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Related Concept Videos

Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...

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An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Response to the Comments on "Determining Allele-Specific Protein Expression (ASPE) Using a Novel Quantitative

Jian Shi1, Xinwen Wang1, Huaijun Zhu1,2

  • 1Department of Clinical Pharmacy , University of Michigan , Ann Arbor , Michigan 48109 , United States.

Journal of Proteome Research
|January 9, 2019
PubMed
Summary

This study introduces a novel QconCAT standard for precise allele-specific protein expression (ASPE) measurement. The enhanced standard improves accuracy in identifying genetic variants by accounting for protein digestion efficiency.

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Area of Science:

  • Proteomics
  • Genetics
  • Biochemistry

Background:

  • Quantitative proteomics enables simultaneous measurement of wild-type and mutant peptides.
  • Previous QconCAT standards have limitations in accurately quantifying allele-specific protein expression (ASPE).
  • Trypsin digestion efficiency is influenced by flanking amino acid residues, impacting quantification accuracy.

Purpose of the Study:

  • To develop a targeted proteomics method for determining allele-specific protein expression (ASPE).
  • To establish the utility of ASPE imbalance as a phenotype for identifying cis-regulatory genetic variants.
  • To create an improved QconCAT standard that enhances the accuracy of ASPE ratio measurements.

Main Methods:

  • Development of a novel QconCAT standard incorporating at least 15 native flanking amino acids.
  • Utilizing the QconCAT standard for simultaneous quantification of wild-type and mutant peptides.
  • Application of targeted proteomics to measure ASPE and identify genetic variants.

Main Results:

  • The novel QconCAT standard ensures accurate measurement of ASPE ratios by mitigating trypsin digestion variability.
  • The study demonstrates the effectiveness of ASPE imbalance as a phenotype for genetic variant identification.
  • This method provides a more robust approach to quantifying protein expression differences at the allelic level.

Conclusions:

  • The developed QconCAT standard significantly improves the accuracy of allele-specific protein expression quantification.
  • This methodology offers a powerful tool for discovering cis-regulatory genetic variants.
  • The findings advance the field of quantitative proteomics and genetic variant analysis.