Padlock probes: circularizing oligonucleotides for localized DNA detection

Science. 1994 Sep 30;265(5181):2085-8. doi: 10.1126/science.7522346.


Nucleotide sequence information derived from DNA segments of the human and other genomes is accumulating rapidly. However, it frequently proves difficult to use such short DNA segments to identify clones in genomic libraries or fragments in blots of the whole genome or for in situ analysis of chromosomes. Oligonucleotide probes, consisting of two target-complementary segments, connected by a linker sequence, were designed. Upon recognition of the specific nucleic acid molecule the ends of the probes were joined through the action of a ligase, creating circular DNA molecules catenated to the target sequence. These probes thus provide highly specific detection with minimal background.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Cells, Cultured
  • Chromosomes, Human, Pair 12
  • Cystic Fibrosis Transmembrane Conductance Regulator
  • DNA / analysis*
  • DNA, Circular / analysis*
  • Genetic Vectors
  • Humans
  • In Situ Hybridization
  • Lymphocytes
  • Membrane Proteins / genetics
  • Models, Molecular
  • Molecular Sequence Data
  • Nucleic Acid Conformation
  • Oligonucleotide Probes* / chemistry
  • Repetitive Sequences, Nucleic Acid
  • Templates, Genetic


  • CFTR protein, human
  • DNA, Circular
  • Membrane Proteins
  • Oligonucleotide Probes
  • Cystic Fibrosis Transmembrane Conductance Regulator
  • DNA