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Abstract
Protein products of the regenerating islet-derived (REG) gene family are important regulators of many cellular processes. Here we functionally characterise a non-protein coding product of the family, the long noncoding RNA (lncRNA) REG1CP that is transcribed from a DNA fragment at the family locus previously thought to be a pseudogene. REG1CP forms an RNA–DNA triplex with a homopurine stretch at the distal promoter of the REG3A gene, through which the DNA helicase FANCJ is tethered to the core promoter of REG3A where it unwinds double stranded DNA and facilitates a permissive state for glucocorticoid receptor α (GRα)-mediated REG3A transcription. As such, REG1CP promotes cancer cell proliferation and tumorigenicity and its upregulation is associated with poor outcome of patients. REG1CP is also transcriptionally inducible by GRα, indicative of feedforward regulation. These results reveal the function and regulation of REG1CP and suggest that REG1CP may constitute a target for cancer treatment.
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1 School of Biomedical Sciences and Pharmacy, School of Medicine and Public Health, School of Environmental and Life Sciences, The University of Newcastle, Newcastle, NSW, Australia
2 Translational Research Institute, Henan Provincial People’s Hospital, The Academy of Medical Sciences, Zhengzhou University, Zhengzhou, Henan, China
3 Department of Pathophysiology, School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, Sichuan, China
4 Department of Otolaryngology, Shanxi Key Laboratory of Otorhinolaryngology Head and Neck Cancer, the first affiliated hospital, Shanxi Medical University, Taiyuan, Shanxi, China
5 Department of Molecular Biology, Department of Pathology, Shanxi Cancer Hospital and Institute, Shanxi Medical University, Taiyuan, Shanxi, China
6 Children’s Cancer Institute Australia for Medical Research, University of New South Wales, Sydney, NSW, Australia
7 School of Biomedical Sciences and Pharmacy, School of Medicine and Public Health, School of Environmental and Life Sciences, The University of Newcastle, Newcastle, NSW, Australia; Translational Research Institute, Henan Provincial People’s Hospital, The Academy of Medical Sciences, Zhengzhou University, Zhengzhou, Henan, China