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Development, Vol 127, Issue 1 155-166, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
E Ferretti, H Marshall, H Popperl, M Maconochie, R Krumlauf and F Blasi
Molecular Genetics Unit, DIBIT, Universita Vita-Salute S. Raffaele, Milan, Italy.
Direct auto- and cross-regulatory interactions between Hox genes serve to establish and maintain segmentally restricted patterns in the developing hindbrain. Rhombomere r4-specific expression of both Hoxb1 and Hoxb2 depends upon bipartite cis Hox response elements for the group 1 paralogous proteins, Hoxal and Hoxbl. The DNA-binding ability and selectivity of these proteins depend upon the formation of specific heterodimeric complexes with members of the PBC homeodomain protein family (Pbx genes). The r4 enhancers from Hoxb1 and Hoxb2 have the same activity, but differ with respect to the number and organisation of bipartite Pbx/Hox (PH) sites required, suggesting the intervention of other components/sequences. We report here that another family of homeodomain proteins (TALE, Three-Amino acids-Loop-Extension: Prep1, Meis, HTH), capable of dimerizing with Pbx/EXD, is involved in the mechanisms of r4-restricted expression. We show that: (1) the r4-specific Hoxb1 and Hoxb2 enhancers are complex elements containing separate PH and Prep/Meis (PM) sites; (2) the PM site of the Hoxb2, but not Hoxb1, enhancer is essential in vivo for r4 expression and also influences other sites of expression; (3) both PM and PH sites are required for in vitro binding of Prepl-Pbx and formation and binding of a ternary Hoxbl-Pbxla (or 1b)-Prepl complex. (4) A similar ternary association forms in nuclear extracts from embryonal P19 cells, but only upon retinoic acid induction. This requires synthesis of Hoxbl and also contains Pbx with either Prepl or Meisl. Together these findings highlight the fact that PM sites are found in close proximity to bipartite PH motifs in several Hox responsive elements shown to be important in vivo and that such sites play an essential role in potentiating regulatory activity in combination with the PH motifs.
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