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Molecular and Cellular Biology, February 2001, p. 1360-1369, Vol. 21, No. 4
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.4.1360-1369.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
The Polycomb Group Protein EED Interacts with YY1, and Both
Proteins Induce Neural Tissue in Xenopus
Embryos
David P. E.
Satijn,
Karien M.
Hamer,
Jan
den
Blaauwen, and
Arie P.
Otte*
Swammerdam Institute for Life Sciences, BioCentrum
Amsterdam, University of Amsterdam, 1018 TV Amsterdam, The
Netherlands
Received 17 August 2000/Returned for modification 14 September
2000/Accepted 27 October 2000
Polycomb group (PcG) proteins form multimeric protein complexes
which are involved in the heritable stable repression of genes. Previously, we identified two distinct human PcG protein complexes. The
EED-EZH protein complex contains the EED and EZH2 PcG proteins, and the
HPC-HPH PcG complex contains the HPC, HPH, BMI1, and RING1 PcG
proteins. Here we show that YY1, a homolog of the
Drosophila PcG protein pleiohomeotic (Pho), interacts
specificially with the human PcG protein EED but not with proteins of
the HPC-HPH PcG complex. Since YY1 and Pho are DNA-binding proteins,
the interaction between YY1 and EED provides a direct link between the
chromatin-associated EED-EZH PcG complex and the DNA of target genes.
To study the functional significance of the interaction, we expressed
the Xenopus homologs of EED and YY1 in
Xenopus embryos. Both Xeed and XYY1 induce an ectopic
neural axis but do not induce mesodermal tissues. In contrast, members
of the HPC-HPH PcG complex do not induce neural tissue. The exclusive,
direct neuralizing activity of both the Xeed and XYY1 proteins
underlines the significance of the interaction between the two
proteins. Our data also indicate a role for chromatin-associated
proteins, such as PcG proteins, in Xenopus neural induction.
*
Corresponding author. Mailing address: Swammerdam
Institute for Life Sciences, BioCentrum Amsterdam, University of
Amsterdam, Plantage Muidergracht 12, 1018 TV Amsterdam, The
Netherlands. Phone: 31-20-5255115. Fax: 31-20-5255090. E-mail:
arie.otte{at}chem.uva.nl.

Present address: Department of Biology, University of California,
San Diego, La Jolla, CA
92093.
Molecular and Cellular Biology, February 2001, p. 1360-1369, Vol. 21, No. 4
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.4.1360-1369.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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