linkedin post 2018-10-29 04:59:52

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YEAST CO-OPTED FUNCTION. "Apoptosis rapidly evolved a new, co-opted function in our multicellular yeast with no obvious parallel in the unicellular ancestor. Similarly, the existence of apoptosis-like cellular suicide in the unicellular ancestors of metazoans may be an important preadaptation, facilitating the evolution of complex multicellularity." http://www.pnas.org/content/109/5/1595.full View in LinkedIn
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linkedin post 2018-10-28 02:47:34

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CORROBORATIVE RESULTS. "Remarkably congruent results have been obtained in reconstructions of the gain and loss of introns in eukaryotic genes. In this case, the availability of thousands intron positions provide for the use of powerful ML methods." (ML = maximum likelihood methods). http://onlinelibrary.wiley.com/doi/10.1002/bies.201300037/full View in LinkedIn
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linkedin post 2018-10-29 04:54:55

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YEAST DIVISION OF LABOR. "We also observed the evolution of division of labor within the cluster: most cells remain viable and reproduce, but a minority of cells become apoptotic. Apoptotic cells act as break points within multicellular clusters, allowing snowflake yeast to produce a greater number of propagules from a given number of cells. This is functionally analogous to germ-soma differentiation, where cells specialize into reproductive and nonreproductive tasks. These results demonstrate that multicellular traits readily evolve as a consequence of among-cluster selection." https://lnkd.in/d3qm3Gr View in LinkedIn
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linkedin post 2018-10-29 04:52:26

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EXTRA SPACE. "Until the 20th century, many biologists thought that natural selection favoured old age because it made space for the next generation. If too many people lingered, the group as a whole would suffer. But there was a problem with this logic: the longer individuals live, the more offspring they generally leave. Death might create more room, but it won’t help a species survive." https://lnkd.in/dgftu7G View in LinkedIn
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linkedin post 2018-10-29 04:49:37

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ANONYMOUS NICHE. "The only benefit of aging is that it leads to death that creates a vacancy in the niche. This vacancy could be filled by a close relative or a distant relative or no relative at all, an animal that doesn’t age or even an animal of a different species that shares some of the same food species. Kin selection and even MLS models are not promising for evolution of aging." http://joshmitteldorf.scienceblog.com/2013/07/22/evolution-of-evolution-and-evolution-of-death/ View in LinkedIn
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linkedin post 2018-10-31 04:43:08

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REJUVENATION. "Unlike the process of clonal senescence, where an entire population progressively declines in fitness, here the life potential of the lineage is continually renewed through young offspring cells (the process of rejuvenation) that are produced at the expense of aged parent cells." http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.0030045 View in LinkedIn
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linkedin post 2018-10-31 04:40:09

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SYMMETRIC DIVISION. "We find that the old pole is a significant marker for multiple phenotypes associated with aging, namely, decreased metabolic efficiency (reduced growth rate), reduced offspring biomass production, and an increased chance of death. Thus, E. coli, an organism with a morphologically symmetrical division, no juvenile phase, and no identified separation between germ line and soma, is susceptible to aging." http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.0030045 View in LinkedIn
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linkedin post 2018-10-31 04:37:15

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ASYMMETRIC DIVISION. "With the discovery of aging in single-celled organisms with no clear separation of these two constituents, it has been proposed that reproduction by asymmetric division is a prerequisite for aging and that organisms that reproduce without a distinction between parent and offspring do not age, thus exhibiting functional immortality." http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.0030045 View in LinkedIn
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