Improved fluorescence method for identifying sex chromatin in formalin-fixed tissue

Area of Science:

• Histology
• Cytogenetics
• Biochemical Staining Techniques

Background:

• Accurate sex chromatin identification is crucial in various biological and medical fields.
• Existing fluorescence methods for sex chromatin detection may have limitations in formalin-fixed tissues.
• A need exists for reliable and optimized fluorescence techniques for cytogenetic analysis.

Purpose of the Study:

• To describe an improved fluorescence method for demonstrating sex chromatin in formalin-fixed tissue sections.
• To optimize staining and mounting procedures for enhanced nuclear fluorescence.
• To validate the method for identifying Y chromatin and Barr bodies in interphase nuclei.

Main Methods:

• Deparaffinization of formalin-fixed tissue sections.
• Pretreatment with pronase enzyme followed by acid hydrolysis.
• Staining with quinacrine dihydrochloride.
• Mounting in buffered Gelvatol for optimized fluorescence.

Main Results:

• Achieved optimized fluorescence of nuclei for clear visualization.
• Successfully demonstrated the recognition of Y chromatin (Y-chromatin) and Barr bodies (sex chromatin) in interphase nuclei.
• The method proved effective for sexing early conceptuses and teratomata.

Conclusions:

• The described fluorescence method offers an improved and reliable approach for sex chromatin demonstration.
• This technique is valuable for retrospective studies using archived paraffin-embedded tissues.
• It serves as a useful tool in reproductive biology and pathology for sex determination.