Abstract
Avian cellular sequences homologous to the ets domain of the avian leukemia retrovirus, E26, have been characterized, and shown to contain nine discrete regions within a single locus of about 60 kb. The structure of the viral homologous and nonhomologous domains of this chicken ets-1 gene is characterized and seen to define the unique amino acid sequences of the ets protein. We have isolated and sequenced an avian ets-1 cDNA clone obtained from chicken thymus. This cDNA clone contains an open reading frame (ORF) encoding the normal cellular product of 441 amino acids. This product is significantly smaller than that encoded by the v- ets domain of the E26 transforming protein, p135, which contains 491 amino acids. The open reading frame predicted by our sequence data results in a protein calculated to be 50 kDa, which is slightly smaller than that actually observed in chicken cells. The presence of termination codons 5′ to this ORF demonstrates that the cDNA characterized contains the entire coding region for the chicken ets gene.
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