Multiplexed Digital Assay Data Exclusion for Target Concentration

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Solution Overview

Problem

Multiplexed digital assays face challenges in accurately determining the concentration of targets due to overlapping signal amplitudes from multiple targets in the same partition, leading to inaccurate data interpretation and concentration calculations.

Innovation Solution

A method is introduced where data from partitions is collected and analyzed to identify populations positive for specific targets, with a subset of data excluding partitions positive for obscuring targets to calculate the level of masked targets, allowing for accurate concentration determination using Poisson statistics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiplexed digital assays are used to detect multiple targets in each partition, then the detection capability and productivity are improved, but the measurement precision deteriorates due to overlapping signal amplitudes from multiple targets

Engineering Contradiction:
Improvedetection capabilityVSAvoidconcentration calculation accuracy
Core Design Contradiction:
ProductivityVSMeasurement precision

Solution Approach 1:

The patent segments the partition populations into distinct groups based on their target content profiles. By clustering partitions with similar amplification patterns together, the method separates overlapping signals from different target combinations, enabling accurate identification and quantification of individual targets even in multiplexed assays where multiple targets coexist in the same partition.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent transforms the analysis from a single-dimensional signal amplitude measurement to a multi-dimensional space by considering amplification patterns across multiple targets and partitions simultaneously. This dimensional expansion allows the resolution of overlapping signals through pattern recognition and clustering algorithms that identify distinct population groups based on their unique target content signatures.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Reliability

If data from all partitions is used for concentration calculation, then the statistical reliability is improved, but the measurement precision deteriorates due to inclusion of overlapping populations that mask individual target signals

Engineering Contradiction:
Improvestatistical reliabilityVSAvoidtarget concentration accuracy
Core Design Contradiction:
ReliabilityVSMeasurement precision

Solution Approach 1:

The patent extracts and isolates specific partition populations that contain unambiguous signals for individual targets by excluding partitions where signal overlap occurs. By identifying and removing contaminated data points from the calculation set, the method maintains statistical reliability from sufficient valid partitions while eliminating the precision-deteriorating effect of overlapping populations.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies partial action by using only the necessary subset of partition data that provides reliable concentration information, rather than forcing the use of all available partitions. This selective data inclusion ensures that concentration calculations are based on clear, unambiguous signals while still maintaining adequate statistical power from the remaining valid partitions.

Inventive Principle:
Principle #16Partial or excessive action

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 enhances the accuracy of target concentration calculations by excluding overlapping populations, improving the resolution of partition populations and enabling precise determination of masked targets in multiplexed assays.

Implementation Method 1

the probe can include a fluorophore that provides a fluorescence signal indicating whether or not the target has been amplified

Methodology Applied
Scientific EffectFluorescence: Fluorescence

Implementation Method 2

Amplification may be conducted via the polymerase chain reaction (PCR), to achieve a digital PCR assay

Methodology Applied
Scientific EffectPolymerase chain reaction:

Data Source

PatentEP2951337B1Multiplexed digital assay with data exclusion for calculation of target levels
Publication Date: 2019.10.02 BIO RAD LABORATORIES INC
  • EP2951337B1 patent drawingFigure 1~2
  • EP2951337B1 patent drawingFigure 3
  • EP2951337B1 patent drawingFigure 3A

AI summary

Digital assay system, including methods and apparatus, for calculating a level of one or more targets. In an exemplary method, data for amplification of a plurality of targets including a first target may be collected from partitions. A level of the first target may be calculated from only a subset of the data that excludes partitions according to target content.