ORF-FINDER: A vector for high-throughput gene identification

Irene T. Rombel, Kathryn F. Sykes, Simon Rayner, Stephen Albert Johnston

Research output: Contribution to journalArticlepeer-review

273 Scopus citations


We have developed a simple and efficient system (ORF-FINDER) for selecting open reading frames (ORFs) from randomly fragmented genomic DNA fragments. The ORF-FINDER vectors are plasmids that contain a translational start site out of frame with respect to the gene for green fluorescent protein (GFP). Insertion of DNA fragments that bring the initiating ATG in frame with GFP and that contain no stop codons (that is, ORFs) results in the expression of ORF-GFP fusion proteins. In addition, we have developed software (GeneWorks and GenomeAnalyzer) to predict the optimal insert size for maximizing the number of gene-coding ORFs and minimizing unintentionally selected non-coding ORFs. To demonstrate the feasibility of using the ORF-FINDER system to screen genomes for ORFs, we cloned yeast genomic DNA and succeeded in enriching for ORFs by 25-fold. Furthermore, we have shown that the vector can effectively isolate ORFs from the more complex genomes of eukaryotic parasites. We envision that ORF-FINDER will have several applications including genome sequencing projects, gene building from oligonucleotides and construction of expression libraries enriched for ORFs.

Original languageEnglish (US)
Pages (from-to)33-41
Number of pages9
Issue number1-2
StatePublished - Jan 9 2002
Externally publishedYes


  • Expression library immunization
  • Functional genomic screen
  • Open reading frame
  • Open reading frame selection vector
  • Parasite

ASJC Scopus subject areas

  • Genetics


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