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Background <p>The NONO protein plays a crucial role in RNA metabolism and DNA repair. It undergoes various post-translational modifications, including phosphorylation, ubiquitination, acetylation and methylation, all of which regulate its diverse cellular functions. However, the role of O-GlcNAcylation in regulating NONO's function in DNA damage repair is not well understood.</p> Results <p>This study demonstrates that O-GlcNAcylation of NONO at Serine 147 (Ser147) is essential for its recruitment to DNA damage sites. Specifically, O-GlcNAcylation at Ser147 reduces NONO ubiquitination and stabilizes its interaction with SFPQ, regulating the alternative splicing of the histone methyltransferase SETMAR. A deficiency in O-GlcNAcylation at Ser 147 impairs NONO's binding to SETMAR pre-mRNA, leading to an increased production of the truncated isoform of SETMAR (SETMAR-S). The resulting SETMAR-S suppresses the generation of H3K36me2 and inhibits the recruitment of Ku70 at DNA damage sites, ultimately impairing non-homologous end joining (NHEJ) repair. Furthermore, the disruption of O-GlcNAcylation at Ser147 sensitizes liver cancer cells to ionizing radiation treatment, both in vitro and in vivo.</p> Conclusions <p>O-GlcNAcylation at Ser 147 of NONO mediates the alternative splicing of SETMAR and facilitates NHEJ repair. Collectively, our findings suggest that targeting NONO O-GlcNAcylation may provide a novel therapeutic strategy for cancer treatment.</p>

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O-GlcNAcylation of NONO mediates alternative splicing of SETMAR and facilitates NHEJ repair

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月14日

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  • Mengyuan Li,
  • Huanna Tian,
  • Ziyi Zhou,
  • Yuhan Jiang,
  • Xiaomeng Guo,
  • Weijie Qin,
  • Hongbing Zhang,
  • Yajie Jiao,
  • Shuai Guo,
  • Chen Wu

摘要

Background

The NONO protein plays a crucial role in RNA metabolism and DNA repair. It undergoes various post-translational modifications, including phosphorylation, ubiquitination, acetylation and methylation, all of which regulate its diverse cellular functions. However, the role of O-GlcNAcylation in regulating NONO's function in DNA damage repair is not well understood.

Results

This study demonstrates that O-GlcNAcylation of NONO at Serine 147 (Ser147) is essential for its recruitment to DNA damage sites. Specifically, O-GlcNAcylation at Ser147 reduces NONO ubiquitination and stabilizes its interaction with SFPQ, regulating the alternative splicing of the histone methyltransferase SETMAR. A deficiency in O-GlcNAcylation at Ser 147 impairs NONO's binding to SETMAR pre-mRNA, leading to an increased production of the truncated isoform of SETMAR (SETMAR-S). The resulting SETMAR-S suppresses the generation of H3K36me2 and inhibits the recruitment of Ku70 at DNA damage sites, ultimately impairing non-homologous end joining (NHEJ) repair. Furthermore, the disruption of O-GlcNAcylation at Ser147 sensitizes liver cancer cells to ionizing radiation treatment, both in vitro and in vivo.

Conclusions

O-GlcNAcylation at Ser 147 of NONO mediates the alternative splicing of SETMAR and facilitates NHEJ repair. Collectively, our findings suggest that targeting NONO O-GlcNAcylation may provide a novel therapeutic strategy for cancer treatment.