Phylogenomics from transcriptomic "bycatch" clarify the origins and diversity of avian trypanosomes in North America.

Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE

Original Publication: San Francisco, CA : Public Library of Science

Transcriptome*; Birds/*genetics ; Trypanosoma/*genetics; Animals ; Bayes Theorem ; Biological Evolution ; Birds/parasitology ; Contig Mapping ; DNA Barcoding, Taxonomic ; DNA, Protozoan/chemistry ; DNA, Protozoan/metabolism ; Databases, Factual ; Haplotypes ; Humans ; North America ; Phylogeny ; RNA, Ribosomal, 18S/chemistry ; RNA, Ribosomal, 18S/classification ; RNA, Ribosomal, 18S/metabolism ; Trypanosoma/classification ; Trypanosoma/pathogenicity ; Trypanosoma cruzi/classification

The eukaryotic blood parasite genus Trypanosoma includes several important pathogens of humans and livestock, but has been understudied in wildlife broadly. The trypanosomes that infect birds are in particular need of increased attention, as these parasites are abundant and globally distributed, yet few studies have addressed their evolutionary origins and diversity using modern molecular and analytical approaches. Of specific interest are the deep evolutionary relationships of the avian trypanosomes relative to the trypanosome species that are pathogenic in humans, as well as their species level diversity in regions where they have been understudied such as North America. Here, we address these unresolved areas of study using phylogenomic data for two species of avian trypanosomes that were isolated as "bycatch" from host transcriptome assemblies, as well as a large 18S DNA barcode sequence dataset that includes 143 novel avian Trypanosoma 18S sequences from North America. Using a phylogenomic approach, we find that the avian trypanosomes are nested within a clade of primarily mammalian trypanosomes that includes the human pathogen Trypanosoma cruzi, and are paraphyletic with respect to the ruminant trypanosome Trypanosoma theileri. DNA barcode sequences showed that T. avium and an unidentified small, non-striated trypanosome that was morphologically similar to T. everetti are each represented by highly abundant and divergent 18S haplotypes in North America. Community-level sampling revealed that additional species-level Trypanosoma lineages exist in this region. We compared the newly sequenced DNA barcodes from North America to a global database, and found that avian Trypanosoma 18S haplotypes generally exhibited a marked lack of host specificity with at least one T. avium haplotype having an intercontinental distribution. This highly abundant T. avium haplotype appears to have a remarkably high dispersal ability and cosmopolitan capacity to evade avian host immune defenses, which warrant further study.
Competing Interests: The authors have declared that no competing interests exist.

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figshare 10.6084/m9.figshare.12869966

0 (DNA, Protozoan)
0 (RNA, Ribosomal, 18S)

Date Created: 20201008 Date Completed: 20201201 Latest Revision: 20201201

20240105

PMC7544035

10.1371/journal.pone.0240062

33031471