目的探讨mRNA m7G修饰在人胃食管交界处腺癌(AEG)发生发展中的潜在作用。
方法选取2018年至2019年就诊于江苏大学附属人民医院的4例接受手术治疗的AEG患者病理组织标本为研究对象。收集患者AEG组织与癌旁正常组织,提取RNA样品后进行m7G甲基化RNA免疫共沉淀测序(m7G-MeRIP-seq),分析2组m7G修饰模式、m7G修饰差异位点特征、差异表达mRNA特征、差异m7G修饰与mRNA表达量的相关性。应用甲基化RNA免疫共沉淀实时荧光定量PCR(MeRIP-qPCR)对差异m7G修饰位点基因( MSH6、BRCA1、SOX9)进行验证。应用实时荧光定量PCR(RT-qPCR)分析 METTL1与 WDR4基因在2组间的表达情况。本研究已通过江苏省大学附属人民医院医学伦理委员会的审查(批准号:伦研批第20150083号)。
结果①m7G-MeRIP-seq分析结果显示,AEG组织与癌旁正常组织的m7G修饰主要位于mRNA内部起始密码子GC富集区,2组间m7G修饰差异位点基因与癌症密切相关。②mRNA文库分析结果显示,2组间差异表达mRNA在AEG组织中主要呈上调趋势,在癌旁正常组织中主要呈下调趋势。③交叉分析结果显示,AEG组织中超甲基化修饰基因倾向于表达上调,低甲基化修饰基因倾向于表达下调。④MeRIP-qPCR验证结果显示,AEG组织中 MSH6、BRCA1和 SOX9基因mRNA表达量均上调(AEG组织比癌旁正常组织, P<0.05)。⑤RT-qPCR检测结果显示,AEG组织中 METTL1与 WDR4基因mRNA表达量均上调(AEG组织比癌旁正常组织, P<0.000 5)。
结论上述研究成果揭示mRNA m7G修饰可能在AEG的发生与发展中发挥重要作用,METTL1和WDR4蛋白可能通过调节mRNA m7G修饰进而促进AEG的进程,为AEG的分子机制研究与治疗提供相关依据。
ObjectiveTo explore the potential role of mRNA m7G modification in the pathogenesis of human adenocarcinoma of esophagogastric junction (AEG).
MethodsPathological tissue specimens from four AEG patients who underwent surgical treatment at the People′s Hospital Affiliated to Jiangsu University between 2018 and 2019 were selected. Tumor tissues and adjacent normal tissues were collected from these patients. RNA was extracted from both tissue types and subjected to m7G methylated RNA immunoprecipitation sequencing (m7G-MeRIP-seq) to analyze the patterns of m7G modification, the characteristics of differential m7G modification sites, the differentially expressed mRNA, and the correlation between m7G modification and mRNA expression levels. Differential m7G-modified genes ( MSH6, BRCA1, and SOX9) were further validated using methylated RNA immunoprecipitation quantitative PCR (MeRIP-qPCR), while the expression of METTL1 and WDR4 genes was examined by real-time quantitative PCR (RT-qPCR). This study was approved by the Medical Ethics Committee of the People′s Hospital Affiliated to Jiangsu University (Ethics No. 20150083).
Results① m7G-MeRIP-seq analysis revealed that m7G modifications in both AEG and adjacent normal tissues were predominantly located in the GC-rich region surrounding the internal start codon of mRNA. Differential m7G modification sites between the two groups were closely associated with cancer-related genes. ② mRNA library analysis showed that differentially expressed mRNA were predominantly upregulated in AEG tissues and downregulated in adjacent normal tissues. ③ Cross-analysis indicated that genes with hypermethylation tended to exhibit upregulated expression, while genes with hypomethylation were typically downregulated in AEG tissues. ④ MeRIP-qPCR validation confirmed that the mRNA expression of MSH6, BRCA1, and SOX9 were significantly upregulated in AEG tissues compared to adjacent normal tissues (AEG vs. normal, P<0.05). ⑤ RT-qPCR results demonstrated that the mRNA expression levels of METTL1 and WDR4 were also upregulated in AEG tissues (AEG vs. normal, P<0.000 5).
ConclusionThese findings suggest that mRNA m7G modification plays a significant role in the development of AEG. Furthermore, proteins as METTL1 and WDR4 may facilitate AEG progression by regulating mRNA m7G modification. These results provide valuable insights into the molecular mechanisms underlying AEG and may inform future therapeutic strategies for this malignancy.
刘滋验,王晓燕,胡滨滨,等. 人胃食管交界处腺癌mRNA m7G修饰情况的初步分析[J]. 中华医学遗传学杂志,2025,42(02):187-197.
DOI:10.3760/cma.j.cn511374-20240724-00408版权归中华医学会所有。
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