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Microtubule stiffening by the doublecortin-domain protein ZYG-8 contributes to mitotic spindle orientation during zygote division in Caenorhabditis elegans.

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3 matches between paragraphs of the paper and lines of its authors' code, computed by the harvester (lexical-v1). Click a colored paragraph or line to see its counterpart.

The 3 matches
  1. [1] § Materials and methods › M12- Simulation using cytosim ↔ src/sim/fibers/dynamic_fiber.h, lines 1–78 · score 0.61 · dynamic instability, minus ends, plus ends, MAPs, Cytosim, tubulin
  2. [2] § Materials and methods › M12- Simulation using cytosim ↔ src/sim/fibers/dynamic_fiber_prop.h, lines 12–130 · score 0.53 · force velocity relationship, stalled, shrinking, microtubules
  3. [3] § Materials and methods › M12- Simulation using cytosim ↔ src/sim/fibers/classic_fiber.h, lines 1–51 · score 0.52 · dynamic instability, classic, plus ends, Cytosim, tubulin, force

Paper

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The authors' code

C/C++ header · 169 lines · 4.7 KB · cecill-2.1 · 1 match

  1. // Cytosim was created by Francois Nedelec. Copyright 2007-2017 EMBL.
  2. #ifndef DYNAMIC_FIBER_H
  3. #define DYNAMIC_FIBER_H
  4. #include "sim.h"
  5. #include "vector.h"
  6. #include "node_list.h"
  7. #include "fiber.h"
  8. class DynamicFiberProp;
  9. /// A Fiber with discrete growth and dynamic instability at the PLUS_END
  10. /**
  11. This implements the microtubule dynamic instability model proposed by
  12. Brun, Rupp et al. with a 'hard-coded' coupling parameter N=2.
  13. Assembly and disassembly follow discrete steps of size `prop->unit_length`.
  14. The model keeps track of the discrete state of the two terminal units of tubulin.
  15. This leads to 4 different states, which are mapped to [STATE_GREEN, STATE_RED].
  16. The growth speed is reduced under antagonistic force by an exponential factor:\n
  17. <em>
  18. <b>Measurement of the Force-Velocity Relation for Growing Microtubules</b>\n
  19. Marileen Dogterom and Bernard Yurke\n
  20. Science Vol 278 pp 856-860; 1997\n
  21. http://www.sciencemag.org/content/278/5339/856.abstract
  22. </em>
  23. ...and this increases the catastrophe rate:\n
  24. <em>
  25. <b>Dynamic instability of MTs is regulated by force</b>\n
  26. M.Janson, M. de Dood, M. Dogterom.\n
  27. Journal of Cell Biology Vol 161, Nb 6, 2003\n
  28. Figure 2 C\n
  29. </em>
  30. http://www.jcb.org/cgi/doi/10.1083/jcb.200301147
  31. If you use this model, please cite:\n
  32. <em>
  33. <b>A theory of microtubule catastrophes and their regulation</b>\n
  34. Brun L, Rupp B, Ward J, Nedelec F\n
  35. PNAS 106 (50) 21173-21178; 2009\n
  36. http://www.pnas.org/content/106/50/21173
  37. </em>
  38. The predicted mean time until catastrophe is approximately
  39. growing_rate = growing_speed / unit_length
  40. real ctime = growing_rate / ( 3 * hydrolysis_rate * hydrolysis_rate );
  41. The implemented model includes off-rate in the assembly state, as described in:\n
  42. <em>
  43. <b>Random Hydrolysis Controls the Dynamic Instability of Microtubules</b>\n
  44. Ranjith Padinhateeri, Anatoly B Kolomeisky, and David Lacoste\n
  45. Biophys J 102, 1274–1283 (2012)\n
  46. http://dx.doi.org/10.1016/j.bpj.2011.12.059
  47. </em>
  48. This is not implemented:
  49. - the MINUS_END is not dynamic,
  50. - rescues are not included.
  51. .
  52. See the @ref DynamicFiberPar.
  53. // @todo DynamicFiber detach_rate should depend on the state of the subunit
  54. // @todo DynamicFiber should keep the entire state vector of the subunits
  55. Note: A Gillespie simulation method is used.
  56. This class is not fully tested (17. Feb 2011).
  57. @ingroup FiberGroup
  58. */
  59. class DynamicFiber : public Fiber
  60. {
  61. private:
  62. /// assembly during last time-step
  63. real mGrowthP;
  64. real mGrowthM;
  65. /// Gillespie countdown timers for PLUS_END:
  66. real nextGrowthP;
  67. real nextHydrolP;
  68. real nextShrinkP;
  69. /// Gillespie countdown timers for MINUS_END:
  70. real nextGrowthM;
  71. real nextHydrolM;
  72. real nextShrinkM;
  73. /// state of units near the PLUS_END: [0] is terminal, [1] is penultimate unit
  74. unsigned unitP[3];
  75. /// dynamic state of PLUS_END
  76. state_t mStateP;
  77. /// state of units near the MINUS_END
  78. unsigned unitM[3];
  79. /// dynamic state of MINUS_END
  80. state_t mStateM;
  81. /// calculate dynamic state from unit states near PLUS_END
  82. state_t calculateStateP() const;
  83. /// calculate dynamic state from unit states near MINUS_END
  84. state_t calculateStateM() const;
  85. public:
  86. /// the Property of this object
  87. DynamicFiberProp const* prop;
  88. /// constructor
  89. DynamicFiber(DynamicFiberProp const*);
  90. /// destructor
  91. virtual ~DynamicFiber();
  92. //--------------------------------------------------------------------------
  93. /// return assembly/disassembly state of MINUS_END
  94. state_t dynamicStateM() const;
  95. /// return assembly/disassembly state of PLUS_END
  96. state_t dynamicStateP() const;
  97. /// change state of MINUS_END
  98. void setDynamicStateM(state_t s);
  99. /// change state of PLUS_END
  100. void setDynamicStateP(state_t s);
  101. /// length increment at MINUS_END during last time-step
  102. real freshAssemblyM() const { return mGrowthM; }
  103. /// length increment at PLUS_END during last time-step
  104. real freshAssemblyP() const { return mGrowthP; }
  105. //--------------------------------------------------------------------------
  106. /// simulate dynamic instability of PLUS_END
  107. int stepPlusEnd();
  108. /// simulate dynamic instability of MINUS_END
  109. int stepMinusEnd();
  110. /// monte-carlo step
  111. void step();
  112. //--------------------------------------------------------------------------
  113. /// write to Outputter
  114. void write(Outputter&) const;
  115. /// read from Inputter
  116. void read(Inputter&, Simul&, ObjectTag);
  117. };
  118. #endif

dynamic_fiber.h, under cecill-2.1 · at the source

Overview

  1. CNRS, Univ Rennes, IGDR (Institut de Génétique et Développement de Rennes) – UMR 6290, Rennes, France
Journal: PLoS genetics, volume 22, issue 6, article e1012196
Dates: received 21 October 2025; accepted 1 June 2026; published online 29 June 2026
Type: Research article · Language: English
License: CC BY
Identifiers: DOI 10.1371/journal.pgen.1012196 · PMID 42371962 · PMCID PMC13340844 · OpenAlex W4404918954
Open access: gold, a free copy (OpenAlex)
Status: code verified
Categories: C. elegans (organism), cellular / molecular (subfield)
Methods: Spectral & time-frequency, Statistics, Machine learning, Preprocessing, Evoked potentials, Connectivity, fMRI & imaging, Smoothing, state filtering, decompositions
MeSH: Caenorhabditis elegans*, Caenorhabditis elegans Proteins*, Microtubule-Associated Proteins*, Microtubules*, Spindle Apparatus*, Zygote*, Animals, Mitosis, Mutation, RNA Interference (* major topic)
Journal subjects: Biology and Life Sciences, Cell Biology, Cellular Structures and Organelles, Cytoskeleton, Microtubules, Developmental Biology, Embryology, Embryos, Centrosomes, Cell Processes, Cell Cycle and Cell Division, Anaphase, Genetics, Epigenetics, RNA interference, Gene expression, Genetic interference, Biochemistry, Nucleic acids, RNA, Research and Analysis Methods, Imaging Techniques, Fluorescence Imaging, Animal Studies, Experimental Organism Systems, Model Organisms, Caenorhabditis Elegans, Animal Models, Organisms, Eukaryota, Animals, Invertebrates, Nematoda, Caenorhabditis, Zoology, Cellular Types, Animal Cells, Germ Cells, OVA, Zygotes
Topic: Microtubule and mitosis dynamics (Cell Biology, Biochemistry, Genetics and Molecular Biology), according to OpenAlex
Funding: Ligue Contre le Cancer (PhD thesis funding, 3 years, CARID grant, Finistère commitee, Ille et Vilaine & Deux-Sèvres committees, 2019, Côtes d’Armor & Ille-et-Vilaine committees, 2021); Région Bretagne (ARED 2025, PhD thesis funding); Agence Nationale de la Recherche (French National Research Agency) (ANR-22-CE45-001601); Université de Rennes (Défis scientifiques, 2020)
Citations: cited by 1 paper (Europe PMC); 204 references in the paper

Abstract

In the Caenorhabditis elegans zygote, mutations in zyg-8DCLK1, the sole Doublecortin-family member, disrupt mitotic spindle positioning, as seen by immunofluorescence. Doublecortin proteins bind microtubules and are thought to stabilise or rigidify them. In the zygote, ZYG-8 only modestly affects microtubule growth and nucleation. We thus investigated whether these moderate dynamic perturbations alone could explain the spindle mispositioning observed in zyg-8 mutants. Using three complementary genetic perturbations—RNAi-mediated depletion of ZYG-8, its overexpression, and the thermosensitive zyg-8(or484ts) mutant (that disrupts microtubule binding)—we observed altered spindle pole oscillations and changes in microtubule cortical-contact behaviour, indicative of impaired cortical forces. Importantly, these phenotypes could not be fully explained by previously reported alterations in microtubule dynamics, suggesting an additional mechanism. Our findings indicate that ZYG-8 increases microtubule rigidity: ZYG-8 depletion or mutation led to more frequent microtubule bending and higher curvature and tortuosity. Simulations confirmed that reduced rigidity prolongs cortical contact lifetimes, an effect we experimentally observed in zyg-8(RNAi) embryos. Using custom biophysical assays, we showed that microtubule softening in zyg-8(RNAi) embryos and zyg-8 mutants reduced the efficiency of centring forces, leading to exaggerated spindle-pole oscillations. In mutants, the largest oscillations caused spindle poles to move closer to the cell periphery, preventing re-centring and resulting in spindle mispositioning and misorientation during late anaphase. Importantly, reducing cortical pulling forces rescued orientation defects, highlighting the importance of balanced pulling-pushing forces for proper spindle positioning. We propose that sufficient microtubule rigidity is essential for generating effective cortical pushing forces, potentially in synergy with other microtubule properties, which contribute to centring mechanisms that ensure accurate spindle orientation in late mitosis. Given that DCLK1 is frequently deregulated in human cancers and that accurate spindle positioning is essential for maintaining cell proliferation-differentiation balance, these findings may have implications for understanding how disruptions in microtubule mechanics contribute to carcinogenesis.

Reproduced under the paper's license (CC BY), from the paper cited above.

Repository

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Zenodo 14246919

License: cecill-2.1
State: the link answers, verified on 27 September 2026
Evidence: files inventoried
Size: 1 file
Software Heritage: not checked
Found in: the text, “M12- Simulation using cytosim”
Not found: README, license file, CITATION.cff, environment file, tests, continuous integration, documentation
Tools: Matplotlib (2 files), NumPy (1 file)
Availability: 1 check, the latest on 27 September 2026: the link answers (HTTP 200)
  • 27 September 2026: the link answers (HTTP 200)
514 files

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What the map holds:

  • 1 repository of the authors' code, each at its verified commit, with its license and how the link was found in the paper;
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  • 3 matches between paragraphs of the paper and lines of the code (method lexical-v1);
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Data

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Data Availability

All relevant data are within the manuscript and its Supporting Information files. Computational developments are shared on Zenodo, with the DOIs indicated in Methods.

Reproduced under the paper's license (CC BY), from the paper cited above.

Versions

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Version 1, 27 September 2026: the first record

Recorded: type, language, journal, volume, issue, pages, dates, 9 authors, 10 MeSH terms, 4 funders, 198 references.

Cite

This paper

Cueff, L., Schmitt, L., Huet, E., Pastezeur, S., Coquil, M., Savary, T., Sénard, A., Pécréaux, J., & Bouvrais, H. (2026). Microtubule stiffening by the doublecortin-domain protein ZYG-8 contributes to mitotic spindle orientation during zygote division in Caenorhabditis elegans. PLoS genetics, 22(6), e1012196. https://doi.org/10.1371/journal.pgen.1012196

BibTeX

@article{cueff2026microtubule,
author = {Cueff, Louis and Schmitt, Loïc and Huet, Ewen and Pastezeur, Sylvain and Coquil, Méline and Savary, Talia and Sénard, Anouk and Pécréaux, Jacques and Bouvrais, Hélène},
title = {{Microtubule stiffening by the doublecortin-domain protein ZYG-8 contributes to mitotic spindle orientation during zygote division in Caenorhabditis elegans}},
journal = {PLoS genetics},
year = {2026},
month = jun,
volume = {22},
number = {6},
pages = {e1012196},
publisher = {PLOS},
issn = {1553-7390},
doi = {10.1371/journal.pgen.1012196},
url = {https://doi.org/10.1371/journal.pgen.1012196},
pmid = {42371962},
pmcid = {PMC13340844}
}

RIS

TY - JOUR
AU - Cueff, Louis
AU - Schmitt, Loïc
AU - Huet, Ewen
AU - Pastezeur, Sylvain
AU - Coquil, Méline
AU - Savary, Talia
AU - Sénard, Anouk
AU - Pécréaux, Jacques
AU - Bouvrais, Hélène
TI - Microtubule stiffening by the doublecortin-domain protein ZYG-8 contributes to mitotic spindle orientation during zygote division in Caenorhabditis elegans
T2 - PLoS genetics
J2 - PLoS Genet
PY - 2026
DA - 2026/06/29
VL - 22
IS - 6
SP - e1012196
SN - 1553-7390
PB - PLOS
DO - 10.1371/journal.pgen.1012196
UR - https://doi.org/10.1371/journal.pgen.1012196
LA - en
ER -

CSL-JSON

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