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Related Concept Videos

Fixation and Sectioning01:03

Fixation and Sectioning

Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...

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Hybrid-Cut: An Improved Sectioning Method for Recalcitrant Plant Tissue Samples
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Critical steps in tissue processing in histopathology.

Maria Comanescu1, Laura Annaratone, Giuseppe D'Armento

  • 1Victor Babes Institute, Bucharest, Romania, Spl. Independentei 99-101, 050096 Bucharest - Romania.

Recent Patents on DNA & Gene Sequences
|January 3, 2012
PubMed
Summary
This summary is machine-generated.

Preserving RNA in Formalin-Fixed Paraffin Embedded (FFPE) tissues is crucial for cancer diagnostics. Cold fixation significantly improves nucleic acid preservation, enabling advanced molecular analysis for personalized medicine.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Pathology

Background:

  • Histopathological diagnosis of Formalin-Fixed Paraffin Embedded (FFPE) tissues is vital for cancer patient management.
  • Increasing demand for immunophenotypic and gene expression data from FFPE tissues for personalized therapy.
  • Current FFPE processing methods face challenges in preserving nucleic acid integrity, particularly RNA.

Purpose of the Study:

  • To present novel molecular approaches for analyzing FFPE tissues.
  • To report an advancement in tissue fixation for improved nucleic acid preservation.
  • To evaluate cold fixation as a method for enhancing RNA stability in FFPE samples.

Main Methods:

  • Development of novel molecular approaches for RT-qPCR and gene array analysis on FFPE tissues.
  • Investigation of tissue fixation protocols, including a comparison between formalin immersion and vacuum sealing with cooling.
  • Assessment of nucleic acid sequence preservation under different fixation conditions, with a focus on cold fixation.

Main Results:

  • Novel molecular methods for RT-qPCR and gene array analysis on FFPE tissues were successfully developed.
  • Cold fixation of tissue specimens was observed to significantly enhance the preservation of nucleic acid sequences.
  • The alternative method of vacuum sealing and cooling specimens is presented as an environmentally safe procedure overcoming formalin drawbacks.

Conclusions:

  • Cold fixation represents a major advance in preserving nucleic acid integrity in FFPE tissues.
  • Improved RNA preservation in FFPE tissues facilitates advanced molecular diagnostics and personalized cancer therapy.
  • Novel molecular techniques coupled with optimized fixation protocols can enhance the utility of archival FFPE samples.