PreprintCited by 4Trypanosoma species research and implicationsVector-borne infectious diseasesAnimal health and immunology

Functional genomics of trypanotolerant and trypanosusceptible cattle infected with Trypanosoma congolense across multiple time points and tissues

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McHugo, Gillian P., Ward, James A., Browne, John A., O’Gorman, Grace M., Meade, Kieran G., Hill, Emmeline W., Hall, Thomas J., MacHugh, David E.·2025·PLoS neglected tropical diseases

Abstract

Human African trypanosomiasis (HAT), or sleeping sickness, is a neglected tropical disease caused by infection with trypanosome parasites ( Trypanosoma spp.). These are transmitted by infected tsetse flies ( Glossina spp.) and cause a similar disease in animals, known as African animal trypanosomiasis (AAT). AAT is one of the largest constraints to livestock production in sub-Saharan Africa and causes a financial burden of approximately $4.5 billion annually. Some African Bos taurus cattle populations have an important evolutionary adaptation known as trypanotolerance, a genetically determined tolerance of infection by trypanosome parasites ( Trypanosoma spp.). Trypanotolerant African B. taurus N’Dama and trypanosusceptible Bos indicus Boran cattle responded in largely similar ways during trypanosome infection when gene expression was examined using blood, liver, lymph node, and spleen samples with peaks and troughs of gene expression differences following the cyclic pattern of parasitaemia exhibited during trypanosome infection. However, differences in response to infection between the two breeds were reflected in differential expression of genes related to the immune system such as those encoding antimicrobial peptides and cytokines, including, for example, the antimicrobial peptide encoding genes LEAP2 , CATHL3 , DEFB4A , and S100A7 and the cytokine genes CCL20 , CXCL11 , CXCL13 , CXCL16 , CXCL17 , IL33 , and TNFSF13B . In addition, transcriptional profiling of peripheral blood identified expression differences in genes relating to coagulation and iron homeostasis, which supports the hypothesis that the dual control of parasitaemia and the anaemia resulting from the innate immune response to trypanosome parasites is key to trypanotolerance and provide new insights into the molecular mechanisms underlying this phenomenon. Author Summary: Trypanosome parasites are transmitted by infected tsetse flies and cause the neglected tropical disease human African trypanosomiasis (HAT) and the similar African animal trypanosomiasis (AAT), which is one of the largest impediments to livestock production in sub-Saharan Africa. Taurine ( Bos taurus ) and indicine ( Bos indicus ) cattle shared a common ancestor more than 150,000 years ago, and in the intervening period significant genomic differences have evolved between the two groups. Importantly, several African B. taurus populations have evolved an adaptation known as trypanotolerance, a genetically determined tolerance of infection by trypanosome parasites. Trypanotolerant African taurine and trypanosusceptible indicine cattle responded in largely similar ways during trypanosome infection when gene expression was examined using blood, liver, lymph node, and spleen samples with peaks and troughs of gene expression differences following the cyclic pattern of the number of trypanosome parasites in the blood. Transcriptional profiling of these tissues highlighted genes related to the multiple facets of the immune system; notably, for peripheral blood, differences observed for genes relating to coagulation and iron homeostasis support the existing hypothesis that control of both parasite number and anaemia is an important feature of the trypanotolerance trait and provide new insights into the molecular mechanisms underlying this phenomenon.

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  • The dual capacity to control both parasitaemia and the anemia resulting from the innate immune response is key to trypanotolerance.

    “These findings support the hypothesis that the dual capacity to control both parasitaemia and the anemia resulting from the innate immune response is key to trypanotolerance [123].”

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Authors
McHugo, G. P., Ward, J. A., Browne, J. A., O’Gorman, G. M., Meade, K. G., Hill, E. W., Hall, T. J., & MacHugh, D. E.
Affiliations
  • University College Dublin (IE)
  • UK Agri-Tech Centre, Innovation Centre, York Science Park, York, UK
Corresponding author
MacHugh, David E.
Venue
PLoS neglected tropical diseases
Publisher
openRxiv
Published
2025-01-31
Volume
19
Issue
8
Pages
e0012882-e0012882
ISSN
1935-2727 (ISSN-L)
OpenAlex
W4412932781
Cited by
4
References
151
Citations by year
2026: 3 · 2025: 1
FWCI
2.75
Type
journal article
Language
en
Open access
Locations
  • PLoS neglected tropical diseases (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Science Foundation Ireland (SFI/15/IA/3154, SFI/18/CRT/6214, SFI/01/F.1/B028)
Topics
  • Health Sciences › Medicine › Epidemiology › Trypanosoma species research and implications
  • Life Sciences › Immunology and Microbiology › Parasitology › Vector-borne infectious diseases
  • Health Sciences › Veterinary › Small Animals › Animal health and immunology
Keywords
trypanotolerance, Trypanosoma congolense, African animal trypanosomosis, cattle, N'Dama cattle, Boran cattle, gene expression profiling, immune response, antimicrobial peptides, cytokines, parasitemia, anemia, iron homeostasis, coagulation, innate immunity
MeSH terms
Animals, Cattle, Cattle Diseases, Trypanosoma congolense, Trypanosomiasis, African, Gene Expression Profiling, Genomics

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