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Fendt L, Fazzini F, Weissensteiner H, Bruckmoser E, Schönherr S, Schäfer G, Losso JL, Streiter GA, Lamina C, Rasse M, Klocker H, Kofler B, Kloss-Brandstätter A, Huck CW, Kronenberg F, Laimer J. Profiling of Mitochondrial DNA Heteroplasmy in a Prospective Oral Squamous Cell Carcinoma Study. Cancers (Basel) 2020; 12:E1933. [PMID: 32708892 PMCID: PMC7409097 DOI: 10.3390/cancers12071933] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/13/2020] [Accepted: 07/15/2020] [Indexed: 01/25/2023] Open
Abstract
While a shift in energy metabolism is essential to cancers, the knowledge about the involvement of the mitochondrial genome in tumorigenesis and progression in oral squamous cell carcinoma (OSCC) is still very limited. In this study, we evaluated 37 OSCC tumors and the corresponding benign mucosa tissue pairs by deep sequencing of the complete mitochondrial DNA (mtDNA). After extensive quality control, we identified 287 variants, 137 in tumor and 150 in benign samples exceeding the 1% threshold. Variant heteroplasmy levels were significantly increased in cancer compared to benign tissues (p = 0.0002). Furthermore, pairwise high heteroplasmy frequency difference variants (∆HF% > 20) with potential functional impact were increased in the cancer tissues (p = 0.024). Fourteen mutations were identified in the protein-coding region, out of which thirteen were detected in cancer and only one in benign tissue. After eight years of follow-up, the risk of mortality was higher for patients who harbored at least one ∆HF% > 20 variant in mtDNA protein-coding regions relative to those with no mutations (HR = 4.6, (95%CI = 1.3-17); p = 0.019 in primary tumor carriers). Haplogroup affiliation showed an impact on survival time, which however needs confirmation in a larger study. In conclusion, we observed a significantly higher accumulation of somatic mutations in the cancer tissues associated with a worse prognosis.
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Affiliation(s)
- Liane Fendt
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
| | - Federica Fazzini
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
| | - Hansi Weissensteiner
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
| | - Emanuel Bruckmoser
- Oral and Maxillofacial Surgeon, Private Practice, A-5020 Salzburg, Austria;
| | - Sebastian Schönherr
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
| | - Georg Schäfer
- Institute for Pathology, Neuropathology and Molecular Pathology, Medical University of Innsbruck, A-6020 Innsbruck, Austria;
| | - Jamie Lee Losso
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
| | - Gertraud A. Streiter
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
| | - Claudia Lamina
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
| | - Michael Rasse
- University Hospital for Craniomaxillofacial and Oral Surgery, Medical University of Innsbruck, A-6020 Innsbruck, Austria;
- Clinic for Maxillofacial Surgery, Sechenov University, Trubetskaya Str. 8 b.2, 119992 Moscow, Russia
| | - Helmut Klocker
- Division of Experimental Urology, Department of Urology, Medical University of Innsbruck, A-6020 Innsbruck, Austria;
| | - Barbara Kofler
- Department of Otorhinolaryngology, Medical University of Innsbruck, Anichstrasse 35, A-6020 Innsbruck, Austria;
| | - Anita Kloss-Brandstätter
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
- Carinthia University of Applied Sciences, A-9524 Villach, Austria
| | - Christian W. Huck
- Institute of Analytical Chemistry and Radiochemistry, CCB-Center for Chemistry and Biomedicine, Leopold Franzens University Innsbruck, A-6020 Innsbruck, Austria;
| | - Florian Kronenberg
- Institute of Genetic Epidemiology, Department of Genetics and Pharmacology, Medical University of Innsbruck, A-6020 Innsbruck, Austria; (L.F.); (F.F.); (H.W.); (S.S.); (J.L.L.); (G.A.S.); (C.L.); (A.K.-B.); (F.K.)
| | - Johannes Laimer
- University Hospital for Craniomaxillofacial and Oral Surgery, Medical University of Innsbruck, A-6020 Innsbruck, Austria;
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