Genome editing-enabled HTS assays expand drug target pathways for Charcot-Marie-tooth disease.

Paradigms and Technologies

Abstract

Copy number variation resulting in excess PMP22 protein causes the peripheral neuropathy Charcot-Marie-Tooth disease, type 1A. To broadly interrogate chemically sensitive transcriptional pathways controlling PMP22 protein levels, we used the targeting precision of TALEN-mediated genome editing to embed reporters within the genetic locus harboring the Peripheral Myelin Protein 22 (Pmp22) gene. Using a Schwann cell line with constitutively high endogenous levels of Pmp22, we obtained allelic insertion of secreted bioluminescent reporters with sufficient signal to enable a 1536-well assay. Our findings from the quantitative high-throughput screening (qHTS) of several thousand drugs and clinically investigated compounds using this assay design both overlapped and expanded results from a previous assay using a randomly inserted reporter gene controlled by a single regulatory element of the Pmp22 gene. A key difference was the identification of a kinase-controlled inhibitory pathway of Pmp22 transcription revealed by the activity of the Protein kinase C (PKC)-modulator bryostatin.

Authors

Inglese, James; Dranchak, Patricia; Moran, John J; Jang, Sung-Wook; Srinivasan, Rajini; Santiago, Yolanda; Zhang, Lei; Guha, Rajarshi; Martinez, Natalia; MacArthur, Ryan; Cost, Gregory J; Svaren, John;

Keywords

  • Charcot-Marie-Tooth Disease/ genetics
  • Genome, Human
  • High-Throughput Nucleotide Sequencing
  • Humans

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