PubMed:8999960
Annnotations
{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/8999960","sourcedb":"PubMed","sourceid":"8999960","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/8999960","text":"GATA-1 DNA binding activity is down-regulated in late S phase in erythroid cells.\nWe have set out to test a model for tissue-specific gene expression that relies on the early replication of expressed genes to sequester limiting activating transcription factors. Using an erythroid cell line, we have tested the changes in the DNA binding activity of the lineage-restricted transcription factor GATA-1 through the cell cycle. We find that GATA-1 activity is low in G1, peaks in mid-S phase, and then decreases in G2/M. In contrast, the binding activities of two ubiquitous transcription factors, Oct1 and Sp1, remain high in G2/M. GATA-1 protein and mRNA vary in a similar manner through the cell cycle, suggesting that the expression of the gene or the stability of its message is regulated. Although a number of transcription factors involved in the control of the cell cycle or DNA replication have been shown to peak in S phase, this is the first example of a lineage-restricted transcription factor displaying S phase-specific DNA binding activity. One interpretation of these data leads to a model in which the peak in GATA-1 DNA binding amplifies the effect of early replication on the activation of erythroid-specific genes at the same time as preventing activation of non-erythroid genes containing GATA-responsive elements. 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