Epigenetic analysis identifies factors driving racial disparity in prostate cancer. Academic Article uri icon

Overview

abstract

  • BACKGROUND: Prostate cancer (PCa) is the second most leading cause of death in men worldwide. African-American men (AA) represent more aggressive form of the disease compared to Caucasian (CA) counterparts. Several lines of evidences suggest that biological factors are responsible for the observed racial disparity. AIM: This study was aimed at identifying the epigenetic variation among AA and CA PCa patients and whether DNA methylation differences have an association with clinical outcomes in the two races. METHODS AND RESULTS: The cancer genome atlas (TCGA) dataset (2015) was used to identify existing epigenetic variation in AA and CA PCa patients. Reduced Representation Bisulfite Sequencing (RRBS) was performed to identify global DNA methylation changes in a small cohort of AA and CA PCa patients. The RRBS data were then used to identify survival and recurrence outcomes in AA and CA PCa patients using publicly available datasets. The TCGA data analysis revealed epigenetic heterogeneity, which could be categorized into four classes. AA associated primarily to methylation cluster 1 (p = 0.048), and CA associated to methylation cluster 3 (p = 0.000146). Enrichment of the Wnt signaling pathway was identified in both the races; however, they were differentially activated in terms of canonical and non-canonical Wnt signaling. This was further validated using the Decipher Genomics Resource Information Database (GRID). The RRBS data also identified discrete methylation patterns in AA compared with CA and, in part, validated our TCGA findings. Survival analysis using the RRBS data suggested hypomethylated genes to be significantly associated with recurrence of PCa in CA (p = 6.07 × 10-6) as well as in AA (p = 0.0077). CONCLUSION: Overall, we observed epigenetic-based racial disparity in PCa which could affect survival and should be considered during prognosis and treatment.

publication date

  • December 13, 2018

Research

keywords

  • Black People
  • DNA Methylation
  • Prostatic Neoplasms
  • White People

Identity

PubMed Central ID

  • PMC7941489

Scopus Document Identifier

  • 85085531526

Digital Object Identifier (DOI)

  • 10.7908/C1QF8SB3

PubMed ID

  • 32721098

Additional Document Info

volume

  • 2

issue

  • 2