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Otto JJ, Correll VL, Engstroem HA, Hitefield NL, Main BP, Albracht B, Johnson-Pais T, Yang LF, Liss M, Boutros PC, Kislinger T, Leach RJ, Semmes OJ, Nyalwidhe JO. Targeted Mass Spectrometry of a Clinically Relevant PSA Variant from Post-DRE Urines for Quantitation and Genotype Determination. Proteomics Clin Appl 2020; 14:e2000012. [PMID: 32614141 PMCID: PMC7674190 DOI: 10.1002/prca.202000012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 06/08/2020] [Indexed: 01/03/2023]
Abstract
Purpose The rs17632542 single nucleotide polymorphism (SNP) results in lower serum prostate specific antigen (PSA) levels which may further mitigate against its clinical utility as a prostate cancer biomarker. Post‐digital rectal exam (post‐DRE) urine is a minimally invasive fluid that is currently utilized in prostate cancer diagnosis. To detect and quantitate the variant protein in urine. Experimental design Fifty‐three post‐DRE urines from rs17632542 genotyped individuals processed and analyzed by liquid chromatography/mass spectrometry (LC‐MS) in a double‐blinded randomized study. The ability to distinguish between homozygous wild‐type, heterozygous, or homozygous variant is examined before unblinding. Results Stable‐isotope labeled peptides are used in the detection and quantitation of three peptides of interest in each sample using parallel reaction monitoring (PRM). Using these data, groupings are predicted using hierarchical clustering in R. Accuracy of the predictions show 100% concordance across the 53 samples, including individuals homozygous and heterozygous for the SNP. Conclusions and clinical relevance The study demonstrates that MS based peptide variant quantitation in urine could be useful in determining patient genotype expression. This assay provides a tool to evaluate the utility of PSA variant (rs17632542) in parallel with current and forthcoming urine biomarker panels.
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Affiliation(s)
- Joseph J Otto
- Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA, 23507, USA
| | - Vanessa L Correll
- Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA, 23507, USA
| | - Hampus A Engstroem
- Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA, 23507, USA
| | - Naomi L Hitefield
- Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA, 23507, USA.,Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, VA, 23507, USA
| | - Brian P Main
- Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA, 23507, USA
| | - Brenna Albracht
- Department of Urology, The University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Teresa Johnson-Pais
- Department of Urology, The University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Li Fang Yang
- Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA, 23507, USA.,Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, VA, 23507, USA
| | - Michael Liss
- Department of Urology, The University of Texas Health San Antonio, San Antonio, TX, 78229, USA.,Mays Cancer Center at UT Health San Antonio/MD Anderson, San Antonio, TX, 78229, USA
| | - Paul C Boutros
- Departments of Human Genetics and Urology, Jonsson Comprehensive Cancer Center, Institute for Precision Health University of California Los Angeles, Los Angeles, CA, 90095, USA.,University of Toronto, Department of Medical Biophysics, Toronto, ON M5G 1L7, Canada
| | - Thomas Kislinger
- University of Toronto, Department of Medical Biophysics, Toronto, ON M5G 1L7, Canada
| | - Robin J Leach
- Department of Urology, The University of Texas Health San Antonio, San Antonio, TX, 78229, USA.,Department of Cell Systems and Anatomy, The University of Texas Health San Antonio, San Antonio, TX, 78229, USA
| | - Oliver J Semmes
- Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA, 23507, USA.,Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, VA, 23507, USA
| | - Julius O Nyalwidhe
- Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA, 23507, USA.,Department of Microbiology and Molecular Cell Biology, Eastern Virginia Medical School, Norfolk, VA, 23507, USA
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