Viral eukaryogenesis
- Viral eukaryogenesis
Viral eukaryogenesis is the
hypothesis that thecell nucleus ofeukaryotic life forms evolved from a largeDNA virus in a form of endosymbiosis within anarchaea cell. It was proposed by Philip Bell in 2001, and gained support as large complex DNA viruses capable ofprotein biosynthesis (such asMimivirus ) have been discovered.A number of precepts in the theory are possible. For instance, a helical virus with a bilipid envelope bears a distinct resemblance to a highly simplified cellular nucleus (ie: a DNA chromosome encapsulated within a lipid membrane). To consider the concept logically, a large DNA virus would take control of a
bacteria l orarchaea l cell. Instead of replicating and destroying the host cell, it would remain within the cell. With the virus in control of the host cell's molecular machinery it would effectively become a "nucleus" of sorts. Through the processes ofmitosis andcytokinesis , the virus would thus hijack the entire cell—an extremely favourable way to ensure its survival.References
* Bell, Philip John Livingstone. "Viral Eukaryogenesis: Was the Ancestor of the Nucleus a Complex DNA Virus?" Journal of Molecular Evolution, Volume 53, Issue 3, Sep 2001, pgs. 251–256
Wikimedia Foundation. 2010.
Look at other dictionaries:
Eucariogénesis viral — Saltar a navegación, búsqueda La eucariogénesis viral es una hipótesis que sostiene que el núcleo de la célula eucariota evolucionó de un gran virus ADN mediante endosimbiosis dentro una célula de arquea. Fue propuesta en 2001 por Philip Bell y… … Wikipedia Español
Evolution of sexual reproduction — The evolution of sexual reproduction is currently described by several competing scientific hypotheses. All sexually reproducing organisms derive from a common ancestor which was a single celled eukaryotic species[1]. Many protists reproduce… … Wikipedia
PAM — or PAM may refer to: Contents 1 Companies 2 Organisations 3 Military … Wikipedia
Cell nucleus — HeLa cells stained for the cell nucleus DNA with the Blue Hoechst dye. The central and rightmost cell are in interphase, thus their entire nuclei are labeled. On the left, a cell is going through mitosis and its DNA has condensed ready for… … Wikipedia
Клеточное ядро — Клетки HeLa, ДНК которых окрашена голубым красителем Хёхста 33258. Центральная и правая клетки находятся в интерфазе, поэтому окрашено всё ядро. Клетка слева находится в состоянии митоза (анафаза), поэтому её ядро не видно, а ДНК сконденсирована… … Википедия
Eukaryote — Eukaryotes Temporal range: Proterozoic – Recent Scientific classification Domain: Eukaryota Whittaker Margulis,1978 Kingdoms … Wikipedia
Núcleo celular — Células HeLa teñidas mediantes la tinción de Hoechst, que marca en azul el ADN. La célula central y la última de la der … Wikipedia Español
Telomerase — is an enzyme that adds specific DNA sequence repeats ( TTAGGG in all vertebrates) to the 3 ( three prime ) end of DNA strands in the telomere regions, which are found at the ends of eukaryotic chromosomes. The telomeres contain condensed DNA… … Wikipedia
Endosymbiotic theory — The endosymbiotic theory concerns the origins of mitochondria and plastids (e.g. chloroplasts), which are organelles of eukaryotic cells. According to this theory, these organelles originated as separate prokaryotic organisms which were taken… … Wikipedia
History of Earth — The history of Earth covers approximately 4.6 billion years (4,567,000,000 years), from Earth’s formation out of the solar nebula to the present. This article presents a broad overview, summarizing the leading, most current scientific… … Wikipedia
