Journal of Microbiology

Review

Advancements in dengue vaccines: A historical overview and pro-spects for following next-generation candidates: Kai Yan, Lingjing Mao, Jiaming Lan, Zhongdang Xiao; J. Microbiol. 2025;63(2):e2410018. Published online February 27, 2025; DOI: https://doi.org/10.71150/jm.2410018

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Abstract PDF: Dengue, caused by four serotypes of dengue viruses (DENV-1 to DENV-4), is the most prevalent and widely mosquito-borne viral disease affecting humans. Dengue virus (DENV) infection has been reported in over 100 countries, and approximately half of the world's population is now at risk. The paucity of universally licensed DENV vaccines highlights the urgent need to address this public health concern. Action and atten-tion to antibody-dependent enhancement increase the difficulty of vaccine development. With the worsen-ing dengue fever epidemic, Dengvaxia® (CYD-TDV) and Qdenga® (TAK-003) have been approved for use in specific populations in affected areas. However, these vaccines do not provide a balanced immune response to all four DENV serotypes and the vaccination cannot cover all populations. There is still a need to develop a safe, broad-spectrum, and effective vaccine to address the increasing number of dengue cases worldwide. This review provides an overview of the existing DENV vaccines, as well as potential candidates for future studies on DENV vaccine development, and discusses the challenges and possible solutions in the field.

Journal Article

H2 Metabolism revealed by metagenomic analysis of subglacial sediment from East Antarctica: Zhifeng Yang , Yu Zhang , Yongxin Lv , Wenkai Yan , Xiang Xiao , Bo Sun , Hongmei Ma; J. Microbiol. 2019;57(12):1095-1104. Published online November 22, 2019; DOI: https://doi.org/10.1007/s12275-019-9366-2

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Subglacial ecosystems harbor diverse chemoautotrophic microbial communities in areas with limited organic carbon, and lithological H2 produced during glacial erosion has been considered an important energy source in these ecosystems. To verify the H2-utilizing potential there and to identify the related energy-converting metabolic mechanisms of these communities, we performed metagenomic analysis on subglacial sediment samples from East Antarctica with and without H2 supplementation. Genes coding for several [NiFe]- hydrogenases were identified in raw sediment and were enriched after H2 incubation. All genes in the dissimilatory nitrate reduction and denitrification pathways were detected in the subglacial community, and the genes coding for these pathways became enriched after H2 was supplied. Similarly, genes transcribing key enzymes in the Calvin cycle were detected in raw sediment and were also enriched. Moreover, key genes involved in H2 oxidization, nitrate reduction, oxidative phosphorylation, and the Calvin cycle were identified within one metagenome-assembled genome belonging to a Polaromonas sp. As suggested by our results, the microbial community in the subglacial environment we investigated consisted of chemoautotrophic populations supported by H2 oxidation. These results further confirm the importance of H2 in the cryosphere.

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