Rescue Overexpression Experiments
Rescue Overexpression Experiments - Related Videos
12:34
Adenofection: A Method for Studying the Role of Molecular Chaperones in Cellular Morphodynamics by Depletion-Rescue Experiments
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Cited by 7 •
2016
We describe a method for depletion-rescue experiments that preserves cellular integrity and protein homeostasis. Adenofection enables functional analyses of proteins within biological processes that rely on finely tuned actin-based dynamics, such as mitotic cell division and myogenesis, at the single-cell level.
04:46
A Novel Rescue Technique for Difficult Intubation and Difficult Ventilation
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2011
We describe a technique to maintain oxygenation and ventilation using an endotracheal tube inserted nasally to the level of the naso-pharynx while sealing the mouth and nares for successful positive pressure ventilation.
04:38
A Novel Technique of Rescuing Capsulorhexis Radial Tear-out using a Cystotome
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Cited by 4 •
2011
Capsulorhexis is an important step in phacoemulsification surgery. A surgeon creates a continous curvilinear tear on the anterior lens capsule by controlling the tearing vector forces. A peripherally extended tear is a serious complication. This video demonstrates a novel technique of rescuing capsular radial tear out using a cystotome.
08:12
Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
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Cited by 5 •
2011
We describe how to perform retroviral or lentiviral infections of overexpression or shRNA-containing constructs in the human Ramos B-cell line and how to measure somatic hypermutation in these cells.
05:16
Detecting Histone Modifications in Yeast Cells with Neurodegenerative Protein Overexpression
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2025
Source: Bennett, S. A., et al., Characterizing Histone Post-translational Modification Alterations in Yeast Neurodegenerative Proteinopathy Models. J. Vis. Exp. (2019).This video demonstrates the procedure of assessing histone modifications in yeast cells overexpressing neurodegenerative proteins. The steps include cell lysis, centrifugation, electrophoresis, membrane transfer, and antibody-based detection of modified histones.
FAQs
The key test is whether increasing the candidate gene’s expression alleviates the phenotype in the mutant background. Improvement supports the idea that reduced activity of that gene contributes to the defect, rather than the phenotype arising entirely from an unrelated change. The strength and consistency of recovery also provide information about how closely gene activity is linked to the observed trait.
Complete, partial, or absent recovery can reflect different dosage requirements. Partial rescue may indicate that the introduced expression level does not fully replace normal activity, whereas recovery only at elevated expression can suggest dosage sensitivity. Comparing the degree of phenotypic improvement under defined conditions therefore adds information beyond a simple rescued versus not-rescued result.
A rescue outcome can place the tested gene within a broader genetic pathway. If increased expression compensates for a mutant defect, the gene product may act in a functionally connected process or influence a downstream outcome. Comparisons among different mutant backgrounds can further indicate whether the tested gene has relationships with other pathway components, although the experiment alone does not establish every regulatory step.
Rescue may depend on where the gene product is increased, not only on how much is produced. Recovery in one tissue but not another can indicate that the gene is required in a particular tissue or that expression must occur in a specific biological context. This distinction helps separate a general dosage effect from a localized functional requirement.
Researchers begin with a mutant background showing the phenotype of interest, then introduce an expression construct or transgene designed to increase production of the tested gene. They assess the resulting phenotype under defined experimental conditions and compare it with the relevant mutant state. The comparison determines whether elevated gene expression produces measurable compensation and how extensive that recovery is.
Interpretation depends on maintaining defined conditions while comparing the mutant background with the overexpression condition. The expression construct or transgene, the level of increased gene activity, and the context in which the phenotype is measured can all affect the result. Controlling these factors helps determine whether differences reflect gene function rather than inconsistent experimental conditions.
Successful recovery strengthens the assignment of a functional role to the tested gene, while failure to recover the phenotype may indicate that increased expression is insufficient or that the defect is not compensated by that gene. The experiment is also useful for distinguishing loss-of-function effects from secondary changes and for examining regulatory relationships within genetic pathways.