Mutant Line Screening
Mutant Line Screening - Related Videos
14:56
A Genetic Screen to Isolate Toxoplasma gondii Host-cell Egress Mutants
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Cited by 18 •
2012
Forward genetics is a powerful method to unravel the molecular level of how Toxoplasma egresses from its host cell. Protocols are provided to chemically mutagenize parasites, enrich for mutants with defects in induced egress, and validate the phenotype of cloned mutants.
10:50
Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening
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Cited by 10 •
2016
We present a detailed protocol to construct and screen mutant libraries for directed evolution campaigns in Saccharomyces cerevisiae.
11:44
Generation and Multi-phenotypic High-content Screening of Coxiella burnetii Transposon Mutants
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Cited by 28 •
2015
Coxiella burnetii is an obligate intracellular Gram-negative bacterium responsible for the zoonotic disease Q fever. Here we describe methods for the generation of Coxiella fluorescent transposon mutants as well as the automated identification and analysis of the resulting internalization, replication and cytotoxic phenotypes.
13:48
Live Dissection of Drosophila Embryos: Streamlined Methods for Screening Mutant Collections by Antibody Staining
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Cited by 30 •
2009
We describe a streamlined protocol for generating "fillet" preparations of Drosophila embryos of specific genotypes. This protocol allows efficient execution of a variety of genetic screens. It also allows excellent visualization of structures in the late embryo.
03:48
Screening for Genomic Modifications: A Method to Identify CRISPR-Generated Mutants in Drosophila
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2023
This video describes a screening method to identify transgenic Drosophila flies, whose genome was modified using CRISPR-Cas9. CRISPR-Cas9 is a powerful genome-editing tool that revolutionized the way scientists can manipulate an organism's genome. In the example protocol, we will see how to identify CRISPR-generated mutants, in which an insertion of a transactivation sequence replaces the first exon of the branchless (bnl) gene, thus creating a bnl gene-specific driver line, bnl-LexA.
FAQs
Wild-type controls provide the reference state against which a mutant line is evaluated. Researchers can therefore distinguish differences associated with the genetic alteration from variation caused by experimental conditions. Keeping both groups under controlled conditions strengthens interpretation of measurements and helps determine whether a changed trait reflects altered gene function rather than an unrelated environmental difference.
Phenotypic measurements show that a mutant line differs in a visible or measurable response, while genotyping can help connect that difference to a specific genetic change. This link is especially useful when several lines display different traits or when the observed phenotype requires further genetic explanation. Together, phenotype and genotype provide complementary evidence for studying gene function.
Useful measurements may involve development, physiology, behavior, or disease-related responses. The appropriate trait depends on the biological question and the suspected role of the altered gene. Examining these outcomes under controlled conditions allows researchers to identify changes that are relevant to the organism or cell system and to prioritize lines for deeper functional investigation.
Controlled conditions reduce variation unrelated to the genetic difference being studied. This makes comparisons between mutant and wild-type lines more informative and helps researchers attribute measured changes to the altered genetic background. The choice of phenotype and the consistency of the testing environment also influence which biological effects become detectable during screening.
A typical workflow begins by comparing genetically altered lines with suitable wild-type controls under controlled conditions. Researchers then measure relevant phenotypes and use genotyping when a connection to a specific genetic change is needed. Lines showing informative differences can be selected for further study, including investigations of gene mechanisms, biological responses, or useful characteristics.
The approach is useful when researchers need to connect genetic changes with biological traits or responses. In functional genomics and model-organism studies, screening can reveal candidate roles for genes in development, physiology, behavior, or disease-related processes. It also helps identify lines appropriate for follow-up experiments, allowing research to move from an observed difference toward mechanistic investigation.