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Men with metastatic prostate cancer who are treated with androgen deprivation therapies (ADT) usually relapse within 2 to 3 years with disease that is termed castration-resistant prostate cancer (CRPC). To identify the mechanism that drives these advanced tumors, paired-end RNA-sequencing (RNA-seq) was performed on a panel of CRPC bone marrow biopsy specimens. From this genome-wide approach, mutations were found in a series of genes with prostate cancer relevance, including AR, NCOR1, KDM3A, KDM4A, CHD1, SETD5, SETD7, INPP4B, RASGRP3, RASA1, TP53BP1, and CDH1, and a novel SND1:BRAF gene fusion. Among the most highly expressed transcripts were 10 noncoding RNAs (ncRNAs), including MALAT1 and PABPC1, which are involved in RNA processing. Notably, a high percentage of sequence reads mapped to introns, which were determined to be the result of incomplete splicing at canonical splice junctions. Using quantitative PCR (qPCR), a series of genes (AR, KLK2, KLK3, STEAP2, CPSF6, and CDK19) were confirmed to have a greater proportion of unspliced RNA in CRPC specimens than in normal prostate epithelium, untreated primary prostate cancer, and cultured prostate cancer cells. This inefficient coupling of transcription and mRNA splicing suggests an overall increase in transcription or defect in splicing.

Whole Transcriptome Sequencing Reveals Extensive Unspliced mRNA in Metastatic Castration-Resistant Prostate Cancer