Ultrastructural analysis of nuclear bodies using electron microscopy.

Area of Science:

• Cell Biology
• Molecular Biology
• Microscopy Techniques

Background:

• Recent immunofluorescence studies identified novel nuclear foci lacking clear ultrastructural definition.
• Noncoding RNAs (ncRNAs) are recognized as key components of many nuclear bodies.

Purpose of the Study:

• To establish high-resolution methods for characterizing newly discovered nuclear compartments.
• To combine ultrastructural and molecular information for emerging nuclear bodies.

Main Methods:

• Utilized immuno-electron microscopy (I-EM) with antibodies as ligands for high-resolution recognition.
• Employed electron microscopic in situ hybridization (EM-ISH) to detect noncoding RNAs within nuclear foci.
• Implemented Lowicryl embedding of chemically fixed cells for optimal structure and antigen preservation.
• Developed rapid post-embedding protocols for both I-EM and EM-ISH, enabling combined analysis on the same sections.

Main Results:

• Demonstrated the feasibility of combining I-EM and EM-ISH on the same cell sections.
• Achieved high preservation of nuclear structures and antigenicity using Lowicryl embedding.
• Provided a dual approach for ultrastructural and molecular characterization of nuclear bodies.

Conclusions:

• I-EM and EM-ISH are powerful complementary techniques for studying novel nuclear bodies.
• Lowicryl embedding facilitates robust and repeatable analysis of nuclear compartments.
• This combined methodology offers significant insights into the composition and structure of emerging nuclear bodies.