should not be over-generalised.
Systems and scales differ across innate immunity studies (species, tissues, methods), so mechanisms should not be over-generalised.
- Coral gene expression in white syndromes
- How interferon throttles sterol synthesis in antiviral defense
- Immune transcriptome of bacteria-challenged sea bass
Study Role Design N Population Outcome Coral gene expression in white syndromes Supports OtherRNA-seq of white-syndrome disease, adjacent, and healthy Acropora hyacinthus tissues N=16 · Fragments from 16 colonies; analyses with n=8 per tissue group Reef-building coral Acropora hyacinthus colonies in Palau Differentially expressed genes separating diseased from healthy coral tissue How interferon throttles sterol synthesis in antiviral defense Supports Animal / in-vitroMacrophage time-series, lipidomics, IFN receptor knockouts, and murine CMV infection models Multi-assay mouse/cell study — no single primary analytic N in stored text Primary bone-marrow–derived macrophages and mice (including IFNAR1/Tyk2 models) Interferon-mediated sterol-pathway down-regulation in antiviral defense Immune transcriptome of bacteria-challenged sea bass Supports Animal / in-vitroRNA-seq of head kidney/spleen from bacteria-challenged vs mock-challenged sea bass Tissue RNA pooled from 15 fishes per preparation — no unpooled individual analytic N Lateolabrax japonicus (Japanese sea bass) Immune-related transcriptome after bacterial challenge
PaperFren reads this as a limit on how far one study travels — different assays, populations, or outcomes — not a forced fight between papers.
Timeline
How understanding moved
Study years are when the paper was published. Evidence edits are dated changes to this page's claims. Explanations are when PaperFren added a Discovery — not a claim that the science happened that day.
2026
Concept page published
Innate immunity
- A methylation mark separated regulatory T cells that last from ones that do not
Change log
What changed
Dated edits to this page's evidence: studies added or removed from a claim, claims added or withdrawn, and new explanations tagged here. Coverage edits are distinct from reviewed research changes and corrections. Dates record PaperFren updates; study publication dates appear in the timeline.
- A methylation mark separated regulatory T cells that last from ones that do notEvidence: Strengthening
- Coverage updated · Concept page published
Papers
8 studies in this library bear on Innate immunity, ordered by citations.
- Which sensor starts IFN against SARS-CoV-2 in lung cells?
SARS-CoV-2 triggers delayed IFN mainly via MDA5/LGP2 sensing of viral intermediates, with IRF3/IRF5/NF-κB p65 as key TFs.
- Was innate immunity already complex in early animals?
Anthozoan cnidarians retain much ancestral metazoan immune/signaling complexity; flies and worms lost many components.
- How interferon throttles sterol synthesis in antiviral defense
Type I interferon couples viral sensing to down-regulation of the sterol pathway’s mevalonate–isoprenoid arm, limiting viral growth.
- Plant TIR domain binds viral elicitor
Tobacco N protein’s TIR domain is critical for association with TMV p50 elicitor.
- Coral gene expression in white syndromes
White-syndrome lesions in Acropora hyacinthus show distinct innate-immunity–related expression versus healthy tissue.
- Chicken β-defensin gene cluster
Chicken genome encodes 13 β-defensin (Gal) genes in a single innate-immunity cluster.
- How do E. coli vesicles talk to gut epithelium?
Outer membrane vesicles from probiotic and commensal E. coli deliver ligands that activate NOD1-mediated immune responses in intestinal epithelial cells.
- Immune transcriptome of bacteria-challenged sea bass
Deep RNA-seq of bacteria-challenged Lateolabrax japonicus reveals innate immune genes.
Compare studies
Select 2–10 studies. Design and N are labels, not a ranking.
Nothing selected yet.
Questions
What is still open
Systems and scales differ across innate immunity studies (species, tissues, methods), so mechanisms should not be over-generalised.
Ask PaperFren about Innate immunity
Study this conceptflashcards and short-answer questions
What is Innate immunity?
Innate immunity is the rapid, germline-encoded defence system that recognises conserved microbial features and tissue damage.
Why does Innate immunity matter for biology undergraduates?
Innate immunity is the rapid defence layer shared across animals (and beyond) in the curriculum.
Flashcards
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