Re[2]: antiquity of segmentation

From
Date
     Just to add my two penn'orth, see the article 'the ancestry of 
     segmentation' by Eddy De Robertis in the 1 May issue of Nature (vol. 
     387, pp25-26), commenting on the discovery of insect-like segmental 
     expression of engrailed in the amphioxus (Holland, L. Z. et al., 
     Development vol. 124, pp1723-1732; 1997)
     
     Henry Gee


______________________________ Reply Separator _________________________________
Subject: Re: antiquity of segmentation
Author:  paleonet@ucmp1.berkeley.edu at Internet
Date:    14/05/97 15:35


On Wed, 14 May 1997, Bill Shear wrote:
     
> Last week a very exciting and interesting article and commentary appeared 
> in SCIENCE showing the possible homology of segmentation genes in
> arthropods and chordates. DiRobertis, in a commentary, proposed that
> segmentation therefore would have to have been a property of the common 
> ancestor of protostomes and deuterostomes.  He went on to list a number 
> other properties this hypothetical ancester would have to have had,
> suggesting that it would have been much more complex than originally 
> envisioned.
> 
> Has anyone else been following this work?  Have the relevant genes been 
> searched for in, for instance, echinoderms or hemichordates?