AUTHOR=Jayarathna Dulari K. , Rentería Miguel E. , Malik Adil , Sauret Emilie , Batra Jyotsna , Gandhi Neha S. 

TITLE=Integrative Transcriptome-Wide Analyses Uncover Novel Risk-Associated MicroRNAs in Hormone-Dependent Cancers

JOURNAL=Frontiers in Genetics

VOLUME=12

YEAR=2021

URL=https://www.frontiersin.org/journals/genetics/articles/10.3389/fgene.2021.716236

DOI=10.3389/fgene.2021.716236

ISSN=1664-8021

ABSTRACT=<sec><title>Background</title><p>Hormone-dependent cancers (HDC) are among the leading causes of death worldwide among both men and women. Some of the established risk factors of HDC include unhealthy lifestyles, environmental factors, and genetic influences. Numerous studies have been conducted to understand gene–cancer associations. Transcriptome-wide association studies (TWAS) integrate data from genome-wide association studies (GWAS) and gene expression (expression quantitative trait loci – eQTL) to yield meaningful information on biological pathways associated with complex traits/diseases. Recently, TWAS have enabled the identification of novel associations between HDC risk and protein-coding genes.</p></sec><sec><title>Methods</title><p>In the present study, we performed a TWAS analysis using the summary data-based Mendelian randomization (SMR)–heterogeneity in dependent instruments (HEIDI) method to identify microRNAs (miRNAs), a group of non-coding RNAs (ncRNAs) associated with HDC risk. We obtained eQTL and GWAS summary statistics from the ncRNA-eQTL database and the National Human Genome Research Institute–European Bioinformatics Institute (NHGRI-EBI) GWAS Catalog.</p></sec><sec><title>Results</title><p>We identified 13 TWAS-significant miRNAs at <italic>cis</italic> regions (±1 Mb) associated with HDC risk (two, five, one, two, and three miRNAs for prostate, breast, ovarian, colorectal, and endometrial cancers, respectively). Among them, eight novel miRNAs were recognized in HDC risk. Eight protein-coding genes targeted by TWAS-identified miRNAs (<italic>SIRT1</italic>, <italic>SOX4</italic>, <italic>RUNX2</italic>, <italic>FOXA1</italic>, <italic>ABL2</italic>, <italic>SUB1</italic>, <italic>HNRNPH1</italic>, and <italic>WAC</italic>) are associated with HDC functions and signaling pathways.</p></sec><sec><title>Conclusion</title><p>Overall, identifying risk-associated miRNAs across a group of related cancers may help to understand cancer biology and provide novel insights into cancer genetic mechanisms. This customized approach can be applied to identify significant miRNAs in any trait/disease of interest.</p></sec>