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RNA homology and the reclassification of Pneumocystis
J K Frenkel1, M S Bartlett, J W Smith
1Department of Pathology, University of Kansas Medical Center, Kansas City 66103.
Abstract:
The identification of sequence similarities in ribosome RNA subunits from Pneumocystis and certain fungi has led to the suggestion that this presumed protozoan be reclassified as a fungus. However, the absence of predictable characteristics from the fungi as a group to Pneumocystis as a genus indicates that we should wait until additional rRNA coding sequences of more organisms have been compared.
Insights
Sequence similarities in Pneumocystis and fungi suggest reclassification. However, more ribosomal RNA (rRNA) sequence comparisons are needed to confirm if Pneumocystis is a fungus.
Area of Science:
- Microbiology
- Mycology
- Molecular Biology
Background:
- Pneumocystis has historically been classified as a protozoan.
- Recent findings show sequence similarities between Pneumocystis and fungal ribosome RNA (rRNA) subunits.
- These similarities have prompted suggestions to reclassify Pneumocystis as a fungus.
Purpose of the Study:
- To evaluate the evidence for reclassifying Pneumocystis from a protozoan to a fungus based on rRNA sequence data.
- To determine if current data is sufficient for taxonomic revision.
Main Methods:
- Comparative analysis of ribosome RNA (rRNA) gene sequences.
- Identification of sequence similarities between Pneumocystis and fungal rRNA.
- Assessment of characteristic fungal traits within the Pneumocystis genus.
Main Results:
- Sequence similarities were identified between Pneumocystis rRNA subunits and those of certain fungi.
- However, Pneumocystis lacks other defining characteristics common to the fungal group.
- The current data suggests incomplete evidence for fungal classification.
Conclusions:
- While rRNA similarities suggest a fungal relationship, further comparative analysis is required.
- Additional rRNA coding sequences from a wider range of organisms are necessary for a definitive reclassification.
- Current evidence does not conclusively support reclassifying Pneumocystis as a fungus.