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Related Concept Videos

Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
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Related Experiment Video

Updated: Jul 4, 2026

Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
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Implementing the LIM code: the structural basis for cell type-specific assembly of LIM-homeodomain complexes.

Mugdha Bhati1, Christopher Lee, Amy L Nancarrow

  • 1School of Molecular and Microbial Biosciences, The University of Sydney, New South Wales, Australia.

The EMBO Journal
|June 28, 2008
PubMed
Summary

The islet-1 (Isl1) protein forms motor neurons by binding LIM homeobox protein 3 (Lhx3), displacing LIM domain-binding protein 1 (Ldb1). This molecular switch reveals how diverse protein interactions specify cell types.

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Area of Science:

  • Developmental biology
  • Molecular biology
  • Structural biology

Background:

  • LIM-homeodomain (LIM-HD) transcription factors establish cell identity through combinatorial interactions.
  • In the ventral spinal cord, the LIM homeobox protein 3 (Lhx3)/LIM domain-binding protein 1 (Ldb1) complex specifies V2 interneurons.

Purpose of the Study:

  • To elucidate the molecular mechanism underlying the switch from V2 interneuron to motor neuron specification.
  • To identify and structurally characterize the Lhx3-binding domain of islet-1 (Isl1).

Main Methods:

  • X-ray crystallography
  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Protein-protein interaction analysis

Main Results:

  • Identified the 30-residue Lhx3-binding domain on Isl1 (Isl1(LBD)).
  • Structural analysis revealed that Isl1(LBD) binds Lhx3 identically to the LIM interaction domain of Ldb1 (Ldb1(LID)).
  • Demonstrated that Isl1(LBD) mimics Ldb1(LID) in its interaction with Lhx3.

Conclusions:

  • Provides a structural basis for how alternative protein complexes form through competitive binding of linear motifs.
  • Explains the molecular switch enabling cell type-specific gene regulation in neural development.
  • Highlights the role of sequence-diverse motifs in mediating specific protein-protein interactions.