Related Experiment Video
Updated: Aug 16, 2026
Combined Recombinase Polymerase Amplification CRISPR/Cas12a Assay for Detecting Fusarium oxysporum f. sp. cubense Tropical Race 4
Published on: November 14, 2025
A simple polymerase chain reaction/restriction fragment length polymorphism assay capable of identifying medically
Timothy R Dean1, Michael Kohan, Doris Betancourt
1National Risk Management Research Laboratory, U.S. Environmental Protection Agency, 109 T.W. Alexander Drive, Research Triangle Park, NC 27711, USA. dean.timothy@epa.gov
Abstract:
Because of the accumulating evidence that suggests that numerous unhealthy conditions in the indoor environment are the result of abnormal growth of the filamentous fungi (mold) in and on building surfaces, it is necessary to accurately reflect the organisms responsible for these maladies and to identify them in precise and timely manner. To this end, we have developed a method that is cost effective, easy to perform, and accurate. We performed a simple polymerase chain reaction/restriction fragment length polymorphism (PCR/RFLP) analysis on multiple members of species known to negatively influence the indoor environment. The genera analyzed were Stachybotrys, Penicillium, Aspergillus, and Cladosporium. Each organism underwent PCR with universal primers that amplified ribosomal sequences generating products from 550 to 600 bp followed by enzymatic digestion with EcoRI, HaeIII, MspI, and HinfI. Our results show that using this combination of restriction enzymes enables the identification of these fungal organisms at the species level.
Insights
Accurate identification of indoor mold species is crucial for health. A cost-effective polymerase chain reaction/restriction fragment length polymorphism (PCR/RFLP) method reliably identifies common indoor fungi like Aspergillus and Penicillium at the species level.
Area of Science:
- Environmental Science
- Mycology
- Molecular Biology
Background:
- Indoor environmental quality is linked to health issues caused by airborne fungi.
- Accurate identification of filamentous fungi (mold) is essential for addressing indoor health concerns.
Purpose of the Study:
- To develop a cost-effective, accurate, and rapid method for identifying indoor mold species.
- To enable precise identification of fungi commonly found in indoor environments.
Main Methods:
- Utilized polymerase chain reaction (PCR) with universal primers to amplify ribosomal DNA sequences (550-600 bp).
- Performed restriction fragment length polymorphism (RFLP) analysis using restriction enzymes EcoRI, HaeIII, MspI, and HinfI.
- Applied the PCR/RFLP method to identify species within the genera Stachybotrys, Penicillium, Aspergillus, and Cladosporium.
Main Results:
- The PCR/RFLP technique successfully amplified target ribosomal DNA sequences from the analyzed fungal genera.
- Enzymatic digestion patterns generated by the combination of EcoRI, HaeIII, MspI, and HinfI were unique for each species.
- This method demonstrated the capability to differentiate and identify fungal organisms at the species level.
Conclusions:
- The developed PCR/RFLP method provides an accurate and efficient means for identifying common indoor mold species.
- This technique can aid in diagnosing and mitigating indoor environmental health problems linked to fungal contamination.
- The study establishes a valuable tool for researchers and professionals concerned with indoor air quality and fungal identification.
