A high-throughput CRISPR interference screen for dissecting functional regulators of GPCR/cAMP signaling

Autoři: Khairunnisa Mentari Semesta aff001;  Ruilin Tian aff002;  Martin Kampmann aff002;  Mark von Zastrow aff005;  Nikoleta G. Tsvetanova aff001
Působiště autorů: Department of Pharmacology and Cancer Biology, Duke University, Durham, North Carolina, United States of America aff001;  Institute for Neurodegenerative Diseases, Department of Biochemistry and Biophysics, University of California, San Francisco, California, United States of America aff002;  Chen-Zuckerberg Biohub, San Francisco, California, United States of America aff003;  Biophysics Graduate Program, University of California, San Francisco, California, United States of America aff004;  Department of Psychiatry, University of California, San Francisco, California, United States of America aff005;  Department of Cellular & Molecular Pharmacology, University of California, San Francisco, California, United States of America aff006
Vyšlo v časopise: A high-throughput CRISPR interference screen for dissecting functional regulators of GPCR/cAMP signaling. PLoS Genet 16(10): e32767. doi:10.1371/journal.pgen.1009103
Kategorie: Research Article
doi: 10.1371/journal.pgen.1009103


G protein-coupled receptors (GPCRs) allow cells to respond to chemical and sensory stimuli through generation of second messengers, such as cyclic AMP (cAMP), which in turn mediate a myriad of processes, including cell survival, proliferation, and differentiation. In order to gain deeper insights into the complex biology and physiology of these key cellular pathways, it is critical to be able to globally map the molecular factors that shape cascade function. Yet, to this date, efforts to systematically identify regulators of GPCR/cAMP signaling have been lacking. Here, we combined genome-wide screening based on CRISPR interference with a novel sortable transcriptional reporter that provides robust readout for cAMP signaling, and carried out a functional screen for regulators of the pathway. Due to the sortable nature of the platform, we were able to assay regulators with strong and moderate phenotypes by analyzing sgRNA distribution among three fractions with distinct reporter expression. We identified 45 regulators with strong and 50 regulators with moderate phenotypes not previously known to be involved in cAMP signaling. In follow-up experiments, we validated the functional effects of seven newly discovered mediators (NUP93, PRIM1, RUVBL1, PKMYT1, TP53, SF3A2, and HRAS), and showed that they control distinct steps of the pathway. Thus, our study provides proof of principle that the screening platform can be applied successfully to identify bona fide regulators of GPCR/second messenger cascades in an unbiased and high-throughput manner, and illuminates the remarkable functional diversity among GPCR regulators.

Klíčová slova:

Flow cytometry – G protein coupled receptors – Gene regulation – Genetic screens – Isoproterenol – Library screening – Regulator genes – cAMP signaling cascade


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