Perspectives on gene expression regulation techniques in Drosophila.

Gene expression regulation, including loss-of-function and gain-of-function assays, is a powerful method to study developmental and disease mechanisms. Drosophila melanogaster is an ideal model system particularly well-equipped with many genetic tools. In this review, we describe and discuss the gene expression regulation techniques recently developed and their applications, including the CRISPR/Cas9-triggered heritable mutation system, CRISPR/dCas9-based transcriptional activation (CRISPRa) system, and CRISPR/dCas9-based transcriptional repression (CRISPRi) system, as well as the next-generation transgenic system. The main purpose of this review is to provide the fly research community with an updated summary of newly developed gene expression regulation techniques and help the community to select appropriate methods and optimize the research strategy.

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