Silly Toure1, Fatimata Mbaye2, Mame Diarra Gueye2, Malick Fall3, Ahmadou Dem4, Jean Baptiste Lamy5,6, Mbacké Sembene2. 1. Department of Maxillofacial Surgery and Stomatology University Hospital Center Aristide le Dantec, Dakar, Senegal. 2. GENGESPOP Team, Department of Animal Biology, Faculty of Science and Technology, Cheikh Anta Diop University, Dakar, Senegal. Email: fatimata.mbaye@ucad.edu.sn 3. Department of Animal Biology, Faculty of Science and Technology, Cheikh Anta Diop University, Dakar, Senegal. 4. Cancer Institut, Faculty of Medicine, Pharmacy and Stomatology, Cheikh Anta Diop University, Dakar, Senegal. 5. LIMICS, Université Paris 13, Sorbonne Paris Cité, 93017 Bobigny, France, INSERM UMRS 1142, UPMC Université Paris 6, Sorbonne Université, Paris, France. 6. Laboratoire de Recherche en Informatique (LRI), CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France.
Abstract
Background: Somatic mutations affecting the mitochondrial DNA (mtDNA) have been frequently observed in human cancers and proposed as important oncological biomarkers. However, the exact mtDNA mutations that is responsible for the pathogenesis of cancer remains unclear. The aim of this study was to investigate somatic mutations in the MT-CYB and D-Loop regions of mitochondrial DNA (mtDNA) in oral cavity cancers from Senegalese patients. Methods: MT-CYB and the D-Loop of mtDNA derived from 45 oral cavity cancer tissues and 21 control blood samples were assessed by PCR and sequencing. The sequences of MT-CYB and the D-Loop from cancerous tissues were compared with control sequences, and sequence differences were recognized as somatic mutations. Results: Overall, 389 somatic mtDNA mutations were identified, most of which (79.43%) were located in the D-Loop region. The majority of base substitution mutations were G-to-A (63.93%) and T-to-C (16.39%) transitions. In the protein-coding MT-CYB gene, 29 missense mutations were observed. The pathogenic mutation load of MT-CYB was 3.11%. Pathogenic mutations were carried by 25% of patients. pArg76Pro (pArg282Pro in rCRS) was novel and was the most common pathogenic mutation observed. Conclusion: These results strongly indicate that mtDNA mutations are a potential marker of oral cavity cancer.
Background: Somatic mutations affecting the mitochondrial DNA (mtDNA) have been frequently observed in human cancers and proposed as important oncological biomarkers. However, the exact mtDNA mutations that is responsible for the pathogenesis of cancer remains unclear. The aim of this study was to investigate somatic mutations in the MT-CYB and D-Loop regions of mitochondrial DNA (mtDNA) in oral cavity cancers from Senegalese patients. Methods: MT-CYB and the D-Loop of mtDNA derived from 45 oral cavity cancer tissues and 21 control blood samples were assessed by PCR and sequencing. The sequences of MT-CYB and the D-Loop from cancerous tissues were compared with control sequences, and sequence differences were recognized as somatic mutations. Results: Overall, 389 somatic mtDNA mutations were identified, most of which (79.43%) were located in the D-Loop region. The majority of base substitution mutations were G-to-A (63.93%) and T-to-C (16.39%) transitions. In the protein-coding MT-CYB gene, 29 missense mutations were observed. The pathogenic mutation load of MT-CYB was 3.11%. Pathogenic mutations were carried by 25% of patients. pArg76Pro (pArg282Pro in rCRS) was novel and was the most common pathogenic mutation observed. Conclusion: These results strongly indicate that mtDNA mutations are a potential marker of oral cavity cancer.
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