Volume 19, Issue 8 p. 661-664
What The Papers Say

Why are Hox genes clustered?

Richard S. Mann

Richard S. Mann

Department of Biochemistry and Molecular Biophysics, Columbia University College of Physicians and Surgeons, 701 West 168th Street, HHSC 1108, New York, NY 10032

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First published: 05 February 2005
Citations: 42

Abstract

The evolutionarily conserved genomic organization of the Hox genes has been a puzzle ever since it was discovered that their order along the chromosome is similar to the order of their functional domains along the antero-posterior axis. Why has this colinearity been maintained throughout evolution? A close look at regulatory sequences from the mouse Hox clusters(1,2) suggests that enhancer sharing between adjacent Hox genes may be one reason. Moreover, characterizing the activity of one of these mouse enhancers in Drosophila(2) illustrates that despite many similarities, not all Hox clusters are built in the same way.

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