Author
E. D. Tanaka
Other affiliations: University of São Paulo, Pompeu Fabra University
Bio: E. D. Tanaka is an academic researcher from Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto. The author has contributed to research in topics: Stingless bee & Honey bee life cycle. The author has an hindex of 5, co-authored 19 publications receiving 417 citations. Previous affiliations of E. D. Tanaka include University of São Paulo & Pompeu Fabra University.
Papers
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Utah State University1, University of Illinois at Urbana–Champaign2, University of Copenhagen3, Johns Hopkins University School of Medicine4, Johns Hopkins University5, University of Chicago6, Hobart and William Smith Colleges7, University of Utah8, United States Department of Agriculture9, Autonomous University of Barcelona10, Swiss Institute of Bioinformatics11, University of Geneva12, Martin Luther University of Halle-Wittenberg13, Queen Mary University of London14, Georgia Institute of Technology15, University of Georgia16, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto17, Sao Paulo State University18, Federal University of São Carlos19, University of São Paulo20, Agricultural Research Service21, East Carolina University22, Ohio Agricultural Research and Development Center23, University of Michigan24, University of Hohenheim25, York University26, Janelia Farm Research Campus27, Texas A&M University28, Harvard University29
TL;DR: There is no single road map to eusociality; independent evolutionary transitions in sociality have independent genetic underpinnings and these transitions do have similar general features, including an increase in constrained protein evolution accompanied by increases in the potential for gene regulation and decreases in diversity and abundance of transposable elements.
Abstract: The evolution of eusociality is one of the major transitions in evolution, but the underlying genomic changes are unknown We compared the genomes of 10 bee species that vary in social complexity, representing multiple independent transitions in social evolution, and report three major findings First, many important genes show evidence of neutral evolution as a consequence of relaxed selection with increasing social complexity Second, there is no single road map to eusociality; independent evolutionary transitions in sociality have independent genetic underpinnings Third, though clearly independent in detail, these transitions do have similar general features, including an increase in constrained protein evolution accompanied by increases in the potential for gene regulation and decreases in diversity and abundance of transposable elements Eusociality may arise through different mechanisms each time, but would likely always involve an increase in the complexity of gene networks
325 citations
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TL;DR: In ovaries the expression levels of the two honey bee LDLR members showed opposing trends: whereas Amvgr expression was upregulated as the ovaries became activated, Amlpr transcript levels gradually declined, corroborated the qPCR results showing an increase in AmVgr gene expression concomitant with follicle growth.
63 citations
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TL;DR: This work studies miRNA function in the most primitive, panoistic type of ovaries using the phylogenetically basal insect Blattella germanica (Dictyoptera, Blattellidae) as model.
28 citations
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TL;DR: The overall similarities in oogenesis between the two taxa suggest that the decision to form trophic eggs should only occur in the late stages of oogenesis.
Abstract: The high variability in the reproductive biology of stingless bees makes them very amenable for comparative studies with other eusocial bee taxa. We investigated the structural organization of the ovaries of Melipona quadrifasciata queens and workers kept under different social conditions by analyzing their general histology, mitotic activity, and microfilament organization. The overall dynamics of ovarian activity were similar in the two castes, and at emergence their ovarioles contained a previtellogenic follicle. Stingless bees and honey bees differ in the structural organization in the lower germarium, but they have in common synchronized mitotic activity and putative germ line stem cells in the terminal filament. Unlike honey bees, stingless bee workers lay trophic eggs in addition to reproductive eggs. The overall similarities in oogenesis between the two taxa suggest that the decision to form trophic eggs should only occur in the late stages of oogenesis.
13 citations
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TL;DR: The sequence of vasa, a highly conserved gene specific to the germ line of metazoans, is determined for the honey bee and four stingless bees and by RT-PCR it is confirmed that germ line specificity of Amvasa expression in honey bees is confirmed.
Abstract: Queens and workers of social insects differ in the rates of egg laying. Using genomic information we determined the sequence of vasa, a highly conserved gene specific to the germ line of metazoans, for the honey bee and four stingless bees. The vasa sequence of social bees differed from that of other insects in two motifs. By RT-PCR we confirmed the germ line specificity of Amvasa expression in honey bees. In situ hybridization on ovarioles showed that Amvasa is expressed throughout the germarium, except for the transition zone beneath the terminal filament. A diffuse vasa signal was also seen in terminal filaments suggesting the presence of germ line cells. Oocytes showed elevated levels of Amvasa transcripts in the lower germarium and after follicles became segregated. In previtellogenic follicles, Amvasa transcription was detected in the trophocytes, which appear to supply its mRNA to the growing oocyte. A similar picture was obtained for ovarioles of the stingless bee Melipona quadrifasciata, except that Amvasa expression was higher in the oocytes of previtellogenic follicles. The social bees differ in this respect from Drosophila, the model system for insect oogenesis, suggesting that changes in the sequence and expression pattern of vasa may have occurred during social evolution.
13 citations
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28 Jul 2005
TL;DR: PfPMP1)与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作�ly.
Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1(PfPMP1)与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员,通过启动转录不同的var基因变异体为抗原变异提供了分子基础。
18,940 citations
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854 citations
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TL;DR: It’s time to get used to the idea that there is no such thing as a safe place to die.
Abstract: 它是美国国立医学图书馆(NLM)生产的国际性生物医学文献联机书目数据库,是美国国立医学图书馆MEDLARS系统30多个数据库中最大的一个数据库,是世界上最著名的生物医学数据库之一。其内容相当于3种印刷本检索刊物:《医学索引》(index medicus,IM)、《牙科文献索引》、《国际护理学索引》,收录了1966年以来的70多个国家4300多种期刊的题录和文摘共1100万条记录,
678 citations
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TL;DR: The biological features that make stingless bees strong candidates for commercial pollination services are discussed, together with their present limitations, and the effects of natural vegetation and wild bees on crop yield are reviewed, and make a strong case for habitat conservation.
Abstract: At present, numbers of both wild and managed bee colonies are declining rapidly, causing global concern for pollination services. Stingless bees play an important ecological role as pollinators of many wild plant species and seem good candidates for future alternatives in commercial pollination. This paper reviews the effectiveness of stingless bees as crop pollinators. Over the past six years the number of crops reported to be effectively pollinated by stingless bees has doubled, putting the total figure on 18 crops. Eleven stingless bee species across six genera have been found to forage effectively under enclosed condi- tions, indicating the potential of stingless bees as pollinators of greenhouse crops. The biological features that make stingless bees strong candidates for commercial pollination services are discussed, together with their present limitations. The effects of natural vegetation and wild bees on crop yield are reviewed, and make a strong case for habitat conservation. agriculture / alternative pollinators / food crop / greenhouse / Meliponini
364 citations
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TL;DR: There is unequivocal evidence that ants are the sister group to bees+apoid wasps (Apoidea) and that bees are nested within a paraphyletic Crabronidae, and that taxon choice can fundamentally impact tree topology and clade support in phylogenomic inference.
289 citations