Segmented Nucleic Acid Probes for HPV Detection
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Solution Overview
Problem
Current nucleic acid hybridization probes for in situ hybridization lack improved detectability and specificity, particularly in detecting human papillomavirus (HPV) genes or transcripts in cervical cell specimens, which hampers accurate diagnosis of cervical carcinomas and precancerous lesions.
Innovation Solution
Development of non-naturally occurring linear nucleic acid probes with a series of complementary segments and non-complementary spacer segments, where the spacer segments are densely labeled with detectable labels, allowing for enhanced detection methods such as fluorescence or immunohistochemistry, and including additional spacer segments at the 5′ and 3′ ends for improved accessibility to secondary detection reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nucleic acid probes are labeled with detectable labels for enhanced detection, then detectability is improved, but the probe structure becomes more complex and may affect hybridization specificity
Solution Approach 1:
The probe is divided into multiple segments: target-complementary segments that maintain hybridization specificity and spacer segments that carry detectable labels. This segmentation allows the labeling function to be separated from the hybridization function, improving detectability without compromising specificity.
Solution Approach 2:
Different parts of the probe have different functions: the target-complementary segments are optimized for specific hybridization to the target sequence, while the spacer segments are optimized for carrying detectable labels. This local differentiation allows each segment to perform its function optimally without interfering with the other.
2Measurement precision
If dense labeling is applied to increase detectability, then signal intensity is improved, but access to detection reagents may be hindered
Solution Approach 1:
Spacer segments act as intermediaries between the target-complementary segments and the detectable labels. These spacers provide physical distance and spatial separation that allows detection reagents to access the labels without steric hindrance from the target-bound portion of the probe, while still maintaining the structural integrity needed for dense labeling.
3Device complexity
If conventional probes are used for HPV detection, then the detection process is simple, but diagnostic accuracy for cervical carcinomas is insufficient
Solution Approach 1:
The probe combines multiple functional elements into a single composite structure: nucleic acid sequences for target recognition, spacer sequences for structural support and accessibility, and detectable labels for signal generation. This composite design integrates multiple functions that collectively improve diagnostic accuracy while maintaining a unified probe structure that simplifies the overall detection process.
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 probes provide enhanced detectability and specificity by allowing dense labeling of spacer segments without affecting sequence specificity, enabling better access for detection reagents, thus improving the accuracy of HPV detection in cervical cell specimens.
Implementation Method 1
a series of first nucleic acid segments consecutively complementary to a preselected nucleic acid target sequence
Data Source
AI summary
The invention provides nucleic acid hybridization probes having improved detectability that include a plurality of first segments consecutively complementary to a target nucleic acid sequence and, between neighboring first segments, a nucleic acid spacer segment which is not complementary to the target nucleic acid sequence and which may include labeled nucleic acid residues. Also provided by the invention are methods for making the probes, methods for using the probes, and compositions of matter that include the probes hybridized to target nucleic acid molecules.