ArticleScience advances2026
Blood feeding triggers the terminal differentiation of precursor cells in tick salivary glands.
Article in Science advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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21 authors.
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Abstract
Ticks transmit a wide range of pathogens to humans. During blood feeding, they inject salivary proteins that suppress host immune responses, enabling prolonged feeding and pathogen transmission. A hallmark of this process is the dynamic reprogramming of salivary gene expression, known as the sialome switch. Here, we describe a previously unrecognized cellular mechanism underlying this phenomenon in two medically important tick species. Using integrated multi-omics and imaging approaches, we identified a conserved population of undifferentiated salivary gland precursor cells in unfed ticks. Upon host attachment, these precursors undergo terminal differentiation into specialized secretory subtypes through a conserved transcriptional and signaling framework that drives salivary gland activation and maturation. Unlike other blood-feeding arthropods, tick salivary glands dynamically remodel in response to host contact, producing saliva with a shifting composition. This study suggests the cellular basis of adult female tick salivary gland maturation and offers targets to disrupt feeding and pathogen transmission.
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