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Published on: March 25, 2015
miRNA genes of an invasive vector mosquito, Aedes albopictus
Jinbao Gu1, Wanqi Hu, Jinya Wu
1Key Laboratory of Prevention and Control of Emerging Infectious Diseases of Guangdong Higher Education Institutes, Department of Pathogen Biology, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong, P.R. China.
Abstract:
Aedes albopictus, a vector of Dengue and Chikungunya viruses, is a robust invasive species in both tropical and temperate environments. MicroRNAs (miRNAs) regulate gene expression and biological processes including embryonic development, innate immunity and infection. While a number of miRNAs have been discovered in some mosquitoes, no comprehensive effort has been made to characterize them from different developmental stages from a single species. Systematic analysis of miRNAs in Ae. albopictus will improve our understanding of its basic biology and inform novel strategies to prevent virus transmission. Between 10-14 million Illumina sequencing reads per sample were obtained from embryos, larvae, pupae, adult males, sugar-fed and blood-fed adult females. A total of 119 miRNA genes represented by 215 miRNA or miRNA star (miRNA*) sequences were identified, 15 of which are novel. Eleven, two, and two of the newly-discovered miRNA genes appear specific to Aedes, Culicinae, and Culicidae, respectively. A number of miRNAs accumulate predominantly in one or two developmental stages and the large number that showed differences in abundance following a blood meal likely are important in blood-induced mosquito biology. Gene Ontology (GO) analysis of the targets of all Ae. albopictus miRNAs provides a useful starting point for the study of their functions in mosquitoes. This study is the first systematic analysis of miRNAs based on deep-sequencing of small RNA samples of all developmental stages of a mosquito species. A number of miRNAs are related to specific physiological states, most notably, pre- and post-blood feeding. The distribution of lineage-specific miRNAs is consistent with mosquito phylogeny and the presence of a number of Aedes-specific miRNAs likely reflects the divergence between the Aedes and Culex genera.
Insights
This study comprehensively analyzes microRNAs (miRNAs) across all life stages of the invasive Aedes albopictus mosquito. It identifies novel miRNAs and reveals stage-specific expression patterns crucial for mosquito biology and virus transmission.
Area of Science:
- * Molecular Biology
- * Genomics
- * Vector Biology
Background:
- * Aedes albopictus mosquitoes transmit Dengue and Chikungunya viruses globally.
- * MicroRNAs (miRNAs) are key regulators of gene expression in insects, influencing development, immunity, and infection.
- * Previous research lacked a comprehensive characterization of miRNAs across all developmental stages of a single mosquito species.
Purpose of the Study:
- * To systematically identify and characterize microRNAs (miRNAs) in Aedes albopictus across all developmental stages.
- * To investigate the differential expression of miRNAs in response to physiological changes, such as blood feeding.
- * To provide a foundation for understanding miRNA function in mosquito biology and developing novel vector control strategies.
Main Methods:
- * Deep sequencing of small RNA libraries from Aedes albopictus embryos, larvae, pupae, adult males, and sugar-fed/blood-fed females.
- * Bioinformatic analysis to identify known and novel miRNA genes and their star sequences (miRNA*).
- * Gene Ontology (GO) analysis to predict the functional roles of identified miRNA targets.
Main Results:
- * Identification of 119 miRNA genes, including 15 novel miRNAs, with some exhibiting lineage specificity (Aedes, Culicinae, Culicidae).
- * Discovery of stage-specific miRNA accumulation and significant changes in miRNA abundance post-blood meal, indicating roles in blood-feeding physiology.
- * Gene Ontology analysis of predicted targets offers insights into the functional significance of miRNAs in mosquito development and immunity.
Conclusions:
- * This is the first systematic deep-sequencing analysis of miRNAs across all developmental stages of Aedes albopictus.
- * The identified miRNAs, particularly those differentially expressed after blood feeding, are crucial for understanding mosquito physiology and vector competence.
- * The findings provide a valuable resource for future research on mosquito biology and the development of innovative strategies to control arbovirus transmission.
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