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Rapid p53 sequence analysis in primary lung cancer using an oligonucleotide probe array.

S A Ahrendt¹, S Halachmi, J T Chow

¹Department of Surgery, Medical College of Wisconsin, 9200 West Wisconsin Avenue, Milwaukee, WI 53226, USA.

Proceedings of the National Academy of Sciences of the United States of America

|June 23, 1999

Summary

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Comparing two methods for p53 gene mutation detection in lung cancer, the p53 GeneChip assay showed higher mutation detection rates than direct sequencing. Both methods have limitations in identifying all p53 mutations.

Area of Science:

Molecular Biology
Oncology
Genetics

Background:

The p53 tumor suppressor gene is frequently mutated in human cancers, including lung cancer.
Accurate detection of p53 mutations is crucial for understanding cancer development and guiding treatment.

Purpose of the Study:

To compare the accuracy and limitations of direct dideoxynucleotide sequencing and the p53 GeneChip assay for detecting p53 gene mutations in primary human lung cancers.

Main Methods:

Direct dideoxynucleotide cycle sequencing and p53 GeneChip assay were used to analyze the p53 gene in 100 primary human lung cancers.
Detected mutations were confirmed using mutation-specific oligonucleotide hybridization.

Main Results:

Direct sequencing of conserved regions (exons 5-9) detected 76% of mutations.

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The p53 GeneChip assay detected 81% of all p53 mutations (exons 2-11), including 80% in conserved regions.

The GeneChip assay showed 98% specificity, while direct sequencing had 100% specificity.

Conclusions:

The p53 GeneChip assay is a rapid and reasonably accurate method for p53 mutation detection in lung cancer.
Neither direct sequencing nor the GeneChip assay are infallible for comprehensive p53 mutation identification.