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- W1966145280 abstract "In the postembryological development of the free-living nematode Caenorhabditis elegans, a morphologically recognizable, nongrowing stage, called the dauerlarva, may arise. Using synchronous populations and following growth and molting, it has been shown that the dauerlarva is formed by a facultative, reversible arrest at a specific point in the life cycle, the second of four cuticle molts, in response to external conditions. At each molt a normal animal passes through “lethargus,” a stage in which feeding and locomotion are transiently arrested. In the dauerlarva stage, feeding is arrested indefinitely and locomotion is markedly reduced. A simple quantitative assay, based on the exceptional resistance of dauerlarvae to sodium dodecyl sulfate (SDS), has been developed to study dauerlarva formation and its reversal. The SDS resistance of dauerlarvae requires both non-feeding and an especially impermeable cuticle. Dauerlarva formation can be efficiently induced by limiting the concentration of bacteria (the food supply), but not by complete starvation. Quantitative recovery to normal development can be induced by transfer to fresh medium with excess bacteria. Simpler stimuli can elicit recovery at slower rates, the principal factors besides nutrition being nutrition being optimal ionic and osmotic conditions and a noninhibitory concentration of animals. There are identifiable stages in recovery, beginning with a resumption of feeding. The cuticle, ultrastructurally very different from normal cuticle, is shed at the next molt, after which development appears normal. A temperature-sensitive mutant, which forms dauerlarvae at high temperature despite the presence of abundant food, is described, and the use of dauerlarvae for further mutant isolation is discussed." @default.
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- W1966145280 date "1975-10-01" @default.
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- W1966145280 title "The dauerlarva, a post-embryonic developmental variant of the nematode Caenorhabditis elegans" @default.
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- W1966145280 doi "https://doi.org/10.1016/0012-1606(75)90109-8" @default.
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