BGPT: Paper Review: Trained immunity and immune priming in plants and invertebrates

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Core takeaway

“Trained immunity” (mechanism-based, vertebrate-focused) and “immune priming” (phenomenon-based, plants & invertebrates) are presented as points on a continuum of innate immune memory, with cross-kingdom overlap in epigenetic and metabolic reprogramming, plus signaling and microbiota modulation.

Paper:

Long Explanation

Paper review (visual-first): Trained immunity and immune priming in plants and invertebrates

eLife • 05 Dec 2025 • DOI: 10.7554/eLife.106597

Role of this paper: narrative synthesis + conceptual clarification across kingdoms, explicitly comparing immune priming in plants/invertebrates with mechanistic “trained immunity” in vertebrates.

Cross-kingdom historical anchor points (from the paper’s narrative)

Years are taken from exemplars explicitly mentioned in the provided full text.

Conceptual map: definitions the paper builds on

A mechanistic “trained immunity” (vertebrate) is contrasted with a broader phenomenological “immune priming” (plants/invertebrates), while the paper treats them as potentially overlapping forms of innate immune memory.

The conceptual distinctions rely on the paper’s explicit definitions: immune priming is broadened phenomenologically (changed immune state after prior encounter), while trained immunity is used more narrowly as long-term functional reprogramming mediated by metabolic/epigenetic changes in vertebrate innate cells.
The multidimensional memory dimensions (strength/speed/extinction/duration/specificity) are attributed to prior memory conceptual work discussed by the paper.

What the review claims is “shared” vs “mechanistically variable”

Because this is a review/perspective, the most defensible “evidence summary” is qualitative: types of mechanisms reported and the authors’ uncertainty statements about what is homologous.

Epigenetics: the paper stresses DNA methylation/histone PTMs in plants and links to reprogramming in trained immunity; it also emphasizes that invertebrate epigenetic functions may differ substantially and that direct multi-omics evidence is often missing.
Metabolism: in vertebrates, trained immunity is linked to metabolic rewiring; cross-kingdom parallels are discussed, while direct proof in many invertebrate priming systems remains limited.
Signaling/systemic effects: plant systemic acquired resistance (SAR) is described as dual-branched signaling with SA/NPR1 and Pip/NO/ROS/AzA/G3P components and mobile signals.
Microbiota: plants are discussed with soil-microbiota legacy and ISR; in animals, gut microbiota can modulate priming, sometimes affecting specificity and cross-protection.

Scientific quality & critical scrutiny (skeptical review)

Strength (conceptual rigor): The review explicitly separates phenomenological immune priming from mechanistic trained immunity and foregrounds the multi-dimensional nature of “memory.” This reduces definitional conflation and clarifies what would count as evidence for homology vs analogy.
Strength (cross-kingdom integration): It organizes plant SAR/ISR, invertebrate immune priming/TGIP, and vertebrate innate memory using shared axes: epigenetics, metabolism, signaling, specificity, microbiota, evolution, and applications.
Key blind spot (causality across taxa): The paper repeatedly implies overlap (especially epigenetic/metabolic) but the mechanistic “trained immunity” criteria are difficult to demonstrate in most invertebrates, where multi-omics causality is often missing. The authors themselves flag this gap and argue that observed epigenetic/metabolic signatures may not be homologous across lineages.
Specificity is under-operationalized: “Specific immune priming” is discussed as occurring at organism level and potentially requiring receptor-effector specificity or other mechanisms. Yet, across many systems, heterologous vs homologous tests are not standardized, and mixtures of resistance vs tolerance can masquerade as “specificity.” This is not a flaw unique to this paper, but it is a recurring conceptual hazard.
Publication/selection bias risk: As with most narrative syntheses, the evidence base is skewed toward systems where priming/TGIP is measurable (and perhaps toward positive results). The paper acknowledges heterogeneity and conceptual pluralism, which partially mitigates over-claiming—but readers should still treat cross-kingdom “conserved mechanism” language as provisional.

What would most effectively falsify/reshape the review’s unifying claims?

These falsification targets follow the paper’s framing that trained immunity is mechanistically defined and that many invertebrate systems lack direct causal evidence for epigenetic/metabolic reprogramming and for cross-kingdom homology.

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Updated: March 21, 2026