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Genome-wide association study in esophageal cancer using GeneChip mapping 10K array
1Cancer Prevention Studies Branch, Laboratory of Population Genetics, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA.
Cancer Research
|April 5, 2005
Summary
This pilot study demonstrates the feasibility of using high-density SNP arrays for genome-wide association studies in esophageal squamous cell carcinoma (ESCC). Researchers identified potential genetic markers for ESCC risk and progression.
Area of Science:
- Genetics
- Oncology
- Genomics
Background:
- Whole genome association studies (WGS) are crucial for understanding complex human diseases.
- Esophageal squamous cell carcinoma (ESCC) is a complex cancer requiring genetic investigation.
Purpose of the Study:
- To assess the utility of the Affymetrix 10K SNP array for genome-wide association studies (GWAS) in ESCC.
- To identify novel genetic loci associated with ESCC risk.
Main Methods:
- A pilot case-control study involving 50 ESCC patients and 50 matched controls.
- Genotyping was performed using an Affymetrix high-density SNP array (11,555 SNPs).
- Statistical analysis included generalized linear models (GLM) and principal component analysis (PCA).
Main Results:
- A high average genotyping call rate of 96% was achieved.
- GLM identified 37, 48, and 53 SNPs associated with ESCC under recessive, dominant, and continuous modes, respectively.
- Principal component analysis using recessive mode SNPs predicted cases and controls with high accuracy (46/50 and 47/50).
- 39 identified SNPs mapped to 33 genes, including known cancer-related genes like GASC1, EPHB1, and PIK3C3.
Conclusions:
- The Affymetrix 10K SNP array is a feasible tool for GWAS in common cancers like ESCC.
- New candidate genes and loci for ESCC warrant further investigation.