The Saccharomyces cerevisiae genome contains functional and nonfunctional copies of transposon Ty1.
Saccharomyces cerevisiae Ty elements are transposons closely related to retroviruses. The DNA sequence of a functional Ty element (TyH3) is presented. The long terminal repeat sequences are different, suggesting that TyH3 is a recombinant Ty element. A chromosomal Ty element near the LYS2 gene, Ty173, was found to be nonfunctional, even though it has no detectable insertions or deletions. The defect in Ty173 transposition is caused by a missense mutation giving rise to a Leu-to-Ile substitution in the TYB (pol) open reading frame. Several chromosomal Ty elements carry this lesion in their DNA, indicating that nonfunctional Ty elements are common in the yeast genome.
Boeke
J D
JD
Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
Eichinger
D
D
Castrillon
D
D
Fink
G R
GR
D000595:Amino Acid Sequence; D001483:Base Sequence; D004262:DNA Restriction Enzymes; D004251:DNA Transposable Elements; D004271:DNA, Fungal / Q000235:genetics / Q000302:isolation & purification; D005800:Genes, Fungal; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D009710:Nucleotide Mapping; D009838:Oligodeoxyribonucleotides; D010957:Plasmids; D012441:Saccharomyces cerevisiae / Q000235:genetics*
D004251:DNA Transposable Elements; D004271:DNA, Fungal; D009838:Oligodeoxyribonucleotides; D004262:DNA Restriction Enzymes