Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (9): 4657-4672.doi: 10.11843/j.issn.0366-6964.2025.09.043

• Basic Veterinary Medicine • Previous Articles     Next Articles

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 Online:2025-09-23 Published:2025-09-30
  • Contact: ZENG Fanli, DU Rui E-mail:2892144827@qq.com;zengfanli@jlau.edu.cn;durui@jlau.edu.cn

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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