Biodosimetry on small blood volume using gene expression assay

Area of Science:

• Biotechnology
• Molecular Biology
• Radiation Biology

Background:

• Accurate biodosimetry is crucial for managing radiation exposure during public health emergencies.
• Existing methods for assessing radiation dose can be time-consuming or require large sample volumes.
• There is a need for rapid, sensitive, and scalable biodosimetry tools.

Purpose of the Study:

• To develop and validate a novel biodosimetry device for rapid measurement of radiation exposure.
• To establish a gene expression signature for quantifying radiation dose and injury.
• To create a platform adaptable for both high-throughput screening and point-of-care applications.

Main Methods:

• Selection of a 14-gene low-density gene set based on radiation-induced differential expression from a 41,000-transcript profiling.
• Development of a quantitative Nuclease Protection Assay (qNPA) for direct gene expression analysis.
• Validation of the qNPA platform using small volumes (30 microL) of human whole blood, including fingerstick samples.
• Analysis of in vitro irradiated blood samples to assess assay performance.

Main Results:

• The qNPA platform successfully measured gene expression levels in human whole blood.
• Statistically significant discrimination was achieved between irradiated and non-irradiated blood samples.
• The assay demonstrated compatibility with small blood volumes, suitable for fingerstick collection.
• The selected 14-gene profile effectively indicated biological radiation exposure.

Conclusions:

• The developed qNPA biodosimetry platform is a valid and rapid method for assessing biological radiation exposure.
• Its scalability makes it suitable for population triage in emergency situations.
• The platform holds potential for personalized monitoring of radiotherapy patients.
• This technology offers a promising approach for radiation biodosimetry in diverse clinical and emergency settings.