Single-worm Quantification
Single-worm Quantification - Related Videos
02:44
Single Worm PCR: A Method to Extract and Amplify Genomic DNA
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This video describes a technique to rapidly screen a single nematode for a genetic marker by PCR screening. In the example protocol, we screen for CRISPR-based genome editing.
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An Introduction to Worm Lab: from Culturing Worms to Mutagenesis
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Screening for mutants with phenotypic defects is a straightforward method for identifying genes that function in a given biological process. In this article we describe how to culture free living worms (e.g., Pristionchus pacificus) in the laboratory and show two different mutagenesis methods, EMS and TMP/UV.
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Worms as an Alternative Model Organism
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All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Introduction to C. elegans The nematode (roundworm) Caenorhabditis elegans, commonly known as C. elegans, is a widely used non-vertebrate animal model for studying fundamental biological processes. Because many cellular and...
04:19
Selective Cleaning of Caenorhabditis Worms for Enrichment of Intestinal Microbiota
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Source: Morgan, E., et al. Selective Cleaning of Wild Caenorhabditis Nematodes to Enrich for Intestinal Microbiome Bacteria. J. Vis. Exp. (2021)This video demonstrates a protocol for isolating intestinal bacteria of interest from wild Caenorhabditis worms. The worms are first starved and washed to eliminate residual feeding bacteria from their surface and intestinal lumen while preserving the target microbes. After surface cleaning and multiple crawling steps, the worms are dissected to extract...
05:09
Mechanical Disruption of Individual Worms to Assess Variability in Host-Bacteria Interactions
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2025
Source: Taylor, M. N. et al. Using Single-Worm Data to Quantify Heterogeneity in Caenorhabditis elegans-Bacterial Interactions. J. Vis. Exp. (2022)This video demonstrates the quantification of intestinal bacterial load variability in individual Caenorhabditis elegans through mechanical disruption. It outlines the steps for sample preparation, mechanical disruption, serial dilution, and colony counting to assess differences in intestinal bacterial load among individual worms.
FAQs
Individual measurements preserve phenotypic variation rather than combining all animals into one summary value. This makes it possible to identify rare responses, heterogeneous treatment effects, or differences among animals that would be hidden by an average. The resulting data can distinguish whether a condition affects most worms similarly or produces strongly variable outcomes.
Reliable comparison depends on defining the traits to measure and converting observations into standardized numerical data. Researchers can then compare the same morphological, behavioral, developmental, or physiological features among individuals exposed to different conditions or carrying different genotypes. Consistent measurement makes observed differences easier to interpret as biological effects rather than changes in how traits were recorded.
Linking every measurement to a specific worm preserves the relationship between multiple traits in that individual. A researcher can therefore examine how morphology, behavior, development, physiology, or survival differ among animals instead of treating the population as uniform. This individual-level view helps connect visible phenotypes with possible genetic, cellular, or environmental mechanisms.
A typical workflow first isolates or identifies each animal, then records selected features through microscopy, imaging, or direct observation. Those observations are converted into numerical values using defined measurement criteria, creating a standardized dataset for comparison. The approach can be adapted to morphological, behavioral, developmental, or physiological traits, depending on the biological question.
The method can be applied to traits spanning several levels of biology, including body morphology, movement-related behavior, developmental characteristics, physiological features, and survival. Measuring these outcomes separately for each worm allows investigators to compare individuals across genotypes or treatments and to determine whether a condition influences growth, movement, survival, or another defined phenotype.
Single-worm data provide a way to compare phenotypes among genotypes or treatment conditions while retaining variation between animals. That resolution can expose heterogeneous or uncommon responses and support stronger interpretation of experimental outcomes. In biology, the measurements can also help relate individual traits to genetic, cellular, and environmental mechanisms, rather than relying only on population-level summaries.