title: Adenovirus E1A gene autorepression: revertants of an E1A promoter mutation encode altered E1A proteins.
abstract: Revertants have been isolated from Ad3hr15, a mutant of human adenovirus type 3 that carries a defective E1A promoter. Transcription of these revertant E1A genes is restored--from nil for Ad3hr15 mutant to levels exceeding that of the wild-type virus. The mutant Ad3hr15 virus and the revertants all have an aberrant E1A promoter that contains two short tandem duplications of viral DNA sequence. The E1A gene-coding region of the mutant is the same as that for wild-type adenovirus type 3, whereas the revertants are characterized by short in-frame deletions within the 5' exon region of their E1A genes. Location of these reverting, second-site deletions is discussed in relation to E1A gene autoregulation and the evolved diversity of E1A-related oncogenic potential among different human adenoviruses.
mesh_terms: D017456:Adenovirus Early Proteins; D000260:Adenoviruses, Human / Q000235:genetics*; D001483:Base Sequence; D002874:Chromosome Mapping; D004252:DNA Mutational Analysis; D005786:Gene Expression Regulation; D005814:Genes, Viral; D008969:Molecular Sequence Data; D009856:Oncogene Proteins, Viral / Q000235:genetics*; D011401:Promoter Regions, Genetic; D012045:Regulatory Sequences, Nucleic Acid; D014158:Transcription, Genetic; D014779:Virus Replication
chemical_list: D017456:Adenovirus Early Proteins; D009856:Oncogene Proteins, Viral