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Control of metamorphosis and pattern formation in Hydratinia (hydrozoa, cnidaria)

✍ Scribed by Stefan Berking

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
869 KB
Volume
13
Category
Article
ISSN
0265-9247

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✦ Synopsis

Hydractinia echinata is a marine colonial hydroid, a relative of the more widely know-n Ilydru. In contrast to Hydra, embryogenesis, metamorphosis and colony growth in Hydractiaiu are experimentally accessible and therefore, provide an ideal model system for investigating the biochemical basis of pattern formation. In particular, the processes involved in the transformation of the drop-shaped freely swimming larva into a sessile tube-shaped polyp are easily monitored, because this transformation can be induced by application of various substances. Our results indicate that the internal level of S-adenosylmethionine (SAM), potentially the most important methyl donor in transmethylation processes, plays a key role in the onset of metamorphosis. It is also proposed that the internal level of SAM plays a pivotal role in the proportioning and spacing of polyps within the colony.

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