linkedin post 2018-08-19 05:19:18

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CONTROL SYSTEMS. "Evidence is accumulating that major gene-switching events in plants, such as flowering, are regulated by complex control systems which ensures that development occurs only in the correct groups of cells at the appropriate time. A similar, or more sophisticated system might thus be expected to regulate alternation of generation." http://onlinelibrary.wiley.com/doi/10.1111/j.1469-185X.1994.tb01277.x/abstract View in LinkedIn
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linkedin post 2018-08-19 05:21:35

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SOMA AND GERM COLLABORATION. "Importantly, development of male and female gametes does not occur in isolation. The formation of meiocytes, gametophytes, and gametes requires the active presence of neighboring helper cells. Recent data on the interaction between reproductive cell lines and these largely somatic helper populations highlight not only the complexity of this relationship and the significance of the events it regulates but also its two-way nature." http://www.sciencedirect.com/science/article/pii/S1534580713000427 View in LinkedIn
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linkedin post 2018-08-19 05:23:28

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BILATERAL COLLABORATION. "New data reveal a two-way relationship between early reproductive cells and their helpers involving complex epigenetic and signaling networks determining cell number and fate. Later, the egg cell plays a central role in specifying accessory cells, whereas in both gametophytes, companion cells contribute non-cell-autonomously to the epigenetic landscape of the gamete genomes." http://www.sciencedirect.com/science/article/pii/S1534580713000427 View in LinkedIn
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linkedin post 2018-08-19 05:24:54

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PARALLEL IN ANIMALS. "Plant reproductive development thus mirrors that of animals, where the development of viable gametes relies on interactions between soma and germline, for example, between Sry-expressing Sertoli cells and the male germline, preventing an “egg” developmental pathway from being followed." http://www.sciencedirect.com/science/article/pii/S1534580713000427 View in LinkedIn
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linkedin post 2018-08-19 05:26:53

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OUTSOURCED FUNCTIONS. "It is also evident that certain functions vital for protecting transgenerational genome integrity in animal germ cells, such as the suppression of transposition in the germ cell genome, has been partially “outsourced” to gametophytic helper cells in plants." (Targeted at suppressing parasitic mobile genetic elements by transposing silencing). http://www.sciencedirect.com/science/article/pii/S1534580713000427 View in LinkedIn
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linkedin post 2018-08-19 05:28:58

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DIFFERENT HELPER CELL GROUPS. "Depending on their sex and their stage of development, plant reproductive cell lineages are associated with different supporting cell populations. In the stamen, male meiotic cells are invested by a layer of sporophytic (somatic) tapetal cells, which are essential for postmeiotic development and, particularly, the synthesis of the sporopollenin pollen wall and its coating." http://www.sciencedirect.com/science/article/pii/S1534580713000427 View in LinkedIn
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linkedin post 2018-08-19 05:34:18

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SO ENDS this first of two weekends on plant alternation of generations. That such a complex system exists is in part due to the necessity of not increasing chromosome numbers during successive generations, as well as the cobbling together of available tools that were handy. Evolution is a zig zaggy chaotic process with many dead ends and mistakes. Nothing was purpose-built. View in LinkedIn
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linkedin post 2018-08-20 04:58:02

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REPETITIVE DNA. “Telomeres are structures found at the ends of linear chromosomes and consist of repetitive DNA sequences. Telomeres apparently prevent recombination and allow the attachment of chromosome ends to the nuclear envelope.” http://protein.bio.msu.ru/biokhimiya/contents/v62/full/62111380.html View in LinkedIn
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linkedin post 2018-08-20 04:59:34

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CONSERVED REPEATS. “The telomeres in human cells consist of thousands of repeats of the sequence TTAGGG. This sequence is remarkably conserved from primitive organisms to humans. The sequence is found in all invertebrates and in some trypanosomes and slime molds.” http://protein.bio.msu.ru/biokhimiya/contents/v62/full/62111380.html View in LinkedIn
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