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Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the broomrapes.
Horizontal gene transfer (HGT) or lateral gene transfer (LGT) is the movement of genetic material between organisms other than by the ("vertical") transmission of DNA from parent to offspring (reproduction). HGT is an important factor in the evolution of many organisms. HGT is influencing scientific understanding of higher order evolution while more significantly shifting perspectives on bacterial evolution.
In biology and medicine, a host is a larger organism that harbours a smaller organism; whether a parasitic, a mutualistic, or a commensalist guest (symbiont). The guest is typically provided with nourishment and shelter. Examples include animals playing host to parasitic worms, cells harbouring pathogenic (disease-causing) viruses, or a bean plant hosting mutualistic (helpful) nitrogen-fixing bacteria. More specifically in botany, a host plant supplies food resources to micropredators, which have an evolutionarily stable relationship with their hosts similar to ectoparasitism. The host range is the collection of hosts that an organism can use as a partner.
A prophage is a bacteriophage genome that is integrated into the circular bacterial chromosome or exists as an extrachromosomal plasmid within the bacterial cell. Integration of prophages into the bacterial host is the characteristic step of the lysogenic cycle of temperate phages. Prophages remain latent in the genome through multiple cell divisions until activation by an external factor, such as UV light, leading to production of new phage particles that will lyse the cell and spread. As ubiquitous mobile genetic elements, prophages play important roles in bacterial genetics and evolution, such as in the acquisition of virulence factors.
Virulence is a pathogen's or microorganism's ability to cause damage to a host.
Viral evolution is a subfield of evolutionary biology and virology that is specifically concerned with the evolution of viruses. Viruses have short generation times, and many—in particular RNA viruses—have relatively high mutation rates. Although most viral mutations confer no benefit and often even prove deleterious to viruses, the rapid rate of viral mutation combined with natural selection allows viruses to quickly adapt to changes in their host environment. In addition, because viruses typically produce many copies in an infected host, mutated genes can be passed on to many offspring quickly. Although the chance of mutations and evolution can change depending on the type of virus, viruses overall have high chances for mutations.
Esther Miriam Zimmer Lederberg was an American microbiologist and a pioneer of bacterial genetics. She discovered the bacterial virus λ and the bacterial fertility factor F, devised the first implementation of replica plating, and furthered the understanding of the transfer of genes between bacteria by specialized transduction.
Evolution of Infectious Disease is a 1993 book by the evolutionary biologist Paul W. Ewald. In this book, Ewald contests the traditional view that parasites should evolve toward benign coexistence with their hosts. He draws on various studies that contradict this dogma and asserts his theory based on fundamental evolutionary principles. This book provides one of the first in-depth presentations of insights from evolutionary biology on various fields in health science, including epidemiology and medicine.
For the American folk-rock singer-songwriter, see Nancy Moran.
Host–parasite coevolution is a special case of coevolution, where a host and a parasite continually adapt to each other. This can create an evolutionary arms race between them. A more benign possibility is of an evolutionary trade-off between transmission and virulence in the parasite, as if it kills its host too quickly, the parasite will not be able to reproduce either. Another theory, the Red Queen hypothesis, proposes that since both host and parasite have to keep on evolving to keep up with each other, and since sexual reproduction continually creates new combinations of genes, parasitism favours sexual reproduction in the host.
In biology, a pathogen, in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ.
Tracy Palmer is a Professor of Microbiology in the Biosciences Institute at Newcastle University in Tyne & Wear, England. She is known for her work on the twin-arginine translocation (Tat) pathway.
Silvie Huijben is an evolutionary biologist and Assistant Professor at Arizona State University. The Huijben Lab uses fieldwork, lab experiments, and mathematical modeling to study antimalarial and insecticide resistance in parasites, such as disease-transmitting mosquitoes. Her work is focused on applying evolutionary theory to produce resistance management strategies to best combat malaria.
Martha Rebecca Jane Clokie is a Professor of Microbiology at the University of Leicester. Her research investigates the identification and development of bacteriophages that kill pathogens in an effort to develop new antimicrobials.
Heather Hendrickson is a microbiologist and a Senior Lecturer in the School of Biological Sciences at the University of Canterbury in Christchurch, New Zealand. She previously worked at Massey University, Auckland, New Zealand. Her research is focussed on the evolution of bacterial cell shape, and the discovery of bacteriophages that can attack antibiotic-resistant bacteria and the bee disease American foulbrood.
The Fleming Prize Lecture was started by the Microbiology Society in 1976 and named after Alexander Fleming, one of the founders of the society. It is for early career researchers, generally within 12 of being awarded their PhD, who have an outstanding independent research record making a distinct contribution to microbiology. Nominations can be made by any member of the society. Nominees do not have to be members.
Paul E. Turner is an American evolutionary biologist and virologist, the Rachel Carson Professor of ecology and evolutionary biology at Yale University, and a faculty member in microbiology at the Yale School of Medicine. His research focuses on the evolutionary genetics of viruses, particularly bacteriophages and RNA viruses transmitted by mosquitoes.
Kayla C. King is Professor of Evolutionary Ecology at University of Oxford, specialising in how interactions between hosts and parasites show evolutionary change.
Sarah Coulthurst a molecular bacteriologist and Professor of Microbial Interactions at the University of Dundee, UK. Her research focuses increasing understanding of how bacteria can cause disease, and how this information can eventually lead to new medical treatments.
Siv Gun Elisabeth Andersson is a Swedish evolutionary biologist, professor of molecular evolution at Uppsala University. She is member of both the Royal Swedish Academy of Sciences and of Engineering. She is also Head of basic research at the Knut and Alice Wallenberg Foundation and has been co-director of the Swedish national center for large-scale research Science for Life Laboratory between 2017 and 2021. Her research focuses on the evolution of bacteria, mainly on intracellular parasites.
References
- 1 2 3 4 "Q & A Britt Koskella" (PDF). Current Biology. 27: R1249–R1267. 2017. Retrieved 4 May 2021.
- ↑ "Britt Koskella". scholar.google.com. Retrieved 2021-05-03.
- ↑ "Britt Koskella". University of California, Berkeley. 2 October 2014. Retrieved 4 May 2021.
- ↑ "Fleming Prize 2021Q & A - Professor Britt Koskella". Microbiology Society. Retrieved 4 May 2021.
