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Selective Enhancer Dependencies in MYC -Intact and MYC -Rearranged Germinal Center B-cell Diffuse Large B-cell
Biorxiv : the Preprint Server for Biology
|May 19, 2023
Summary
High MYC expression drives aggressive B-cell lymphoma. Researchers identified a novel MYC enhancer (GCBME-1) crucial for MYC activation in lymphomas without MYC rearrangements, revealing new therapeutic targets.
Area of Science:
- Genetics and Genomics
- Cancer Biology
- Molecular Oncology
Background:
- High MYC expression defines a poor-prognosis subset of germinal center B-cell diffuse large B-cell lymphoma (GCB-DLBCL).
- MYC activation occurs through chromosomal rearrangements or deletions of the adjacent PVT1 gene.
- Understanding the genomic drivers of MYC activation is critical for developing targeted therapies.
Approach:
- Utilized high-throughput CRISPR-interference (CRISPRi) profiling to assess candidate enhancers in the MYC locus and rearrangement partner loci.
- Compared GCB-DLBCL cell lines with mantle cell lymphoma (MCL) comparators lacking common MYC rearrangements.
- Investigated enhancer dependencies associated with MYC rearrangements and MYC-intact GCB-DLBCL.
Key Points:
- Non-immunoglobulin (non-Ig) MYC rearrangements confer unique dependencies on specific enhancer subunits within partner loci.
- Recurrent MYC::BCL6-super-enhancer (SE) rearrangements show dependency on BCL6-SE cluster enhancers regulated by MEF2B, POU2F2, and POU2AF1.
- MYC-intact GCB-DLBCL exhibits high dependency on a novel 3' enhancer within the MYC locus (GCBME-1), also regulated by the same transcription factor triad.
Conclusions:
- GCBME-1 is an evolutionarily conserved enhancer active in normal germinal center B cells, suggesting a role in normal B-cell biology.
- The PVT1 promoter normally limits MYC activation, a limitation bypassed by 3' rearrangements that delete PVT1.
- CRISPRi screens identified GCBME-1 as essential for GCB-DLBCL lacking MYC rearrangements, highlighting its potential as a therapeutic target.
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