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. 1982 Jan;79(1):127–131. doi: 10.1073/pnas.79.1.127

Specific cell—cell contacts are essential for induction of gene expression during differentiation of Dictyostelium discoideum

Daphne D Blumberg 1, Jeanne P Margolskee 1,*, Eric Barklis 1, Stephen N Chung 1, Naomi S Cohen 1, Harvey F Lodish 1
PMCID: PMC345675  PMID: 16593139

Abstract

Postaggregation Dictyostelium discoideum cells contain 2000-3000 mRNA species that are absent from pre-aggregation cells. These aggregation-dependent sequences compose 30% of the mass of the late mRNA and represent the transcription products of an additional 11% of the single-copy genome. By analysis of mutants that are blocked at different stages of differentiation, we show that induction of expression of these genes is correlated with the formation of tight cell—cell contacts that resist EDTA. In particular, mutants that exhibit chemotaxis and aggregate to form loose mounds but do not form cell—cell contacts that resist EDTA fail to induce these late mRNA and protein species. By contrast, mutants that form normal contacts but progress no further through development do express the late mRNA species. Thus, interactions at the cell surface are involved in developmental induction of a large group of coregulated mRNAs. We have employed two independent assays for these developmentally regulated mRNAs: hybridization of gel-separated RNAs to cloned nuclear DNAs and hybridization of mRNA to a cDNA probe specific for the population of 2000-3000 regulated sequences.

Keywords: contact sites A, aggregation-dependent mRNAs

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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