Abstract
A certain proportion of genes are regulated by multiple, distinct promoters, revealing a dynamic landscape of the cancer transcriptome. However, the contribution of alternative promoters (APs) in breast cancer (BRCA) remains largely unexplored. Here, we identified 3654 genes with multiple promoters in BRCA patients, and 53 of them could generate distinct AP transcripts that are dysregulated and prognosis-related in BRCA, namely prognosis-related dysregulated AP (prdeAP) transcripts. Interestingly, when we searched for the genomic signatures of these prdeAP genes, we found that the promoter regions of 92% of the prdeAP genes were enriched with abundant DNA methylation signals. Through further bioinformatic analysis and experimental validation, we showed that AP selections of TANK, UNKL, CCL28, and MAP1LC3A were regulated by DNA methylation upon their corresponding promoter regions. Functionally, by overexpressing AP variants of TANK, we found that TANK|55731 could dramatically suppress MDA-MB-231 cell proliferation and migration. Meanwhile, pan-cancer survival analyses suggested that AP variants of TANK provided more accurate prognostic predictive ability than TANK gene in a variety of tumor types, including BRCA. Together, by uncovering the DNA methylation-regulated AP transcripts with tumor prognostic features, our work revealed a novel layer of regulators in BRCA progression and provided potential targets that served as effective biomarkers for anti-BRCA treatment.
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Data availability
The datasets analyzed during the current study are available in the TCGA SpliceSeq database (https://bioinformatics.mdanderson.org/TCGASpliceSeq/), and UCSC Xena database (http://xena.ucsc.edu/).
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Acknowledgements
The authors thank Dr. Xiaoling Liang from the First Affiliated Hospital, Division of Life Sciences and Medicine, University of Science and Technology of China for her constructive suggestions. The authors also thank Core Facility Center for Life Sciences, USTC for their technical support to this project.
Funding
This work was supported by National Natural Science Foundation of China (32170557, and 31970598 to X.W. and 32300450 to T.S.), University Natural Science Research Project of Anhui Province (2022AH050211 to T.S.), and the 2023 Wuhu Science and Technology Plan Project (2023jc14 to T.S.).
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All authors contributed to the study conception and design. The project was supervised and organized by X.W. and T.S. Material preparation, data collection, and analysis were performed by Y.S. and T.S. The first draft of the manuscript was written by X.W., T.S., and Y.S. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Song, Y., Shen, T., Sun, H. et al. Genome-wide analyses reveal the regulatory roles of DNA methylation-regulated alternative promoter transcripts in breast cancer. Hum. Genet. 143, 385–399 (2024). https://doi.org/10.1007/s00439-024-02653-6
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DOI: https://doi.org/10.1007/s00439-024-02653-6