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Vol. 16, No. 14, pp. 1815-1827, July 15, 2002
Department of Genetics, University of Pennsylvania School of
Medicine, Philadelphia, Pennsylvania 19104, USA
In Caenorhabditis elegans, Ras/ERK and Wnt/
-catenin
signaling pathways cooperate to induce P12 and vulval cell fates in a Hox-dependent manner. Here we describe eor-1 and eor-2,
two new positively acting nuclear components of the Ras and Wnt
pathways. eor-1 and eor-2 act downstream or in parallel
to ERK and function redundantly with the Mediator complex gene
sur-2 and the functionally related gene lin-25, such
that removal of both eor-1/eor-2 and sur-2/lin-25
mimics the removal of a main Ras pathway component. Furthermore, the
eor-1 and eor-2 mutant backgrounds reveal an essential
role for the Elk1-related gene lin-1. eor-1 and
eor-2 also act downstream or in parallel to pry-1 Axin
and therefore act at the convergence of the Ras and Wnt pathways.
eor-1 encodes the ortholog of human PLZF, a BTB/zinc-finger
transcription factor that is fused to RAR
in acute promyelocytic
leukemia. eor-2 encodes a novel protein. EOR-1/PLZF and EOR-2
appear to function closely together and cooperate with Hox genes to
promote the expression of Ras- and Wnt-responsive genes. Further
studies of eor-1 and eor-2 may provide insight into the
roles of PLZF in normal development and leukemogenesis.
[Key Words: eor-1; eor-2; PLZF; Ras; Wnt]
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