CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES ›› 2023, Vol. 41 ›› Issue (6): 683-690.doi: 10.12140/j.issn.1000-7423.2023.06.004

• ORIGINAL ARTICLES • Previous Articles     Next Articles

Identification and analysis of miRNA targeting CYP450s genes in mosquitoes

WU Jiahui1(), SONG Xiao1,2, CHENG Peng1, LIU Hongmei1, GUO Xiuxia1, WANG Haifang1, GONG Maoqing1,*()   

  1. 1 Shandong Institute of Parasitic Diseases, Shandong First Medical University & Shandong Academy of Medical Sciences, Jining 272033, China
    2 Liaocheng Brain Hospital, Liaocheng 252000, Shandong, China
  • Received:2023-03-31 Online:2023-12-30 Published:2023-12-28
  • Contact: * E-mail: mqgong@sdfmu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(81672059);National Natural Science Foundation of China(81871685)

Abstract:

Objective To screen and identify the microRNAs (miRNAs) targeting cytochrome P450 enzymes (CYP450s) genes in mosquitoes, and analyze the differentially expressed miRNAs and the function of their target genes. Methods Ten larvae of each cypermethrin-susceptible (CS) and cypermethrin-resistant (CR) line Culex pipiens pallens mosquitoes and 5 blood-unfed female adult mosquitoes of each line on 3 d post-emergence were collected for extracting total RNA followed by sequencing, to calculate the differential expression between CS and CR lines using DEGseq software. MiRanda and RNAhybrid databases were used to screen the target genes of differentially expressed miRNAs, and gene ontology (GO) and kyoto encyclopedia of genes and genomes (KEGG) enrichment analysis was performed. Five differentially expressed miRNAs (miR-11-5p, miR-317_3, miR-278-3p_1, miR-8-5p and miR-305-3p_5) that may regulate the expression of CYP450s genes were selected for real-time quantitative PCR (qRT-PCR) to validate the sequence output. The relative expression level of differentially expressed miRNAs target genes (CYP6a8, CYP6BB1v2, CYP6N22, CYP6N26P, CYP9b2) were detected by qRT-PCR. Results A total of 196 miRNAs were differentially expressed between CS and CR line Culex pipiens pallens. Among them, 16.3% (32/196) were differentially expressed in age Ⅲ larvae, 20.4% (40/196) in age Ⅳ larvae and 26.0% (51/196) in female adult mosquitoes exclusively; 12.2% (24/196) were differentially expressed in all stages. 45 were up-regulated and 46 were down-regulated of 91 miRNAs differentially expressed at age Ⅲ larvae. 59 were up-regulated and 45 were down-regulated of 104 miRNAs differentially expressed at age Ⅳ larvae. 44 were up-regulated and 54 were down-regulated of 98 miRNAs differentially expressed at female adult mosquitoes. The results of the GO and KEGG enrichment analysis showed that the target genes of differentially expressed miRNAs were mainly related to cellular, metabolic and single-cell biological pathways. The molecular functions of target genes were mainly involve with binding, catalytic activity and transporter activity. The target genes were mainly enriched in the pathways related to signal transduction, infectious diseases, cancers and parasitic diseases. The qRT-PCR results showed that the trends of 5 differentially expressed miRNAs were basically consistent with the sequencing results; The expression profiles of 5 miRNAs were opposite to the target genes (CYP6a8, CYP6BB1v2, CYP6N22, CYP6N26P and CYP9b2). Conclusion The five differentially expressed miRNAs screened in this study (miR-11-5p, miR-317_3, miR-278-3p_1, miR-8-5p and miR-305-3p_5) could regulate the insecticide resistance of Culex pipiens pallens by modulating the expression of CYP450s.

Key words: Culex pipiens pallens, Cypermethrin, miRNA, Insecticide resistance, High-throughput sequencing

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