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This study presents the chromosome-level genome assembly of the bone-eating worm Osedax fenrisi, comprising a 699.06 megabase sequence with 8 chromosomal pseudomolecules and a fully assembled mitochondrial genome. Through gene annotation and metagenomic binning, researchers identified over 12,900 protein-coding genes and recovered four high-quality microbial genomes from the worm's symbiotic community.

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Abstract

We present a genome assembly from an individual Osedax fenrisi (bone-eating worm; Annelida; Polychaeta; Sabellida; Siboglinidae). The genome sequence has a total length of 699.06 megabases. Most of the assembly (96.07%) is scaffolded into 8 chromosomal pseudomolecules. The mitochondrial genome has also been assembled, with a length of 20.29 kilobases. Gene annotation of this assembly by Ensembl identified 12 909 protein-coding genes. From the metagenome data, we recovered 11 bins, of which four were high-quality MAGs. The genomic data will provide a foundation for studying symbiotic nutrient acquisition, bone-degradation mechanisms, and the ecological roles of bone-eating worms in deep-sea carbon and nitrogen cycling.

Key findings

  • The Osedax fenrisi genome is 699.06 megabases long with 96.07% scaffolded into eight chromosomal pseudomolecules.
  • Gene annotation revealed 12,909 protein-coding genes within the worm's nuclear genome.
  • Metagenomic analysis successfully recovered four high-quality microbial genomes (MAGs) from the associated symbiotic community.

Keywords

MetagenomicsGenomeSequence assemblyWhole genome sequencingGeneticsGenome project

Identifiers

DOI
10.12688/wellcomeopenres.26048.1
Journal
Wellcome Open Research
Year
2026