Lanthanide-dependent methylotrophy is widespread and soil-linked

Claim

Lanthanide-dependent methanol oxidation appears to be much more widespread than the calcium-dependent canonical pathway in the BERDL pangenome, and its strongest broad environmental signal is soil/sediment rather than only rare-earth-impacted sites.

Review Brief

What changed: this claim adds genomic rare-earth biology to an Atlas area that previously emphasized missing REE fitness data.

Why review matters: reviewers should decide whether the pangenome marker evidence is strong enough to guide rare-earth experiment design, while keeping direct REE fitness as an explicit gap.

Evidence to inspect:

• xoxF versus mxaF prevalence across the pangenome.
• Family-weighted and mixed-model checks that reduce phylogenetic overcounting.
• Soil/sediment enrichment for xoxF.
• Marker-source disagreements for lanM, xoxJ, Bakta, eggNOG, and KO annotations.

Questions for reviewers:

• Is the claim wording too broad, or does it correctly say "methylotrophy marker evidence" rather than measured REE fitness?
• Which marker source should be treated as canonical for lanmodulin and xox-family screening?
• Should the REE-AMD case study be treated as negative evidence for methylotrophy at contaminated rare-earth sites, or only as a site-specific stress signal?
• What taxon or condition should be prioritized for the first REE RB-TnSeq experiment?

Evidence

lanthanide_methylotrophy_atlas reports an xoxF:mxaF ratio of about 19:1 across 293K genomes, with family-equal-weight and mixed-model checks supporting the direction of the result. It also reports soil/sediment enrichment for xoxF and a descriptive REE-AMD case study where acidophile and metal-stress functions dominate over methylotrophy.

Why It Matters

This changes the rare-earth section of the Atlas from "zero direct fitness coverage" to a richer state: direct REE RB-TnSeq is still missing, but pangenome marker evidence now identifies candidate taxa, environments, marker pitfalls, and specific experiments.

Caveats

Marker source matters. The project finds that eggNOG Preferred_name='lanM' is unreliable, that KO K02030 is non-specific for xoxJ, and that Bakta and eggNOG disagree for several REE markers. Direct REE fitness phenotyping remains absent.

Promotion Criteria

Promote this claim only after a reviewer confirms the marker definitions and agrees that the claim is about genomic potential and environmental enrichment, not direct rare-earth-dependent fitness.