JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Quantitative RT-PCR Gene Evaluation and RNA Interference in the Brown Marmorated Stink Bug.

The brown marmorated stink bug (Halyomorpha halys) has emerged as one of the most important invasive insect pests in the United States. Functional genomics in H. halys remains unexplored as molecular resources in this insect have recently been developed. To facilitate functional genomics research, we evaluated ten common insect housekeeping genes (RPS26, EF1A, FAU, UBE4A, ARL2, ARP8, GUS, TBP, TIF6 and RPL9) for their stability across various treatments in H. halys. Our treatments included two biotic factors (tissues and developmental stages) and two stress treatments (RNAi injection and starvation). Reference gene stability was determined using three software algorithms (geNorm, NormFinder, BestKeeper) and a web-based tool (RefFinder). The qRT-PCR results indicated ARP8 and UBE4A exhibit the most stable expression across tissues and developmental stages, ARL2 and FAU for dsRNA treatment and TBP and UBE4A for starvation treatment. Following the dsRNA treatment, all genes except GUS showed relatively stable expression. To demonstrate the utility of validated reference genes in accurate gene expression analysis and to explore gene silencing in H. halys, we performed RNAi by administering dsRNA of target gene (catalase) through microinjection. A successful RNAi response with over 90% reduction in expression of target gene was observed.

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