{"id":3318,"date":"2020-01-21T11:32:38","date_gmt":"2020-01-21T11:32:38","guid":{"rendered":"https:\/\/www.editage.com\/insights\/new-image-analysis-method-for-time-lapse-microscopy-shows-how-giant-viruses-infect-amoeba\/"},"modified":"2025-01-15T06:31:06","modified_gmt":"2025-01-15T06:31:06","slug":"new-image-analysis-method-for-time-lapse-microscopy-shows-how-giant-viruses-infect-amoeba","status":"publish","type":"post","link":"https:\/\/www.editage.com\/insights\/new-image-analysis-method-for-time-lapse-microscopy-shows-how-giant-viruses-infect-amoeba","title":{"rendered":"New image analysis method for time-lapse microscopy shows how giant viruses infect amoeba"},"content":{"rendered":"

Viruses are probably the most peculiar \u201clife forms\u201d known to us, with each species having unique characteristics. One thing common to all viruses is that they attack a \u201chost\u201d cell and hijack its machinery, using it for its own replication. A type of large virus, called \u201cgiant virus,\u201d has interesting ways of attacking its host organism\u2014an amoeba. Virologists have been trying to understand what makes these viruses so unique for some time now, but to observe them, complex techniques are required. <\/span><\/span><\/span><\/span><\/p>\n

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A method called phase-contrast microscopy is commonly used to study all types of cells, including amoebal cells. But, this technique relies heavily on the variation in the conditions of the cell and its background, and sometimes this leads to disruptions in the image produced\u2014for example \u201chalo\u201d (in which the cell is surrounded by a bright light) and \u201cshade-off\u201d (in which the inside of the cell and background are of a similar intensity). This is why, to dig deeper into exactly how giant viruses infect amoebal cells, more efficient cell-tracking techniques are needed. Just earlier this month, scientists from the Tokyo University of Science, led by Professor Masaharu Takemura, had reported the discovery of two new species of pandoravirus and mimivirus<\/a><\/span><\/span>\u2014both families of giant viruses infecting amoebae\u2014from a riverbank in Japan. Prof Takemura says that continual discovery of viruses from soil is crucial from the standpoint of understanding the ecology of giant viruses. <\/span><\/span><\/span><\/span><\/p>\n

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More importantly, in a brand new study published in Frontiers in Microbiology<\/i><\/a><\/span><\/span>, a team of scientists at Tokyo University of Science, once again led by Prof Takemura, tried to understand the behavior in which amoebal cells infected with different types of giant viruses. For this, they devised a new cell-tracking method that tackles the issues of conventional analysis methods. Prof Takemura elaborates on the motivation of the study, \u201cOur aim was to understand how giant viruses infect amoebae in the natural environment and how this has affected to evolution of eukaryotes. For this, we wanted to develop a technique to quantitatively detect the time-dependent, sequential changes in cellular number, size, shape, and direction and distance of cell motility.\u201d<\/span><\/span><\/span><\/span><\/p>\n

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In their study, Prof Takemura and his team focused on amoebae that were infected by a family of giant virus called \u201cmarseillevirus<\/span>\u201d. To understand the behavior of host cells infected with this particular type of virus, the scientists <\/span>developed a new algorithm that can trace individual amoebal cells in a population of amoebae using time-lapse phase-contrast microscopic images. They named this algorithm as \u201cPhase-contrast-based Kinetic Analysis Algorithm for Amoebae\u201d or PKA3. Using PKA3, the scientists revealed new, interesting aspects of how amoebae react to a giant virus attack. For example, they quantitatively showed that giant virus-infected amoebal cells formed aggregates or \u201cbunches.\u201d They inferred that this could be either an antiviral strategy of the host or how the virus spreads, shedding light on the manner in which the viral infection takes place. What\u2019s more, they managed to detect changes in the number of cells and the appearance of marseillevirus-infected amoebae <\/i>much faster than by conventional methods. Interestingly, they could also analyze the time taken by amoebae to respond to a viral infection, providing useful information on the life cycle of amoebae and viruses and the relationship between them. Prof Takemura<\/span> says, \u201cOur algorithm was successful in visualizing the movement of cells in images produced by phase-contrast microscopy, a method widely used in cell biology. Also, it allowed quantification of various parameters. This research will greatly contribute to the demonstration of amoeba behavior infected with the giant virus.\u201d<\/span><\/span><\/span><\/span><\/p>\n

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Apart from studying giant viruses, this new algorithm could be used for various other applications, such as to study the dynamics of cancer cells, lymphocytes, macrophages, and neurons. In general, it could reveal new cellular phenomena by tracking exactly how these cells migrate. Prof Takemura concludes by saying, \u201c<\/span>Our new analytical method could be applied to all cells that can be observed with a phase-contrast microscope and can potentially be applied to various fields including cell biology, medicine, and biotechnology.\u201d<\/span><\/span><\/span><\/span><\/p>\n

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Indeed, a technique like this\u2014which can potentially make cell biology research easier\u2014was much needed!\u00a0 <\/span><\/span><\/span><\/span><\/p>\n

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Reference<\/span><\/b><\/span><\/span><\/p>\n\n\n\n\n\n\n\n\n\n
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Title\u00a0of original paper:<\/span><\/span><\/span><\/span><\/p>\n<\/td>\n

\n

Kinetic analysis of the motility of giant virus-infected amoebae using phase-contrast microscopic images<\/span><\/span><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

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Journal:<\/span><\/span><\/span><\/span><\/p>\n<\/td>\n

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Frontiers in Microbiology<\/span><\/span><\/i><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

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DOI:<\/span><\/span><\/span><\/span><\/p>\n<\/td>\n

\n

10.3389\/fmicb.2019.03014<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u00a0<\/p>\n<\/td>\n

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\u00a0<\/p>\n<\/td>\n<\/tr>\n

\n

Title of original paper:<\/span><\/span><\/span><\/span><\/p>\n<\/td>\n

\n

Co-Isolation and Characterization of Two Pandoraviruses and a Mimivirus from a Riverbank in Japan<\/span><\/span><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

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Journal:<\/span><\/span><\/span><\/span><\/p>\n<\/td>\n

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Viruses<\/span><\/span><\/i><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n

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DOI:<\/span><\/span><\/span><\/span><\/p>\n<\/td>\n

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10.3390\/v11121123<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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About The Tokyo University of Science<\/b><\/span><\/span><\/span><\/p>\n

Tokyo University of Science<\/a> (TUS) is a well-known and respected university, and the largest science-specialized private research university in Japan, with four campuses in central Tokyo and its suburbs and in Hokkaido. Established in 1881, the university has continually contributed to Japan’s development in science through inculcating the love for science in researchers, technicians, and educators. <\/span><\/span><\/span><\/span><\/p>\n

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With a mission of \u201cCreating science and technology for the harmonious development of nature, human beings, and society”, TUS has undertaken a wide range of research from basic to applied science. TUS has embraced a multidisciplinary approach to research and undertaken intensive study in some of today’s most vital fields. TUS is a meritocracy where the best in science is recognized and nurtured. It is the only private university in Japan that has produced a Nobel Prize winner and the only private university in Asia to produce Nobel Prize winners within the natural sciences field. <\/span><\/span><\/span><\/span><\/p>\n

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About Prof Masaharu Takemura from Tokyo University of Science<\/b><\/span><\/span><\/span><\/p>\n

Dr Masaharu Takemura is a Professor of molecular biology & giant virus biology at the Faculty of Science, Tokyo University of Science. He is the corresponding author of this study. <\/span>A respected and senior researcher, he has more than 95 research publications to his credit. <\/span>He is engaged in the study of virology and cell biology, and<\/span> his main research aim is to elucidate the evolutionary mechanisms of giant viruses and eukaryotes, and their relationships. <\/span><\/span><\/span><\/span><\/p>\n

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Funding information<\/b><\/span><\/span><\/span><\/p>\n

This study was supported by the Tokyo University of Science Grant for President’s Research Promotion. <\/span><\/span><\/span><\/p>\n

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Media contact<\/strong><\/p>\n

Tsutomu Shimizu <\/span><\/span><\/span><\/span><\/p>\n

Email: <\/span><\/span>mediaoffice@admin.tus.ac.jp<\/a><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Viruses are probably the most peculiar \u201clife forms\u201d known to us, with each species having unique characteristics. One thing common to all viruses is that they attack a \u201chost\u201d cell and hijack its machinery, using it for its own replication. A type of large virus, called \u201cgiant virus,\u201d has interesting ways of attacking its host […]<\/p>\n","protected":false},"author":1152,"featured_media":33313,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[2435],"tags":[2482],"new_categories":[],"new_tags":[],"series":[],"class_list":["post-3318","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trending-research","tag-science-update"],"acf":[],"yoast_head":"\nNew image analysis method for time-lapse microscopy shows how giant viruses infect amoeba | Editage Insights<\/title>\n<meta name=\"description\" content=\"Research team headed by Prof Masaharu Takemura from Tokyo University of Science discovered a new image analysis method for time-lapse microscopy shows how giant viruses infect amoeba\" \/>\n<meta name=\"robots\" content=\"index, follow, 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