Isolation and characterization of BEN, a member of the TFII-I family of DNA-binding proteins containing distinct helix-loop-helix domains.

The transcriptional regulation of the Hoxc8 gene is controlled during early mouse embryogenesis by an enhanceosome-like control region, termed the early enhancer (EE), located 3 kb upstream from the Hoxc8 translation start site. The EE is involved in establishing the posterior expression pattern of Hoxc8 at embryonic day (E) 8.5-9. 0. Genetic and biochemical data have shown that nuclear factors interact with this region in a sequence-specific manner. We have used a yeast one-hybrid screen in a search for transcription factors that bind to EE motifs and have isolated a novel murine DNA-binding protein, termed BEN (binding factor for early enhancer). The ORF of BEN encodes a protein of 1072 amino acids and contains six helix-loop-helix domains, a hydrophobic leucine zipper-like motif, and a serine-rich repeat. The murine BEN gene is structurally similar to the human gene TFII-I in that both genes encode unique 95-amino acid long helix-loop/span-helix domains. The BEN gene produces several major transcripts (3.6, 4.4, and 5.9 kb) present in most adult tissues and shows discrete spatial and temporal domains of expression in areas of epithelial-mesenchymal interaction during mouse embryogenesis from E9.5 to E12.5. Several BEN-encoded polypeptides of different sizes ranging from 165 to 40 kDa were identified by Western blot analysis using BEN-specific polyclonal Abs. We propose, on the bases of sequence homology, that BEN is the mouse ortholog of the recently described human gene, WBSCR11, known also as GTF2IRD1, GTF3, Cream1, and MusTRD1. This gene is deleted hemizygously in individuals with Williams Syndrome, an autosomal dominant genetic condition characterized by complex physical, cognitive, and behavioral traits resulting from a perturbed developmental process.

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