title: Complementary DNA clones of chicken proto-oncogene c-ets: sequence divergence from the viral oncogene v-ets.
abstract: The avian acute leukemia virus E26 induces erythroblastosis and myeloblastosis in chickens. The oncogene of this virus includes sequences derived from the cellular gene designated c-ets, which is normally expressed in lymphoid cells and whose product is a protein of apparent molecular weight ca. 54,000 daltons. Complementary DNA clones representing the major transcript of the chicken c-ets proto-oncogene were isolated from a spleen cell library. Sequence analysis of the cDNA revealed that it contains an open reading frame encoding a polypeptide of 441 amino acids with a molecular weight of 49,932 daltons. This open reading frame can be transcribed and translated in vitro into a 50 kd protein that is specifically immunoprecipitated with antiserum to the v-ets oncogene product. Within the central region of homology between c-ets and v-ets, there are only 5 nucleotide substitutions resulting in 4 amino acid changes. However, coding sequences at the 5' and 3' ends of the v-ets oncogene and the chicken c-ets cDNA differ from one another. These changes may be responsible for the differential functions of c-ets and v-ets in cells of different hematopoietic lineages and may account for the pathogenic properties of the v-ets oncogene.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002645:Chickens / Q000235:genetics*; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D007158:Immunologic Techniques; D008969:Molecular Sequence Data; D009856:Oncogene Proteins, Viral / Q000235:genetics*; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D011519:Proto-Oncogenes; D012333:RNA, Messenger / Q000235:genetics
chemical_list: D009856:Oncogene Proteins, Viral; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D004247:DNA