Fusion Protein Cell Proliferation Marker
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Solution Overview
Problem
Current methods for visualizing and analyzing cell cycle progression in eukaryotic cells are inaccurate, particularly in tissues prone to acytokinetic mitosis and endoreduplication, leading to false positives in proliferation assays and inadequate insight into cardiac muscle renewal.
Innovation Solution
A nucleic acid expression construct encoding a fusion protein with a reporter protein and a wild-type destruction signal, localized to subcellular structures like the cell cortex, contractile ring, and midbody, allowing for high-resolution visualization of cytokinesis and cell division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods for visualizing cell cycle progression are used, then the analysis can be performed, but the accuracy is poor leading to false positives in proliferation assays
Solution Approach 1:
The patent employs fluorescent proteins (GFP, RFP, YFP) that emit different colors to mark specific cell cycle phases. The fusion protein changes its fluorescent signal based on its localization during cell cycle progression, enabling accurate visualization and distinction between cell division, acytokinetic mitosis, and endoreduplication through color-coded markers.
Solution Approach 2:
The patent uses a fusion protein as an intermediary marker that combines a reporter protein with a wild-type destruction signal. This intermediary protein localizes to specific subcellular structures (cell cortex, contractile ring, midbody) during cell cycle progression, serving as a mediator to accurately distinguish between different cell division types and eliminate false positives in proliferation assays.
2Loss of information
If conventional proliferation markers are used, then cell proliferation can be detected, but the ability to distinguish between cell division and acytokinetic mitosis or endoreduplication is lost
Solution Approach 1:
The patent segments the cell cycle analysis into distinct phases and types by using a fusion protein that localizes to different subcellular structures at different stages. The reporter protein is segmented into functional domains that correspond to specific cell cycle events, allowing precise differentiation between mitosis, acytokinetic mitosis, and endoreduplication based on spatial localization.
Solution Approach 2:
The fusion protein exhibits local quality variations through its localization to specific subcellular structures (cell cortex, contractile ring, midbody) at different cell cycle stages. This spatial localization pattern provides unique identifying features for each cell division type, enabling precise measurement and distinction that conventional markers cannot achieve.
3Adaptability or versatility
If existing visualization methods are applied to tissues prone to acytokinetic mitosis and endoreduplication, then analysis is possible, but false positives occur and insight into cardiac muscle renewal is inadequate
Solution Approach 1:
The fusion protein serves multiple functions simultaneously: it acts as a proliferation marker, a cell cycle phase indicator, and a distinguisher between cell division types. This multi-functionality allows the same marker system to be applied universally across challenging tissues including cardiac muscle, enabling accurate quantitation of proliferation without false positives while providing insight into tissue-specific processes like cardiac muscle renewal.
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
Enables accurate monitoring and quantitation of cell proliferation and division, distinguishing between cell division and acytokinetic mitosis or endoreduplication, even in tissues challenging for current methods, providing a precise marker for cell cycle progression.
Implementation Method 1
said fusion protein localizes during cell cycle progression to subcellular structures selected from the group consisting of the cell cortex, the contractile ring, and the midbody
Implementation Method 2
the activity of the Cdks is usually terminated by cyclin-dependent proteolytic degradation
Implementation Method 3
an activated enyzme complex recognizes specific amino acid sequences on the protein to be degraded and attaches multiple copies of ubiquitin to it, thereby marking the protein for complete destruction by the 26S proteasome
Data Source
AI summary
A nucleic acid expression construct which encodes a fusion protein includes a reporter protein and a protein with a wild-type destruction signal. A sequence encoding the fusion protein is operably linked to a non-endogenous promoter. The fusion protein localizes during a cell cycle progression to subcellular structures selected from a cell cortex, a contractile ring, and a midbody.