Name: Simple and Accessible Egg-Hatching Assays in Caenorhabditis elegans: Adaptable Formats for Drug Screening (Video) | JoVE Journal
Uploaded: 2026-07-03T14:40:00.000+00:00
Duration: 8 min 11 s
Description: Learn adaptable egg-hatching assays in Caenorhabditis elegans for drug screening and developmental biology. This method compares microcentrifuge tube, agar-based, and multiwell formats to support scalable research and education.

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This work was supported by Universidad Nacional del Sur (PGI 24/B366 to GH). We thank WormBase (https://wormbase.org). Strains were provided by the Caenorhabditis Genetics Center (CGC), which is funded by NIH Office of Research Infrastructure Programs (P40 OD010440).

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The authors declare that they have no conflicts of interest with the contents of this article.

This study presents a simple and adaptable platform for egg-hatching assays in Caenorhabditis elegans, structured around three complementary experimental formats that differ in control, exposure dynamics, and scalability. Rather than defining a single optimal protocol, our results support the view that egg-hatching assays should be considered a flexible methodological framework adaptable to specific experimental objectives.
The microcentrifuge tube-based format provides a highly contr...

Egg-hatching assays (EHA) have long been established as a cornerstone methodology in nematology for evaluating ovicidal activity and early developmental effects of chemical compounds. Originally developed for parasitic nematodes, these assays quantify the inhibition of embryonation or larval emergence under controlled in vitro conditions, providing robust and biologically relevant endpoints such as hatching percentage or concentration&#8211;response analysis (e.g., EC50 or IC50)1,2,3,4,5,6,7.
Classical egg-based approaches in parasitic nematodes such as Haemonchus contortus and Trichostrongylus colubriformis have been widely used to evaluate the efficacy of synthetic drugs and natural products, as well as to monitor anthelmintic resistance1,2,6,8,9,10. These methodologies encompass a range of readouts, from direct assessment of egg viability and hatching to the evaluation of larval development following fecal culture. Collectively, they have played a central role in linking drug exposure to parasite reproductive output and transmission potential. However, these approaches often require complex sample preparation from infected hosts, extended incubation periods, and specialized infrastructure, which can limit their accessibility, scalability, and inter-laboratory reproducibility.
The use of Caenorhabditis elegans as a model organism has emerged as a powerful strategy to overcome several limitations associated with parasitic nematodes. Its short life cycle, genetic tractability, ease of culture, and the conservation of key molecular targets shared with parasitic species make it particularly suitable for pharmacological, toxicological, and developmental studies. Importantly, embryogenesis in C. elegans is rapid and highly reproducible, allowing egg viability and hatching assays to be used as quantitative and reliable readouts of early developmental processes and their disruption by xenobiotics11,12,13,14,15,16,17.
In addition, the availability of well-characterized mutant strains has enabled mechanistic insights into drug action and resistance. Previous studies have shown that resistance to bioactive compounds can emerge in a stage-dependent manner, with embryonic and larval stages displaying differential sensitivity. For example, alterations in glutamatergic signaling have been associated with resistant phenotypes in larvae, while egg hatching remained unaffected14,18,19,20. This highlights the stage-specific nature of drug sensitivity and suggests that embryonic stages may involve distinct targets or differential accessibility compared to later developmental stages.
Beyond parasitology, egg viability assays in C. elegans have become increasingly relevant in toxicology and early drug discovery. These assays have been applied not only to assess anthelmintic activity but also to evaluate developmental toxicity and drug-induced embryonic defects, with outcomes that can correlate with higher-organism toxicity profiles15,16. At the same time, the presence of the eggshell introduces important biological constraints, as it acts as a protective and selective permeability barrier surrounding the embryo21,22. As a result, some bioactive molecules may fail to reach the embryo despite showing activity at later developmental stages14,19,23,24. Access to the embryo is therefore likely to depend on the physicochemical properties of each compound, including molecular size and polarity. This may contribute to differences between the activity observed in egg-hatching assays and that in later developmental stages. This distinction underscores the importance of clearly defining both the experimental context and the biological endpoint being measured.
Methodologically, egg-hatching assays in Caenorhabditis elegans have been implemented using a broad range of experimental formats, including liquid incubation of synchronized eggs, direct exposure to drug-containing agar plates, and multiwell-based assays adapted for medium- to high-throughput screening11,13,14,16,19,23,24.
Liquid-based and microplate formats have been widely adopted in pharmacological screening studies, as they provide homogeneous exposure conditions, facilitate precise control of drug concentrations, and allow quantitative analysis of concentration&#8211;response relationships. In parallel, comparable multiwell-based strategies have been extensively developed for parasitic nematodes, ranging from conventional 96-well plate assays to ultra-high-throughput platforms using 384-well formats4,5. Together, these approaches highlight the versatility and scalability of egg-hatching assays across different nematode species and their adaptability to diverse experimental settings, from small-scale mechanistic studies to large-scale compound screening.
Each format presents distinct advantages and limitations in terms of experimental control, reproducibility, throughput, and accessibility. Liquid-based assays provide homogeneous exposure conditions and are well-suited for quantitative pharmacological analyses, whereas agar-based assays allow continuous exposure throughout development but introduce variability related to drug diffusion and bioavailability. Multiwell formats, in turn, enable parallelization and reduced reagent consumption, aligning with modern screening strategies.
Despite widespread use, egg-hatching assays are often presented as fixed protocols rather than as a flexible methodological framework. Direct comparisons between formats are scarce, and guidance on selecting the most appropriate configuration for specific applications, ranging from mechanistic studies to high-throughput screening or teaching environments, remains limited.
In this study, we propose a simple, accessible, and adaptable platform for egg-hatching assays in C. elegans, integrating and comparing three experimental configurations: (i) controlled incubation in microcentrifuge tubes followed by seeding on agar plates, (ii) direct exposure on drug-containing agar plates, and (iii) multiwell-based liquid assays.
By systematically evaluating these configurations, we aim to establish a practical framework that highlights the trade-offs between experimental control, simplicity, and scalability. This integrated perspective bridges classical parasitological methodologies with modern model-based screening approaches, positioning egg-hatching assays not as a single standardized technique, but as a versatile platform adaptable to diverse research contexts, including anthelmintic discovery, toxicological assessment, developmental biology, and educational applications.

<table><tbody><tr><td>Bacteriological Agar</td><td>Britania&amp;nbsp;</td><td>B0101406</td><td>should be prepared fresh (1.7 gr in 100 mL&amp;nbsp;H&lt;sub&gt;2&lt;/sub&gt;O)</td></tr><tr><td>Bleach solution</td><td>N/A</td><td>N/A</td><td>1.2 % (v/v) NaOH and 0.5 M NaOH</td></tr><tr><td>Centrifuge</td><td>ThermoScientific.&amp;nbsp;</td><td>Sorvall ST16R.&amp;nbsp;&amp;nbsp;</td><td></td></tr><tr><td>Centrifuge</td><td>BiofugePICO to eppendorf tube</td><td>Heraeus 75003235&amp;nbsp;&amp;nbsp;</td><td></td></tr><tr><td>Digital camera</td><td>ToupCam&amp;nbsp;</td><td>TP605100A</td><td>Industrial digital camera. Adjustabe focal length USB 2.0</td></tr><tr><td>DMSO</td><td>BioBasic&amp;nbsp;</td><td>RAS#7-68-5</td><td>MW: 78,13</td></tr><tr><td>Linalil Acetate&amp;nbsp;</td><td>SIGMA</td><td>No.CAS: 115-95-7</td><td>should be prepared fresh</td></tr><tr><td>Lysogeny broth (LB) medium</td><td>N/A</td><td>N/A</td><td>10 g Bacto-tryptone, 5 g yeast extract, 10 g NaCl to 1 L destilled water&amp;nbsp;</td></tr><tr><td>M9 Buffer&amp;nbsp;</td><td>N/A</td><td>N/A</td><td>3 g KH&lt;sub&gt;2&lt;/sub&gt;PO&lt;sub&gt;4&lt;/sub&gt;, 6 g Na&lt;sub&gt;2&lt;/sub&gt;HPO&lt;sub&gt;4&lt;/sub&gt;, 5 g&amp;nbsp; NaCl, 0,25 g MgSO&lt;sub&gt;4&lt;/sub&gt; to 1 L destilled water</td></tr><tr><td>Mini Rotator &amp;nbsp;</td><td>BioSan</td><td>Bio RS-24</td><td></td></tr><tr><td>Nematode Growth Medium (NGM)</td><td>N/A</td><td>N/A</td><td>3 g NaCl, 17 g agar, 2,5 g&amp;nbsp; Bacto-Peptone to 1 L destilled water. Sterilize by autoclaving. Supplemented 1 mL cholesterol (5 mg/mL),&amp;nbsp; 1 mL CaCl2 (1 M) , 25 mL potassium phosphate buffer (1 M, pH 6.0) and 1 mL&amp;nbsp; MgSO4 (1 M)</td></tr><tr><td>Petri Dish (3 - 5 mm)</td><td>ThermoScientific. Nunclon DeltaSurface&amp;nbsp;</td><td>153066</td><td></td></tr><tr><td>Petri Dish (90 mm x 15 mm)</td><td>ExtraGene&amp;nbsp;</td><td>1026160305</td><td>For laboratory use only, Polystyrene.&amp;nbsp;</td></tr><tr><td>Pipette</td><td>Fisherbrand</td><td>N/A</td><td></td></tr><tr><td>SigmaPlot 12.0</td><td>Systat Software</td><td>N/A</td><td>Version 12.0</td></tr><tr><td>Stereomicroscope</td><td>ARCANO</td><td>ZTX-T 1:4 LED</td><td>Trinocular stereomicroscope (10x&amp;ndash;40x total magnification; LED incident and transmitted illumination)</td></tr><tr><td>Sucrose&amp;nbsp;</td><td>Laboratorio Cicarelli&amp;nbsp;</td><td>Art 841</td><td>60 % (v/v) sucrose&amp;nbsp;</td></tr><tr><td>Tissue culture plate 96 well&amp;nbsp;</td><td>Biofil&amp;nbsp;</td><td>TCP 012096</td><td>Polystyrene, Low Evaporation Lid.&amp;nbsp;</td></tr><tr><td>ToupView&amp;nbsp;</td><td>ToupTek Photonics</td><td>N/A</td><td></td></tr><tr><td>Transcinnamaldehyde (TCA)</td><td>Santa Cruz Biotechnology&amp;nbsp;</td><td>J1712</td><td>Should be prepared fresh</td></tr></tbody></table>

simple and accessible egg-hatching assays in caenorhabditis elegans: adaptable formats for drug screening

Simple and Accessible Egg-Hatching Assays in Caenorhabditis elegans: Adaptable Formats for Drug Screening

Egg-hatching assays (EHA) are widely used to evaluate the effects of chemical compounds on early developmental stages of nematodes, particularly in anthelmintic research. However, existing methodologies vary substantially in format, complexity, and reproducibility, and are often presented as fixed protocols rather than adaptable experimental frameworks. In this study, we establish a simple, accessible, and flexible platform for egg-hatching assays in Caenorhabditis elegans by integrating and directly comparing three experimental configurations: (i) controlled incubation in microcentrifuge tubes followed by seeding on agar plates, (ii) direct exposure on drug-containing agar plates, and (iii) multiwell-based liquid assays. Two representative compounds were used to illustrate the assay: one that inhibits egg hatching and one that has no detectable effect. Each configuration provides distinct advantages in terms of experimental control, throughput, and accessibility. The microcentrifuge tube-based approach enables precise control of drug exposure and supports quantitative pharmacological analyses. Agar-based assays offer a simplified and low-cost alternative suitable for continuous exposure and educational settings. Multiwell formats enable scalable, standardized screening consistent with modern drug discovery pipelines. By directly comparing these formats, we show how methodological choices influence assay reproducibility, drug exposure dynamics, and biological interpretation, particularly in relation to stage-specific factors such as the protective role of the eggshell and developmental variation in molecular target expression. Overall, this work establishes egg-hatching assays in C. elegans as a versatile and scalable platform adaptable to diverse applications, including anthelmintic screening, toxicological assessment, developmental studies, and teaching laboratories, thereby facilitating broader and more rational use of this methodology.

TCA produced clear concentration-dependent inhibition of egg hatching across all experimental formats, as shown in Figure 1. Representative concentration&#8211;response curves are presented for each assay configuration: microcentrifuge tubes (Figure 1A), direct exposure on agar plates (Figure 1B), and multiwell plates (Figure 1C).
The estimated IC&#8325;&#8320; values were 0....

This study presents a flexible and standardized egg-hatching assay platform in Caenorhabditis elegans that integrates multiple experimental formats. The approach enhances reproducibility, scalability, and accessibility, enabling robust evaluation of drug effects and developmental processes, while remaining cost-effective and easily adaptable for both research applications and educational settings.

Egg-hatching assays (EHA) are widely used to evaluate the effects of chemical compounds on early developmental stages of nematodes, particularly in ...

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Learn adaptable egg-hatching assays in Caenorhabditis elegans for drug screening and developmental biology. This method compares microcentrifuge tube, agar-based, and multiwell formats to support scalable research and education.

Simple and Accessible Egg-Hatching Assays in Caenorhabditis elegans: Adaptable Formats for Drug Screening

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