From life history to proteome via mutagenesis: an ecological footprint in genome evolution

Verdict. Tracing this signal from life history to proteome through mutagenesis could reveal how mutational pressure interacts with the fitness landscape, including the direction of molecular change and the extent to which proteins remain functional while following mutational biases. It intersects mitochondrial stress/dysfunction themes (mtDNA).

What the authors report

ABSTRACT Species differ in longevity, physiology, and social organization, and these properties expose them to distinct endogenous and environmental mutagens. Mutational spectra generated by these processes can shape downstream molecular evolution, influencing synonymous nucleotide composition, codon usage, and even amino acid composition.

Key results stated in the abstract include the following. Tracing this signal from life history to proteome through mutagenesis could reveal how mutational pressure interacts with the fitness landscape, including the direction of molecular change and the extent to which proteins remain functional while following mutational biases. Here, building on the recently identified age-associated mitochondrial A>G mutational signature in mammals, we test the universality of this signature and its downstream effects on genome and proteome evolution by comparing long-lived termites with short-lived non-termite cockroaches. We find that termite mtDNA exhibits a stronger A>G mutational signature than that of non-termite cockroaches, accompanied by coordinated shifts in synonymous nucleotide composition, codon usage, and amino acid composition.

Why it matters for mitochondrial biology

Within mitochondrial research, this work maps primarily to mtDNA. It is relevant to mitochondrial dysfunction discourse because the abstract invokes mtDNA. That does not by itself establish a validated disease mechanism; it indicates thematic proximity. Server: biorxiv. Posted 2026-08-19. Synthesis confidence is bounded by abstract completeness.

Study design (abstract-level)

The abstract does not cleanly separate methods from results. Treat design details as incomplete until the full preprint is inspected.

Principal findings

1. Tracing this signal from life history to proteome through mutagenesis could reveal how mutational pressure interacts with the fitness landscape, including the direction of molecular change and the extent to which proteins remain functional while following mutational biases.
2. Here, building on the recently identified age-associated mitochondrial A>G mutational signature in mammals, we test the universality of this signature and its downstream effects on genome and proteome evolution by comparing long-lived termites with short-lived non-termite cockroaches.
3. We find that termite mtDNA exhibits a stronger A>G mutational signature than that of non-termite cockroaches, accompanied by coordinated shifts in synonymous nucleotide composition, codon usage, and amino acid composition.
4. Our results show that ecological and life-history-associated mutational pressures can be transmitted through a hierarchy from mutational spectra to nucleotide composition and ultimately to proteome evolution.
5. Mitochondrial genomes may therefore function not only as records of ancestry but also as molecular archives of the biological conditions under which species evolve.

Limitations of this brief

• This Mitos brief is an abstract-level synthesis of a preprint; it is not peer review and not a substitute for reading the full paper.
• Preprint status: findings may change with revision or journal review.
• Effect sizes, n numbers, statistics, and full experimental controls are typically incomplete at abstract resolution.
• Comparator/control language is weak or absent in the abstract, limiting causal inference from this brief alone.
• Primary source: biorxiv DOI 10.64898/2026.08.14.744874 (posted 2026-08-19).

Open scientific questions

• Which specific experimental panels in the full paper establish the strongest causal claim, and how robust are the controls?
• Are mtDNA copy-number or mutation effects measured directly, or inferred from downstream phenotypes?
• How do these findings sit relative to prior literature on the same pathway—replication, contradiction, or incremental extension?

Bottom line

For mitochondrial biologists focused on mtDNA, this preprint is worth full-text review if the topic matches your program. Abstract-level takeaway: Tracing this signal from life history to proteome through mutagenesis could reveal how mutational pressure interacts with the fitness landscape, including the direction of molecular change and the extent to which proteins remain functional while following mutational biases. Confirm methods, effect sizes, and controls in the full PDF before citing the result as established.

Bibliographic record

Abstract-based editorial synthesis by Mitos. Not peer review.