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Updated: Aug 8, 2026
Visualizing Genetic Variants, Short Targets, and Point Mutations in the Morphological Tissue Context with an RNA In Situ Hybridization Assay
Published on: August 14, 2018
A useful protocol for analyses of mutations of the epidermal growth factor receptor gene
Dage Liu1, Jun Nakano, Masaki Ueno
1Second Department of Surgery, Kagawa University, Kita-gun, Kagawa 761-0793, Japan.
Abstract:
Recent studies have reported that mutations of the epidermal growth factor receptor (EGFR) gene are associated with the responsiveness of tyrosine kinase inhibitors (TKIs), which are molecular targets for non-small cell lung cancer (NSCLC). To provide genetic analyses for NSCLC patients, a simple and reliable method using paraffin-embedded materials is needed. The DEXPAT DNA extraction kit was used for DNA extraction from paraffin-embedded materials. DNA was amplified using the nested PCR technique, then analyzed by direct sequencing for EGFR mutations (exons 18 to 21). The phenol/chloroform extraction for DNA was also performed for comparison. When the DEXPAT kit was used, distinct bands were observed in all products after nested PCR assays of paraffin-embedded materials. Distinct sequencing signals were obtained. Results from the sequencing analysis of paraffin-embedded materials and frozen materials were completely concordant. The current study suggests that DNA extraction with the DEXPAT kit followed by nested PCR is a simple and reliable technique for analyzing the EGFR gene status with paraffin-embedded samples.
Insights
A new DNA extraction method using the DEXPAT kit enables reliable EGFR mutation analysis in non-small cell lung cancer (NSCLC) patients from paraffin-embedded tissues. This technique offers a simple and effective approach for genetic testing in NSCLC.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- Epidermal growth factor receptor (EGFR) gene mutations are key biomarkers for non-small cell lung cancer (NSCLC) treatment response to tyrosine kinase inhibitors (TKIs).
- Accurate genetic analysis of EGFR mutations is crucial for personalized NSCLC therapy.
- A reliable method for DNA extraction from paraffin-embedded tissues is needed for routine clinical genetic testing.
Purpose of the Study:
- To evaluate the efficacy of the DEXPAT DNA extraction kit for analyzing EGFR mutations in paraffin-embedded NSCLC samples.
- To establish a simple and reliable method for genetic analysis of EGFR in NSCLC patients using archival tissue.
Main Methods:
- DNA was extracted from paraffin-embedded NSCLC tissues using the DEXPAT kit and compared with phenol/chloroform extraction.
- EGFR mutations in exons 18-21 were analyzed using nested PCR amplification followed by direct sequencing.
- DNA quality and sequencing results from paraffin-embedded samples were compared with those from frozen tissues.
Main Results:
- The DEXPAT kit consistently yielded amplifiable DNA from paraffin-embedded materials, showing distinct bands after nested PCR.
- High-quality sequencing signals were obtained from DNA extracted using the DEXPAT kit.
- EGFR mutation analysis results from paraffin-embedded tissues were fully concordant with those from frozen tissues.
Conclusions:
- DNA extraction with the DEXPAT kit followed by nested PCR is a simple, reliable, and effective method for EGFR mutation analysis in paraffin-embedded NSCLC samples.
- This technique facilitates genetic profiling of NSCLC patients using readily available archival tissues.
- The findings support the clinical utility of the DEXPAT kit for routine EGFR genotyping in non-small cell lung cancer.
