The tko locus, site of a behavioral mutation in D. melanogaster, codes for a protein homologous to prokaryotic ribosomal protein S12

Cell. 1987 Oct 23;51(2):165-73. doi: 10.1016/0092-8674(87)90144-9.


The tko (technical knockout) mutation is one of a family of behavioral mutations that cause "bang sensitivity" in D. melanogaster. Using P-element-mediated transformation, we show that a 3.1 kb piece of genomic DNA complements tko. This fragment contains only one complete transcript, 0.68 kb in length. This transcript is abundantly expressed through all stages of the life cycle, and we have isolated cDNAs corresponding to this transcript. Their sequence implies a protein product composed of 140 amino acids, which exhibits considerable sequence similarity to ribosomal protein S12 from both Euglena gracilis chloroplasts and E. coli. We suggest that tko codes for a mitochondrial ribosomal protein and that the tko phenotype results from defective mitochondria.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Behavior, Animal / physiology*
  • Chromosome Mapping*
  • DNA / genetics
  • DNA / isolation & purification
  • Drosophila melanogaster / genetics*
  • Genetic Code*
  • Molecular Sequence Data
  • Mutation*
  • Ribosomal Proteins / genetics*
  • Sequence Homology, Nucleic Acid
  • Transcription, Genetic
  • Transformation, Genetic


  • Ribosomal Proteins
  • ribosomal protein S12
  • DNA

Associated data

  • GENBANK/M19494