Abstract
Although genome-wide association studies (GWASs) have identified over 100 colorectal cancer (CRC) risk loci, an understanding of causal genes or risk variants and their biological functions in these loci remain unclear. Recently, genomic loci 10q26.12 with lead SNP rs1665650 was identified as an essential CRC risk loci of Asian populations. However, the functional mechanism of this region has not been fully clarified. Here, we applied an RNA interfering-based on-chip approach to screen for the genes essential for cell proliferation in the CRC risk loci 10q26.12. Notably, HSPA12A had the most significant effect among the identified genes and functioned as a crucial oncogene facilitating cell proliferation. Moreover, we conducted an integrative fine-mapping analysis to identify putative casual variants and further explored their association with CRC risk in a large-scale Chinese population consisting of 4054 cases and 4054 controls and also independently validated in 5208 cases and 20,832 controls from the UK biobank cohort. We identified a risk SNP rs7093835 in the intron of HSPA12A that was significantly associated with an increased risk of CRC (OR 1.23, 95% CI 1.08–1.41, P = 1.92 × 10–3). Mechanistically, the risk variant could facilitate an enhancer–promoter interaction mediated by the transcriptional factor (TF) GRHL1 and ultimately upregulate HSPA12A expression, which provides functional evidence to support our population findings. Collectively, our study reveals the important role of HSPA12A in CRC development and illustrates a novel enhancer–promoter interaction module between HSPA12A and its regulatory elements rs7093835, providing new insights into the etiology of CRC.
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Acknowledgements
We are grateful to every patient, their families, and referring physicians that have participated in these studies, and the numerous members of our laboratories for their valuable contributions over many years.
Funding
This work was supported by the Program of National Science Fund for Distinguished Young Scholars of China (NSFC-81925032), Key Program of National Natural Science Foundation of China (NSFC-82130098), and Natural Science Foundation of Hubei Province (2019CFA009) for Xiaoping Miao; National Natural Science Foundation of China (NSFC-82103929, NSFC-82273713), Fundamental Research Funds for the Central Universities (WHU:2042022kf1205), Knowledge Innovation Program of Wuhan (whkxjsj011), and Translational Medicine and Interdisciplinary Research Joint Fund of Zhongnan Hospital of Wuhan University (ZNJC202207) for Jianbo Tian; Youth Program of National Natural Science Foundation of China (NSFC-82003547) and Fundamental Research Funds for the Central Universities (WHU: 2042022kf1031) for Ying Zhu.
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JT, BL, and XM were the overall principal investigators in this study who conceived the study and obtained financial support, YZ, HL, JT, BL, and XM were responsible for the study design and supervised the entire study. BL, ZL, and FZ performed statistical analyses, interpreted the results, and drafted the initial manuscript. BL, LF, YC, CC, GL, MZ, JH, CN, YL, WW, HG, YL, SC, HL, SY, HZ, and WT performed laboratory experiments, TY, JL, CH, XY, BX, YZ, RZ, HL, JT, BL, and XM were responsible for patient recruitment and sample preparation. All authors approved the final report for publication.
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Lu, Z., Fan, L., Zhang, F. et al. HSPA12A was identified as a key driver in colorectal cancer GWAS loci 10q26.12 and modulated by an enhancer–promoter interaction. Arch Toxicol 97, 2015–2028 (2023). https://doi.org/10.1007/s00204-023-03494-4
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DOI: https://doi.org/10.1007/s00204-023-03494-4