Structure and identity of a late-replicating and transcriptionally active gene.
Eukaryotic genes are usually replicated early during S-phase in the cell lineages in which they are expressed. Using partially characterized cDNA probes, we recently established two exceptions to this rule in the slime mold Physarum polycephalum. In this paper, we analyzed the structure and the identity of one of these two genes. By genomic cloning and Southern analysis we demonstrate that it is a single-copy gene and decipher the structure of the two alleles by taking advantage of a restriction fragment length polymorphism. By cDNA cloning and sequencing, we deduced the amino acid coding capacity of the mRNA. Finally, we confirmed the late replication of this abundantly expressed gene by "gene dosage" analysis, an experiment that did not require any drug treatment of the cell. Our results provide for the characterization and the structure of the first developmentally regulated gene known to be replicated late in S-phase and abundantly expressed within a eukaryotic cell.
Laboratoire de Biologie, UPR 272-CNRS, Villejuif, France.
M
M
Benard
D
D
Pallotta
G
G
Pierron
D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004261:DNA Replication; D005800:Genes, Fungal; D008969:Molecular Sequence Data; D016839:Physarum polycephalum / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length; D012333:RNA, Messenger / Q000032:analysis; D016196:S Phase / Q000235:genetics
D012333:RNA, Messenger