Lynn Margulis notable work On the origin of mitosing cells
Lynn Margulis (born Lynn Petra Alexander; March 5, 1938 – November 22, 2011) was an American evolutionary biologist, and was the primary modern proponent for the significance of symbiosis in evolution. Historian Jan Sapp has said that "Lynn Margulis's name is as synonymous with symbiosis as Charles Darwin's is with evolution." In particular, Margulis transformed and fundamentally framed current understanding of the evolution of cells with nuclei – an event Ernst Mayr called "perhaps the most important and dramatic event in the history of life" – by proposing it to have been the result of symbiotic mergers of bacteria. Margulis was also the co-developer of the Gaia hypothesis with the British chemist James Lovelock, proposing that the Earth functions as a single self-regulating system, and was the principal defender and promulgator of the five kingdom classification of Robert Whittaker.
Throughout her career, Margulis' work could arouse intense objection (one grant application elicited the response, "Your research is crap. Don't ever bother to apply again.") and her formative paper, "On the Origin of Mitosing Cells", appeared in 1967 after being rejected by about fifteen journals. Still a junior faculty member at Boston University at the time, her theory that cell organelles such as mitochondria and chloroplasts were once independent bacteria was largely ignored for another decade, becoming widely accepted only after it was powerfully substantiated through genetic evidence. Margulis was elected a member of the US National Academy of Sciences in 1983. President Bill Clinton presented her the National Medal of Science in 1999. The Linnean Society of London awarded her the Darwin-Wallace Medal in 2008.
Called "science's unruly earth mother", a "vindicated heretic", or a scientific "rebel", Margulis was a strong critic of neo-Darwinism. Her position sparked lifelong debate with leading neo-Darwinian biologists, including Richard Dawkins, George C. Williams, and John Maynard Smith.: 30, 67, 74–78, 88–92  Margulis' work on symbiosis and her endosymbiotic theory had important predecessors, going back to the mid-19th century – notably Andreas Franz Wilhelm Schimper, Konstantin Mereschkowski, Boris Kozo-Polyansky, and Ivan Wallin – and Margulis, not only promoted greater recognition for their contributions, but personally oversaw the first English translation of Kozo-Polyansky's Symbiogenesis: A New Principle of Evolution, which appeared the year before her death. Many of her major works, particularly those intended for a general readership, were collaboratively written with her son Dorion Sagan.
In 2002, Discover magazine recognized Margulis as one of the 50 most important women in science.Contributions
Endosymbiosis theory
In 1966, as a young faculty member at Boston University, Margulis wrote a theoretical paper titled "On the Origin of Mitosing Cells". The paper, however, was "rejected by about fifteen scientific journals," she recalled. It was finally accepted by Journal of Theoretical Biology and is considered today a landmark in modern endosymbiotic theory. Weathering constant criticism of her ideas for decades, Margulis was famous for her tenacity in pushing her theory forward, despite the opposition she faced at the time. The descent of mitochondria from bacteria and of chloroplasts from cyanobacteria was experimentally demonstrated in 1978 by Robert Schwartz and Margaret Dayhoff. This formed the first experimental evidence for the symbiogenesis theory. The endosymbiosis theory of organogenesis became widely accepted in the early 1980s, after the genetic material of mitochondria and chloroplasts had been found to be significantly different from that of the symbiont's nuclear DNA.In 1995, English evolutionary biologist Richard Dawkins had this to say about Lynn Margulis and her work:Journals
Margulis (Sagan), L (1967). "On the Origin of Mitosing Cells". Journal of Theoretical Biology. 14 (3): 225–274. Bibcode:1967JThBi..14..225S. doi:10.1016/0022-5193(67)90079-3. PMID 11541392.
Margulis, L (1976). "Genetic and evolutionary consequences of symbiosis". Experimental Parasitology. 39 (2): 277–349. doi:10.1016/0014-4894(76)90127-2. PMID 816668.
Margulis, L (1980). "Undulipodia, flagella and cilia". Biosystems. 12 (1–2): 105–108. doi:10.1016/0303-2647(80)90041-6. PMID 7378551.
Margulis, L; Bermudes, D (1985). "Symbiosis as a mechanism of evolution: status of cell symbiosis theory". Symbiosis. 1: 101–124. PMID 11543608.
Sagan, D; Margulis, L (1987). "Gaia and the evolution of machines". Whole Earth Review. 55: 15–21. PMID 11542102.
Bermudes, D; Margulis, L; Tzertzinis, G (1987). "Prokaryotic origin of undulipodia. Application of the panda principle to the centriole enigma". Annals of the New York Academy of Sciences. 503 (1): 187–197. Bibcode:1987NYASA.503..187B. doi:10.1111/j.1749-6632.1987.tb40608.x. PMID 3304075. S2CID 39709909.
Lazcano, A; Guerrero, R; Margulis, L; Oró, J (1988). "The evolutionary transition from RNA to DNA in early cells". Journal of Molecular Evolution. 27 (4): 283–290. Bibcode:1988JMolE..27..283L. doi:10.1007/bf02101189. PMID 2464698. S2CID 21008416.
Margulis, L (1990). "Words as battle cries—symbiogenesis and the new field of endocytobiology". BioScience. 40 (9): 673–677. doi:10.2307/1311435. JSTOR 1311435. PMID 11541293.
Margulis, L (1996). "Archaeal-eubacterial mergers in the origin of Eukarya: phylogenetic classification of life". Proceedings of the National Academy of Sciences of the United States of America. 93 (3): 1071–1076. Bibcode:1996PNAS...93.1071M. doi:10.1073/pnas.93.3.1071. PMC 40032. PMID 8577716.
Chapman, MJ; Margulis, L (1998). "Morphogenesis by symbiogenesis". International Microbiology. 1 (4): 319–26. PMID 10943381.
Margulis, L.; Dolan, M. F.; Guerrero, R. (2000). "The chimeric eukaryote: Origin of the nucleus from the karyomastigont in amitochondriate protists". Proceedings of the National Academy of Sciences. 97 (13): 6954–6959. Bibcode:2000PNAS...97.6954M. doi:10.1073/pnas.97.13.6954. PMC 34369. PMID 10860956.
Wier, A.; Dolan, M.; Grimaldi, D.; Guerrero, R.; Wagensberg, J.; Margulis, L. (2002). "Spirochete and protist symbionts of a termite (Mastotermes electrodominicus) in Miocene amber". Proceedings of the National Academy of Sciences. 99 (3): 1410–1413. Bibcode:2002PNAS...99.1410W. doi:10.1073/pnas.022643899. PMC 122204. PMID 11818534.
Dolan, Michael F.; Melnitsky, Hannah; Margulis, Lynn; Kolnicki, Robin (2002). "Motility proteins and the origin of the nucleus". The Anatomical Record. 268 (3): 290–301. doi:10.1002/ar.10161. PMID 12382325. S2CID 7405778.
Margulis, L (2005). "Hans Ris (1914–2004). Genophore, chromosomes and the bacterial origin of chloroplasts". International Microbiology. 8 (2): 145–8. PMID 16052465.
Margulis, L.; Chapman, M.; Guerrero, R.; Hall, J. (2006). "The last eukaryotic common ancestor (LECA): Acquisition of cytoskeletal motility from aerotolerant spirochetes in the Proterozoic Eon". Proceedings of the National Academy of Sciences. 103 (35): 13080–13085. Bibcode:2006PNAS..10313080M. doi:10.1073/pnas.0604985103. PMC 1559756. PMID 16938841.
Dolan, MF; Margulis, L (2007). "Advances in biology reveal truth about prokaryotes". Nature. 445 (7123): 21. Bibcode:2007Natur.445...21D. doi:10.1038/445021b. PMID 17203039. S2CID 4426413.
Margulis, Lynn; Chapman, Michael; Dolan, Michael F. (2007). "Semes for analysis of evolution: de Duve's peroxisomes and Meyer's hydrogenases in the sulphurous Proterozoic eon". Nature Reviews Genetics. 8 (10): 1. doi:10.1038/nrg2071-c1. PMID 17923858. S2CID 33808568.
Brorson, O.; Brorson, S.-H.; Scythes, J.; MacAllister, J.; Wier, A.; Margulis, L. (2009). "Destruction of spirochete Borrelia burgdorferi round-body propagules (RBs) by the antibiotic Tigecycline". Proceedings of the National Academy of Sciences. 106 (44): 18656–18661. Bibcode:2009PNAS..10618656B. doi:10.1073/pnas.0908236106. PMC 2774030. PMID 19843691.
Wier, AM; Sacchi, L; Dolan, MF; Bandi, C; Macallister, J; Margulis, L (2010). "Spirochete attachment ultrastructure: Implications for the origin and evolution of cilia". The Biological Bulletin. 218 (1): 25–35. doi:10.1086/BBLv218n1p25. PMID 20203251. S2CID 21634272.
Guerrero, R; Margulis, L; Berlanga, M; Bandi, C; Macallister, J; Margulis, L (2013). "Symbiogenesis: the holobiont as a unit of evolution". International Microbiology. 16 (3): 133–143. doi:10.2436/20.1501.01.188. PMID 24568029.
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