A versatile genetic-encoded reporter for magnetic resonance imaging

Area of Science:

• Biomedical Imaging
• Molecular Biology
• Genetic Engineering

Background:

• Noninvasive, longitudinal imaging of gene expression with high spatiotemporal resolution is a significant challenge in biomedical research.
• Current methods often require invasive procedures or lack the necessary resolution for detailed analysis.
• The need for a versatile reporter system for in vivo gene expression studies is critical.

Purpose of the Study:

• To develop a novel genetic encoded magnetic resonance imaging (GEM) reporter for noninvasive visualization of cell-specific gene expression.
• To enable longitudinal tracking of gene expression in living subjects, including rodents and primates.
• To provide a substrate-independent imaging tool for enhanced biomedical research.

Main Methods:

• Engineered a novel GEM reporter through codon modification of a bacteria-originated manganese (Mn) binding protein.
• Demonstrated the ability of the GEM reporter to sequester endogenous Mn in local tissues.
• Validated the reporter's function in bacteria, plants, and animals for MRI visualization.

Main Results:

• The GEM reporter robustly produces high image contrast in T1-weighted MRI without exogenous contrast agents or substrates.
• The reporter allows for inherent MRI tracking of specific cells and tissues.
• Successful visualization of gene expression was achieved in various biological systems.

Conclusions:

• The developed GEM reporter is a versatile tool for spatiotemporal deciphering of gene expression in living subjects.
• This technology offers a noninvasive and longitudinal approach to monitor gene activity.
• GEM reporters represent a significant advancement in in vivo molecular imaging for biomedical research.