Draft genome of the European medicinal leech Hirudo medicinalis (Annelida, Clitellata, Hirudiniformes) with emphasis on anticoagulants
Research article published in Scientific reports (2020)
Abstract
The European medicinal leech has been used for medicinal purposes for millennia, and continues to be used today in modern hospital settings. Its utility is granted by the extremely potent anticoagulation factors that the leech secretes into the incision wound during feeding and, although a handful of studies have targeted certain anticoagulants, the full range of anticoagulation factors expressed by this species remains unknown. Here, we present the first draft genome of the European medicinal leech, Hirudo medicinalis, and estimate that we have sequenced between 79-94% of the full genome. Leveraging these data, we searched for anticoagulation factors across the genome of H. medicinalis. Following orthology determination through a series of BLAST searches, as well as phylogenetic analyses, we estimate that fully 15 different known anticoagulation factors are utilized by the species, and that 17 other proteins that have been linked to antihemostasis are also present in the genome. We underscore the utility of the draft genome for comparative studies of leeches and discuss our results in an evolutionary context.
Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.
Summary
The first draft genome of Hirudo medicinalis, covering an estimated 79–94% of the genome, is used to identify 15 known anticoagulation factors plus 17 additional antihemostatic proteins, supporting comparative and evolutionary studies of leeches.
Why This Matters for Hirudotherapy
This study presents the first draft genome of the European medicinal leech Hirudo medicinalis, covering an estimated 79–94% of the full genome, and uses BLAST-based orthology searches and phylogenetic analyses to identify anticoagulation factors encoded within it. The authors report 15 known anticoagulation factors and 17 additional proteins linked to antihemostasis, offering the most comprehensive genomic inventory to date of the molecular agents underlying this species' therapeutic utility. For hirudotherapy and the study of the leech salivary secretome, this resource is foundational, enabling comparative genomic studies across leech species and informing mechanistic understanding of how H. medicinalis achieves its potent anticoagulant effects during feeding. However, the identified candidates are based on sequence homology and bioinformatic prediction rather than functional validation or demonstrated secretion, and the genome remains incomplete (up to ~21% unsequenced). The study does not assess protein expression, activity, or clinical efficacy, so the relevance is primarily as a reference genome and a roadmap for future functional work.
Citation
Reference (Vancouver style)
Kvist S, Manzano-Marín A, de Carle D, Trontelj P, Siddall ME. Draft genome of the European medicinal leech Hirudo medicinalis (Annelida, Clitellata, Hirudiniformes) with emphasis on anticoagulants. Sci Rep. 2020;10(1):9885. doi:10.1038/s41598-020-66749-5. PMID: 32555498
Bibliographic details (authors, volume, pages, DOI) are taken from the PubMed record.
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