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A Novel Fluorescence Nanobiosensor based on Modified Graphene Quantum dots-HTAB for Early Detection of Fetal Sexuality with Cell Free Fetal DNA

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Abstract

Recently, prenatal diagnosis with non-invasive insight is a progressive approach in clinical medicine to prevent the birth of infants with genetic abnormalities. Cell free fetal DNA (cffDNA) makes up approximately 3–6% of the bare DNA in the mother's bloodstream which is produced during pregnancy and can be used to detect fetal sex and disease in the early stages. SRY is a gene located on the chromosome Y which determines the sex of male infants. In this work, a new nanobiosensor based on the fluorescence property of r-GQD@HTAB (reduced graphene quantum dots modified with hexadecyl trimethyl ammonium bromide) was fabricated that can identify the SRY gene in cffDNA with high sensitivity and specificity. A detection limit of 0.082 nM and the linear response range of 0.16–1.5 nM was obtained for the method. It was able to discriminate the target sequence with high specificity from the non-target sequences. This biosensor includes a new graphene quantum dot modified with a surfactant, HTAB which leads to high fluorescence emission of it and then more precise differentiation between ssDNA and DsDNA in a solution. In conclusion, it provides a novel analytical tool for detection of small amount of DNA and fetal sex and genetic diseases in early stage with prenatal and noninvasive tests and applicable for clinical use.

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Acknowledgements

The authors acknowledge the instrumental support of the University of Tehran.

Funding

This work was supported by the University of Tehran.

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All authors contributed to the study. Material preparation, data collection and experimental works were performed by BOH. The manuscript was written by MR and conceptualization, methodology and visualization were done by MR FF supported a part of conceptualization, methodology and instrumental.

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Correspondence to Mahdi Rahaie.

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Rahaie, M., Ostad-hasanzadeh, B. & Faridbod, F. A Novel Fluorescence Nanobiosensor based on Modified Graphene Quantum dots-HTAB for Early Detection of Fetal Sexuality with Cell Free Fetal DNA. J Fluoresc 31, 1843–1853 (2021). https://doi.org/10.1007/s10895-021-02809-x

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  • DOI: https://doi.org/10.1007/s10895-021-02809-x

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