{
  "id": 3133030,
  "title": "Atypical MDM2 p53 Regulation and Chemosensitivity Induced by Proximal PAS Deletion",
  "url": "https://urgent.news/2026/08/24/atypical-mdm2-p53-regulation-and-chemosensitivity-induced-by-proximal",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-24T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.23.746494v1?rss=1"
  },
  "original_language": "en",
  "account": "A groundbreaking study proposes a unique approach to curtail cancer growth by altering the MDM2-p53 axis through Alternative Polyadenylation (APA). MDM2, a protein typically linked to tumor development, functions by attaching to and breaking down the tumor suppressor p53. In cancer cells, the use of proximal polyadenylation signals (PAS) in the MDM2 mRNA 3' untranslated region (3 UTR) leads to truncated transcripts. This allows oncogenic MDM2 to evade sequestration within the nucleus by structures known as Inverted Alu (IRAlu) double-stranded RNA. The researchers hypothesized that altering the PAS usage would prolong the MDM2 mRNA, encourage its nuclear retention, and suppress protein synthesis, thus reactivating p53. Utilizing CRISPR-Cas9, the team targeted and removed the most common proximal PAS in the MDM2 3 UTR of A549 cells. Following successful genome editing verification through PCR, Western blot analysis revealed a significant decrease in MDM2 expression in the edited cells. Interestingly, contrary to expectations, the edited cells displayed enhanced survival rates when exposed to doxorubicin, a common chemotherapy drug. Moreover, the study found a concurrent reduction in phosphorylated p53 (p-p53) levels, despite the lowered MDM2 expression. These unexpected outcomes suggest that MDM2 3 UTR elongation might initiate a non-conventional regulatory mechanism, potentially circumventing the usual MDM2-p53 relationship. The findings underscore the intricate nature of post-transcriptional regulation and suggest that APA-mediated gene manipulation can provoke unexpected compensatory survival strategies in cancer cells. This highlights the need for further exploration into the wider functional implications of elongated 3 UTRs.",
  "summary": "This study proposes a novel therapeutic strategy to suppress cancer growth by modulating the MDM2-p53 axis via Alternative Polyadenylation (APA). MDM2 normally promotes tumorigenesis by ubiquitinating and degrading the tumor suppressor p53. In cancer cells, preferential use of proximal polyadenylation signals (PAS) results in shortened 3'UTRs, allowing oncogenic transcripts like MDM2 to evade…",
  "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."
}