Microbial Identification Using Mass Spectrometry
Author Information
Author(s): Zhang Zhengdong, Jackson George W, Fox George E, Willson Richard C
Primary Institution: University of Houston
Hypothesis
There is sufficient discriminatory power in base-specific rRNA fragment compositions alone for identification of known and previously-unknown organisms.
Conclusion
Mass catalogs of RNase-generated fragments of 16S rRNA are extremely promising for determining the genetic affinity of unknown bacteria.
Supporting Evidence
- 140 strains out of 1,921 organisms (7.3%) could be identified by the presence of a unique RNase T1-generated oligoribonucleotide mass.
- Combinations of just two and three oligoribonucleotide masses allowed 54% and 72% of the specific strains to be identified, respectively.
- The method is particularly useful for identifying multiple species in mixtures.
Takeaway
Scientists can identify bacteria by looking at the unique sizes of pieces of their genetic material, which can be measured using a special machine called a mass spectrometer.
Methodology
The study used mass spectrometry to analyze oligoribonucleotides generated from the digestion of 16S rRNA sequences by RNase T1 and RNase A.
Limitations
The method may not distinguish between closely related strains of the same species due to identical mass compositions.
Digital Object Identifier (DOI)
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