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Volume 6, Issue 6

Comparative genomic analysis of three intestinal species reveals reductions in secreted pathogenesis determinants in bovine-specific and non-pathogenic species Open Access

Abstract

The three common intestinal species in cattle differ significantly in host range, pathogenicity and public health significance. While is pathogenic in pre-weaned calves and has a broad host range, and are largely non-pathogenic and bovine-specific species in post-weaned calves. Thus far, only the genome of has been sequenced. To improve our understanding of the genetic determinants of biological differences among spcies, we sequenced the genomes of and and conducted a comparative genomics analysis. The genome of has a gene content and organization more similar to than to other species sequenced to date; the level of similarity in amino acid and nucleotide sequences between the two species is 75.2 and 69.4 %, respectively. A total of 3723 and 3711 putative protein-encoding genes were identified in the genomes of and , respectively, which are fewer than the 3981 in . Metabolism is similar among the three species, although energy production pathways are further reduced in and . Compared with , and have lost 14 genes encoding mucin-type glycoproteins and three for insulinase-like proteases. Other gene gains and losses in the two bovine-specific and non-pathogenic species also involve the secretory pathogenesis determinants (SPDs); they have lost all genes encoding MEDLE, FLGN and SKSR proteins, and two of the three genes for NFDQ proteins, but have more genes encoding secreted WYLE proteins, secreted leucine-rich proteins and GPI-anchored adhesin PGA18. The only major difference between and is in nucleotide metabolism. In addition, half of the highly divergent genes between and encode secreted or membrane-bound proteins. Therefore, and have gene organization and metabolic pathways similar to , but have lost some invasion-associated mucin glycoproteins, insulinase-like proteases, MEDLE secretory proteins and other SPDs. The multiple gene families under positive selection, such as helicase-associated domains, AMP-binding domains, protein kinases, mucins, insulinases and TRAPs could contribute to differences in host specificity and pathogenicity between and . Biological studies should be conducted to assess the contribution of these copy number variations to the narrow host range and reduced pathogenicity of and .

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): comparative genomics , Cryptosporidium bovis , Cryptosporidium ryanae , host specificity and pathogenicity
Funding
This study was supported by the:
  • The 111 Project (Award D2008)
    • Principle Award Recipient: Lihua Xiao
  • National Key R&D Program of China (Award 2017YFD0500404)
    • Principle Award Recipient: Not Applicable
  • National Natural Science Foundation of China (Award 31602042)
    • Principle Award Recipient: Not Applicable
  • National Natural Science Foundation of China (Award 31630078)
    • Principle Award Recipient: Not Applicable
© 2020 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial License.
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2020-05-14
2024-05-19
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Comparative genomic analysis of three intestinal species reveals reductions in secreted pathogenesis determinants in bovine-specific and non-pathogenic Cryptosporidium species
M Gen 6, e000379 (2020); https://doi.org/10.1099/mgen.0.000379
/content/journal/mgen/10.1099/mgen.0.000379
/content/journal/mgen/10.1099/mgen.0.000379
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