{
  "id": 13146671,
  "title": "Punctuated mutagenesis promotes multi-step evolutionary adaptation in human cancers",
  "url": "https://urgent.news/2026/10/09/punctuated-mutagenesis-promotes-multi-step-evolutionary-adaptation-in",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-09T00:00:00.000Z",
  "source": {
    "name": "eLife",
    "slug": "elife",
    "url": "https://elifesciences.org/articles/108058"
  },
  "original_language": "en",
  "account": "Recent studies have suggested that cancer genomes undergo rapid, sporadic mutations rather than a slow, steady accumulation over time. However, the impact of these punctuated events on the subsequent evolution of tumors is still not fully understood. In this study, researchers sought to examine how non-gradual mutagenesis influences a tumor cell's capacity to acquire and maintain beneficial adaptations.\n\nThe findings indicate that punctuated mutagenesis plays a significant role in promoting adaptation in cases where multiple mutations are necessary for progress. This is particularly true when these mutations individually are detrimental, but collectively provide a fitness advantage. By increasing the likelihood that several mutations occur in rapid succession, punctuated events boost the chances that a mutant organism navigating through a fitness valley—where no single mutation is beneficial—will subsequently evolve into a more fit state before succumbing to extinction.\n\nThe researchers analyzed data from The Cancer Genome Atlas to explore the relationship between cancer genomes with punctuated mutagenesis signatures, specifically the APOBEC mutagenesis. This particular form of mutagenesis has been observed to occur in episodic bursts. The analysis revealed patterns in tumor genomes with such signatures that are consistent with a higher rate of crossing fitness valleys, where multiple adaptive mutations are required for survival.\n\nFurthermore, the study delved into the interplay between enhanced adaptation abilities due to punctuated mutagenesis and the limiting effects of clonal interference—a phenomenon where different tumor subclones compete for survival. By examining this interaction within complex fitness landscapes, the researchers were able to characterize the overall adaptability of tumors with punctuated mutagenesis, shedding light on the mechanisms through which these sporadic mutations contribute to evolutionary success in cancer cells.",
  "summary": "The rate of acquisition of genomic changes in cancer has been the topic of much discussion, with several recent investigations finding evidence of punctuated evolution instead of gradual accumulation of such changes. Despite forays into the description and quantification of these punctuated events, the effects of such changes on subsequent cancer evolution remain incompletely understood. Here we…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}