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The epigenetics of early lymphocyte development.

¹Department of Molecular Biology, University of California, San Diego, La Jolla, California 92093 murre@biomail.ucsd.edu.

Cold Spring Harbor Symposia on Quantitative Biology

|October 5, 2013

Summary

Mammalian genome organization involves chromosomes folding into compartments. Key regulatory genes relocate within the nucleus, changing their 3D structure to influence cell fate during development.

Area of Science:

Genomics
Epigenetics
Cell Biology

Background:

The mammalian genome exhibits complex spatial and functional organization.
Chromosomes fold into distinct territories and compartments (euchromatic and heterochromatic).
These compartments are characterized by specific epigenetic marks associated with gene activity.

Purpose of the Study:

To describe how genetic loci encoding key regulators change nuclear neighborhoods.
To explain the reorganization of 3D genome structures.
To understand how these changes drive cell fate decisions.

Main Methods:

Analysis of genome spatial organization.
Investigation of chromatin folding dynamics.
Study of epigenetic modifications.

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Role of lineage-specific transcription factors.

Main Results:

Gene segments move between euchromatic and heterochromatic compartments during lymphocyte development.
Genes with altered transcriptional activity show significant changes in chromatin folding.
Lineage-specific transcription factors mediate these genomic reconfigurations.
Genetic loci encoding key regulators switch nuclear neighborhoods.

Conclusions:

Nuclear positioning and 3D genome structure are dynamic.
Dynamic changes in genome organization are crucial for cell fate.
Transcription factors play a key role in mediating these structural changes.