A novel Cryptosporidium parvum antigen, CP2, preferentially associates with membranous structures

Steven P. O'Hara, Jae Ran Yu, Jim Jung Ching Lin

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


The present study addresses the cloning and characterization of a Cryptosporidium parvum antigen, CP2. Sequencing of cDNA and genomic clones revealed a novel gene capable of coding a message of 2,136 nucleotides flanked by 28 and 140 nucleotides of the 5′-and 3′-noncoding regions, respectively. The deduced amino acid sequence suggests that CP2 is a secreted and/ or membrane protein. Immunofluorescence microscopy detected CP2 enrichment in sporozoites that subsequently appeared to encase type I meronts in infected HCT-8 cells. Immunogold electron microscopy revealed that CP2 consistently localized to membranous structures throughout development. In addition, progression from macrogametocyte to sporulated oocyst revealed CP2 initially at the periphery of amylopectin-like granules, in the cytoplasm and discrete vesicles, the parasitophorous vacuole, on the surface of sporozoites, and finally on the parasitophorous vacuole membrane (PVM). The observed expression pattern suggests that CP2 may be involved in the invasion process and/or PVM integrity.

Original languageEnglish (US)
Pages (from-to)317-327
Number of pages11
JournalParasitology Research
Issue number4
StatePublished - Mar 2004

ASJC Scopus subject areas

  • Parasitology
  • General Veterinary
  • Insect Science
  • Infectious Diseases


Dive into the research topics of 'A novel Cryptosporidium parvum antigen, CP2, preferentially associates with membranous structures'. Together they form a unique fingerprint.

Cite this