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A simple, sensitive and safe method to determine the human α/β-tryptase genotype
Quang Trong Le1, Sahar Lotfi-Emran1, Hae-Ki Min1
1Department of Internal Medicine, Virginia Commonwealth University, Richmond, Virginia, United States of America.
Plos One
|December 30, 2014
Summary
Researchers developed a sensitive method to determine alpha/beta-tryptase gene ratios. This accurate technique aids in understanding severe atopy and related genetic variations.
Area of Science:
- Genetics
- Molecular Biology
- Immunology
Background:
- The human tryptase gene locus on chromosome 16 influences severe atopy.
- Variations in alpha-tryptase (α) and beta-tryptase (β) gene ratios (0:4, 1:3, 2:2) have potential clinical relevance.
Purpose of the Study:
- To develop and validate a sensitive, accurate method for determining α/β-tryptase gene ratios.
- To enable high-throughput screening for genotype-phenotype correlations.
Main Methods:
- Utilized PCR products spanning intron 1 to exon 5, leveraging an EcoRV restriction site present in α-tryptase but not β-tryptase.
- Compared non-radioactive labeling methods: ethidium bromide, digoxigenin-primer, and DY682-primer for final PCR cycle products.
- Assessed sensitivity and accuracy in quantifying α/β-tryptase gene ratios.
Main Results:
- Final PCR cycle labeling (digoxigenin or DY682) increased sensitivity approximately 60-fold compared to ethidium bromide.
- Ethidium bromide underestimated α-tryptase due to resistant heteroduplexes.
- DY682-primer labeling was most efficient, allowing direct analysis of PCR/EcoRV products in gels.
Conclusions:
- A sensitive, accurate, simple, and safe method for determining α/β-tryptase genotype has been established.
- This technique facilitates high-throughput screening for genotype-phenotype relationships in α/β-tryptases and related alleles.
