Related Experiment Videos
Interethnic difference in the allelic distribution of human epidermal growth factor receptor intron 1 polymorphism
Wanqing Liu1, Federico Innocenti, Peixian Chen
1Department of Medicine, The University of Chicago, 5841 South Maryland Avenue, Chicago, IL 60637, USA.
Purpose:
Epidermal growth factor receptor (EGFR) plays a critical role in signal transduction and is a target for a novel class of anticancer agents that aim to inhibit EGFR-mediated cancer cell growth. Previous studies have demonstrated a dinucleotide (CA)(n) repeat polymorphism in intron 1 of EGFR, ranging from 14 to 21 repeats, that has been suggested to regulate EGFR expression. The longer allele with 21 repeats showed an 80% reduction of gene expression compared with the shorter allele with 16 repeats. Therefore, the evaluation of the allelic distribution of this polymorphism in populations of various ethnic origins will be crucial to understand the interindividual variability in EGFR expression.
Experimental Design:
We evaluated the influence of ethnicity on this polymorphism by genotyping individuals of Caucasian (n = 183), African-American (n = 84), and Asian (n = 66) background.
Results:
The frequency of one of the longer alleles, allele 20 is significantly higher in Asian individuals (63% compared with 21% in Caucasians, P = 2 x 10(-18)). In confirmation of prior studies, the shorter allele 16 was the most common allele in Caucasians (43%) and African-Americans (42%), but its frequency was significantly lower in Asians (average 17%, P = 10(-7) compared with Caucasians).
Conclusion:
Major interethnic differences in the allelic frequencies of the EGFR intron 1 polymorphism exist. Our results may contribute to a better understanding of the molecular basis underlying ethnic differences in drug response and may be helpful for future strategies of individualized therapy with EGFR inhibitors.
Insights
Ethnic differences in the epidermal growth factor receptor (EGFR) intron 1 polymorphism are significant. Allele frequencies vary, impacting EGFR expression and potentially drug response in diverse populations.
Area of Science:
- Genetics
- Pharmacogenomics
- Oncology
Background:
- Epidermal growth factor receptor (EGFR) is crucial for cancer cell growth and a target for anticancer drugs.
- A (CA)(n) repeat polymorphism in EGFR intron 1 may regulate gene expression.
- Longer alleles with more repeats are associated with reduced EGFR expression.
Purpose of the Study:
- To investigate the influence of ethnicity on the allelic distribution of the EGFR intron 1 polymorphism.
- To understand interindividual variability in EGFR expression across different ethnic groups.
- To explore the implications for individualized cancer therapy.
Main Methods:
- Genotyping of individuals from Caucasian, African-American, and Asian backgrounds.
- Analysis of allelic frequencies of the EGFR intron 1 polymorphism.
- Statistical comparison of allele distributions across ethnic groups.
Main Results:
- Significant interethnic differences in EGFR intron 1 polymorphism allelic frequencies were observed.
- Allele 20 was significantly more frequent in Asians compared to Caucasians.
- Allele 16 was most common in Caucasians and African-Americans but less frequent in Asians.
Conclusions:
- Substantial ethnic variations exist in the EGFR intron 1 polymorphism.
- These findings contribute to understanding ethnic differences in drug response.
- Results may inform future personalized therapy strategies using EGFR inhibitors.