Shining light on single-strand lesions caused by the chemotherapy drug bleomycin
Artikel i vetenskaplig tidskrift, 2021

Quantification of the DNA damage induced by chemotherapy in patient cells may aid in personalization of the dose used. However, assays to evaluate individual patient response to chemotherapy are not available today. Here, we present an assay that quantifies single-stranded lesions caused by the chemotherapeutic drug Bleomycin (BLM) in peripheral blood mononuclear cells (PBMCs) isolated from healthy individuals. We use base excision repair (BER) enzymes to process the DNA damage induced by BLM and then extend the processed sites with fluorescent nucleotides using a DNA polymerase. The fluorescent patches are quantified on single DNA molecules using fluorescence microscopy. Using the assay, we observe a significant variation in the in vitro induced BLM damage and its repair for different individuals. Treatment of the cells with the BER inhibitor CRT0044876 leads to a lower level of repair of BLM-induced damage, indicating the ability of the assay to detect a compromised DNA repair in patients. Overall, the data suggest that our assay could be used to sensitively detect the variation in BLM-induced DNA damage and repair in patients and can potentially be able to aid in personalizing patient doses.

Single-strand breaks

Damage mechanism of drugs

DNA damage

Fluorescence microscopy

Single molecule imaging

Personalizing chemotherapy

BER inhibition


Vandana Singh

Chalmers, Biologi och bioteknik, Kemisk biologi

Sahlgrenska universitetssjukhuset

Pegah Johansson

Göteborgs universitet

Sahlgrenska universitetssjukhuset

Yii Lih Lin

Chalmers, Biologi och bioteknik, Kemisk biologi

Ola Hammarsten

Göteborgs universitet

Sahlgrenska universitetssjukhuset

Fredrik Westerlund

Chalmers, Biologi och bioteknik, Kemisk biologi

DNA Repair

1568-7864 (ISSN) 15687856 (eISSN)

Vol. 105 103153

Genomic diagnostics beyond the sequence (BeyondSeq)

Europeiska kommissionen (EU) (EC/H2020/634890), 2015-06-01 -- 2019-12-31.


Klinisk laboratoriemedicin

Farmakologi och toxikologi






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