CKD Diagnosis via Plasma Protein Post-Translational Modification Analysis
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Solution Overview
Problem
Current methods for diagnosing chronic kidney disease (CKD) are limited in detecting early stages and rely on physiological parameters that only indicate renal failure after it has occurred, failing to provide accurate early detection or monitoring of renal impairment before significant kidney damage.
Innovation Solution
The method involves analyzing and quantifying post-translational modifications of plasma proteins, specifically comparing patterns in patient samples to those of healthy individuals to detect specific modifications that indicate early stages of CKD, using techniques like MALDI-TOF-TOF MS/MS and immunological methods for accurate diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current diagnostic methods (creatinine measurement, GFR calculation) are used, then renal failure can be detected, but only after significant kidney damage has already occurred
Solution Approach 1:
Instead of measuring physiological parameters that indicate kidney failure after it occurs (creatinine, GFR), the invention inverts the approach by measuring post-translational modifications of plasma proteins that occur before kidney damage. This reverse approach enables detection of early-stage CKD by looking for molecular changes (oxidation, carbamylation, glycosylation) that precede functional impairment, thereby resolving the contradiction between reliable diagnosis and early detection timing
2Measurement precision
If physiological parameters (creatinine, GFR) are measured, then renal function can be assessed, but the methods are limited to detecting renal failure that has already occurred
Solution Approach 1:
The invention makes the diagnostic approach universally applicable across all CKD stages by using post-translational modification markers that are present from early stages through end-stage renal disease. Unlike creatinine-based methods that only work after damage occurs, the PTM markers (oxidized proteins, carbamylated proteins, glycated proteins) provide a universal diagnostic tool that adapts to detect kidney impairment at any stage, resolving the contradiction between measurement precision for early detection and versatility across disease stages
3Reliability
If multiple diagnostic methods (MDRD formula, Cockroft-Gault formula, cystatin C) are used, then GFR can be calculated, but the methods yield different results and cannot accurately attribute CKD stages
Solution Approach 1:
The invention extracts the essential diagnostic information by focusing on specific post-translational modification markers (oxidation, carbamylation, glycosylation) of plasma proteins. Instead of using multiple complex formulas (MDRD, Cockroft-Gault, cystatin C) that yield conflicting results, the method extracts a simplified yet highly accurate diagnostic signal from protein modifications. This extraction approach resolves the contradiction by providing reliable CKD stage attribution through a single, unified method rather than multiple conflicting methods
4Loss of time
If post-translational modifications of plasma proteins are analyzed, then early stage CKD can be detected, but the analysis method is more complex than standard creatinine measurement
Solution Approach 1:
The invention replaces the simple mechanical/chemical measurement of creatinine concentration with a more sophisticated but information-rich analysis of post-translational modifications. Instead of measuring a single metabolite (creatinine), the method uses immunological assays or mass spectrometry to detect modified proteins. This substitution resolves the contradiction by trading increased analytical complexity for dramatically improved early detection capability, enabling diagnosis before kidney damage occurs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for reliable early diagnosis and monitoring of CKD before significant kidney damage occurs, providing a molecular-level diagnosis based on a single measurement and overcoming limitations of existing methods by identifying specific post-translational modifications that are indicative of renal impairment.
Implementation Method 1
using techniques like MALDI-TOF-TOF MS/MS
Implementation Method 2
using techniques like MALDI-TOF-TOF MS/MS and immunological methods
Data Source
Figure 1A~1E
Figure 2A~2F
Figure 3A~3C
AI summary
The present invention relates to methods for diagnosing and/or monitoring the onset or progression of chronic kidney disease (CKD) in a patient by the analysis of post-translational modification of plasma proteins. The present invention provides improved means for diagnosing chronic kidney disease (CKD) especially for the early recognition of CKD.