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An HSV-1-H129 amplicon tracer system for rapid and efficient monosynaptic anterograde neural circuit tracing. | LitMetric
Monosynaptic viral tracers are essential tools for dissecting neuronal connectomes and for targeted delivery of molecular sensors and effectors. Viral toxicity and complex multi-injection protocols are major limiting application barriers. To overcome these barriers, we developed an anterograde monosynaptic H129 tracer system based on HSV-1 strain H129. The H129 tracer system consists of two components: an H129-dTK-T2-pac helper which assists H129 tracer's propagation and transneuronal monosynaptic transmission. The shared viral features of tracer/helper allow for simultaneous single-injection and subsequent high expression efficiency from multiple-copy of expression cassettes in H129 tracer. These improvements of H129 tracer system shorten experiment duration from 28-day to 5-day for fast-bright monosynaptic tracing. The lack of toxic viral genes in the H129 tracer minimizes toxicity in postsynaptic neurons, thus offering the potential for functional anterograde mapping and long-term tracer delivery of genetic payloads. The H129 tracer system is a powerful tracing tool for revealing neuronal connectomes.
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