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Updated: Nov 28, 2025
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Published on: July 9, 2015
Exploring role of 5hmC as potential marker of chemoresistance
Suhas S Kharat1, Shyam K Sharan1
1Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, Maryland USA.
Abstract:
Chemoresistance remains to be a common and significant hurdle with all chemotherapies. Tumors gain resistance by acquiring additional mutations. Some of the chemoresistance mechanisms are known and can be tackled. However, the majority of chemoresistance mechanisms are unknown. Our recent findings shed light on one such unknown mechanism. We identified a novel role for 5-hydroxymethycytosine (5hmC), an epigenetic mark on the DNA, in maintaining the integrity of stalled replication forks and its impact on genomic stability and chemoresistance.
Insights
Chemoresistance is a major challenge in cancer therapy. Our study reveals that 5-hydroxymethycytosine (5hmC), an epigenetic mark, plays a crucial role in maintaining genomic stability and overcoming chemoresistance.
Area of Science:
- Epigenetics
- Genomic Stability
- Cancer Biology
Background:
- Chemoresistance is a significant obstacle in cancer treatment.
- Tumor cells develop resistance through genetic mutations.
- Many chemoresistance mechanisms remain poorly understood.
Purpose of the Study:
- To elucidate novel mechanisms underlying chemoresistance.
- To investigate the role of epigenetic modifications in chemoresistance.
- To identify new therapeutic targets for overcoming drug resistance.
Main Methods:
- Analysis of epigenetic marks in resistant cancer cells.
- Investigating the function of 5-hydroxymethycytosine (5hmC) in DNA replication.
- Assessing the impact of 5hmC on genomic stability and chemoresistance.
Main Results:
- Identified a novel role for 5-hydroxymethycytosine (5hmC) in DNA repair.
- Demonstrated that 5hmC is critical for maintaining stalled replication fork integrity.
- Linked 5hmC levels to genomic stability and chemoresistance in tumors.
Conclusions:
- 5-hydroxymethycytosine (5hmC) is a key epigenetic regulator of chemoresistance.
- Targeting 5hmC pathways may offer a strategy to overcome drug resistance.
- Understanding 5hmC's role enhances knowledge of genomic stability and cancer therapy.
