{
  "id": 18428599,
  "title": "Polymerase and primer biases in eukaryote ultra-long-read metabarcoding",
  "url": "https://urgent.news/2026/11/05/polymerase-and-primer-biases-in-eukaryote-ultra-long-read",
  "topic": "science",
  "section": "Science",
  "published": "2026-11-05T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.11.04.764338v1?rss=1"
  },
  "original_language": "en",
  "account": "Ultra-long-read metabarcoding is a cutting-edge technique for biodiversity monitoring that enables precise species identification and accurate taxonomic placement. This method relies on high-processivity DNA polymerases and primer pairs that adequately cover the targeted taxonomic groups. However, there is currently no published data on the effectiveness of commercial polymerase kits and primer pairs designed for ultra-long amplicons in eukaryotic DNA.\n\nTo address this gap, researchers conducted an experiment using PacBio sequencing to evaluate the performance of five top-rated high-processivity polymerases and three ultra-long marker primer pairs against a commonly used full-ITS primer pair. The study tested these tools on two mock communities and ten soil samples, measuring data quality and biodiversity recovery. The findings showed significant variations in performance between polymerases and primer pairs.\n\nBased on these results, the researchers recommend using either the Solis or Fusion polymerases, in combination with the Euk575F-21Rngs primer pair, for ultra-long-read metabarcoding analyses of soil eukaryotes. These recommendations are particularly relevant when the goal is to test evolutionary hypotheses. Furthermore, the study found that ultra-long amplicons produced substantially lower biodiversity levels than medium-sized, full-ITS amplicons across all taxonomic levels. This discrepancy suggests that medium-sized amplicons may be more suitable for routine soil eukaryote biodiversity monitoring than ultra-long amplicons.",
  "summary": "Ultra-long-read metabarcoding is a recently developed method for biodiversity monitoring that enables both high-accuracy species-level identification and reliable phylogenetic placement of taxa. Ultra-long-read analyses require high-processivity DNA polymerases for amplicons and primer pairs that fully cover the targeted taxonomic groups. So far, there is no published information on the relative…",
  "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."
}