Virus-like particles in Blastocystis sp. from simian faecal material

Area of Science:

• Microbiology
• Virology
• Primatology

Background:

• Blastocystis is a common intestinal protozoan parasite found in humans and animals.
• The presence and nature of virus-like particles (VLPs) within Blastocystis have been poorly understood.
• Understanding VLPs in Blastocystis could offer insights into parasite biology and host-parasite interactions.

Purpose of the Study:

• To investigate the presence and morphology of virus-like particles within Blastocystis sp. from non-human primates.
• To document the initial in situ observation of VLPs in Blastocystis.

Main Methods:

• Faecal samples from two Macaca fascicularis monkeys were analyzed.
• Transmission electron microscopy (TEM) was employed to examine the ultrastructure of Blastocystis.
• Morphological characteristics of observed particles were recorded.

Main Results:

• Virus-like particles were identified within the cytoplasm of Blastocystis sp.
• Two distinct morphological types of VLPs were observed.
• Particle type 1 measured approximately 55-60 nm in diameter with a 30 nm core.
• Particle type 2 measured approximately 200 nm in diameter with a 100 nm core.

Conclusions:

• This study provides the first report of in situ virus-like particles in Blastocystis.
• The findings suggest the presence of potentially novel viral agents or endogenous viral elements within Blastocystis.
• Further research is warranted to characterize these VLPs and their biological significance.