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The molecular understanding of super-enhancer dysregulation in cancer
Seiko Yoshino1, Hiroshi I Suzuki1,2
1Division of Molecular Oncology, Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine, Nagoya, Japan.
Abstract:
Abnormalities in the regulation of gene expression are associated with various pathological conditions. Among the distal regulatory elements in the genome, the activation of target genes by enhancers plays a central role in the formation of cell type-specific gene expression patterns. Super-enhancers are a subclass of enhancers that frequently contain multiple enhancer-like elements and are characterized by dense binding of master transcription factors and Mediator complexes and high signals of active histone marks. Super-enhancers have been studied in detail as important regulatory regions that control cell identity and contribute to the pathogenesis of diverse diseases. In cancer, super-enhancers have multifaceted roles by activating various oncogenes and other cancer-related genes and shaping characteristic gene expression patterns in cancer cells. Alterations in super-enhancer activities in cancer involve multiple mechanisms, including the dysregulation of transcription factors and the super-enhancer-associated genomic abnormalities. The study of super-enhancers could contribute to the identification of effective biomarkers and the development of cancer therapeutics targeting transcriptional addiction. In this review, we summarize the roles of super-enhancers in cancer biology, with a particular focus on hematopoietic malignancies, in which multiple super-enhancer alteration mechanisms have been reported.
Insights
Super-enhancers are key gene regulators involved in cell identity and disease. This review highlights their crucial roles in cancer, particularly in hematopoietic malignancies, and their potential as therapeutic targets.
Area of Science:
- Genomics and Molecular Biology
- Cancer Biology and Genetics
Background:
- Gene expression regulation is critical for cellular function and implicated in disease.
- Enhancers, particularly super-enhancers, are vital distal regulatory elements controlling cell-type-specific gene expression.
- Super-enhancers are characterized by dense transcription factor binding, Mediator complex association, and active histone marks.
Purpose of the Study:
- To review the multifaceted roles of super-enhancers in cancer biology.
- To focus on the mechanisms of super-enhancer alterations in cancer, especially hematopoietic malignancies.
- To explore the potential of super-enhancers as biomarkers and therapeutic targets in cancer.
Main Methods:
- Literature review synthesizing current knowledge on super-enhancers in cancer.
- Analysis of mechanisms involving transcription factor dysregulation and genomic abnormalities.
- Focus on findings related to hematopoietic malignancies.
Main Results:
- Super-enhancers play significant roles in cancer by activating oncogenes and shaping cancer cell gene expression.
- Alterations in super-enhancer activity in cancer occur through various mechanisms, including transcription factor dysregulation.
- Hematopoietic malignancies exhibit diverse reported mechanisms of super-enhancer alteration.
Conclusions:
- Super-enhancers are critical regulators in cancer, influencing oncogene activation and cancer cell identity.
- Understanding super-enhancer alterations offers opportunities for identifying cancer biomarkers.
- Targeting super-enhancers presents a promising strategy for developing novel cancer therapeutics, particularly for transcriptional addiction.
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