Multiplex PCR Assay for Specific Monkeypox Virus Detection

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Solution Overview

Problem

Current PCR-based tests for monkeypox virus (MPXV) lack specificity and sensitivity, failing to distinguish MPXV from other orthopoxviruses and are not FDA-approved, necessitating improved detection methods for accurate diagnosis.

Innovation Solution

A real-time PCR assay targeting multiple regions of the MPXV genome, using specific primers and probes for the F3L and B21R genes, with fluorescence resonance energy transfer (FRET) for detection, ensuring high inclusivity and exclusivity, allowing for rapid and accurate detection in biological samples.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If current PCR-based tests are used for monkeypox detection, then detection can be performed, but specificity is insufficient and they cannot distinguish MPXV from other orthopoxviruses

Engineering Contradiction:

Improvedetection specificityVSAvoiddetection accuracy

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent segments the detection process into multiple independent target regions (F3L gene, B21R gene, and intergenic region) within the MPXV genome. Each target is amplified by specific primers and detected by specific probes, allowing the system to distinguish MPXV from other orthopoxviruses by detecting multiple unique genomic signatures rather than relying on a single non-specific target.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a multi-functional detection system that can simultaneously detect multiple MPXV genomic targets in a single reaction. The assay combines detection of the F3L gene, B21R gene, and intergenic region, providing both specific identification of MPXV and the ability to distinguish it from other orthopoxviruses through pattern recognition across multiple targets.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If current PCR-based tests are used, then detection is possible, but sensitivity is insufficient and they fail to detect rapid virus evolution

Engineering Contradiction:

Improvedetection sensitivityVSAvoidability to detect virus evolution

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent divides the MPXV genome into multiple distinct target regions (F3L gene at positions 12,850-13,050, B21R gene at positions 19,200-19,400, and intergenic region at positions 15,500-15,700), each with its own primer and probe sets. This segmentation allows the system to maintain sensitivity across evolving viral strains by providing multiple detection opportunities, as mutations in one region are unlikely to simultaneously affect all targets.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs multiple primer and probe sets targeting different genomic regions with varying sequence characteristics. This parameter diversity in target selection ensures that at least some targets remain detectable even as the virus evolves, maintaining detection sensitivity across different viral variants and evolutionary stages.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If non-specific PCR tests are used, then broad detection is achieved, but they detect other orthopoxviruses causing false positives

Engineering Contradiction:

Improvedetection coverageVSAvoiddetection specificity

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent segments detection into multiple MPXV-specific target regions (F3L gene, B21R gene, intergenic region) that are uniquely targeted by specific primers and probes. This segmentation allows the assay to maintain broad coverage of MPXV strains while achieving high specificity by requiring detection patterns consistent with MPXV rather than other orthopoxviruses.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by designing primers and probes with specific sequence characteristics optimized for each MPXV target region. Each primer-probe pair is locally optimized to bind specifically to its intended MPXV target while avoiding cross-reactivity with other orthopoxviruses, achieving both coverage and specificity through localized sequence optimization.

Inventive Principle:

Principle #3Local quality

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

The assay provides precise and sensitive detection of MPXV, overcoming rapid virus evolution and non-specificity issues, enabling rapid diagnosis and quantification in clinical settings.

Implementation Method 1

a real-time polymerase chain reaction (PCR) assay to detect and optionally quantify MPXV

Methodology Applied

Scientific EffectPolymerase chain reaction (PCR):

Implementation Method 2

using specific primers and probes for the F3L and B21R genes, with fluorescence resonance energy transfer (FRET) for detection

Methodology Applied

Scientific EffectFluorescence resonance energy transfer (FRET):

Data Source

PatentUS20260055475A1Compositions and methods for detecting monkeypox virus

Publication Date: 2026.02.26 ROCHE MOLECULAR SYSTEMS INC

AI summary

Methods for the rapid detection of the presence or absence of Monkeypox Virus (MPXV) in a biological or non-biological sample are described. The methods can include performing an amplifying step, a hybridizing step, and a detecting step. Furthermore, primers, probes targeting the MPXV F3L gene and the MPXV B21R gene, along with kits are provided that are designed for the detection of MPXV.