scholarly journals Multiple large-scale gene and genome duplications during the evolution of hexapods

2018 ◽  
Author(s):  
Zheng Li ◽  
George P. Tiley ◽  
Sally R. Galuska ◽  
Chris R. Reardon ◽  
Thomas I. Kidder ◽  
...  
Keyword(s):  
Gene Duplication ◽  
Large Scale ◽  
Plant Evolution ◽  
Minor Role ◽  
Animal Evolution ◽  
Gene Retention ◽  
Insect Phylogeny ◽  
Genome Duplications ◽  
History Of ◽  
Gene Age

AbstractPolyploidy or whole genome duplication (WGD) is a major contributor to genome evolution and diversity. Although polyploidy is recognized as an important component of plant evolution, it is generally considered to play a relatively minor role in animal evolution. Ancient polyploidy is found in the ancestry of some animals, especially fishes, but there is little evidence for ancient WGDs in other metazoan lineages. Here we use recently published transcriptomes and genomes from more than 150 species across the insect phylogeny to investigate whether ancient WGDs occurred during the evolution of Hexapoda, the most diverse clade of animals. Using gene age distributions and phylogenomics, we found evidence for 18 ancient WGDs and six other large-scale bursts of gene duplication during insect evolution. These bursts of gene duplication occurred in the history of lineages such as the Lepidoptera, Trichoptera, and Odonata. To further corroborate the nature of these duplications, we evaluated the pattern of gene retention from putative WGDs observed in the gene age distributions. We found a relatively strong signal of convergent gene retention across many of the putative insect WGDs. Considering the phylogenetic breadth and depth of the insect phylogeny, this observation is consistent with polyploidy as we expect dosage-balance to drive the parallel retention of genes. Together with recent research on plant evolution, our hexapod results suggest that genome duplications contributed to the evolution of two of the most diverse lineages of eukaryotes on Earth.

scholarly journals Multiple large-scale gene and genome duplications during the evolution of hexapods

2018 ◽  
Vol 115 (18) ◽  
pp. 4713-4718 ◽  
Author(s):  
Zheng Li ◽  
George P. Tiley ◽  
Sally R. Galuska ◽  
Chris R. Reardon ◽  
Thomas I. Kidder ◽  
...  
Keyword(s):  
Gene Duplication ◽  
Large Scale ◽  
Plant Evolution ◽  
Minor Role ◽  
Animal Evolution ◽  
Gene Retention ◽  
Insect Phylogeny ◽  
Genome Duplications ◽  
History Of ◽  
Gene Age

Polyploidy or whole genome duplication (WGD) is a major contributor to genome evolution and diversity. Although polyploidy is recognized as an important component of plant evolution, it is generally considered to play a relatively minor role in animal evolution. Ancient polyploidy is found in the ancestry of some animals, especially fishes, but there is little evidence for ancient WGDs in other metazoan lineages. Here we use recently published transcriptomes and genomes from more than 150 species across the insect phylogeny to investigate whether ancient WGDs occurred during the evolution of Hexapoda, the most diverse clade of animals. Using gene age distributions and phylogenomics, we found evidence for 18 ancient WGDs and six other large-scale bursts of gene duplication during insect evolution. These bursts of gene duplication occurred in the history of lineages such as the Lepidoptera, Trichoptera, and Odonata. To further corroborate the nature of these duplications, we evaluated the pattern of gene retention from putative WGDs observed in the gene age distributions. We found a relatively strong signal of convergent gene retention across many of the putative insect WGDs. Considering the phylogenetic breadth and depth of the insect phylogeny, this observation is consistent with polyploidy as we expect dosage balance to drive the parallel retention of genes. Together with recent research on plant evolution, our hexapod results suggest that genome duplications contributed to the evolution of two of the most diverse lineages of eukaryotes on Earth.

scholarly journals The Power of Shop Culture

1992 ◽  
Vol 37 (3) ◽  
pp. 350-375 ◽  
Author(s):  
Erik Olssen ◽  
Jeremy Brecher
Keyword(s):  
Social Relations ◽  
Large Scale ◽  
Scientific Management ◽  
The Political ◽  
Minor Role ◽  
Skilled Workers ◽  
Labour Process ◽  
History Of ◽  
Hiring And Firing ◽  
A Minor

SummaryThis paper investigates the history of the labour process in New Zealand's state-owned railway workshops and questions the idea that large-scale industry inevitably destroyed whatever agency skilled workers had enjoyed. It also shows that relations of production vary with the political and cultural contexts. Craft control of the labour process survived in New Zealand's state-owned railway workshops and the union played only a minor role. Jop control was more important in achieving bureaucratic instead of autocratic control over such matters as hiring and firing; the retention of apprentice-based crafts; the institutionalization of seniority; and in resisting both de-skilling and the “premium bonus”. The strength and vitality of shop culture, based on craft control of the labour process, also survived and modified the Government's vigorous attempt to introduce “scientific management”. In brief the article concludes that productive processes do not inevitably determine social relations of production, that capitalism has been neither homogeneous nor uniform, and that mechanization never inevitably results in de-skilling.

scholarly journals Degree of Functional Divergence in Duplicates Is Associated with Distinct Roles in Plant Evolution

2020 ◽  
Author(s):  
Akihiro Ezoe ◽  
Kazumasa Shirai ◽  
Kousuke Hanada
Keyword(s):  
Gene Duplication ◽  
Related Species ◽  
Plant Evolution ◽  
Whole Genome ◽  
Duplicated Genes ◽  
Closely Related Species ◽  
Whole Genome Duplications ◽  
New Genes ◽  
Genome Duplications ◽  
Tandem Duplications

Abstract Gene duplication is a major mechanism to create new genes. After gene duplication, some duplicated genes undergo functionalization, whereas others largely maintain redundant functions. Duplicated genes comprise various degrees of functional diversification in plants. However, the evolutionary fate of high and low diversified duplicates is unclear at genomic scale. To infer high and low diversified duplicates in Arabidopsis thaliana genome, we generated a prediction method for predicting whether a pair of duplicate genes was subjected to high or low diversification based on the phenotypes of knock-out mutants. Among 4,017 pairs of recently duplicated A. thaliana genes, 1,052 and 600 are high and low diversified duplicate pairs, respectively. The predictions were validated based on the phenotypes of generated knock-down transgenic plants. We determined that the high diversified duplicates resulting from tandem duplications tend to have lineage-specific functions, whereas the low diversified duplicates produced by whole-genome duplications are related to essential signaling pathways. To assess the evolutionary impact of high and low diversified duplicates in closely related species, we compared the retention rates and selection pressures on the orthologs of A. thaliana duplicates in two closely related species. Interestingly, high diversified duplicates resulting from tandem duplications tend to be retained in multiple lineages under positive selection. Low diversified duplicates by whole-genome duplications tend to be retained in multiple lineages under purifying selection. Taken together, the functional diversities determined by different duplication mechanisms had distinct effects on plant evolution.

scholarly journals Economics and politics of the great change: Mikhail Gorbachev versus Deng Xiaoping

2021 ◽  
Vol 2021 (01) ◽  
pp. 5-19
Author(s):  
Grzegorz W. Kolodko ◽  
Keyword(s):  
Large Scale ◽  
Minor Role ◽  
Deng Xiaoping ◽  
Mikhail Gorbachev ◽  
Political Liberalization ◽  
Economic Relations ◽  
History Of ◽  
World Economic ◽  
Previous State ◽  
A Minor

In the history of mankind, there has never been a case where, in a brief episode of the life of one generation, mutual economic relations have changed on such a large scale for so many people as they did in China and Russia in 1989-2020. Both countries are undergoing profound structural and institutional changes, but while the former recorded impressive results in terms of developing and catching up with advanced economies, the latter’s achievements have been very modest. While China has multiplied production to become a world economic power, Russia's economy has grown modestly and plays a minor role in the globalization process. In just a few years, the level of production and the standard of living of the Chinese population will first equalize and then exceed the level achieved by Russia. This happened due to many factors – from the traditional cultural heritage to geopolitical conditions, from the legacy from the previous state socialism to different natural resources bases – however, the nature and duration of the political leadership of Deng Xiaoping in China and Mikhail Gorbachev in Russia were of fundamental importance. Without taking into account the influence of the thoughts and actions of these two statesmen, it is impossible to understand the essence of tectonic changes that have occurred in the world economy recently. While Deng Xiaoping prioritized pro-growth-oriented economic reforms, while doing little in the realm of political liberalization, Mikhail Gorbachev attempted to combine political and economic liberalization, but failed to do so. The effects of decisions made several decades ago are still felt today. Evidently, Deng Xiaoping's approach proved to be more effective than Gorbachev's reforms. In the latter case, they took Russia and other post-Soviet republics in a completely different direction than that assumed by their architect.

scholarly journals Tangled up in two: a burst of genome duplications at the end of the Cretaceous and the consequences for plant evolution

2014 ◽  
Vol 369 (1648) ◽  
pp. 20130353 ◽  
Author(s):  
Kevin Vanneste ◽  
Steven Maere ◽  
Yves Van de Peer
Keyword(s):  
Large Scale ◽  
Plant Evolution ◽  
Small Scale ◽  
Whole Genome ◽  
Polyploid Species ◽  
Plant Genomes ◽  
Whole Genome Duplications ◽  
Genome Duplications ◽  
Duplication Events ◽  
Biological Innovations

Genome sequencing has demonstrated that besides frequent small-scale duplications, large-scale duplication events such as whole genome duplications (WGDs) are found on many branches of the evolutionary tree of life. Especially in the plant lineage, there is evidence for recurrent WGDs, and the ancestor of all angiosperms was in fact most likely a polyploid species. The number of WGDs found in sequenced plant genomes allows us to investigate questions about the roles of WGDs that were hitherto impossible to address. An intriguing observation is that many plant WGDs seem associated with periods of increased environmental stress and/or fluctuations, a trend that is evident for both present-day polyploids and palaeopolyploids formed around the Cretaceous–Palaeogene (K–Pg) extinction at 66 Ma. Here, we revisit the WGDs in plants that mark the K–Pg boundary, and discuss some specific examples of biological innovations and/or diversifications that may be linked to these WGDs. We review evidence for the processes that could have contributed to increased polyploid establishment at the K–Pg boundary, and discuss the implications on subsequent plant evolution in the Cenozoic.

scholarly journals The Evolutionary and Functional Paradox of Cerato-platanins in Fungi

2020 ◽  
Vol 86 (13) ◽  
Author(s):  
Renwei Gao ◽  
Mingyue Ding ◽  
Siqi Jiang ◽  
Zheng Zhao ◽  
Komal Chenthamara ◽  
...  
Keyword(s):  
Natural Selection ◽  
Gene Duplication ◽  
Evolutionary History ◽  
Minor Role ◽  
Evolutionary Analysis ◽  
Biochemical Tests ◽  
Content Type ◽  
Small Proteins ◽  
Functional Genomic Analysis ◽  
History Of

ABSTRACT Cerato-platanins (CPs) form a family of fungal small secreted cysteine-rich proteins (SSCPs) and are of particular interest not only because of their surface activity but also their abundant secretion by fungi. We performed an evolutionary analysis of 283 CPs from 157 fungal genomes with the focus on the environmental opportunistic plant-beneficial and mycoparasitic fungus Trichoderma. Our results revealed a long evolutionary history of CPs in Dikarya fungi that have undergone several events of lateral gene transfer and gene duplication. Three genes were maintained in the core genome of Trichoderma, while some species have up to four CP-encoding genes. All Trichoderma CPs evolve under stabilizing natural selection pressure. The functional genomic analysis of CPs in Trichoderma guizhouense and Trichoderma harzianum revealed that only epl1 is active at all stages of development but that it plays a minor role in interactions with other fungi and bacteria. The deletion of this gene results in increased colonization of tomato roots by Trichoderma spp. Similarly, biochemical tests of EPL1 heterologously produced by Pichia pastoris support the claims described above. Based on the results obtained, we conclude that the function of CPs is probably linked to their surfactant properties and the ability to modify the hyphosphere of submerged mycelia and, thus, facilitate the nutritional versatility of fungi. The effector-like functions do not sufficiently describe the diversity and evolution of these proteins in fungi, as they are also maintained, duplicated, or laterally transferred in the genomes of nonherbivore fungi. IMPORTANCE Cerato-platanins (CPs) are surface-active small proteins abundantly secreted by filamentous fungi. Consequently, immune systems of plants and other organisms recognize CPs and activate defense mechanisms. Some CPs are toxic to plants and act as virulence factors in plant-pathogenic fungi. Our analysis, however, demonstrates that the interactions with plants do not explain the origin and evolution of CPs in the fungal kingdom. We revealed a long evolutionary history of CPs with multiple cases of gene duplication and events of interfungal lateral gene transfers. In the mycoparasitic Trichoderma spp., CPs evolve under stabilizing natural selection and hamper the colonization of roots. We propose that the ability to modify the hydrophobicity of the fungal hyphosphere is a key to unlock the evolutionary and functional paradox of these proteins.

Materials for the history of the gospel-Baptist movement in Ukraine

1996 ◽  
pp. 4-15
Author(s):  
S. Golovaschenko ◽  
Petro Kosuha
Keyword(s):  
Large Scale ◽  
Religious Studies ◽  
Theological Seminary ◽  
National Academy Of Sciences ◽  
Evangelical Christians ◽  
Evangelical Christian ◽  
First Results ◽  
History Of ◽  
Fruitful Cooperation ◽  
Academy Of Sciences

The report is based on the first results of the study "The History of the Evangelical Christians-Baptists in Ukraine", carried out in 1994-1996 by the joint efforts of the Department of Religious Studies at the Institute of Philosophy of the National Academy of Sciences of Ukraine and the Odessa Theological Seminary of Evangelical Christian Baptists. A large-scale description and research of archival sources on the history of evangelical movements in our country gave the first experience of fruitful cooperation between secular and church researchers.

Integration of Ecological and Engineering Aspects in Planning Large Scale Tidal Power Development in the Bay of Fundy, Canada

1984 ◽  
Vol 16 (1-2) ◽  
pp. 281-295 ◽  
Author(s):  
Donald C Gordon
Keyword(s):  
Large Scale ◽  
Feasibility Studies ◽  
Bay Of Fundy ◽  
Final Decision ◽  
Power Development ◽  
Tidal Power ◽  
History Of ◽  
Scientists And Engineers ◽  
The Many ◽  
University Scientists

Large-scale tidal power development in the Bay of Fundy has been given serious consideration for over 60 years. There has been a long history of productive interaction between environmental scientists and engineers durinn the many feasibility studies undertaken. Up until recently, tidal power proposals were dropped on economic grounds. However, large-scale development in the upper reaches of the Bay of Fundy now appears to be economically viable and a pre-commitment design program is highly likely in the near future. A large number of basic scientific research studies have been and are being conducted by government and university scientists. Likely environmental impacts have been examined by scientists and engineers together in a preliminary fashion on several occasions. A full environmental assessment will be conducted before a final decision is made and the results will definately influence the outcome.

scholarly journals A Survey on Edge Performance Benchmarking

2021 ◽  
Vol 54 (3) ◽  
pp. 1-33
Author(s):  
Blesson Varghese ◽  
Nan Wang ◽  
David Bermbach ◽  
Cheol-Ho Hong ◽  
Eyal De Lara ◽  
...  
Keyword(s):  
Large Scale ◽  
Future Internet ◽  
Coupled Systems ◽  
Operational Conditions ◽  
Loosely Coupled ◽  
Performance Benchmarking ◽  
The Past ◽  
Geographically Dispersed ◽  
Tightly Coupled ◽  
History Of

Edge computing is the next Internet frontier that will leverage computing resources located near users, sensors, and data stores to provide more responsive services. Therefore, it is envisioned that a large-scale, geographically dispersed, and resource-rich distributed system will emerge and play a key role in the future Internet. However, given the loosely coupled nature of such complex systems, their operational conditions are expected to change significantly over time. In this context, the performance characteristics of such systems will need to be captured rapidly, which is referred to as performance benchmarking, for application deployment, resource orchestration, and adaptive decision-making. Edge performance benchmarking is a nascent research avenue that has started gaining momentum over the past five years. This article first reviews articles published over the past three decades to trace the history of performance benchmarking from tightly coupled to loosely coupled systems. It then systematically classifies previous research to identify the system under test, techniques analyzed, and benchmark runtime in edge performance benchmarking.

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