Cited by 135CRISPR and Genetic EngineeringGenomics and Chromatin DynamicsGene Regulatory Network Analysis

LADL: light-activated dynamic looping for endogenous gene expression control

Open access
Kim, Ji Hun, Rege, Mayuri, Valeri, Jacqueline, Dunagin, Margaret C., Metzger, Aryeh, Titus, Katelyn R., Gilgenast, Thomas G., Gong, Wanfeng +3 more·2019·Nature Methods

Published version of a preprint

Abstract

Mammalian genomes are folded into tens of thousands of long-range looping interactions. The cause-and-effect relationship between looping and genome function is poorly understood, and the extent to which loops are dynamic on short time scales remains an unanswered question. Here, we engineer a new class of synthetic architectural proteins for directed rearrangement of the three-dimensional genome using blue light. We target our light-activated-dynamic-looping (LADL) system to two genomic anchors with CRISPR guide RNAs and induce their spatial colocalization via light-induced heterodimerization of cryptochrome 2 and a dCas9-CIBN fusion protein. We apply LADL to redirect a stretch enhancer (SE) away from its endogenous Klf4 target gene and to the Zfp462 promoter. Using single-molecule RNA-FISH, we demonstrate that de novo formation of the Zfp462-SE loop correlates with a modest increase in Zfp462 expression. LADL facilitates colocalization of genomic loci without exogenous chemical cofactors and will enable future efforts to engineer reversible and oscillatory loops on short time scales.

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  • Chromatin loops enable interactions between enhancers and promoters enabling fine control of gene expression, in addition to regulation mediated by transcription factors and other epigenetic modifications.

    “Chromatin loops enable interactions between enhancers and promoters enabling fine control of gene expression, in addition to the regulation mediated by transcription factors and other epigenetic modifications”

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Authors
Kim, J. H., Rege, M., Valeri, J., Dunagin, M. C., Metzger, A., Titus, K. R., Gilgenast, T. G., Gong, W., Beagan, J. A., Raj, A., & Phillips-Cremins, J. E.
Affiliations
University of Pennsylvania (US)
Venue
Nature Methods
Published
2019-06-24
Volume
16
Issue
7
Pages
633-639
ISSN
  • 1548-7091 (ISSN-L)
  • 1548-7105
OpenAlex
W2949539957
Cited by
135
References
30
Citations by year
2026: 5 · 2025: 14 · 2024: 12 · 2023: 15 · 2022: 23 · 2021: 33 · 2020: 24 · 2019: 9
FWCI
7.37
Type
journal article
Language
en
Open access
Locations
  • Nature Methods (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Science Foundation (1562665)
  • Foundation for the National Institutes of Health
  • Alfred P. Sloan Foundation
  • New York Stem Cell Foundation
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (U01HL129998)
  • National Institute of Mental Health (1DP2MH11024701, DP2MH110247)
  • National Institute of General Medical Sciences
  • Division of Mathematical Sciences
  • Common Fund
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene Regulatory Network Analysis
Keywords
3D genome organization, CRY2, gene expression regulation, single-molecule RNA FISH
MeSH terms
Kruppel-Like Factor 4, RNA, Guide, CRISPR-Cas Systems, Animals, Carrier Proteins, Cells, Cultured, DNA-Binding Proteins, Gene Expression Regulation, Light, Male, Nerve Tissue Proteins, Promoter Regions, Genetic, Protein Engineering, Mice, Kruppel-Like Transcription Factors

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