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Abstract
We have isolated the Paracentrotus lividus sea urchin H3.3 histone gene and characterized the nucleotide sequences of the gene and its proximal promoter. Band shift experiments showed that two cAMP/PMA responsive elements (CRE/TRE), present in the proximal promoter, bind nuclear factors present in embryos at the blastula and gastrula stages (CRE1) and at the blastula stage (CRE2). The putative H3.3 coding region activating sequences (CRAS) failed to bind nuclear factors while the corresponding elements of the two replication-dependent genes (H3L and late H3) clearly recognized nuclear proteins. These results suggest some role of the CRE/TRE elements but not CRAS elements in the transcriptional regulation of the replication-independent histone genes in invertebrates.
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