Cited by 157Cellular Mechanics and InteractionsNeurobiology and Insect Physiology ResearchMicro and Nano Robotics

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Enhanced Caenorhabditis elegans Locomotion in a Structured Microfluidic Environment

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Park, Sungsu, Hwang, Hyejin, Nam, Seong-Won, Martinez, Fernando, Austin, Robert H., Ryu, William S.·2008·PLoS ONE

Abstract

BACKGROUND: Behavioral studies of Caenorhabditis elegans traditionally are done on the smooth surface of agar plates, but the natural habitat of C. elegans and other nematodes is the soil, a complex and structured environment. In order to investigate how worms move in such environments, we have developed a technique to study C. elegans locomotion in microstructures fabricated from agar. METHODOLOGY/PRINCIPAL FINDINGS: When placed in open, liquid-filled, microfluidic chambers containing a square array of posts, we discovered that worms are capable of a novel mode of locomotion, which combines the fast gait of swimming with the more efficient movements of crawling. When the wavelength of the worms matched the periodicity of the post array, the microstructure directed the swimming and increased the speed of C. elegans ten-fold. We found that mutants defective in mechanosensation (mec-4, mec-10) or mutants with abnormal waveforms (unc-29) did not perform this enhanced locomotion and moved much more slowly than wild-type worms in the microstructure. CONCLUSION/SIGNIFICANCE: These results show that the microstructure can be used as a behavioral screen for mechanosensory and uncoordinated mutants. It is likely that worms use mechanosensation in the movement and navigation through heterogeneous environments.

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Crossref · 10.1371/journal.pone.0002550

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Figures

Figure 1 C. elegans crawling and swimming. (a) An image of a worm crawling on agar and leaving a sinusoidal trail in a bacterial lawn is shown. Since the worm moves with very little slip, the body follows the curvature of the sinusoidal waves that are propagated down the length of the animal. (b) Multiple exposure of swimming C. elegans in bulk liquid. The image shows the variance of a sequence of 20 images taken at 30 Hz of adult N2 worms. Grey scale level of image indicates variance, with high variance (large movements) indicated by black, and zero variance (small movements) indicated by white. Note the bi-nodal bending motions. Inset shows a series of swimming strokes through a half-cycle.
Figure 1 C. elegans crawling and swimming. (a) An image of a worm crawling on agar and leaving a sinusoidal trail in a bacterial lawn is shown. Since the worm moves with very little slip, the body follows the curvature of the sinusoidal waves that are propagated down the length of the animal. (b) Multiple exposure of swimming C. elegans in bulk liquid. The image shows the variance of a sequence of 20 images taken at 30 Hz of adult N2 worms. Grey scale level of image indicates variance, with high variance (large movements) indicated by black, and zero variance (small movements) indicated by white. Note the bi-nodal bending motions. Inset shows a series of swimming strokes through a half-cycle.CC BY · PubMed Central
Figure 2 Multiple exposure of a worm performing enhanced swimming in an agar post array. (a) The picture contains 10 time-lapse images taken at 5 Hz, with worms swimming right to left. Post diameter is 300 microns, post spacing is 475 microns center-to-center, and post height is 110 microns. Starting at post 1, worm then contacts post 2 at half cycle, and finally post 3 for a complete cycle. Scale bar = 1 mm. (b) an isometric schematic of the worm motion as it moves in the microfabricated grid.
Figure 2 Multiple exposure of a worm performing enhanced swimming in an agar post array. (a) The picture contains 10 time-lapse images taken at 5 Hz, with worms swimming right to left. Post diameter is 300 microns, post spacing is 475 microns center-to-center, and post height is 110 microns. Starting at post 1, worm then contacts post 2 at half cycle, and finally post 3 for a complete cycle. Scale bar = 1 mm. (b) an isometric schematic of the worm motion as it moves in the microfabricated grid.CC BY · PubMed Central
Figure 3 Enhanced swimming speed versus post spacing. The speed of worms moving persistently along the diagonal of the post array as shown in Fig. 3, was calculated by measuring the center of mass of the worm as a function of time and taking the discrete derivative. Error bars indicate the standard error.
Figure 3 Enhanced swimming speed versus post spacing. The speed of worms moving persistently along the diagonal of the post array as shown in Fig. 3, was calculated by measuring the center of mass of the worm as a function of time and taking the discrete derivative. Error bars indicate the standard error.CC BY · PubMed Central
Figure 4 Motility of C. elegans strains on agar plates and in the grid microstructures. A) Oscillation frequency of worms in different environments. Error bars indicate the standard deviation. B) Speed of worms only moving in the forward direction (not turning or bending) was measured. For plate measurements n = 10, and for grid measurements n = 30.
Figure 4 Motility of C. elegans strains on agar plates and in the grid microstructures. A) Oscillation frequency of worms in different environments. Error bars indicate the standard deviation. B) Speed of worms only moving in the forward direction (not turning or bending) was measured. For plate measurements n = 10, and for grid measurements n = 30.CC BY · PubMed Central
Figure 5 Post-array swimming speed versus oscillation frequency. Speed of N2 worms moving only in the forward direction (not turning or bending) was measured.
Figure 5 Post-array swimming speed versus oscillation frequency. Speed of N2 worms moving only in the forward direction (not turning or bending) was measured.CC BY · PubMed Central

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Metadata

Authors
Park, S., Hwang, H., Nam, S.-W., Martinez, F., Austin, R. H., & Ryu, W. S.
Affiliations
  • Ewha Womans University (KR)
  • Princeton University (US)
Corresponding author
Ryu, William S.
Venue
PLoS ONE
Published
2008-06-25
Volume
3
Issue
6
Pages
e2550
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1980172171
Cited by
157
References
18
Citations by year
2026: 6 · 2025: 6 · 2024: 6 · 2023: 10 · 2022: 10 · 2021: 8 · 2020: 8 · 2019: 4 · 2018: 7 · 2017: 7 · 2016: 9 · 2015: 12 · 2014: 8 · 2013: 13 · 2012: 15
FWCI
3.94
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Korea Science and Engineering Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurobiology and Insect Physiology Research
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Micro and Nano Robotics
Keywords
Caenorhabditis elegans, locomotion, swimming, crawling, mechanosensing, mec-4, mec-10, soil environment
MeSH terms
Animals, Locomotion, Caenorhabditis elegans, Microfluidics

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