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Updated: Jan 30, 2026
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Generation of RNA/DNA Hybrids in Genomic DNA by Transformation using RNA-containing Oligonucleotides
Published on: November 24, 2010
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Changes in long-range rDNA-genomic interactions associate with altered RNA polymerase II gene programs during
Jeannine Diesch1,2, Megan J Bywater1,3, Elaine Sanij1,4
11Cancer Research Division, Peter MacCallum Cancer Centre, Melbourne, VIC 3000 Australia.
Communications Biology
|February 1, 2019
Summary
Cancer cells hijack ribosomal RNA genes (rDNA) by converting their chromatin to an open state, which is essential for tumor survival and growth. This process involves dynamic genome reorganization and impacts key cellular pathways.
Area of Science:
- Genomics
- Cancer Biology
- Epigenetics
Background:
- The 3D genome organization is crucial for genome regulation and maintenance.
- Interactions between chromosomal regions and nucleolar ribosomal RNA genes (rDNA) are known, but their biological significance and regulation during disease are unclear.
- Ribosomal RNA gene (rDNA) chromatin exists in active and inactive states, regulated by the RNA polymerase I transcription factor UBTF.
Purpose of the Study:
- To investigate the role of rDNA chromatin states and rDNA-genome interactions in cancer progression.
- To determine if rDNA-genome interactions are dynamically regulated during disease.
- To elucidate the function of UBTF in regulating rDNA chromatin during malignant transformation.
Main Methods:
- Utilized a MYC-driven lymphoma model.
- Analyzed changes in rDNA chromatin states during malignant progression.
- Examined reorganization of rDNA-genome contacts.
- Correlated rDNA changes with gene expression profiles.
Main Results:
- During malignant progression, rDNA chromatin converts to an open state, crucial for tumor cell survival.
- This rDNA chromatin transition is associated with reorganized rDNA-genome contacts.
- Reorganized contacts correlate with altered gene expression in loci interacting with rDNA, affecting B-cell differentiation, cell growth, and metabolism.
Conclusions:
- UBTF-mediated conversion to open rDNA chromatin during malignant transformation regulates specific gene pathways.
- Reformed long-range physical interactions with rDNA contribute to the regulation of growth and differentiation pathways.
- Dynamic regulation of rDNA-genome interactions plays a significant role in cancer progression.
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