RNA sequencing identifies specific PIWI-interacting small non-coding RNA expression patterns in breast cancer
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Adnan Hashim1,*, Francesca Rizzo1,*, Giovanna Marchese1, Maria Ravo1, Roberta Tarallo1, Giovanni Nassa1, Giorgio Giurato1, Gianluca Santamaria1, Angela Cordella2, Concita Cantarella3 and Alessandro Weisz1,4
1 Laboratory of Molecular Medicine and Genomics, Faculty of Medicine and Surgery, University of Salerno, Baronissi, SA, Italy
2 Fondazione IRCCS SDN, Napoli, Italy
3 Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Centro di Ricerca per l’Orticoltura, Pontecagnano, SA, Italy
4 Division of Molecular Pathology and Medical Genomics, ‘SS. Giovanni di Dio e Ruggi d’Aragona' Hospital, University of Salerno, Salerno, Italy
* These authors contributed equally to this work
Alessandro Weisz, email:
Keywords: Breast cancer; PIWI; piRNAs; RNA-sequencing; Small non-coding RNA; Estrogen receptor
Received: June 30, 2014 Accepted: September 15, 2014 Published: September 16, 2014
PIWI-interacting small non-coding RNAs (piRNAs) are genetic and epigenetic regulatory factors in germline cells, where they maintain genome stability, are involved in RNA silencing and regulate gene expression. We found that the piRNA biogenesis and effector pathway are present in human breast cancer (BC) cells and, analyzing smallRNA-Seq data generated from BC cell lines and tumor biopsies, we identified >100 BC piRNAs, including some very abundant and/or differentially expressed in mammary epithelial compared to BC cells, where this was influenced by estrogen or estrogen receptor β, and in cancer respect to normal breast tissues. A search for mRNAs targeted by the BC piRNome revealed that eight piRNAs showing a specific expression pattern in breast tumors target key cancer cell pathways. Evidence of an active piRNA pathway in BC suggests that these small non-coding RNAs do exert transcriptional and post-transcriptional gene regulatory actions also in cancer cells.
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