Pristionchus pacificus

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Pristionchus pacificus is a self-fertilising hermaphrodite nematode of the Diplogastridae family. One of the main differences to C.elegans are the pre-hatching embryonic molt stages. Also of note is the dimorphism of stoma structures in Pristionchus pacificus. The lifecycle is 4-days at 20 degrees Celcius.


Closely related species Pristionchus maupasi and Pristionchus entomorphus naturally occur in close association with Scarabaeidae and Chrysomelidae. Pristionchus pacificus was so far not observed in isolates from scarab or potato beetles. The laboratory strain PS312 used for the genome sequencing was isolated in Pasadena (California) and is available at the CGC strain collection.

Selected Publications

  • Ralf J. Sommer (2005): [Pristionchus pacificus.] WormBook
  • Ralf J. Sommer (2005): [Evolution of development in nematodes related to C. elegans.] WormBook
  • Mayer WE , Herrmann M , Sommer RJ(2007): Phylogeny of the nematode genus Pristionchus and implications for biodiversity, biogeography and the evolution of hermaphroditism. BMC Evol Biol 7:104 (WBPaper00030826)
  • Zheng, M., Messerschmidt, D., Jungblut, B. and Sommer, R. J. (2005): Conservation and diversification of Wnt signaling function during the evolution of nematode vulva development. Nature Genetics 37, 300-304 (WBPaper00025001)

Main Labs

WormBase Ressources

will be available with WormBase WS194

  • GBrowse
  • Genome Sequence (masked | unmasked | softmasked)
  • Gene Models and Annotation (based on SNAP predictions from MPI-Developmental Biology)
  • Pristionchus WormBase pages (including Orthologs / WGN/CGC-names)
  • gene model corrections can be submitted to or through the feedback links
  • whole genome alignments

Web Ressources

  • [] page of the Max-Planck-Institute for Developmental Biology (including sequence retrieval / blast / Genome Browser)
  • [genome assembly] at Washington University
  • [WikiOnchus] Pristionchus Wiki (including the beginner's guide to the Pristionchus universe)