Imaging Buffer Protects DNA From Light Damage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
DNA sequencing methods that incorporate fluorescently labeled nucleotides often suffer from light-induced damage, leading to signal loss and reduced accuracy in long reads due to the degradation of the extended primer and polynucleotide template.
Innovation Solution
The use of an imaging buffer containing reduced L-glutathione and trolox during the illumination step in DNA sequencing processes minimizes signal loss by protecting the DNA template and extended primer from damage, maintaining fluorescence emission intensity across multiple sequencing cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluorescently labeled nucleotides are incorporated into polynucleotide during sequencing, then DNA sequencing can be performed, but light-induced damage occurs to the extended primer and template, causing signal loss
Solution Approach 1:
The patent introduces an imaging buffer containing reduced L-glutathione and/or trolox as intermediary protective agents. These agents act as mediators between the fluorescent dye and the DNA, absorbing harmful light energy and preventing direct photodamage to the template and extended primer, thereby resolving the contradiction between enabling sequencing and maintaining signal accuracy
Solution Approach 2:
The patent converts the harmful light energy that causes photodamage into beneficial protective effects. The imaging buffer components (reduced L-glutathione and trolox) absorb excess light energy and convert it into protective mechanisms that prevent DNA degradation, transforming the harmful illumination into a controlled process that protects rather than damages the DNA
2Length of moving object
If multiple sequencing cycles are performed to increase read length, then more DNA sequences can be read, but accumulated light-induced damage increases signal loss
Solution Approach 1:
The patent applies preliminary protective action by pre-incubating the DNA template and extended primer with the imaging buffer containing reduced L-glutathione and/or trolox before illumination. This preliminary treatment establishes protective mechanisms that prevent photodamage during subsequent sequencing cycles, enabling longer reads without proportional signal loss
Solution Approach 2:
The imaging buffer serves as a cushioning protective layer that absorbs and dissipates harmful light energy before it can damage the DNA. The reduced L-glutathione and trolox act as sacrificial agents that take the brunt of photodamage, protecting the critical DNA molecules and enabling multiple sequencing cycles with maintained signal integrity
3Reliability
If imaging buffer with protective agents is used to reduce signal loss, then sequencing accuracy is improved, but buffer composition and processing steps become more complex
Solution Approach 1:
The patent modifies the chemical parameters of the imaging buffer by incorporating specific concentrations of reduced L-glutathione (5-200 mM) and/or trolox (0.5-25 mM) at controlled pH levels (7.5-9.0). These parameter changes transform the buffer into a protective medium that reduces signal loss while maintaining manageable compositional complexity through defined concentration ranges
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 reduces signal loss to less than 10% compared to 50% without the imaging buffer, allowing for longer sequencing cycles with maintained accuracy and extended read lengths.
Implementation Method 1
light-induced damage to the template DNA and/or extended primer that occurs during the process of imaging fluorescent dyes used to sequence the template DNA
Data Source
AI summary
Methods and compositions for protecting DNA from light-induced damage and other modifications that occur during DNA sequencing using fluorescent dyes are disclosed.