{
  "id": 5428123,
  "title": "Spatiotemporal expression of the zebrafish pax9 gene that is essential for median fin patterning",
  "url": "https://urgent.news/2026/09/03/spatiotemporal-expression-of-the-zebrafish-pax9-gene-that-is",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-03T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.02.748930v1?rss=1"
  },
  "original_language": "en",
  "account": "The zebrafish pax9 gene plays a crucial role in embryonic development and is linked to various human diseases. Although the mouse model has been widely used for Pax9 research, zebrafish has become an alternative vertebrate model for studying human diseases, such as cancers. The functions of the zebrafish pax9 gene in jaw and hematopoiesis have been explored, but its spatiotemporal expression and molecular mechanisms in other organs are not fully understood.\n\nRecent advancements in CRISPR-Cas9 technology have made it easier to study gene expression in zebrafish using non-homologous end joining (NHEJ). In this study, researchers generated pax9 knockin fish lines by introducing fluorescent proteins at the beginning of the pax9 coding region. They then examined pax9 expression throughout the organism's life, from early embryonic stages to adulthood. The study discovered pax9 expression in greater detail than previously reported, including its presence in the paired and median fins, where it marks anterior fin rays.\n\nFurthermore, researchers utilized knockin and knockout mutants to investigate the role of PAX9 in median fin patterning. The results showed that pax9 null mutants have an increased number of fin rays in the median fins, but no significant impact on paired fins. Therefore, the study concludes that PAX9 is essential for median fin patterning in zebrafish.",
  "summary": "PAX9 is an evolutionarily conserved paired-box transcription factor that is critical for embryonic development and human diseases. The mouse model has been predominantly used to investigate Pax9 functions. Zebrafish has emerged as a complementary vertebrate model for various human diseases, including cancers. Until recently, the functions of the zebrafish pax9 gene in jaw and hematopoiesis have…",
  "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."
}