Distinct 5-methylcytosine profiles of LncRNA in breast cancer brain metastasis.

IF 3.4 2区 医学 Q2 ONCOLOGY
Song Wang, Jianran Guo, Xinmiao Xian, Min Li, Anqi Zhang, Yujiao Liu, Yifei Zhang, Shen Chen, Guohao Gu, Xuehua Zhang, Dong Yan, Meng An, Li Pan, Bo Fu
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引用次数: 0

Abstract

Background: Recent studies have identified a complex relationship between methylation patterns and the development of various cancers. Breast cancer (BC) is the second leading cause of cancer mortality among women. Approximately 5-20% of BC patients are at risk of BC brain metastases (BCBM). Although 5-methylcytosine (m5C) has been identified as an important regulatory modifier, its distribution in BCBM is not well understood. This study aimed to investigate the distribution of m5C in BCBM.

Materials and methods: Samples from BCBM (231-BR cells) and BC (MDA-MB-231 cells) groups were subjected to a comprehensive analysis of the m5C methylation in long non-coding RNA (lncRNA) using methylated RNA immunoprecipitation next-generation sequencing (MeRIP-seq). The expression levels of methylated genes in BC and adjacent tissues were verified through quantitative real-time polymerase chain reaction (RT-qPCR). Enrichment pathway analyses were through Gene Ontology (GO) and the Kyoto Encyclopedia of Genes and Genomes (KEGG) to predict the potential functions of m5C in BCBM.

Results: The MeRIP-seq analysis identified 23,934 m5C peaks in BCBM and 21,236 m5C in BC. A total of 9,480 annotated genes (BCBM) and 8,481 annotated genes (BC) were mapped. Notably, 1,819 methylation sites in lncRNA were upregulated in BCBM, whereas 2,415 methylation sites were upregulated in BC. Significant m5C hypermethylated lncRNAs included ENST00000477316, ENST00000478098 and uc002gtt.1, whereas hypomethylated lncRNAs included ENST00000600912, ENST00000493668, ENST00000544651 and ENST00000464989. These results were verified by qPCR and MeRIP-qPCR in BC and BCBM. Considering the strong association between m5C RNA methylation regulators and lncRNA, we examined the expression levels of 13 m5C RNA methylation regulators and observed significant differences between BC tissues and adjacent normal tissues. In addition, the interaction between regulators of altered expression and the differentially expressed genes in vitro was analyzed. The GO and KEGG pathways analyses revealed that genes significantly associated with m5C sites in lncRNA were linked to the BCBM signaling pathways.

Conclusion: This uncovered significant variations in the levels and distribution of m5C in BCBM compared to BC. The findings provide a new theoretical understanding of the mechanisms of BCBM.

LncRNA在乳腺癌脑转移中的5-甲基胞嘧啶谱
背景:最近的研究已经确定了甲基化模式与各种癌症的发展之间的复杂关系。乳腺癌(BC)是妇女癌症死亡的第二大原因。大约5-20%的BC患者存在BC脑转移(BCBM)的风险。虽然5-甲基胞嘧啶(m5C)已被确定为一个重要的调节调节剂,但其在BCBM中的分布尚不清楚。本研究旨在探讨m5C在BCBM中的分布。材料和方法:采用甲基化RNA免疫沉淀新一代测序(MeRIP-seq)技术,对BCBM (231-BR细胞)和BC (MDA-MB-231细胞)组样本进行长链非编码RNA (lncRNA)中m5C甲基化的综合分析。通过实时定量聚合酶链反应(RT-qPCR)验证BC及邻近组织中甲基化基因的表达水平。通过基因本体(GO)和京都基因与基因组百科全书(KEGG)进行富集途径分析,预测m5C在BCBM中的潜在功能。结果:MeRIP-seq分析发现BCBM中有23,934个m5C峰,BC中有21,236个m5C峰。共定位到9480个注释基因(BCBM)和8481个注释基因(BC)。值得注意的是,在BCBM中lncRNA中有1819个甲基化位点上调,而在BC中有2415个甲基化位点上调。显著的m5C高甲基化lncrna包括ENST00000477316、ENST00000478098和uc002gtt。而低甲基化的lncrna包括ENST00000600912、ENST00000493668、ENST00000544651和ENST00000464989。这些结果通过BC和BCBM的qPCR和MeRIP-qPCR验证。考虑到m5C RNA甲基化调节因子与lncRNA之间的强相关性,我们检测了13种m5C RNA甲基化调节因子的表达水平,发现BC组织与邻近正常组织之间存在显著差异。此外,还分析了体外表达改变调控因子与差异表达基因之间的相互作用。GO和KEGG通路分析显示,lncRNA中与m5C位点显著相关的基因与BCBM信号通路相关。结论:与BC相比,这揭示了BCBM中m5C的水平和分布的显著差异。这些发现为BCBM的机制提供了新的理论认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
BMC Cancer
BMC Cancer 医学-肿瘤学
CiteScore
6.00
自引率
2.60%
发文量
1204
审稿时长
6.8 months
期刊介绍: BMC Cancer is an open access, peer-reviewed journal that considers articles on all aspects of cancer research, including the pathophysiology, prevention, diagnosis and treatment of cancers. The journal welcomes submissions concerning molecular and cellular biology, genetics, epidemiology, and clinical trials.
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