A Database of Expressed Genes From Cochliomyia hominivorax (Diptera Calliphoridae)

F. D. Guerrero*, S. E. Down, A. Djikeng, G. Wiley, S. Macmil, L. Saldivar, F. Najar, B. A. Roe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We used an expressed sequence tag and 454 pyrosequencing approach to initiate a study of the genome of the screwworm, Cochliomyia hominivorax (Coquerel) (Diptera: Calliphoridae). Two normalized cDNA libraries were constructed from RNA isolated from embryos and second instar larvae from the Panama 95 strain. Approximately 5,400 clones from each library were sequenced from both the 5' and 3' directions using the Sanger method. In addition, double-stranded cDNA was prepared from random-primed poly A RNA purified from embryos, second-instar larvae, adult males, and adult females. These four cDNA samples were used for 454 pyrosequencing that produced approximate to 300,000 independent sequences. Sequences were assembled into a database of assembled contigs and singletons and used to search public protein databases and annotate the sequences. The full database consists of 6,076 contigs and 58,221 singletons assembled from both the traditional expressed sequence tag (EST) and 454 sequences. Annotation of the data led to the identification of several gene coding regions with possible roles in sex determination in the screwworm. This database will facilitate the design of inicroarray and other experiments to study screwworm gene expression on a larger scale than previously possible.

Original languageEnglish
Pages (from-to)1109-1116
Number of pages8
JournalJournal of medical entomology
Issue number5
Publication statusPublished - Sep 2009


  • Cochliomyia hominivorax
  • expressed sequence tags
  • 454 pyrosequencing
  • sex-lethal
  • gene ontology terms

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