Fidelity Control
Fidelity Control - Related Videos
13:44
A Method for High Fidelity Optogenetic Control of Individual Pyramidal Neurons In vivo
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Cited by 2 •
2013
The recent development of neuroscience tools that combine genetics and optics, termed "optogenetics", enables control over neural circuit activity with an unprecedented level of spatial and temporal resolution. Here we provide a protocol for integrating in vivo recording with optogenetic manipulation of genetically-defined subsets of prefrontal cortical and subicular pyramidal neurons.
18:10
Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency
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Cited by 40 •
2011
The present article describes the steps required to isolate and characterize RNA polymerase fidelity variants of RNA viruses and how to use mutation frequency data to confirm fidelity changes in tissue culture.
07:08
A High-Fidelity Porcine Model of Orthotopic Heart Transplantation Following Donation after Circulatory Death
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Cited by 2 •
2025
The protocol here describes a high-fidelity porcine model of heart transplantation following donation after circulatory death utilizing ex vivo perfusion of the allograft.
11:45
Creation of a High-Fidelity, Low-Cost, Intraosseous Line Placement Task Trainer via 3D Printing
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2022
We describe a procedure to process computed tomography (CT) scans into high-fidelity, reclaimable, and low-cost procedural task trainers. The CT scan identification processes, export, segmentation, modeling, and 3D printing are all described, along with the issues and lessons learned in the process.
01:21
Control System Problem
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2024
In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function. When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
FAQs
Fidelity control relies on several checkpoints rather than a single accuracy mechanism. Selective molecular recognition first favors the correct nucleotide, tRNA, or codon-anticodon pairing; proofreading then detects and rejects some incorrect matches, while repair pathways remove mismatched DNA bases after copying. Their layered action reduces the chance that one molecular error becomes a permanent change in biological information.
During DNA replication, DNA polymerase proofreading provides an immediate accuracy check on newly copied material. If a mismatch remains, repair pathways can remove the mismatched base, adding a later opportunity for correction. This two-stage arrangement matters because replication errors that escape both checks may contribute to mutation and reduce genome stability.
In protein synthesis, accurate tRNA selection and codon-anticodon pairing limit errors at the point where nucleotide information is interpreted. This protects the correspondence between a gene’s message and its protein product, even though the control problem differs from correcting a mismatched DNA base. Fidelity control therefore operates differently across information-transfer stages.
High accuracy and biological variation are not identical goals. Fidelity control suppresses copying and expression errors, supporting genome stability, whereas occasional changes in genetic information can contribute to mutation and cellular adaptation. Examining this balance helps explain why accuracy mechanisms are important without implying that every change in genetic information is eliminated.
A useful conceptual analysis follows information through replication, transcription, and translation, asking where recognition, proofreading, or correction can act. DNA polymerase proofreading and mismatch repair are examined during copying, while tRNA selection and codon-anticodon pairing are considered during protein synthesis. Comparing these checkpoints shows how accuracy is maintained across successive stages.
Errors that escape proofreading or repair can alter the accuracy of genetic information and contribute to mutation. At the cellular level, this makes fidelity control relevant to genome stability; at the biological level, altered error rates can influence adaptation and disease. The topic therefore connects molecular checkpoints with broader cellular outcomes.