Integrity and quantity of salivary cell-free DNA as a potential molecular biomarker in oral cancer: a preliminary study

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URI: http://hdl.handle.net/10347/29238
ISSN: 0904-2512
E-ISSN: 1600-0714
DOI: 10.1111/jop.13299

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2022

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Wiley
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ALU repeat| DNA integrity| Liquid biopsy| Oral Squamous Cell Carcinoma (OSCC)| Saliva| Salivary cell-free DNA (scfDNA)

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J Oral Pathol Med.2022;51:429–435

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Background: differences in cell-free DNA (cfDNA) fragments have been described as a valuable tool to distinguish cancer patients from healthy individuals. We aim to investigate the concentration and integrity of cfDNA fragments in saliva from oral squamous cell carcinoma (OSCC) patients and healthy individuals in order to explore their value as diagnostic biomarkers. Methods: saliva samples were collected from a total of 34 subjects (19 OSCC patients and 15 healthy controls). The total concentration of salivary cfDNA (scfDNA) was determined using a fluorometry method and quantitative real-time polymerase chain reaction (qPCR). To evaluate the scfDNA quantity and integrity, qPCR targeting Arthobacter luteus (ALU) sequences at three amplicons of different lengths (60, 115, and 247 bp, respectively) was carried out. ScfDNA integrity indexes (ALU115/ALU60 and ALU247/ALU60) were calculated as the ratio between the absolute concentration of the longer amplicons 115 bp and 247 bp and the total scfDNA amount (amplicon 60 bp).Results: the total scfDNA concentration (ALU60) was higher in OSCC than in healthy donors, but this trend was not statistically significant. The medians of scfDNA integrity indexes, ALU115/ALU60 and ALU247/ALU60, were significantly higher in OSCC, showing area under the curve values of 0.8211 and 0.7018, respectively. Conclusion: our preliminary results suggest that scfDNA integrity indexes (ALU115/ALU60 and ALU247/ALU60) have potential as noninvasive diagnostic biomarkers for OSCC

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© 2022 The Authors. Journal of Oral Pathology & Medicine published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited
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Cirurxía e Especialidades Médico-Cirúrxicas
Psiquiatría, Radioloxía, Saúde Pública, Enfermaría e Medicina