Gregoire PERRET


G.PERRET.jpg Host Laboratory FUJITA LAB.
Position in LIMMS PhD Student
Main Research Topic in LIMMS

Bio-MEMS - Silicon Nanotweezers for the characterization of DNA damage under therapeutic radiation beams 


Nanotweezers, DNA damage characterization, Radiotherapy

Contact LIMMS/CNRS-IIS (UMI 2820)
Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
Phone:+81 (0)3 5452 6036 / Fax:+81 (0)3 5452 6088
E-mail gperret at
Download icon_pdf.gifAbstract2015_GPerret.pdf


Short resume :
2012-now Actual position
2008-2012 Here
2004-2008 Here
2001-2003 Here

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Research Projects in Limms

1- Silicon Nanotweezers for the characterization of DNA damage under therapeutic radiation beams

Context :
Tumor cell killing in cancer radiotherapy is currently based on a rather empirical understanding of the basic mechanisms and effectiveness of DNA damage by radiation. It is well assessed that radiation induces single-strand and double-strand breaks in DNA, by various mechanisms [1], whose details and efficacy are, however, largely unknown.
Objectives & Methods :
Study the mechanics of DNA damage under ionizing beams for optimized tumor treatment. The Silicon Nano Tweezers (SNT) is a MEMS device for direct manipulation of biomolecules [2], an excellent candidate for in-beam operation thanks to its tiny size. The SNT, Fig.1.a, comprise two parallel arms ending with sharp tips, designed to trap molecules. SNT + DNA in inserted inside microfluidic cavity (Fig.1.b) and placed under radiotherapy machine (Cyberknife). The mechanical characteristic of the trapped molecules (stiffness, viscosity) under X-ray are measured in real time by monitoring the resonance frequency of the SNT handling the molecules, Fig.2.
Results :
Silicon Nanotweezers operation under therapeutic irradiation conditions, and direct detection of DNA damage inside DI water under X-ray beam was demonstrated for the first time.


Fig.1 a) SNT + DNA Bundle b) SNT Oscillator model c) Cyberknife


Fig.2 Mechanical characterization of DNA bundle damage during irradiation

References :
[1] R. E. Krisch, M. B. Flick, and C. N. Trumbore, Radiation Research, vol. 126, no. 2, pp. 251–259, 2013.
[2] G. Hashiguchi, T. Goda, M. Hosogi, K. Hirano, N. Kaji, Y. Baba, K. Kakushima, and H. Fujita, Anal. Chem., vol. 75, no. 17, pp. 4347–4350, 2003.

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Main publication List (papers, conferences and patent)






  1. F. Manca, S. Giordano, P.L. Palla, G. Perret, E. Lartigau, D. Collard, H. Fujita, F. Cleri, "Theoretical study of the basic mechanisms of DNA damage by therapeutic radiation beams", E-MRS Spring meeting 2014, Symposium N, May 26-29, Lille (France).
  2. G. Perret, T. Lacornerie, M. Kumemura, H. Guillou, L. Jalabert, E. Lartigau, T. Fujii, F. Cleri, H. Fujita, D. Collard, "Silicon nanotweezers inside liquid for the real time characterization of DNA degradation under radiotherapy treatment", E-MRS Spring meeting 2014, Symposium N, May 26-29, Lille (France).
  3. P-T. Chiang, M. Kumemura , H.Fujita, G. Perret, N. Lafitte, L.Jalabert, D. Collard, A. Enomoto, K. Miyagawa, Real-time Measurement of DNA Degradation under Radiation by Silicon Nanotweezers Coupled with Microfluidic Cavity, Technical Meeting on Sensors and Micromachines 2014.


2013 and prior

  1. G. Perret, T. Lacornerie, M. Kumemura, N. Lafitte, H. Guillou, L. Jalabert, E. Lartigau, T. Fuji, F. Cleri, H. Fujita, D. Collard, Real Time Biomechanical Characterization of DNA Damage under Therapeutic Radiation Beams, MRS Boston, Dec. 3rd 2013 (Oral).
  2. G.Perret, T.Lacornerie, M.Kumemura, N.Lafitte, H.Guillou, L.Jalabert, E.Lartigau, T.Fujii, F.Cleri, H. Fujita, D.Collard , Real time bio mechanical characterization of DNA damage under therapeutic radiation beams,  MicroTAS 2013, October 27-31, 2013, Freiburg, Germany. (poster)
  3. G. Perret, Silicon Nanotweezers with a Microfluidic Cavity for the Real Time Characterization of DNA Damage under Therapeutic Radiation Beams, EMBC'13, July 3-7, 2013, Osaka, Japan.(Oral)

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