1887

Abstract

The genome of contains a relatively small number of introns, which includes the -tubulin gene with only a single intron. Recently, it was observed that the intron was not removed from some of the -tubulin transcripts in the late life cycle stages cultured . Although normally spliced -tubulin mRNA was detected in all parasite intracellular stages by RT-PCR (e.g. HCT-8 or Caco-2 cells infected with for 12–72 h), at 48–72 h post-infection unprocessed -tubulin transcripts containing intact introns started to appear in parasite mRNA within infected host cells. The intron-containing transcripts could be detected by fluorescence hybridization (FISH) using an intron-specific probe. The intron-containing -tubulin transcripts appeared unique to the -cultured , since they were not detected in parasite-infected calves at 72 h. As yet, it is unclear whether the late life cycle stages of are partially deficient in intron-splicing or the intron-splicing processes have merely slowed, both of which would allow the detection of intron-containing transcripts. Another possible explanation is that the decay in transcript processing might simply be due to the onset of parasite death. Nonetheless, the appearance of intron-containing transcripts coincides with the arrest of development . This unusual observation prompts speculation that the abnormal intron-splicing of -tubulin transcripts may be one of the factors preventing complete development of this parasite . Furthermore, the presence of both processed and unprocessed introns in -tubulin transcripts may provide a venue for studying overall mechanisms for intron-splicing in this parasite.

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2004-05-01
2021-10-23
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References

  1. Abrahamsen M. S., Schroeder A. A. 1999; Characterization of intracellular Cryptosporidium parvum gene expression. Mol Biochem Parasitol 104:141–146 [CrossRef]
    [Google Scholar]
  2. Arrowood M. J. 2002; In vitro cultivation of Cryptosporidium species. Clin Microbiol Rev 15:390–400 [CrossRef]
    [Google Scholar]
  3. Bankier A. T., Spriggs H. F., Fartmann B., Konfortov B. A., Madera M., Vogel C., Teichmann S. A., Ivens A., Dear P. H. 2003; Integrated mapping, chromosomal sequencing and sequence analysis of Cryptosporidium parvum. Genome Res 13:1787–1799
    [Google Scholar]
  4. Caccio S., La Rosa G., Pozio E. 1997; The beta-tubulin gene of Cryptosporidium parvum. Mol Biochem Parasitol 89:307–311 [CrossRef]
    [Google Scholar]
  5. Deng M., Templeton T. J., London N. R., Bauer C., Schroeder A. A., Abrahamsen M. S. 2002; Cryptosporidium parvum genes containing thrombospondin type 1 domains. Infect Immun 70:6987–6995 [CrossRef]
    [Google Scholar]
  6. Fayer R., Speer C. A., Dubey J. P. 1997; The general biology of Cryptosporidium. In Cryptosporidium and Cryptosporidiosis pp. 1–42 Edited by Fayer R. Boca Raton, FL: CRC Press;
    [Google Scholar]
  7. Hijjawi N. S., Meloni B. P., Morgan U. M., Thompson R. C. 2001; Complete development and long-term maintenance of Cryptosporidium parvum human and cattle genotypes in cell culture. Int J Parasitol 31:1048–1055 [CrossRef]
    [Google Scholar]
  8. Okhuysen P. C., Chappell C. L. 2002; Cryptosporidium virulence determinants – are we there yet?. Int J Parasitol 32:517–525 [CrossRef]
    [Google Scholar]
  9. Tzipori S., Widmer G. 2000; The biology of Cryptosporidium. Contrib Microbiol 6:1–32
    [Google Scholar]
  10. Upton S. J. 1997; In vitro cultivation. In Cryptosporidium and Cryptosporidiosis pp.. 181–208Edited by Fayer R. Boca Raton, FL: CRC Press;
    [Google Scholar]
  11. Upton S. J., Tilley M., Brillhart D. B. 1995; Effects of select medium supplements on in vitro development of Cryptosporidium parvum in HCT-8 cells. J Clin Microbiol 33:371–375
    [Google Scholar]
  12. Yang S., Healey M. C., Du C., Zhang J. 1996; Complete development of Cryptosporidium parvum in bovine fallopian tube epithelial cells. Infect Immun 64:349–354
    [Google Scholar]
  13. Zhu G., Keithly J. S. 1997; Molecular analysis of a P-type ATPase from Cryptosporidium parvum. Mol Biochem Parasitol 90:307–316 [CrossRef]
    [Google Scholar]
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