scholarly journals Ecological studies on overwintering populations of Culex pipiens pallens : 1. Wing-length distribution and R-ratio of the overwintering females from various latitudes of Japan

1981 ◽  
Vol 32 (2) ◽  
pp. 95-104 ◽  
Author(s):  
Kiyoshi MAKIYA
Keyword(s):  
Culex Pipiens ◽  
Wing Length ◽  
Length Distribution ◽  
Ecological Studies ◽  
Culex Pipiens Pallens ◽  
R Ratio ◽  
Pipiens Pallens

scholarly journals Ecological studies of the overwintering mosquito, Culex pipiens pallens in the urban district of Japan

2005 ◽  
Vol 56 (Supplement) ◽  
pp. 49
Author(s):  
M Kobayashi ◽  
S Kasai ◽  
H Isawa ◽  
T Hayashi ◽  
N Nihei ◽  
...  
Keyword(s):  
Culex Pipiens ◽  
Ecological Studies ◽  
Culex Pipiens Pallens ◽  
Urban District ◽  
Pipiens Pallens

scholarly journals MiR-4448 is involved in deltamethrin resistance by targeting CYP4H31 in Culex pipiens pallens

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Xixi Li ◽  
Shengli Hu ◽  
Haitao Yin ◽  
Hongbo Zhang ◽  
Dan Zhou ◽  
...  
Keyword(s):  
Culex Pipiens ◽  
Oral Feeding ◽  
Cell Counting ◽  
Luciferase Reporter ◽  
Culex Pipiens Pallens ◽  
Deltamethrin Resistance ◽  
Regulatory Functions ◽  
Pipiens Pallens

Abstract Background Culex pipiens (Cx. pipiens) complex, which acts as a vector of viruses and is widespread and abundant worldwide, including West Nile virus, Japanese encephalitis virus, and Sindbis virus, can cause serious vector-borne diseases affecting human health. Unfortunately, mosquitoes have developed deltamethrin resistance because of its long-term overuse, representing a major challenge to mosquito control. Understanding the molecular regulatory mechanisms of resistance is vital to control mosquitoes. MicroRNAs (miRNAs) are short non-coding RNAs that have been demonstrated to be important regulators of gene expression across a wide variety of organisms, which might function in mosquito deltamethrin resistance. In the present study, we aimed to investigate the regulatory functions of miR-4448 and CYP4H31 in the formation of insecticidal resistance in mosquito Culex pipiens pallens. Methods We used quantitative real-time reverse transcription PCR to measure miR-4448 and CYP4H31 (encoding a cytochrome P450) expression levels. The regulatory functions of miR-4448 and CYP4H31 were assessed using dual-luciferase reporter assays. Then, oral feeding, RNA interference, and the American Centers for Disease Control and Prevention bottle bioassay were used to determine miR-4448’s association with deltamethrin resistance by targeting CYP4H31in vivo. Cell Counting Kit-8 (CCK-8) was also used to detect the viability of pIB/V5-His-CYP4H31-transfected C6/36 cells after deltamethrin treatment in vitro. Results MiR-4448 was downregulated in the deltamethrin-resistant strain (DR strain), whereas CYP4H31 was downregulated in deltamethrin-susceptible strain. CYP4H31 expression was downregulated by miR-4448 recognizing and binding to its 3′ untranslated region. Functional verification experiments showed that miR-4448 overexpression resulted in lower expression of CYP4H31. The mortality of miR-4448 mimic-injected DR strain mosquitoes was higher than that of the controls. CCK-8 assays showed that CYP4H31 decreased cellular resistance to deltamethrin in vitro and the mortality of the DR strain increased when CYP4H31 was knocked down in vivo. Conclusions In mosquitoes, miR-4448 participates in deltamethrin resistance by targeting CYP4H31. The results of the present study increase our understanding of deltamethrin resistance mechanisms.

Feeding on different attractive flowering plants affects the energy reserves of Culex pipiens pallens adults

2017 ◽  
Vol 117 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Bao-Ting Yu ◽  
Yin Hu ◽  
Yan-Mei Ding ◽  
Jia-Xin Tian ◽  
Jian-Chu Mo
Keyword(s):  
Culex Pipiens ◽  
Flowering Plants ◽  
Energy Reserves ◽  
Culex Pipiens Pallens ◽  
Pipiens Pallens
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