Epigenetic drivers of genetic alterations

Area of Science:

• Molecular Biology
• Cancer Genetics
• Epigenetics

Background:

• DNA methylation is crucial for gene silencing in cancer, impacting cell cycle, apoptosis, and angiogenesis.
• Epigenetic alterations contribute to genetic instability, including microsatellite and chromosomal changes.
• Both regional hypermethylation and global hypomethylation are common in tumors.

Purpose of the Study:

• To discuss how epigenetic changes lead to genetic alterations in cancer.
• To highlight the role of epigenetic inactivation of specific genes in cancer development.
• To explore the implications of epigenetic alterations for cancer treatment.

Main Methods:

• Review of literature on DNA methylation and its role in cancer.
• Analysis of epigenetic mechanisms leading to genetic instability.
• Discussion of specific gene examples (hMLH1, MGMT, BRCA1) and their epigenetic inactivation.

Main Results:

• Epigenetic inactivation of hMLH1 causes microsatellite instability in colorectal cancers.
• Epigenetic inactivation of MGMT correlates with specific mutations (K-ras, p53).
• Epigenetic alterations in genes like BRCA1, WRN, FANCF, and CHFR impair DNA repair and genomic integrity.

Conclusions:

• Epigenetic alterations are significant drivers of genetic instability in cancer.
• Understanding these epigenetic drivers is vital for novel cancer therapeutic strategies.
• Targeting epigenetic modifications may offer new avenues for cancer treatment.