畜牧兽医学报 ›› 2025, Vol. 56 ›› Issue (9): 4657-4672.doi: 10.11843/j.issn.0366-6964.2025.09.043

• 基础兽医 • 上一篇    下一篇

Rv3435c重组耻垢分枝杆菌感染小鼠RAW264.7巨噬细胞的转录组分析

刘昕玥1, 李丹妮1, 宗颖2,3,4, 时坤2,3,4, 李健明2,3,4, 刁乃超2,3,4, 曾范利2,3,4,5*, 杜锐2,3,4,5*   

  1. 1. 吉林农业大学动物医学院/动物科技学院, 长春 130118;
    2. 吉林农业大学中药材学院, 长春 130118;
    3. 梅花鹿药用资源利用关键技术研究室, 长春 130118;
    4. 吉林省梅花鹿高效养殖和产品开发技术工程研究中心, 长春 130118;
    5. 教育部动物生产及产品质量安全重点实验室, 长春 130118
  • 收稿日期:2024-12-02 发布日期:2025-09-30
  • 通讯作者: 曾范利,主要从事经济动物疫病防治及人兽共患病防治研究,E-mail:zengfanli@jlau.edu.cn;杜锐,主要从事经济动物疫病防治及人兽共患病防治研究,E-mail:durui@jlau.edu.cn
  • 作者简介:刘昕玥(1999-),女,山东莱州人,硕士生,主要从事经济动物疫病防治研究,E-mail:2892144827@qq.com
  • 基金资助:
    国家自然科学基金联合基金项目(U23A20237)

Transcriptome Analysis of RAW264.7 Macrophages Infected with Rv3435c Recombinant Mycobacterium smegmatis

LIU Xinyue1, LI Danni1, ZONG Ying2,3,4, SHI Kun2,3,4, LI Jianming2,3,4, DIAO Naichao2,3,4, ZENG Fanli2,3,4,5*, DU Rui2,3,4,5*   

  1. 1. College of Veterinary Medicine/College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China;
    2. College of Chinese Medicine Materials, Jilin Agricultural University, Changchun 130118, China;
    3. Research Laboratory on Key Technology of Development and Resource Utilization Sika Deer, Changchun 130118, China;
    4. Jilin Province Sika Deer Efficient Breeding and Product Development Technology Engineering Research Center, Changchun 130118, China;
    5. The Ministry of Education Key Laboratory of Animal Production and the Product Quality and Safety, Changchun 130118, China
  • Received:2024-12-02 Published:2025-09-30

摘要: 前期研究发现,异源表达Rv3435c基因的耻垢分枝杆菌显著抑制巨噬细胞的炎症表达,为了探究Rv3435c基因在该过程行使的功能,使用二代测序分析Rv3435c重组耻垢分枝杆菌感染RAW264.7细胞的转录组差异。结果显示:通过RT-qPCR检测6、12、24、48 h 的IL-1β、TNF-α、IL-6 mRNA表达水平,选择表达量最高的12 h作为转录组测序时间点。将测序获得的原始数据进行数据质量分析及比对结果统计,确定数据质量良好,进行样本关系分析,提示Rv3435c显著改变了小鼠巨噬细胞的基因表达情况。将数据过滤比对共得到14 077个差异基因,其中,有278个显著上调表达基因和118个显著下调表达基因。对差异基因进行GO注释,得到的差异基因主要富集在免疫系统过程、对外部刺激的反应、防御响应等方面。对差异基因进行KEGG通路富集分析,主要富集在环境信息处理、细胞过程、人类疾病、有机体系统几方面。通过蛋白互作分析筛选出核心基因10个,分别为IL-6、IL-1β、CCL2、Mmp9、Spp1、ItgamCdc20、Ccna2、Kif11、Ccnb2。对差异基因进行荧光定量PCR试验,验证转录组结果可信,根据筛选出的DEGs和RT-qPCR结果,推测SPP1是Rv3435c行使功能的潜在靶点,并通过RT-qPCR、ELISA、Western blot验证结果。本文为结核分枝杆菌Rv3435c基因的功能探索提供了重要的数据支持。

关键词: 结核分枝杆菌, Rv3435c基因, 耻垢分枝杆菌, 基因注释, 转录组

Abstract: Previous studies have found that Mycobacterium smegmatis, which heterogeneically expresses the Rv3435c gene, can significantly inhibit the inflammatory expression of macrophages. In order to explore the function of Rv3435c gene in this process, second-generation sequencing was used to analyze the transcriptome differences of RAW264.7 cells infected by Rv3435c recombinant Mycobacterium smegmatis. Results were as follows: The mRNA expression levels of IL-1β, TNF-α and IL-6 at 6, 12, 24 and 48 h were detected by RT-qPCR, and 12 h with the highest expression levels was selected as the transcriptomic sequencing time point. The original data obtained by sequencing were analyzed for data quality and compared with the result statistics, and the data quality was confirmed to be good. The sample relationship analysis suggested that Rv3435c significantly changed the gene expression of mouse macrophages. A total of 14 077 differential genes were obtained by filtering and comparing the data, of which 278 were significantly up-regulated and 118 were significantly down-regulated. The differential genes obtained by GO annotation are mainly concentrated in immune system process, response to external stimulus, defense response and so on. KEGG pathway enrichment analysis was carried out for differential genes, mainly concentrated in environmental information processing, cellular processes, human diseases, and organic systems. Ten core genes were identified by protein interaction analysis, which were IL-6, IL-1β, CCL2, Mmp9, Spp1, Itgam, Cdc20, Ccna2, Kif11 and Ccnb2. Fluorescent quantitative PCR experiments were performed on the differential genes to verify the reliability of the transcriptome results. According to the selected DEGs and RT-qPCR results, we speculated that SPP1 was a potential target for the function of Rv3435c, and the results were verified by RT-qPCR, ELISA and Western blot. This study provides important data support for the function exploration of Rv3435c gene of Mycobacterium tuberculosis.

Key words: Mycobacterium tuberculosis, Rv3435c gene, Mycobacterium smegmatis, gene annotation, transcriptome

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