CDHR3 Receptor Expression for Rhinovirus C Propagation
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Solution Overview
Problem
Current methods fail to efficiently propagate rhinovirus C (RV-C) in conventional cell culture systems, limiting the production of large quantities of virus necessary for extensive biological studies and antiviral research due to the virus's specific receptor requirements and inability to replicate in established cell lines.
Innovation Solution
Expressing the CDHR3 receptor in host cells, such as NCI-H358 and HeLa cells, using lentiviral transduction or transfection with plasmid vectors like pDuet011 and pLX304, enables RV-C propagation by converting non-permissive cells into permissive ones, achieving a ten-fold increase in virus titers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional cell lines (NCI-H358, HEK293T, A549, HeLa) are used for virus propagation, then ease of operation is improved, but productivity deteriorates because these cells cannot support detectable RV-C replication
Solution Approach 1:
The patent changes the biological parameter of the host cell by introducing heterologous CDHR3 receptors through transduction or transfection. This parameter change converts non-permissive conventional cell lines into permissive cells that can support RV-C replication, thereby maintaining ease of operation while dramatically improving productivity through high virus yields
Solution Approach 2:
The patent uses CDHR3 receptor proteins as intermediaries to enable virus-cell interaction. By introducing this intermediary component into conventional cell lines, the system bridges the gap between the virus's specific receptor requirements and the general usability of established cell cultures
2Reliability
If primary airway mucosal tissue snippets are used to maintain RV-C replication, then reliability is improved, but ease of manufacture deteriorates due to requirement for primary human donor samples and differentiation maintenance
Solution Approach 1:
The patent extracts the essential functional component (CDHR3 receptor) from the complex primary tissue system and introduces it into conventional cell lines. This extraction allows the system to maintain reliability for RV-C propagation while eliminating the manufacturing complexities of tissue sourcing and differentiation maintenance
Solution Approach 2:
The patent creates a simplified copy of the permissive tissue environment by expressing key receptors (CDHR3) in conventional cell lines. This copying approach replicates the essential virus-permissive properties without requiring the full complexity of primary tissue cultures
3Ease of operation
If reverse genetics is used to produce RV-C, then ease of operation is improved, but productivity deteriorates due to relatively small quantities of virus produced
Solution Approach 1:
The patent merges the advantages of reverse genetics (ease of operation with established cell lines) with the advantages of high-yield propagation systems. By combining CDHR3 expression in conventional cells with reverse genetics protocols, the system achieves both operational simplicity and high virus productivity
Solution Approach 2:
The patent changes the permissivity parameter of conventional cell lines through CDHR3 introduction, enabling them to support robust RV-C replication from reverse genetics transcripts. This parameter change transforms the system from low-yield to high-yield while maintaining the operational simplicity of using established cell lines
4Reliability
If differentiated airway epithelial cells at air-liquid interface are used, then reliability is improved for RV-C replication, but device complexity increases and productivity decreases due to low throughput
Solution Approach 1:
The patent uses CDHR3 receptor expression as an intermediary to confer permissivity to simple monolayer cultures. This intermediary approach achieves the reliability of differentiated cells for RV-C replication without requiring the complex air-liquid interface system
Solution Approach 2:
The patent segments the essential function (RV-C permissivity) from the complex system (air-liquid interface differentiation) by isolating the key requirement (CDHR3 expression) and implementing it in simple monolayer cultures. This segmentation maintains reliability while eliminating device complexity
Data Source
AI summary
The present invention provides methods of propagating rhinovirus C (RV-C) in a host cell; a host cell comprising an effective amount of a heterologous CDHR3 receptor such that the host cell can support propagation of rhinovirus C; and kits comprising at least one host cell previously unable to support rhinovirus C growth, wherein the host cell comprises a heterologous CDHR3 receptor and a sample of rhinovirus C. Methods of use are also provided.