In recent years, the connection between APOBEC3 cytosine deaminases and cancer mutagenesis has become ever more apparent. This growing awareness and lack of inhibitory drugs has created a distinct need for biochemical tools that can be used to identify and characterize potential inhibitors of this family of enzymes. In response to this challenge, we have developed a Real-time APOBEC3-mediated DNA Deamination (RADD) assay. The RADD assay provides a rapid, real-time fluorescence readout of APOBEC3 DNA deamination and serves as a crucial addition to the existing APOBEC3 biochemical and cellular toolkit. This method improves upon contemporary DNA deamination assays by offering a more rapid and quantifiable readout as well as providing a platform that is readily adaptable to a high-throughput format for inhibitor discovery. In this chapter we provide a detailed guide for the usage of the RADD assay for the characterization of APOBEC3 enzymes and potential inhibitors.
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http://dx.doi.org/10.1016/bs.mie.2024.08.001 | DOI Listing |
Proc Natl Acad Sci U S A
January 2025
Program in Genetics, Molecular, and Cellular Biology, Tufts University Graduate School of Biomedical Sciences, Boston, MA 02111.
CAG/CTG repeats are prone to expansion, causing several inherited human diseases. The initiating sources of DNA damage which lead to inaccurate repair of the repeat tract to cause expansions are not fully understood. Expansion-prone CAG/CTG repeats are actively transcribed and prone to forming stable R-loops with hairpin structures forming on the displaced single-stranded DNA (S-loops).
View Article and Find Full Text PDFCancer Control
January 2025
School of Basic Medical Sciences, Anhui Medical University, Hefei, China.
Introduction: and mutations are frequently detected in lung adenocarcinoma (LUAD). Tumor mutational signature (TMS) determination is an approach to identify somatic mutational patterns associated with pathogenic factors. In this study, through the analysis of TMS, the underlying pathogenic factors of LUAD with and mutations were traced.
View Article and Find Full Text PDFGut
December 2024
Biotech Research and Innovation Center (BRIC), Department of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Background And Objective: Ampullary carcinoma (AMPAC) taxonomy is based on morphology and immunohistochemistry. This classification lacks prognostic reliability and unique genetic associations. We applied an approach of integrative genomics characterising patients with AMPAC exploring molecular subtypes that may guide personalised treatments.
View Article and Find Full Text PDFJ Virol
December 2024
Department of Biochemistry, Microbiology, and Immunology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
Several APOBEC3 enzymes restrict HIV-1 by deaminating cytosine to form uracil in single-stranded proviral (-)DNA. However, HIV-1 Vif counteracts their activity by inducing their proteasomal degradation. This counteraction by Vif is incomplete, as evidenced by footprints of APOBEC3-mediated mutations within integrated proviral genomes of people living with HIV-1.
View Article and Find Full Text PDFBMB Rep
December 2024
Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, 34141, South Korea.
Base excision repair (BER) is an essential cellular mechanism that repairs small, non-helix-distorting base lesions in DNA, resulting from oxidative damage, alkylation, deamination, or hydrolysis. This review highlights recent advances in understanding the molecular mechanisms of BER enzymes through single-molecule studies. We discuss the roles of DNA glycosylases in lesion recognition and excision, with a focus on facilitated diffusion mechanisms such as sliding and hopping that enable efficient genome scanning.
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