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Identification of target genes in laryngeal squamous cell carcinoma by high-resolution copy number and gene
A-K Järvinen1, R Autio, S Haapa-Paananen
1Biomedicum Biochip Center and Institute of Biomedicine, University of Helsinki, Helsinki, Finland.
Abstract:
Molecular mechanisms contributing to initiation and progression of head and neck squamous cell carcinoma are still poorly known. Numerous genetic alterations have been described, but molecular consequences of such alterations in most cases remain unclear. Here, we performed an integrated high-resolution microarray analysis of gene copy number and expression in 20 laryngeal cancer cell lines and primary tumors. Our aim was to identify genetic alterations that play a key role in disease pathogenesis and pinpoint genes whose expression is directly impacted by these events. Integration of DNA level data from array-based comparative genomic hybridization with RNA level information from oligonucleotide microarrays was achieved with custom-developed bioinformatic methods. High-level amplifications had a clear impact on gene expression. Across the genome, overexpression of 739 genes could be attributed to gene amplification events in cell lines, with 325 genes showing the same phenomenon in primary tumors including FADD and PPFIA1 at 11q13. The analysis of gene ontology and pathway distributions further pinpointed genes that may identify potential targets of therapeutic intervention. Our data highlight genes that may be critically important to laryngeal cancer progression and offer potential therapeutic targets.
Insights
This study investigated genetic alterations in laryngeal cancer. Researchers identified key gene amplifications impacting gene expression, revealing potential therapeutic targets for head and neck squamous cell carcinoma.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- The molecular mechanisms driving head and neck squamous cell carcinoma (HNSCC) initiation and progression are not fully understood.
- While numerous genetic alterations are known in HNSCC, their functional consequences often remain unclear.
- Laryngeal cancer, a subset of HNSCC, requires further investigation into its underlying molecular pathology.
Purpose of the Study:
- To identify critical genetic alterations in laryngeal cancer pathogenesis.
- To pinpoint genes whose expression is directly influenced by these genetic events.
- To discover potential therapeutic targets for laryngeal cancer.
Main Methods:
- Integrated high-resolution microarray analysis of gene copy number and gene expression.
- Utilized array-based comparative genomic hybridization (aCGH) for DNA-level analysis.
- Employed oligonucleotide microarrays for RNA-level analysis, integrated using custom bioinformatic methods.
- Analyzed gene ontology and pathway distributions.
Main Results:
- High-level gene amplifications were found to significantly impact gene expression.
- Overexpression of 739 genes was linked to gene amplification events in cell lines.
- In primary tumors, 325 genes showed similar amplification-driven overexpression, including FADD and PPFIA1 at chromosome 11q13.
- Pathway analysis identified genes with potential as therapeutic targets.
Conclusions:
- Genetic amplifications play a significant role in laryngeal cancer progression by altering gene expression.
- The study identified specific genes, such as FADD and PPFIA1, affected by amplification in laryngeal tumors.
- These findings highlight critical genes and potential therapeutic targets for laryngeal cancer intervention.