A comparative analysis of BrdU and EdU genotoxicity shows that trypanosomatids exhibit unique responses to the presence of these thymidine analogs in their DNA

EdU shows greater genotoxic potential than BrdU in Trypanosoma cruzi, Trypanosoma brucei, and Leishmania major, with markedly different DNA-damage responses across species.

• Why it matters: DNA synthesis labeling with thymidine analogs is common, yet genotoxic effects in trypanosomatids were previously unreported, leaving uncertainty about whether observed damage is relevant under typical experimental conditions.
• What they did: The study tested BrdU and EdU toxicity across three pathogenic trypanosomatids and complemented experiments with in silico assays comparing how the ethynyl group affects DNA structure after incorporation.
• The result: T. cruzi stops replicating and accumulates in S phase, T. brucei tolerates lesions, and part of L. major shows altruistic behavior benefiting survivors, implying EdU use should be preceded by rigorous preliminary analysis.

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