Development of a gp60-subtyping method for Cryptosporidium felis

Area of Science:

• Veterinary Parasitology
• Molecular Epidemiology
• Genomic Analysis

Background:

• Feline cryptosporidiosis is a growing concern, particularly in catteries.
• While human infection risk from Cryptosporidium felis is low, cat-to-human transmission is possible.
• Previous genotyping of C. felis relied on less discriminatory markers like 18S rRNA, COWP, and HSP70.

Purpose of the Study:

• To identify and characterize the gp60 gene in Cryptosporidium felis.
• To develop a new molecular marker for subtyping C. felis isolates.
• To investigate the genetic diversity and transmission dynamics of C. felis.

Main Methods:

• Identified the gp60 orthologue in the C. felis genome.
• Designed a nested PCR assay targeting the C. felis gp60 gene.
• Evaluated the marker using 128 clinical isolates of feline and human origin.

Main Results:

• The C. felis gp60 gene exhibits significant sequence variation.
• Unlike other orthologues, C. felis gp60 lacks a serine-tract and has a variable insertion.
• Successfully confirmed two instances of zoonotic transmission of C. felis from cats to humans.

Conclusions:

• The gp60 gene has been identified in C. felis.
• This highly variable marker is effective for epidemiological studies of feline cryptosporidiosis.
• The findings enhance our ability to track C. felis transmission dynamics.