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Temporal inhibition of chromatin looping and enhancer accessibility during neuronal remodeling

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  • Dahong Chen

    (Nuclear Organization and Gene Expression Section
    Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health)

  • Catherine E. McManus

    (Nuclear Organization and Gene Expression Section
    Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health)

  • Behram Radmanesh

    (Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health)

  • Leah H. Matzat

    (Nuclear Organization and Gene Expression Section
    Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health)

  • Elissa P. Lei

    (Nuclear Organization and Gene Expression Section
    Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health)

Abstract

During development, looping of an enhancer to a promoter is frequently observed in conjunction with temporal and tissue-specific transcriptional activation. The chromatin insulator-associated protein Alan Shepard (Shep) promotes Drosophila post-mitotic neuronal remodeling by repressing transcription of master developmental regulators, such as brain tumor (brat), specifically in maturing neurons. Since insulator proteins can promote looping, we hypothesized that Shep antagonizes brat promoter interaction with an as yet unidentified enhancer. Using chromatin conformation capture and reporter assays, we identified two enhancer regions that increase in looping frequency with the brat promoter specifically in pupal brains after Shep depletion. The brat promoters and enhancers function independently of Shep, ruling out direct repression of these elements. Moreover, ATAC-seq in isolated neurons demonstrates that Shep restricts chromatin accessibility of a key brat enhancer as well as other enhancers genome-wide in remodeling pupal but not larval neurons. These enhancers are enriched for chromatin targets of Shep and are located at Shep-inhibited genes, suggesting direct Shep inhibition of enhancer accessibility and gene expression during neuronal remodeling. Our results provide evidence for temporal regulation of chromatin looping and enhancer accessibility during neuronal maturation.

Suggested Citation

  • Dahong Chen & Catherine E. McManus & Behram Radmanesh & Leah H. Matzat & Elissa P. Lei, 2021. "Temporal inhibition of chromatin looping and enhancer accessibility during neuronal remodeling," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26628-7
    DOI: 10.1038/s41467-021-26628-7
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    References listed on IDEAS

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    1. Yad Ghavi-Helm & Felix A. Klein & Tibor Pakozdi & Lucia Ciglar & Daan Noordermeer & Wolfgang Huber & Eileen E. M. Furlong, 2014. "Enhancer loops appear stable during development and are associated with paused polymerase," Nature, Nature, vol. 512(7512), pages 96-100, August.
    2. Susan E. Celniker & Laura A. L. Dillon & Mark B. Gerstein & Kristin C. Gunsalus & Steven Henikoff & Gary H. Karpen & Manolis Kellis & Eric C. Lai & Jason D. Lieb & David M. MacAlpine & Gos Micklem & F, 2009. "Unlocking the secrets of the genome," Nature, Nature, vol. 459(7249), pages 927-930, June.
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    1. Xingting Guo & Chenhui Wang & Yongchao Zhang & Ruxue Wei & Rongwen Xi, 2024. "Cell-fate conversion of intestinal cells in adult Drosophila midgut by depleting a single transcription factor," Nature Communications, Nature, vol. 15(1), pages 1-16, December.

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