title: Sequence determination of cDNA clones of transcripts from the tumor-associated region of the Marek's disease virus genome.
abstract: The number of 132-bp tandem direct repeats within the long inverted repeat region of the Marek's disease virus type 1 (MDV1) genome increases concomitantly with the loss of oncogenicity during serial passages in cultured cells. Twelve clones carrying the 132-bp sequence were isolated from a cDNA library constructed from chicken embryo fibroblasts infected with the MDV1 Md5 strain. Through sequence analysis of a cDNA clone and primer extension analysis, the corresponding mRNA was found to be a linear transcript which included the two 132-bp tandem direct repeats. Two open reading frames were found in this transcript. One had a week homology with v-fms. The other should increase its size concomitantly with expansion of the 132-bp tandem direct repeat. PCR analysis of both cDNA clones and RNA gave amplified products which were as large as that produced from the genomic clone, indicating that a majority of mRNA from this region is composed of unspliced transcripts.
authors.affiliation: Nippon Institute for Biological Science, Tokyo, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Iwata
authors.forename: S
authors.initials: S
authors.lastname: Ueda
authors.forename: A
authors.initials: A
authors.lastname: Ishihama
authors.forename: K
authors.initials: K
authors.lastname: Hirai
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D005814:Genes, Viral; D008381:Herpesvirus 2, Gallid / Q000235:genetics*; D008969:Molecular Sequence Data; D009857:Oncogenes; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics; D012367:RNA, Viral / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000235:genetics*; D015678:Viral Structural Proteins / Q000235:genetics
chemical_list: D012333:RNA, Messenger; D012367:RNA, Viral; D014764:Viral Proteins; D015678:Viral Structural Proteins; D004247:DNA