Choanoflagellates could help explain a key step in animal evolution | Science News


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A signature characteristic of animal movement and morphogenesis are collective cell contractions that produce global tissue deformations. The origin of collective animal contractility, however, remains unclear. When surveying Curaçao's Caribbean Island for choanoflagellates, animals ' closest living relatives, researchers isolated a previously undescribed organism (C. flexa) that forms multicellular colonies in the shape of a cup. In response to changing light levels, the colonies rapidly invert their curvature, which they detect through a pathway of rhodopsin – cyclic guanosine monophosphate. Inversion requires apical contractility mediated by actomyosin and enables alternation between the action of feeding and swimming. C. flexa rapidly transforms sensory inputs into multicellular contractions. These findings may inform reconstructions of hypothesized ancestors of animals that existed before specialized sensory and contractile cells evolved.


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21.10.2019 14:25
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!sources

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Plag detected:

https://science.sciencemag.org/content/366/6463/326

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21.10.2019 14:57
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When posting content that either is owned by someone else or inspired by someone else’s works, it is proper to list the said source in your post with a link to the original.

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21.10.2019 14:57
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Flagged for copy/paste.

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21.10.2019 19:12
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21.10.2019 19:24
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21.10.2019 19:28
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21.10.2019 22:05
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21.10.2019 22:35
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07.06.2020 05:29
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