DNA polymerase POLD1 promotes proliferation and metastasis of bladder cancer by stabilizing MYC

Yejinpeng Wang, Lingao Ju, Gang Wang, Kaiyu Qian, Wan Jin, Mingxing Li, Jingtian Yu, Yiliang Shi, Yongzhi Wang, Yi Zhang (), Yu Xiao () and Xinghuan Wang ()
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Yejinpeng Wang: Zhongnan Hospital of Wuhan University
Lingao Ju: Zhongnan Hospital of Wuhan University
Gang Wang: Zhongnan Hospital of Wuhan University
Kaiyu Qian: Zhongnan Hospital of Wuhan University
Wan Jin: ZGC Life Sciences Park
Mingxing Li: Zhongnan Hospital of Wuhan University
Jingtian Yu: Zhongnan Hospital of Wuhan University
Yiliang Shi: Zhongnan Hospital of Wuhan University
Yongzhi Wang: Zhongnan Hospital of Wuhan University
Yi Zhang: ZGC Life Sciences Park
Yu Xiao: Zhongnan Hospital of Wuhan University
Xinghuan Wang: Zhongnan Hospital of Wuhan University

Nature Communications, 2023, vol. 14, issue 1, 1-17

Abstract: Abstract To date, most studies on the DNA polymerase, POLD1, have focused on the effect of POLD1 inactivation mutations in tumors. However, the implications of high POLD1 expression in tumorigenesis remains elusive. Here, we determine that POLD1 has a pro-carcinogenic role in bladder cancer (BLCA) and is associated to the malignancy and prognosis of BLCA. Our studies demonstrate that POLD1 promotes the proliferation and metastasis of BLCA via MYC. Mechanistically, POLD1 stabilizes MYC in a manner independent of its’ DNA polymerase activity. Instead, POLD1 attenuates FBXW7-mediated ubiquitination degradation of MYC by directly binding to the MYC homology box 1 domain competitively with FBXW7. Moreover, we find that POLD1 forms a complex with MYC to promote the transcriptional activity of MYC. In turn, MYC increases expression of POLD1, forming a POLD1-MYC positive feedback loop to enhance the pro-carcinogenic effect of POLD1-MYC on BLCA. Overall, our study identifies POLD1 as a promotor of BCLA via a MYC driven mechanism and suggest its potential as biomarker for BLCA.

Date: 2023
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DOI: 10.1038/s41467-023-38160-x

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