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Deregulation of Retroelements as an Emerging Therapeutic Opportunity in Cancer
Charles A Ishak1, Marie Classon2, Daniel D De Carvalho3
1Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2M9, Canada.
Abstract:
Nearly half of the human genome is comprised of repetitive elements that are tightly regulated to protect the host genome from deleterious consequences associated with their inappropriate activation. Cancer cells often misexpress these elements, in part, due to decreases in DNA methylation. Recent discoveries suggest that tumor suppressor proteins contribute to repression of repetitive elements, and their functional inactivation promotes repeat element misexpression during carcinogenesis. Recent findings also suggest that increased expression of repetitive elements beyond a threshold of tolerance can augment cancer therapy responses. Such advances, reviewed here, paint a picture in which deregulated expression of repetitive genome elements not only contributes to the development of cancer but may also provide a tumor-specific Achilles heel for cancer treatment.
Insights
Repetitive elements in the human genome are normally silenced but become active in cancer, potentially offering a new target for cancer therapies. Understanding this mechanism could lead to novel treatment strategies.
Area of Science:
- Genomics
- Cancer Biology
- Epigenetics
Background:
- Repetitive elements constitute nearly half of the human genome and are crucial for genome stability.
- Their aberrant activation in cancer is linked to decreased DNA methylation and inactivation of tumor suppressor proteins.
Purpose of the Study:
- To review the role of repetitive element dysregulation in cancer development.
- To explore the potential of targeting these elements for cancer therapy.
Main Methods:
- Literature review of recent discoveries in genomics, epigenetics, and cancer biology.
- Analysis of the interplay between repetitive elements, DNA methylation, and tumor suppressor proteins.
Main Results:
- Inappropriate activation of repetitive elements is a hallmark of cancer, driven by epigenetic alterations.
- Elevated expression of repetitive elements can enhance responses to cancer therapies.
Conclusions:
- Deregulation of repetitive elements contributes to oncogenesis.
- Targeting misexpressed repetitive elements represents a potential therapeutic vulnerability in cancer.
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