Z Probe, An Efficient Tool for Characterizing Long Non-Coding RNA in FFPE Tissues.

Area of Science:

• Molecular Biology
• Cancer Research
• Biomarker Discovery

Background:

• Formalin-fixed paraffin embedded (FFPE) tissues are crucial for disease etiology research, but RNA degradation poses challenges for studying RNA biomarkers.
• Long non-coding RNAs (lncRNAs) are increasingly recognized for their biological roles and involvement in cancer.
• Current methods like RNA sequencing and qRT-PCR lack visual representation for lncRNA expression in tissues.

Purpose of the Study:

• To standardize and report a sensitive Z probe-based in situ hybridization method for visualizing and quantifying lncRNAs in FFPE tissues.
• To demonstrate the assay's ability to detect various lncRNAs, including NRON, UCA1, and MALAT1, in different cancer types.

Main Methods:

• Development and standardization of a Z probe-based in situ hybridization assay.
• Application of the assay to FFPE tissue samples from various cancers.
• Visual identification and quantification of specific lncRNAs (NRON, UCA1, MALAT1).

Main Results:

• The Z probe-based in situ hybridization method is highly sensitive for detecting lncRNAs in FFPE tissues.
• NRON, UCA1, and MALAT1 lncRNAs were successfully detected in different cell types and tumors.
• High MALAT1 expression was observed in colorectal, breast, and pancreatic cancers, with increased expression correlating with colorectal cancer stages.

Conclusions:

• The developed in situ hybridization assay provides a sensitive and visual method for lncRNA detection in FFPE tissues.
• This technique facilitates lncRNA biomarker discovery and understanding their role in cancer progression.
• MALAT1 expression patterns in specific cancers suggest its potential as a prognostic or diagnostic biomarker.