Molecular Characterization of Sarcocystis Infections in Animal Hosts

Molecular approaches have transformed our understanding of Sarcocystis infections in animals by enabling precise species identification, elucidating life‐cycle dynamics and uncovering pathogenic mechanisms across diverse hosts. Sarcocystis spp. are intracellular protozoan parasites with complex two‐host lifecycles: herbivorous or omnivorous intermediate hosts harbour sarcocysts within striated muscle and neural tissue, while carnivorous definitive hosts shed sporocysts via faeces. Molecular markers such as the nuclear 18S rRNA gene, the ITS1 region and mitochondrial cox1 gene have proven indispensable for phylogenetic resolution and discrimination among cryptic species complexes. High‐throughput sequencing and sensitive PCR assays now enable detection of mixed infections and low‐abundance zoonotic species in livestock, wildlife and companion animals, informing risk assessment for food safety and public health. Proteomic analyses, notably of parasite proteases, are pinpointing molecular drivers of tissue invasion and persistence, offering new targets for chemotherapeutics and vaccine development. Together, these advances underpin integrated surveillance programmes, enhance diagnostic accuracy in abattoirs and facilitate studies of host–parasite co‐evolution, thereby addressing economic impacts in agriculture and mitigating zoonotic threats worldwide.

Research from Nature Portfolio

Recent studies have targeted the biochemical and molecular features of proteases central to Sarcocystis survival. In a recent investigation of water buffalo infections, a 100 kDa cysteine protease was purified from cysts of Sarcocystis fusiformis. Biochemical characterisation revealed its optimal activity at mild acidity and elevated temperature, and complete inhibition by cysteine‐targeting molecules. Sequence analyses confirmed the enzyme’s resemblance to known apicomplexan proteases, indicating its key role in tissue invasion and parasite persistence. This work underscores proteases as promising targets for vaccine and drug design, linking molecular characterisation to translational control strategies.

Molecular Characterization of Sarcocystis Infections in Animal Hosts publication trend

The graph below shows the total number of articles in molecular characterization of sarcocystis infections in animal hosts across all publications each year (not limited to Nature Index journals).

Technical terms

Internal transcribed spacer 1 (ITS1): A non‐coding nuclear DNA region between ribosomal RNA genes used for species‐level discrimination.

18S ribosomal RNA (18S rRNA): A conserved component of the small subunit of eukaryotic ribosomes employed in phylogenetic analyses.

Cytochrome c oxidase subunit I (COX1): A mitochondrial gene frequently used as a barcoding marker for genetic identification.

Cysteine protease: An enzyme that uses a catalytic cysteine residue to cleave peptide bonds, often implicated in parasite invasion.

Sarcocyst: A microscopic, intracellular cyst containing bradyzoites of Sarcocystis species in an intermediate host’s muscle or neural tissue.

Intermediate host: The organism in which a parasite undergoes asexual development before transmission to its definitive host.

References

1. Purification and characterization of cysteine protease of Sarcocystis fusiformis from infected Egyptian water buffaloes. Scientific Reports (2023).
2. A cyst-forming coccidian with large geographical range infecting forest and commensal rodents: Sarcocystis muricoelognathis sp. nov.. Parasites & Vectors (2024).
3. Molecular detection of cattle Sarcocystis spp. in North-West Italy highlights their association with bovine eosinophilic myositis. Parasites & Vectors (2021).
4. Molecular identification of four Sarcocystis species in cattle from Lithuania, including S. hominis, and development of a rapid molecular detection method. Parasites & Vectors (2020).