Breast cancer is the most common cancer among women, and the second leading cause of cancer mortality in females in the U.S., with 300,000 new diagnoses and 41,000 fatalities annually. Recently, the dysfunction of a new class of gene expression regulators, named microRNAs (miRNAs), was linked to breast cancer initiation, progression and metastasis. miRNAs are short non-coding RNAs that bind to complementary sequences in the 3'UnTranslated Regions (3'UTRs) in the cytoplasm and repress gene expression. Based on bioinformatic analysis each miRNA is predicted to control a network of gene products, such that hundreds of transcripts are likely to be regulated by a single miRNA. The pairing with target 3'UTRs does not require a perfect match between the sequences. Since these elements are degenerate and small, they are generally difficult to detect, thus the vast majority of cancer relevant miRNA targets are still unknown. To overcome these gaps in our knowledge, we have developed an unbiased high-throughput screening method named 3'LIFE assay (Luminescence-based Identification of Functional Elements in 3'UTRs). 3'LIFE systematically maps miRNA targets in 3'UTRs with an unprecedented scale, allowing us to study the dynamics of genetic networks triggered by miRNAs during the initiation and the progression of breast cancer. We will use the 3'LIFE assay to detect miRNA targets in a pilot library composed of 1,880 3'UTRs, and probe two breast cancer relevant miRNAs: let-7c and miR-10b. We will map their network of interaction and will use their binding requirements in order to extend the targets to the entire human transcriptome. We will then validate the targets in vivo and compare our results to the transcriptome and miRNA changes in matched normal and early stage breast cancer biopsies using the human mammary conditionally reprogrammed cell (HMCRC) system. Our approach 1) pioneers an innovative method to detect miRNA:3'UTR interactions, 2) will detect the genetic network controlled by two breast cancer-relevant miRNAs, 3) will pinpoint tumor-specific miRNA and transcriptome changes of early stage primary breast cancers, and 4) will discover biomarkers and potential drug targets for early breast cancer detection and screening.

Public Health Relevance

Micro RNAs (miRNAs) are small non-coding genes that target functional elements in the messages of other genes regulating their expression into proteins, and their dysfunction has been observed in a numerous human diseases, including breast cancer. We do not have a standardized method to systematically find these functional elements in a cost-effective and high-throughput fashion. Our approach overcomes this limitation allowing the detection and the validation of hundreds of miRNA targets in days, significantly enhancing our knowledge of the biology of these important gene regulators and their impact in breast cancer initiation and progression.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Exploratory/Developmental Grants (R21)
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Cancer Molecular Pathobiology Study Section (CAMP)
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Li, Jerry
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Arizona State University-Tempe Campus
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United States
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Wolter, Justin M; Le, Hoai Huang Thi; Linse, Alexander et al. (2017) Evolutionary patterns of metazoan microRNAs reveal targeting principles in the let-7 and miR-10 families. Genome Res 27:53-63
Blazie, Stephen M; Geissel, Heather C; Wilky, Henry et al. (2017) Alternative Polyadenylation Directs Tissue-Specific miRNA Targeting in Caenorhabditis elegans Somatic Tissues. Genetics 206:757-774
Kotagama, Kasuen; Chang, Yung; Mangone, Marco (2015) miRNAs as Biomarkers in Chronic Myelogenous Leukemia. Drug Dev Res 76:278-85
Kotagama, Kasuen; Babb, Cody S; Wolter, Justin M et al. (2015) A human 3'UTR clone collection to study post-transcriptional gene regulation. BMC Genomics 16:1036
Wolter, Justin M; Kotagama, Kasuen; Babb, Cody S et al. (2015) Detection of miRNA Targets in High-throughput Using the 3'LIFE Assay. J Vis Exp :e52647
Wolter, Justin M; Kotagama, Kasuen; Pierre-Bez, Alexandra C et al. (2014) 3'LIFE: a functional assay to detect miRNA targets in high-throughput. Nucleic Acids Res 42:e132