Transcriptomic profiling and the first spatial expression analysis of candidate genes in the salivary gland of the East Asian medicinal leech, Hirudo nipponia
Kim JH, Lee CJ, Yu YS, Aryal YP, Kim S, Suh JY, Kim JY, Min SH, Cha IT, Lee HY, Shin SY, Cho SJ (2023) · Developmental and Comparative Immunology · n=0
Study Profile
- Design
- tissue-specific transcriptomic profiling of Hirudo nipponia salivary gland, teeth, and general head region using de novo transcriptome assembly; first spatial expression analysis using in-situ hybridization (Chungbuk National University, Republic of Korea, with Harvard MCZ and Korean institutions)
- Sample size (n)
- —
- Intervention
- De novo transcriptome assembly with tissue-specific comparison; in-situ hybridization of candidate genes in H. nipponia salivary gland
- Comparator
- Cross-tissue (salivary gland vs teeth vs head) and cross-species comparison with H. medicinalis
- Primary endpoint
- Identification and spatial localization of salivary-gland-specific anti-coagulant and immune-related genes
- Primary result
- Identified Hni-Antistasin, Hni-Ghilanten, Hni-Bdellin, Hni-Hirudin as anti-coagulant factors; novel Hni-GLIPR1 immune-related gene; first visualization of salivary-gland-specific gene expression sites via in-situ hybridization; expanded sialotranscriptome knowledge for H. nipponia
- Follow-up duration
- Not applicable
- PMID
- 38158145
Key Findings
- First spatial transcriptomic analysis of an East Asian medicinal-leech salivary gland
- Tissue-specific anti-coagulant gene cohort identified (Hni-Antistasin, Hni-Ghilanten, Hni-Bdellin, Hni-Hirudin)
- Novel immune-related Hni-GLIPR1 gene identified
- In-situ hybridization spatial validation provides cellular-resolution gene localization
- Complements Lu 2018 H. nipponia sialotranscriptome and Shi 2023 recombinant hirudin work
Limitations
- Transcriptomic + ISH only — no protein-level validation
- Limited sample size (small number of biological replicates)
- Cross-species comparison only with H. medicinalis (not H. manillensis or Whitmania)
- No clinical or therapeutic translation
- Hirudo nipponia is not the K040187 device leech
Clinical Implications
Kim 2023 advances the foundational pharmacology of Hirudo nipponia and provides a methodological template for spatial sialotranscriptomics across leech species. For ASH's scientific reference, the study complements existing H. nipponia entries (Lu 2018, Shi 2023) and supports the broader claim that Asian medicinal-leech species harbor anti-coagulant and immune-modulating bioactives distinct from H. medicinalis. No US K040187 clinical-practice implications.
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