Quantitative DNA Analyses for Airborne Birch Pollen.

Area of Science:

• Environmental Science
• Molecular Biology
• Allergology

Background:

• Birch pollen is a major allergen causing respiratory issues like hay fever and asthma.
• Traditional pollen counting is time-consuming and lacks species-specific identification.
• Molecular methods, like qPCR, offer faster, more accurate species identification and quantification.

Purpose of the Study:

• To evaluate quantitative Real-Time polymerase chain reaction (qPCR) for quantifying airborne birch pollen.
• To compare qPCR performance using single-copy (BP8) and multi-copy (ITS) genes.
• To assess the distribution of birch pollen DNA in fine and coarse particulate matter.

Main Methods:

• Air filter samples collected during the 2010 birch pollination season in Mainz, Germany.
• Analysis using qPCR with two primer pairs: BP8 (single-copy gene) and ITS (multi-copy gene).
• Comparison of qPCR results with the COSMO-ART air quality model and analysis of DNA in fine (<3 μm) and coarse particulate matter.

Main Results:

• The BP8 gene provided more reliable qPCR results for birch pollen quantification.
• qPCR results for coarse particulate matter correlated well with the COSMO-ART model's birch pollen forecasts.
• Higher concentrations of birch pollen DNA were found in coarse particles compared to fine particles, with a factor of 51 for BP8 and 64 for ITS.

Conclusions:

• qPCR is a promising method for precise quantification of atmospheric birch pollen.
• The study highlights the potential of molecular methods for improved allergy forecasting.
• Further investigation into sub-pollen particles in fine particulate matter is warranted due to their high allergenicity.