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Cell-specific alterations in Pitx1 regulatory landscape activation caused by the loss of a single enhancer

Author

Listed:
  • Raquel Rouco

    (University of Geneva
    University of Geneva)

  • Olimpia Bompadre

    (University of Geneva
    University of Geneva)

  • Antonella Rauseo

    (University of Geneva
    University of Geneva)

  • Olivier Fazio

    (University of Geneva)

  • Rodrigue Peraldi

    (University of Geneva
    University of Geneva
    Genetics and Development Research Unit, Institut de Recherches Cliniques de Montréal)

  • Fabrizio Thorel

    (University of Geneva)

  • Guillaume Andrey

    (University of Geneva
    University of Geneva)

Abstract

Developmental genes are frequently controlled by multiple enhancers sharing similar specificities. As a result, deletions of such regulatory elements have often failed to reveal their full function. Here, we use the Pitx1 testbed locus to characterize in detail the regulatory and cellular identity alterations following the deletion of one of its enhancers (Pen). By combining single cell transcriptomics and an in-embryo cell tracing approach, we observe an increased fraction of Pitx1 non/low-expressing cells and a decreased fraction of Pitx1 high-expressing cells. We find that the over-representation of Pitx1 non/low-expressing cells originates from a failure of the Pitx1 locus to coordinate enhancer activities and 3D chromatin changes. This locus mis-activation induces a localized heterochrony and a concurrent loss of irregular connective tissue, eventually leading to a clubfoot phenotype. This data suggests that, in some cases, redundant enhancers may be used to locally enforce a robust activation of their host regulatory landscapes.

Suggested Citation

  • Raquel Rouco & Olimpia Bompadre & Antonella Rauseo & Olivier Fazio & Rodrigue Peraldi & Fabrizio Thorel & Guillaume Andrey, 2021. "Cell-specific alterations in Pitx1 regulatory landscape activation caused by the loss of a single enhancer," Nature Communications, Nature, vol. 12(1), pages 1-15, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-27492-1
    DOI: 10.1038/s41467-021-27492-1
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    1. Christopher Chase Bolt & Lucille Lopez-Delisle & Aurélie Hintermann & Bénédicte Mascrez & Antonella Rauseo & Guillaume Andrey & Denis Duboule, 2022. "Context-dependent enhancer function revealed by targeted inter-TAD relocation," Nature Communications, Nature, vol. 13(1), pages 1-15, December.
    2. Fabrice Darbellay & Anna Ramisch & Lucille Lopez-Delisle & Michael Kosicki & Antonella Rauseo & Zahra Jouini & Axel Visel & Guillaume Andrey, 2024. "Pre-hypertrophic chondrogenic enhancer landscape of limb and axial skeleton development," Nature Communications, Nature, vol. 15(1), pages 1-15, December.

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