Comprehensive In Vivo Interrogation Reveals Phenotypic Impact of Human Enhancer Variants

Evgeny Z. Kvon, Yiwen Zhu, Guy Kelman, Catherine S. Novak, Ingrid Plajzer-Frick, Momoe Kato, Tyler H. Garvin, Quan Pham, Anne N. Harrington, Riana D. Hunter, Janeth Godoy, Eman M. Meky, Jennifer A. Akiyama, Veena Afzal, Stella Tran, Fabienne Escande, Brigitte Gilbert-Dussardier, Nolwenn Jean-Marçais, Sanjarbek Hudaiberdiev, Ivan OvcharenkoMatthew B. Dobbs, Christina A. Gurnett, Sylvie Manouvrier-Hanu, Florence Petit, Axel Visel, Diane E. Dickel, Len A. Pennacchio

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Establishing causal links between non-coding variants and human phenotypes is an increasing challenge. Here, we introduce a high-throughput mouse reporter assay for assessing the pathogenic potential of human enhancer variants in vivo and examine nearly a thousand variants in an enhancer repeatedly linked to polydactyly. We show that 71% of all rare non-coding variants previously proposed as causal lead to reporter gene expression in a pattern consistent with their pathogenic role. Variants observed to alter enhancer activity were further confirmed to cause polydactyly in knockin mice. We also used combinatorial and single-nucleotide mutagenesis to evaluate the in vivo impact of mutations affecting all positions of the enhancer and identified additional functional substitutions, including potentially pathogenic variants hitherto not observed in humans. Our results uncover the functional consequences of hundreds of mutations in a phenotype-associated enhancer and establish a widely applicable strategy for systematic in vivo evaluation of human enhancer variants. Development of a scalable in vivo mouse enhancer-reporter assay and its use to systematically interrogate the canonical human ZRS enhancer, which drives Sonic hedgehog expression in mammalian limb development, broadly illuminates enhancer variant pathogenicity.

Original languageEnglish
Pages (from-to)1262-1271.e15
JournalCell
Volume180
Issue number6
DOIs
StatePublished - Mar 19 2020

Keywords

  • CRISPR/Cas9
  • Sonic hedgehog
  • ZRS
  • cis-regulatory element
  • enhancer
  • genome editing
  • limb development
  • mutation
  • polydactyly
  • rare non-coding variant

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