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Nipbl and mediator cooperatively regulate gene expression to control limb development.

Akihiko Muto1, Shingo Ikeda2, Martha E Lopez-Burks3

  • 1Department of Developmental & Cell Biology, University of California, Irvine, Irvine, California, United States of America; Center for Complex Biological Systems, University of California, Irvine, Irvine California; Department of Biological Science, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan.

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This summary is machine-generated.

Nipbl deficiency causes Cornelia de Lange Syndrome (CdLS) and limb defects by disrupting long-range DNA interactions. This study shows Nipbl, with Mediator, regulates gene expression crucial for limb development.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Cornelia de Lange Syndrome (CdLS) is a developmental disorder caused by haploinsufficiency of Nipbl, a cohesin loading protein.
  • Nipbl deficiency is linked to disrupted long-range DNA element communication, impacting gene expression.
  • Limb defects are a common manifestation of CdLS, but the underlying molecular mechanisms are not fully understood.

Purpose of the Study:

  • To investigate how Nipbl deficiency leads to transcriptional dysregulation and limb defects in zebrafish and mouse models of CdLS.
  • To explore the role of Nipbl in regulating gene expression, particularly Hox genes, during limb development.
  • To examine the interaction between Nipbl and the Mediator complex in controlling long-range chromosomal interactions.

Main Methods:

  • Utilized zebrafish and mouse models with Nipbl deficiency.
  • Performed transcriptome analysis on limb buds to identify gene expression changes.
  • Employed three-dimensional fluorescent in situ hybridization to visualize chromosomal interactions.

Main Results:

  • Nipbl deficiency in zebrafish caused pectoral fin size and patterning defects, with dysregulated expression of key limb development genes.
  • Transcriptome analysis in mice revealed similar gene expression alterations, including dysregulated Hox gene expression dependent on genomic location.
  • Nipbl and Med12 (Mediator subunit) act synergistically and are essential for bringing long-range enhancers close to the zebrafish hoxda cluster.

Conclusions:

  • Nipbl plays a critical role in vertebrate limb development.
  • Nipbl, in conjunction with the Mediator complex, regulates long-range chromosomal interactions to control gene expression pathways essential for limb formation.
  • Disruption of these interactions by Nipbl haploinsufficiency contributes to the limb defects observed in CdLS.