326 Integrated Analysis of Genetic Databases Identifies miRNA Associated With Poor Survival In Melanoma

Abstract

OBJECTIVES/GOALS: Despite advances in precision medicine and understanding of the molecular pathways, melanoma remains the deadliest skin cancer, warranting identification of novel biomarkers. In this study, we performed bioinformatic analysis of melanoma patient tumors to identify novel dysregulated gene and micro-RNA (miRNA) targets responsible for survival. METHODS/STUDY POPULATION: Genetic sequencing data for 594 patient samples of melanoma and normal skin tissue from 10 databases were accessed using the NCBI Gene Expression Omnibus. Genes and miRNA that were significantly dysregulated (adjusted p-value < 0.05, log fold change > ± 2) in melanoma compared to normal skin were identified using the GEO2R program. Dataset expression profiles were cross-referenced to identify genetic elements dysregulated in at least 50% of datasets and filtered for association with poor survival using R2 Genomics Analysis and Visualization Platform. DAVID 6.8 provided pathway analysis of dysregulated genes. miRTarBase linked genes associated with poor survival and dysregulated miRNA from our database analysis. RESULTS/ANTICIPATED RESULTS: Bioinformatic analysis revealed consistent differential regulation of 205 genes (down=177 and up=28) and 38 miRNA across datasets with fold change >2 (bonf. p<0.05). Pathway analysis indicated that PPAR, phosphatidylinositol signaling, Rap1 signaling, and p53 signaling pathways were enriched by downregulated genes while the NF-kB pathway was enriched up regulated genes. Survival analysis of the differentially regulated genes identified 11 downregulated (ACSL1, CEBPA, CES4A, CRIP1, GATA3, HLADQB2, PTGS1, PYCARD, PPARG, PKP3, RSSF6) and 3 upregulated (DUXAP10, SLC2A3 and PRAME) hub genes to be associated with poor overall survival. Out of the 13 miRNA associated with hub genes, five miRNA (hsa-miR-125b-5p, hsa-miR-130b-3p, hsa-miR-26n-5p, hsa-miR-30b, hsa-miR-30c) were linked to multiple hub genes. DISCUSSION/SIGNIFICANCE: Our analysis identified 14 hub genes (regulators of PPARA, adipocyte differentiation, and transcriptional pathways) as well as miRNAs hsa-miR-30c (regulator of PTGS1 and SLC2A3) and hsa-let-7i-5p (regulator of ASCL1) as potential therapeutic targets. Further studies for validation of the targets are needed for clinical translation in melanoma.