In utero time-course assessment of mouse embryo development using high resolution magnetic resonance imaging

Area of Science:

• Biomedical Imaging
• Developmental Biology
• Genomics

Background:

• Accurate phenotyping of mouse embryos is crucial for understanding developmental biology and post-genomic applications.
• Non-invasive imaging techniques are needed for longitudinal studies of embryonic development in utero.
• Assessing embryonic kidney function requires high-resolution imaging methods.

Purpose of the Study:

• To evaluate magnetic resonance microscopy (MRM) for in utero phenotyping of mouse embryos.
• To assess the capability of MRM in visualizing embryonic sub-structures and kidney function.
• To determine the earliest developmental stages at which specific embryonic organs are identifiable using MRM.

Main Methods:

• Magnetic resonance microscopy was employed for longitudinal follow-up of mouse embryonic development.
• 50 nm magnetite dextran particles were used to assess embryonic kidney function.
• Morphologic proton images were acquired with an in-plane resolution of 195 micrometers and slice thickness of 800 micrometers.

Main Results:

• MRM visualized key embryonic sub-structures from E11/12, including the fourth ventricle, mesencephalic vesicle, aorta, and liver.
• Heart, diaphragm, spinal cord, and ventricles were clearly identified at E13/14.
• Skeleton, tail, kidney, and digits became visible from E15/16, with kidney and bladder definitively identified from E16 onwards.

Conclusions:

• MR microscopy is a powerful non-invasive tool for in utero phenotyping of mouse embryos.
• This technique allows for longitudinal assessment of embryonic development and organogenesis.
• MRM holds significant potential for post-genomic applications requiring detailed embryonic analysis.