Build Meta-analyses From Linked Results

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 Long Analysis Plan

Evidence Gap First

The query targets CorE and CorS, the copper-responsive ECF sigma/anti-sigma pair of M. xanthus, but none of the supplied claim-level records cover copper stress, CorE, CorS, or copper homeostasis. The closest supported sigma-factor evidence is sigB, a development-specific sigma factor whose deletion collapses late myxospore maturation (spore counts fall from 10.8 to 0.7 at 246 hr in wild-type vs mutant) sigB loss defects late spore maturation. Any honest meta-analysis must state this gap explicitly rather than infer copper regulation from unrelated sigma biology. The only cross-species sigma-regulation insight supplied is from B. subtilis, where an inhibitor weakens sigma-core binding during sporulation Sigma-core binding inhibitor during sporulation — a hypothesis worth testing computationally for CorE, but not evidence for it.

Analysis Plan

• Retrieval layer: Programmatic PubMed/EuropePMC sweep for (CorE OR CorS) AND copper AND Myxococcus; extract claim-level units (promoter regulons, Cu²⁺ MIC shifts, RNA-seq of ΔcorE under copper).
• Comparative genomics: Locate corE/corS loci across myxobacteria with Biopython; align ECF sigma domains; predict CorE-regulated promoters via motif discovery (position-weight matrices from known σ^ECF motifs).
• Quantitative synthesis: Pool spore-yield and viability data across development mutants (sigB, pkn2 strains) with random-effects meta-analysis in statsmodels; heterogeneity via I². Reported contrasts: Δpkn2 yields 4.1x10⁷ vs 1.0x10⁸ wild-type spores; overexpression delays fruiting to 80 hr Pkn2 negative regulator of development.
• Hypothesis test (in silico): Test whether CorE-controlled copper genes co-express with late-development sigma regulons using published transcriptomic data; falsifiable if copper stress regulons are independent of developmental sigma networks.

Confidence note: high confidence that the supplied corpus lacks CorE/CorS data; the sigB synthesis rests on single-study, single-strain time-courses (moderate strength), so no pooled copper effect size can yet be computed.