Nematode Genotyping
Nematode Genotyping - Related Videos
06:28
Screening Cotton Genotypes for Reniform Nematode Resistance
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2019
Here, a protocol is presented for the rapid non-destructive screening of cotton genotypes for reniform nematode resistance. The protocol involves visually examining the roots of nematode-infected cotton seedlings to determine infection response. The vegetative shoot from each plant is then propagated to recover plants for seed production.
08:27
Mouse Genotyping
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2023
Even though the human genome was mapped over 10 years ago, scientists are still far from understanding the function of every human gene! One way to evaluate how a gene functions is to disrupt the sequence encoding it and then evaluate the impact of this change (the phenotype) on the animal’s biology. This approach is commonly used in the mouse (Mus musculus), since it shares a high degree of genetic similarity with humans. To track the animals bearing genetic changes over several generations,...
08:23
SNP Genotyping
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2023
Single nucleotide polymorphisms, or SNPs, are the most common form of genetic variation in humans. These differences at individual bases in the DNA often do not directly affect gene expression, but in many cases can still be useful for locating disease-associated genes or for diagnosing patients. Numerous methodologies have been established to identify, or “genotype”, SNPs.JoVE’s introduction to SNP Genotyping begins by discussing what SNPs are and how they can be used to identify...
09:02
Visualizing Bacteria in Nematodes using Fluorescent Microscopy
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Cited by 20 •
2012
To study the mutualism between Xenorhabdus bacteria and Steinernema nematodes, methods were developed to monitor bacterial presence and location within nematodes. The experimental approach, which can be applied to other systems, entails engineering bacteria to express the green fluorescent protein and visualizing, using fluorescence microscopy bacteria within the transparent nematode.
06:18
Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR
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2025
This protocol provides a method for measuring crossover frequencies and distribution during meiosis in Caenorhabditis elegans. Single-nucleotide polymorphism genotyping with real-time PCR was used to determine the origin of the chromosomes. The 4-point mapping allowed to determine the crossover distributions of the left-arm, center, and right-arm regions of each chromosome. ...
FAQs
Genotyping distinguishes closely related nematodes by targeting genomic regions that vary among species, strains, or individuals. These informative regions provide sequence differences or marker patterns that can be compared across samples. The resulting variation is not merely an identification signal: it also supplies evidence for relatedness, inheritance, and population structure, depending on the biological question.
Polymerase chain reaction, or PCR, increases the amount of a selected genomic region so it can be examined more readily. Its value in this workflow comes from focusing analysis on informative DNA rather than treating the entire genome as the primary comparison. Researchers can then evaluate the amplified region through sequence data or genetic markers to separate related organisms.
Sequence data and genetic markers offer complementary ways to compare nematode samples. Sequence analysis examines the information within an amplified region, whereas marker-based analysis uses distinguishing genetic patterns. Both can support identification, but the choice depends on whether the study emphasizes resolving related organisms, examining inheritance, or describing variation within a population.
Variation provides a basis for connecting genotype with biological traits. In nematode studies, comparisons can help investigate differences in development, behavior, environmental adaptation, or susceptibility to infection. The same genetic information can also support phylogenetic analysis and population studies, allowing researchers to relate observed traits to lineage or population-level patterns.
A typical workflow begins by extracting genomic DNA from the nematode material. Researchers then use PCR to amplify informative regions and analyze the resulting sequence data or genetic markers. Interpretation compares the genetic results among samples to identify species, strains, or individual genotypes and to address questions about inheritance, relatedness, or population structure.
Researchers apply the method when they need to distinguish related nematodes or characterize genetic differences among samples. It is useful for species and strain identification, individual genotype characterization, phylogenetic analysis, and population studies. These applications make genotyping relevant whenever biological conclusions depend on knowing whether observed organisms share or differ in genetic background.
In model nematodes, genotyping helps characterize the genetic backgrounds used in developmental and disease research. Researchers can examine whether samples represent distinct strains or genotypes and then relate those differences to development, behavior, or susceptibility to infection. This connection strengthens interpretation of experimental results by placing biological observations alongside genetic variation.