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Identification of porcine Pneumocystis carinii as a genetically distinct organism by DNA amplification
A E Wakefield1, S P Keely, J R Stringer
1Department of Paediatrics, John Radcliffe Hospital, Oxford, UK.
Abstract:
DNA was amplified from lung samples from three piglets infected with Pneumocystis carinii, using oligonucleotide primers designed to the P. carinii mitochondrial large subunit ribosomal RNA gene. The nucleotide sequence of the amplification product was determined and indicated lack of sequence variation among these pig-derived P. carinii samples at this locus. The data showed that porcine P. carinii was genetically distinct from P. carinii isolated from other mammalian host species.
Insights
Pneumocystis carinii in piglets shows no genetic variation in a key mitochondrial gene. This finding indicates that pig-derived Pneumocystis carinii is genetically distinct from strains found in other mammals.
Area of Science:
- Molecular Biology
- Mycology
- Veterinary Science
Background:
- Pneumocystis carinii is an opportunistic pathogen causing pneumonia in various mammals.
- Understanding host-specific genetic variations in P. carinii is crucial for diagnostics and treatment.
Purpose of the Study:
- To genetically characterize Pneumocystis carinii isolated from infected piglets.
- To determine if porcine P. carinii exhibits genetic variation at the mitochondrial large subunit ribosomal RNA gene locus.
Main Methods:
- DNA extraction from lung samples of experimentally infected piglets.
- Polymerase chain reaction (PCR) amplification of the P. carinii mitochondrial large subunit ribosomal RNA gene.
- Nucleotide sequencing of the amplified DNA fragments.
Main Results:
- Amplification and sequencing of the target gene were successful for all pig-derived P. carinii samples.
- No sequence variation was observed among the P. carinii isolates from the three piglets at this specific genetic locus.
- Comparative analysis revealed significant genetic distinctness between porcine P. carinii and isolates from other mammalian hosts.
Conclusions:
- Porcine Pneumocystis carinii populations appear genetically conserved at the mitochondrial large subunit ribosomal RNA gene.
- The genetic data supports the classification of porcine P. carinii as a distinct lineage, separate from P. carinii found in other mammals.