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. 1998 Jul 1;17(13):3619–3630. doi: 10.1093/emboj/17.13.3619

Identification of novel stress-induced genes downstream of chop.

X Z Wang 1, M Kuroda 1, J Sok 1, N Batchvarova 1, R Kimmel 1, P Chung 1, H Zinszner 1, D Ron 1
PMCID: PMC1170698  PMID: 9649432

Abstract

CHOP (GADD153) is a small nuclear protein that dimerizes avidly with members of the C/EBP family of transcription factors. Normally undetectable, it is expressed at high levels in cells exposed to conditions that perturb protein folding in the endoplasmic reticulum and induce an endoplasmic reticulum stress response. CHOP expression in stressed cells is linked to the development of programmed cell death and, in some instances, cellular regeneration. In this study, representational difference analysis was used to compare the complement of genes expressed in stressed wild-type mouse embryonic fibroblasts with those expressed in cells nullizygous for chop. CHOP expression, in concert with a second signal, was found to be absolutely required for the activation by stress of a set of previously undescribed genes referred to as DOCs (for downstream of CHOP). DOC4 is a mammalian ortholog of a Drosophila gene, Tenm/Odz, implicated in patterning of the early fly embryo, whereas DOC6 encodes a newly recognized homolog of the actin-binding proteins villin and gelsolin. These results reveal the existence of a novel CHOP-dependent signaling pathway, distinct from the known endoplasmic reticulum unfolded protein response, which may mediate changes in cell phenotype in response to stress.

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Selected References

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