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Researchers developed a new screening method to identify sensory ion channels by combining CRISPRa gene activation technology with FM 1-43, a fluorescent dye that marks active cation channels. They validated this approach using allyl isothiocyanate (the pungent compound in wasabi and mustard) and its receptor TRPA1, demonstrating that cells overexpressing TRPA1 could be efficiently identified and separated from mixed cell populations using fluorescence-activated cell sorting (FACS). This technique offers a faster way to discover molecular receptors for sensory stimuli that remain unidentified.
Why it matters
Many sensory experiences, including responses to temperature, touch, and chemical irritants, still lack identified molecular targets. This screening method could accelerate the discovery of new sensory receptors, potentially leading to better understanding of pain, itch, and other sensations, which could inform development of therapeutic interventions for sensory disorders.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
The discovery of sensory ion channels, such as thermosensitive transient receptor potential (TRP) channels and mechanosensitive PIEZOs, have transformed our understanding of mammalian sensory biology. However, the sensory receptor landscape remains incomplete, as many physiologically relevant sensory stimuli still lack identified molecular targets. Here, we describe a novel screening strategy utilizing FM 1-43, a fluorescent marker for activity of various cation channels, with a CRISPRa library (MPCL) targeting multi-transmembrane domain proteins. We validate this method by focusing on allyl isothiocyanate (AITC) and its putative receptor TRPA1. Specifically, we show that CRISPRa-mediated overexpression of TRPA1 is sufficient for FM 1-43 labeling when co-treated with AITC. Furthermore, we show that using FM 1-43 and AITC, we can efficiently FACS enrich TRPA1-expressing cells from a pool of MPCL-expressing cells. Collectively, this presents a novel method for rapidly screening select cation-dependent sensory stimuli.
Source: A novel screening method using CRISPRa and FM 1-43 to identify cation channels