Paper review grounded in raw data

Brief verdict

This Cell Death and Differentiation review maps fungal regulated cell death RCD systems onto mammalian necroptosis and pyroptosis, arguing that fungal NOD like receptors NLRs, HeLo/HELL 4HB homologs and fungal gasdermins fGSDMs form ancient, transkingdom RCD modules; key experimental anchors include cryo EM and crystal structures of fungal gasdermins and functional NLR amyloid signaling from Podospora and Neurospora (evidence summarized below)

Key evidence and claims (selected):

• Fungi encode abundant NLR like STAND proteins and HeLo HeLo like 4HB domains linked to membrane targeting, with experimental HeLo membrane activity documented Fungal
• fGSDMs are often genomically clustered with proteases and in two model systems fGSDMs form pores and are activated by proteases or allele coexpression; cryo EM structures of RCD 1 pores were reported fGSDM

Main appraisal: ambitious, well referenced, high conceptual payoff but limited by overreliance on a few model systems and inference from homology; recommends targeted functional tests across phyla and better cellular phenotyping (see long review)

Deep critical review Regulated cell death in fungi from a comparative immunology perspective

Overview

The review synthesizes genetic, structural, and functional data to argue that fungal regulated cell death (RCD) systems show deep evolutionary links with metazoan necroptosis and pyroptosis. It integrates work on heterokaryon incompatibility HI, fungal NOD like receptors NLRs, HeLo HeLo like membrane targeting domains, signaling amyloids (RHIM like PP motifs) and fungal gasdermins fGSDMs to propose a transkingdom comparative immunology framework for fungal immunity and RCD Paper

What the paper does well

• Comprehensive cross kingdom synthesis: It collects and weighs genetic (het genes, nwd and hnwd families), structural (PDB and cryo EM) and mechanistic evidence to show conserved modules across bacteria plants animals and fungi Trans
• Highlights molecular detail with structural anchors: cites AlphaFold modeling and specific PDB IDs including HeLo HET S structures and gasdermin pores (eg fGSDM structures 8JYZ) anchoring claims in resolved structures Structural
• Identifies testable genomic architecture patterns: points out frequent genomic clustering of fGSDMs with protease encoding genes and two three gene RCD clusters reminiscent of bacterial defense islands Genomic

Main concerns and limitations

1. Overgeneralization from few experimental systems The review relies heavily on Podospora anserina and Neurospora crassa HI systems and on heterologous expression experiments (eg fGSDMs in human 293T cells) and AlphaFold models; functional evidence across fungal diversity remains sparse which weakens broad claims of universality Limitations
2. Inference from homology without comprehensive cellular phenotypes Many parallels are domain or fold based (HeLo 4HB MLKL; RHIM like amyloids) but direct demonstration that the fungal modules produce the same ionic channels physiological disturbances or downstream immunomodulatory consequences in fungal tissues in vivo is limited Functional
3. Open causal questions about stimuli and regulation The review repeatedly flags that the stimuli recognized by the many fungal NLRs and protease sensors are unknown — this is a major gap in mechanistic understanding necessary to place fungal RCD in ecological and immunological context Unknown

Detailed evidence map (claims with verbatim extracts)

Practical implications and translational outlook

The author suggests that deciphering fungal RCD could enable new strategies to control pathogenic fungi important for human health and agriculture; that claim is plausible but speculative pending functional demonstration that manipulating fungal RCD can reduce pathogenicity in situ Translational

Concrete recommendations from this critique

1. Systematic functional surveys across fungal phyla: use genetic deletion or inducible activation of representative NLRs HeLo domains and fGSDMs in divergent species (basidiomycetes, early diverging fungi) while assaying cellular phenotypes membrane permeabilization ion flux ROS and mycovirus transmission rates.
2. Resolve physiological pore properties: reconstitute purified HeLo and fGSDM pores in defined bilayers and record ion selectivity conductance and gating kinetics to test MLKL like channel hypotheses.
3. Map activating triggers: biochemical screens for ligands PAMPs effectors or small molecules that trigger individual NLRs or protease sensors; mass spec of co purified ligands from activated complexes.
4. In vivo ecological tests: manipulate HI loci frequency in natural populations and test effects on mycovirus spread and fitness to validate the prophylactic defense hypothesis proposed in the review.

Blindspots and biases

The review acknowledges and the critique reiterates the following risks of overinterpretation: reliance on model systems including heterologous mammalian assays potential publication bias toward positive functional stories and the possibility that domain homology does not always produce identical cellular outcomes across taxa Acknowledged

Summary conclusion and confidence

The paper is high quality thoughtful and influential: it synthesizes diverse datasets to argue for conserved RCD logic across kingdoms. Its central claims are supported by strong structural and genetic evidence in a few systems, but generalizing these claims across Fungi requires broader functional validation. Confidence in the paper interpretation here is high for the descriptive evolutionary conclusions and moderate for functional universality (see how to falsify below) Paper

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