title: Characterization of c-lil, a chicken cellular sequence associated with a stock of B77 avian sarcoma virus.
abstract: Using biochemical methods, we have shown that a new specific sequence, v-lil, is associated with a given stock of B77 avian sarcoma virus (clone 9). We prepared a DNA complementary to v-lil sequences, using substractive hybridizations, and investigated the properties of this sequence. v-lil has a genetic complexity of ca. 2,000 nucleotides and is not present in various stocks of avian sarcoma virus, avian leukosis virus, or defective leukemia virus. v-lil is not associated with B77 avian sarcoma virus isolated from the original tumor and thus has been acquired by in vitro passage of the virus on chicken embryo fibroblasts. A search for the origin of the v-lil sequence among the DNAs of different avian species has shown that a similar sequence, c-lil, is present in normal chicken DNA (1 to 2 copies per haploid genome). c-lil is not highly conserved but is present in the DNA of all chickens from the genus Gallus. The c-lil sequence is transcribed at a low level (1 to 3 copies per cell) in normal chicken embryo fibroblasts. The biological function, if any, of v-lil or its cellular equivalent has yet to be determined.
mesh_terms: D000818:Animals; D001358:Avian Sarcoma Viruses / Q000235:genetics*; D001483:Base Sequence; D001717:Birds / Q000235:genetics; D002478:Cells, Cultured; D002642:Chick Embryo; D002645:Chickens / Q000235:genetics*; D004247:DNA / Q000032:analysis; D004279:DNA, Viral / Q000032:analysis*; D005347:Fibroblasts / Q000032:analysis; D009693:Nucleic Acid Hybridization; D013045:Species Specificity
chemical_list: D004279:DNA, Viral; D004247:DNA