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Single DNA biophysics and biosensing

We develop single molecule approaches to characterize the dynamics of macromolecular assemblies of nucleic acids with basic science and application-driven objectives.




The first objective comprises the physical and biochemical principles of the organization of the bacterial nucleoid, in relation with genome repair functions in particular, and the role of repeated sequences in molecular mechanisms altered by cancer.  



The second objective evaluates the combination of our high-throughput Tethered Particle Motion technique with recognition elements as a sensor for water micropollutants, biomarkers and screening of therapeutics ligands.

Current Fundings


University Paul Sabatier 2021-2023


Personnel involved

Serge Mazères, Laurence Salomé, Catherine Tardin



Vincent Ecochard IPBS, Toulouse

Dennis Gomez  IPBS, Toulouse

Nicolas Destainville and Manoel Manghi, LPT, Toulouse

Philippe Rousseau and François Cornet, CBI-LMGM, Toulouse

Raphael Mourad, CBI-MCD, Toulouse

Jean-Marc Escudier, Cécile Dehoux-Baudouin, Béatrice Gerland, Stéphanie Ballereau, SPCMIB, Toulouse

Marc Joyeux, LiPhy, Grenoble

Aurélien Olichon, DéTROI, La Réunion


Selected publications

  • Serres S., Tardin C. and Salomé L. (2020) Single-molecule sensing of DNA intercalating drugs in water Anal. Chem. 92(12):8151-8158 doi: 10.1021/acs.analchem.0c00184. 
  • Soukarié D., Ecochard V. and Salomé L. (2020) DNA nanobiosensors for the monitoring of water quality Int J Hyg Environ Health 226:113485 doi: 10.1016/j.ijheh.2020.113485
  • Allemand J.-F., Tardin C. and Salomé L. (2019) Parallelized DNA tethered bead measurements to scrutinize DNA mechanical structure Methods  169, 46-56
  • Guilbaud S., Salomé L., Destainville N., Manghi M., Tardin C. (2019) Dependence of DNA persistence length on ionic strength and ion type. Phys. Rev. Lett. 122, 028102
  • Brunet A., Salomé L., Rousseau P., Destainville N., Manghi M. and Tardin C. (2018) How does temperature impact the conformation of single DNA molecules below melting temperature? Nucleic Acids Res. 46(4):2074-2081 doi: 10.1093/nar/gkx1285
  • Fournes F., Crozat E., Pages C., Tardin C., Salomé L., Cornet F. and Rousseau P. (2016) FtsK translocation permits discrimination between an endogenous and an imported Xer/dif recombination complex PNAS 113 (28), 7882–7887
  • Brunet A., Tardin C., Salomé L., Rousseau P., Destainville N. and Manghi M. (2015) Dependence of DNA persistence length on ionic strength of solutions with monovalent and divalent salts: a joint theory-experiment study. Macromolecules 48 (11), 3641–3652 doi: 10.1021/acs.macromol.5b00735
  • Brunet A, Chevalier S, Destainville N, Manghi M, Rousseau P, Salhi M, Salomé L, Tardin C. (2015) Probing a label-free local bend in DNA by single molecule tethered particle motion Nucleic Acids Res. 43(11):e72 doi: 10.1093/nar/gkv201