Cell Reports (Mar 2021)

Functional enhancer elements drive subclass-selective expression from mouse to primate neocortex

  • John K. Mich,
  • Lucas T. Graybuck,
  • Erik E. Hess,
  • Joseph T. Mahoney,
  • Yoshiko Kojima,
  • Yi Ding,
  • Saroja Somasundaram,
  • Jeremy A. Miller,
  • Brian E. Kalmbach,
  • Cristina Radaelli,
  • Bryan B. Gore,
  • Natalie Weed,
  • Victoria Omstead,
  • Yemeserach Bishaw,
  • Nadiya V. Shapovalova,
  • Refugio A. Martinez,
  • Olivia Fong,
  • Shenqin Yao,
  • Marty Mortrud,
  • Peter Chong,
  • Luke Loftus,
  • Darren Bertagnolli,
  • Jeff Goldy,
  • Tamara Casper,
  • Nick Dee,
  • Ximena Opitz-Araya,
  • Ali Cetin,
  • Kimberly A. Smith,
  • Ryder P. Gwinn,
  • Charles Cobbs,
  • Andrew L. Ko,
  • Jeffrey G. Ojemann,
  • C. Dirk Keene,
  • Daniel L. Silbergeld,
  • Susan M. Sunkin,
  • Viviana Gradinaru,
  • Gregory D. Horwitz,
  • Hongkui Zeng,
  • Bosiljka Tasic,
  • Ed S. Lein,
  • Jonathan T. Ting,
  • Boaz P. Levi

Journal volume & issue
Vol. 34, no. 13
p. 108754

Abstract

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Summary: Viral genetic tools that target specific brain cell types could transform basic neuroscience and targeted gene therapy. Here, we use comparative open chromatin analysis to identify thousands of human-neocortical-subclass-specific putative enhancers from across the genome to control gene expression in adeno-associated virus (AAV) vectors. The cellular specificity of reporter expression from enhancer-AAVs is established by molecular profiling after systemic AAV delivery in mouse. Over 30% of enhancer-AAVs produce specific expression in the targeted subclass, including both excitatory and inhibitory subclasses. We present a collection of Parvalbumin (PVALB) enhancer-AAVs that show highly enriched expression not only in cortical PVALB cells but also in some subcortical PVALB populations. Five vectors maintain PVALB-enriched expression in primate neocortex. These results demonstrate how genome-wide open chromatin data mining and cross-species AAV validation can be used to create the next generation of non-species-restricted viral genetic tools.

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