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lncRNA CISAL Inhibits BRCA1 Transcription by Forming a Tertiary Structure at Its Promoter.

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机构: [1]Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation of Sun Yat-Sen Memorial Hospital,Guangzhou 510120, China [2]Department of Oral and Maxillofacial Surgery, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University,Guangzhou 510120, China [3]Department of Neurobiology, Key Laboratory of Human Functional Genomics of Jiangsu, Nanjing Medical University, Nanjing, Jiangsu 211166, China [4]Nanchang Key Laboratory of Cancer Pathogenesis and Translational Research,Center Laboratory, the Third Affiliated Hospital, Nanchang University, Nanchang 330047,China [5]State University of New Yorkat Stony Brook, Stony Brook,NY 11794, USA [6]Department of Stomatology, Longgang Distric Central Hospital,Affliated to Guangzhou University of Traditional Chinese Medicine, Shenzhen,Guangdong 518116, China [7]Massachusetts General Hospital Cancer Center,Harvard Medical School,Boston, MA 02114, USA [8]Department of Oral and Maxillofacial Surgery, Hainan General Hospital, Hainan 570300, China [9]Guanghua School of Stomatology, Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou510055, China [10]Department of Surgery,Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street,Boston, MA 02114, USA [11]Department of Oral Medicine, Sun Yat-Sen Memorial Hospital of SunYat-Sen University,Guangzhou 510120, China [12]Experimental Therapeuticsand Molecular Imaging Lab,Department of Neurology,Massachusetts General Hospital and Harvard Medical School, Boston, MA 02129,USA
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Cisplatin-based neoadjuvant chemotherapy has been shown to improve survival in patients with squamous cell carcinoma (SCC), but clinical biomarkers to predict chemosensitivity remain elusive. Here, we show the long noncoding RNA (lncRNA) LINC01011, which we termed cisplatin-sensitivity-associated lncRNA (CISAL), controls mitochondrial fission and cisplatin sensitivity by inhibiting BRCA1 transcription in tongue SCC (TSCC) models. Mechanistically, we found CISAL directly binds the BRCA1 promoter and forms an RNA-DNA triplex structure, sequestering BRCA1 transcription factor-GABPA away from the downstream regulatory binding region. Importantly, the clinical relevance of these findings is suggested by the significant association of CISAL and BRCA1 expression levels in TSCC tumors with neoadjuvant chemosensitivity and overall survival. We propose a new model where lncRNAs are tethered at gene promoter by RNA-DNA triplex formation, spatially sequestering transcription factors away from DNA-binding sites. Our study uncovers the potential of CISAL-BRCA1 signaling as a potential target to predict or improve chemosensitivity. Copyright © 2020 The Author(s). Published by Elsevier Inc. All rights reserved.

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大类 | 2 区 综合性期刊
小类 | 2 区 综合性期刊
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Q1 MULTIDISCIPLINARY SCIENCES

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第一作者机构: [1]Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation of Sun Yat-Sen Memorial Hospital,Guangzhou 510120, China [2]Department of Oral and Maxillofacial Surgery, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University,Guangzhou 510120, China
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通讯机构: [1]Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation of Sun Yat-Sen Memorial Hospital,Guangzhou 510120, China [2]Department of Oral and Maxillofacial Surgery, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University,Guangzhou 510120, China
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