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<p>Lysine lactylation is a post-translational modification induced by lactate discovered in recent years. Abnormal lysine lactylation contributes to the occurrence and progression of various tumors. However, the mediators and downstream targets of lysine lactylation remain unclear. Here, we report that HAT1 serves as a potential lactyltransferase that can promote homologous recombination and lead to radioresistance by regulating lactylation of RPA1. Lactylation of RPA1 facilitates its binding to single-stranded DNA and MRE11-RAD50-NBS1 (MRN) complexes and promotes homologous recombination. HAT1 knockout inhibits DNA repair in lung adenocarcinoma cells, thereby increasing radiotherapy sensitivity. Interestingly, we also found that K15 auto-lactylation of HAT1 can modulate its lactyltransferase activity. In conclusion, our research reveals that HAT1-regulated RPA1 lactylation plays an important role in homologous recombination and radioresistance, suggesting that HAT1 may become a potential therapeutic target for reversing the radioresistance caused by lactate accumulation in cancer cells.</p>

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HAT1 functions as a lactyltransferase and mediates RPA1 lactylation to promote DNA repair and radioresistance in lung adenocarcinoma

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月21日

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  • Jiang He,
  • Tangmin Lai,
  • Yuzu Zhao,
  • Zhiying Zhou,
  • Liu Zhou,
  • Dan Tao,
  • Haonan Yang,
  • Nan Li,
  • Yu He,
  • Shuheng Yang,
  • Zheng Tang,
  • Siwei Zeng,
  • Erha Munai,
  • Yanchen Liu,
  • Yuanyuan Tan,
  • Wei Zhou,
  • Yongzhong Wu

摘要

Lysine lactylation is a post-translational modification induced by lactate discovered in recent years. Abnormal lysine lactylation contributes to the occurrence and progression of various tumors. However, the mediators and downstream targets of lysine lactylation remain unclear. Here, we report that HAT1 serves as a potential lactyltransferase that can promote homologous recombination and lead to radioresistance by regulating lactylation of RPA1. Lactylation of RPA1 facilitates its binding to single-stranded DNA and MRE11-RAD50-NBS1 (MRN) complexes and promotes homologous recombination. HAT1 knockout inhibits DNA repair in lung adenocarcinoma cells, thereby increasing radiotherapy sensitivity. Interestingly, we also found that K15 auto-lactylation of HAT1 can modulate its lactyltransferase activity. In conclusion, our research reveals that HAT1-regulated RPA1 lactylation plays an important role in homologous recombination and radioresistance, suggesting that HAT1 may become a potential therapeutic target for reversing the radioresistance caused by lactate accumulation in cancer cells.