Model For Evolution

Posted by
DA Morgan on Dec 18, 2001 at 13:26
win43.drizzle.com (216.162.193.202)

A microorganism whose evolutionary roots can be traced to the era of the first multicellular animals may provide a glimpse of how single-celled organisms made a critical evolutionary leap.

In analyzing the single-celled choanoflagellates, scientists discovered that the organisms have a type of molecular sensor usually found in multicellular animals. This is the first time that such a sensor, called a receptor tyrosine kinase, has been found in a single-celled organism, said Sean B. Carroll, a Howard Hughes Medical Institute investigator at the University of Wisconsin, Madison. Carroll and Wisconsin colleague Nicole King reported their findings in the December 18, 2001, edition of the Proceedings of the National Academy of Sciences.

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