Chemical modulation of transcriptionally enriched signaling pathways to optimize the conversion of fibroblasts into neurons

Joseph Herdy, Simon Schafer, Yongsung Kim, Zoya Ansari, Dina Zangwill, Manching Ku, Apua Paquola, Hyungjun Lee, Jerome Mertens, Fred H. Gage

Research output: Contribution to journalArticlepeer-review

Abstract

Direct conversion of human somatic fibroblasts into induced neurons (iNs) allows for the generation of functional neurons while bypassing any stem cell intermediary stages. Although iN technology has an enormous potential for modeling age-related diseases, as well as therapeutic approaches, the technology faces limitations due to variable conversion efficiencies and a lack of thorough understanding of the signaling pathways directing iN conversion. Here, we introduce a new all-in-one inducible lentiviral system that simplifies fibroblast transgenesis for the two pioneer transcription factors, Ngn2 and Ascl1, and markedly improves iN yields. Further, our timeline RNASeq data across the course of conversion has identified signaling pathways that become transcriptionally enriched during iN conversion. Small molecular modulators were identified for four signaling pathways that reliably increase the yield of iNs. Taken together, these advances provide an improved toolkit for iN technology and new insight into the mechanisms influencing direct iN conversion.

Original languageEnglish (US)
Article numbere41356
JournaleLife
Volume8
DOIs
StatePublished - May 2019
Externally publishedYes

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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