Engineered 293TT Cells for TTV Replication and Virus Production
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Solution Overview
Problem
The ubiquity and heterogeneity of Torque teno viruses (TTVs) have hindered efforts to associate them with disease pathogenesis due to the lack of suitable in vitro culture systems and the difficulty in achieving long-term replication and virus production, making it challenging to investigate their role in cancer and autoimmune diseases.
Innovation Solution
The development of a system for in vitro replication and transcription of TTV isolates using the human embryonic kidney cell line 293TT engineered to express high levels of SV-40 large T antigen, allowing for the propagation of full-length genomes and the characterization of subviral molecules, which can replicate autonomously and infect virus-free cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional cell lines are used for TTV replication, then in vitro transcription can be investigated, but long term replication leading to virus production cannot be achieved
Solution Approach 1:
The patent transforms the cell line parameters by engineering 293TT cells to express high levels of SV40 large T antigen, fundamentally changing the cellular environment to support sustained TTV replication and virus production, resolving the contradiction between replication duration and production reliability
2Loss of information
If TTV infection studies are conducted, then insights into disease pathogenesis can be obtained, but the ubiquity and heterogeneity of TTVs hinder association with specific diseases
Solution Approach 1:
The patent segments the TTV research by isolating and characterizing specific TTV isolates (TTV-HD1a, TTV-HD3a, TTV-HD16a) from different disease contexts, allowing individual isolate-study approaches that can identify disease-specific associations while maintaining the ability to study universal TTV mechanisms
3Ease of operation
If subviral molecules are characterized, then autonomous replication capability can be demonstrated, but the complexity of identifying and analyzing multiple isolates increases
Solution Approach 1:
The patent develops a universal in vitro system using 293TT cells that can handle multiple TTV isolates and subviral molecules simultaneously, providing a multi-functional platform that simplifies the analysis of diverse TTV variants while maintaining the capability to study their specific properties
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 enables the study of TTVs' role in cancer and autoimmune diseases by facilitating the replication and propagation of TTV genomes and subviral molecules, providing insights into their potential involvement in disease pathogenesis and offering novel approaches for prevention, diagnosis, and therapy.
Implementation Method 1
the human embryonic kidney cell line 293TT engineered to express high levels of SV-40 large T antigen, allowing for the propagation of full-length genomes
Implementation Method 2
capable of replicating autonomously upon transfection in 293TT cells
Data Source
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AI summary
Described are rearranged molecules of (a) a specific TT virus sequence and (b) a nucleotide sequence encoding a polypeptide showing homology to mammalian proteins associated with cancer and autoimmune diseases that are capable of replicating autonomously for use in diagnosis, prevention and treatment of diseases like cancer and autoimmunity.