Tissue Microarray Technology for Molecular Applications: Investigation of Cross-Contamination between Tissue Samples...

Area of Science:

• Biotechnology
• Molecular Biology
• Pathology

Background:

• Tissue microarray (TMA) enables rapid molecular marker visualization.
• TMA instrumentation can be adapted for nucleic acid analysis via PCR.
• Potential cross-contamination during sample punching has been a concern.

Purpose of the Study:

• To investigate cross-contamination in TMA sample punching.
• To assess the necessity of cleaning the TMA puncher between samples.
• To evaluate TMA's utility in nucleic acid analysis.

Main Methods:

• Two experiments were conducted using an automated TMA instrument.
• Mycobacterium tuberculosis (TB) positive and negative tissues were analyzed for cross-contamination.
• KRAS mutated and wild-type colorectal cancer tissues were analyzed with and without cleaning steps.

Main Results:

• All alternating samples yielded expected results, indicating no cross-contamination.
• Similar results were observed even when the puncher was not cleaned between samples.
• PCR and pyrosequencing confirmed the absence of cross-contamination.

Conclusions:

• TMA technology can be reliably used for nucleic acid analysis without cross-contamination.
• A cleaning step for the TMA puncher is recommended but not essential to prevent cross-contamination.
• TMA is a valuable tool for molecular analyses beyond its traditional applications.