Abstract
Beta-microseminoprotein (MSP)/MSMB is an immunoglobulin superfamily protein synthesized by prostate epithelial cells and secreted into seminal plasma. Variants in the promoter of the MSMB gene have been associated with the risk of prostate cancer (PCa) in several independent genome-wide association studies. Both MSMB and an adjacent gene, NCOA4, are subjected to transcriptional control via androgen response elements. The gene product of NCOA4 interacts directly with the androgen receptor as a co-activator to enhance AR transcriptional activity. Here, we provide evidence for the expression of full-length MSMB-NCOA4 fusion transcripts regulated by the MSMB promoter. The predominant MSMB-NCOA4 transcript arises by fusion of the 5′UTR and exons 1–2 of the MSMB pre-mRNA, with exons 2–10 of the NCOA4 pre-mRNA, producing a stable fusion protein, comprising the essential domains of NCOA4. Analysis of the splice sites of this transcript shows an unusually strong splice acceptor at NCOA4 exon 2 and the presence of Alu repeats flanking the exons potentially involved in the splicing event. Transfection experiments using deletion clones of the promoter coupled with luciferase reporter assays define a core MSMB promoter element located between −27 and −236 of the gene, and a negative regulatory element immediately upstream of the start codon. Computational network analysis reveals that the MSMB gene is functionally connected to NCOA4 and the androgen receptor signaling pathway. The data provide an example of how GWAS-associated variants may have multiple genetic and epigenetic effects.
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Abbreviations
- ARE:
-
Androgen response element
- AR:
-
Androgen receptor
- GWAS:
-
Genome-wide association studies
- PCa:
-
Prostate cancer
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Acknowledgments
The authors would like to thank Allison Bierly and Wei Tan for critical reading of the manuscript and helpful comments. The project was supported in part by the Intramural Research Program of the National Institutes of Health, National Cancer Institute, Center for Cancer Research, and from SAIC-Frederick under contract #NO1-CO-12400. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. The content of this publication does not necessarily reflect the views or policies of the Department of Health and Human Services, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.
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H. Lou and H. Li contributed equally to this work.
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Figure S1. Representation of the junction sites of the MSMB-NCOA4 transcripts. The MSMB-NCOA4 fusions are colored, numbered and arrowed from the original reference sequences. Line graphs show the position and cDNA sequence of the fusion points. Bottom-left panel shows the sequencing result of the 5′ RACE assay for MSMB-NCOA4 1 fusion transcript, including MSMB exon 1, MSMB exon 2, partial of NCOA4 exon 2 and 5′RACE primer sites.
Figure S2. Comparison of several concensus published androgen response elements (ARE) sequences and the four MSMB-NCO4 region ARE-like motifs.
Figure S3. BiblioSphere Pathway view network of the MSMB gene co-citated with the NCOA4 gene. A network of 21 genes was identified by analysis of MSMB-related genes with the BiblioSpherePathwayEdition software package based on co-citations with transcription factors, functional co-citations, and co-citations with other genes in the network. The nodes represent the genes. The BLACK edges indicate co-citation of two genes in the PubMed database; the GREEN edges indicate the presence of a significant TFBS on the promoter of the given gene for the specific interacting transcription factor.
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Lou, H., Li, H., Yeager, M. et al. Promoter variants in the MSMB gene associated with prostate cancer regulate MSMB/NCOA4 fusion transcripts. Hum Genet 131, 1453–1466 (2012). https://doi.org/10.1007/s00439-012-1182-2
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DOI: https://doi.org/10.1007/s00439-012-1182-2