{
  "id": 12478788,
  "title": "Gene transcriptional profiling to assess Chinook salmon osmoregulatory resilience to salinity challenges",
  "url": "https://urgent.news/2026/10/06/gene-transcriptional-profiling-to-assess-chinook-salmon",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-06T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.09.30.755653v1?rss=1"
  },
  "original_language": "en",
  "account": "Recent environmental shifts have posed significant threats to Pacific salmonids, however, genomic tools offer a means to evaluate their resilience against ongoing ecological changes. Moreover, as concerns for conservation and animal welfare intensify, non-invasive tissue sampling for evaluating wild species' physiological state is gaining traction. Nonetheless, limited research has compared the gene expression profiles of fish obtained through non-lethal and lethal sampling methods. In this study, researchers performed a comparative gene transcriptional profiling analysis using 28 quantitative PCR assays on an OpenArray platform, serving as a osmoregulatory stress transcriptional profiling chip. Fish samples were collected from Chinook salmon (Oncorhynchus tshawytscha) smolts exposed to freshwater (0 PSU), brackish water (15 PSU) or seawater (30 PSU) for 0 h, 24 h, and 72 h. The results indicated that most assays demonstrated higher qPCR amplification success in non-lethal gill biopsies and lethal gill tissues in comparison to other tissues. Furthermore, the study discovered a greater number of significant differences in transcript abundance in traditional lethal tissues as opposed to non-lethal tissues. As the duration of salinity exposure increased, the gene transcript levels were generally upregulated in seawater samples as compared to freshwater samples for both non-lethal and lethal tissues. Notably, the targeted genes for both non-lethal and lethal tissues showed a significant and positive correlation across time points. The findings of this research highlight the potential benefits of utilizing non-lethal tissue sampling methods to enhance Chinook salmon hatchery management, aid in determining optimal hatchery release times, and support future field applications aimed at safeguarding wild salmon populations.",
  "summary": "Given unprecedented environmental change, Pacific salmonids are becoming increasingly threatened; however, genomic technologies provide an opportunity to assess Pacific salmonid resilience to on-going environmental change. Also, given increasing conservation and animal welfare concerns, non-lethal tissue sampling is emerging for assessing the physiological status of wild species. Relatively few…",
  "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."
}