Molecular characterization of Blastocystis isolates from primates

Area of Science:

• * Microbiology and Molecular Biology
• * Parasitology

Background:

• * Blastocystis is a common intestinal protozoan parasite found in humans and various animals.
• * Understanding the genetic diversity and host range of Blastocystis is crucial for public health and epidemiology.

Purpose of the Study:

• * To genetically characterize Blastocystis isolates from primate hosts.
• * To compare primate Blastocystis genotypes with those found in humans, particularly Blastocystis hominis.
• * To investigate the potential zoonotic transmission of Blastocystis between primates and humans.

Main Methods:

• * Polymerase chain reaction (PCR) using diagnostic primers.
• * PCR-restriction fragment length polymorphism (RFLP) analysis of the small subunit ribosomal DNA (SSUrDNA).

Main Results:

• * Two distinct genotypes were identified: subtype 1 (found in 2 isolates) and a variant of subtype 1 (found in 6 isolates).
• * The subtype 1 isolates matched ribodeme 1, while the variant subtype 1 isolates differed from previously reported human variants.
• * Four isolates did not amplify with diagnostic primers; three showed RFLP profiles consistent with ribodeme 6.

Conclusions:

• * This is the first genomic analysis of Blastocystis from primates, showing genetic similarities to Blastocystis hominis genotypes.
• * The zoonotic status of these primate Blastocystis isolates remains undetermined.
• * Further phylogenetic studies are required to elucidate the relationships between primate isolates and diverse Blastocystis hominis genotypes.