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Jules A. Hoffmann

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Jules A. Hoffmann

Jules A. Hoffmann
Born (1941-08-02) 2 August 1941
Echternach, Luxembourg
Nationality French
Fields Biology
Institutions CNRS, University of Strasbourg
Alma mater University of Strasbourg
Notable awards Keio Medical Science Prize (2010)
Nobel Prize in Physiology or Medicine (2011)
Gairdner Foundation International Award (2011)

Jules A. Hoffmann (born 2 August 1941) is a Luxembourg-born French[1] biologist. During his youth, growing up in [2] He currently holds a faculty position at the University of Strasbourg.[3] He is a research director and member of the board of administrators of the National Center of Scientific Research (CNRS) in Strasbourg, France. He was elected to the positions of Vice-President (2005-2006) and President (2007-2008) of the French Academy of Sciences.[3] Hoffmann and Bruce Beutler were jointly awarded a half share of the 2011 Nobel Prize in Physiology or Medicine for "their discoveries concerning the activation of innate immunity,".[4]

Hoffmann and Lemaitre discovered the function of the fruit fly septic shock can be triggered by bacterial remains.[5][6][7]

Education

Hoffmann received undergraduate degrees in biology and chemistry at the University of Strasbourg, France. In 1969, he completed his Ph.D. in biology also at the University of Strasbourg under Pierre Joly in Laboratory of General Biology at the Institute of Zoology.[2] His post-doctoral training was at the Institut für Physiologische Chemie at Philipps-Universität in Marburg an der Lahn, Germany, in 1973–1974.

Studies and Research Careers

During his Ph.D. program under Pierre Joly, Hoffmann started his research in studying antimicrobial defenses in grasshoppers, inspired by the previous works done in the laboratory of Pierre Joly showing that no opportunistic infections were apparent in insects after the transplantation of certain organs from one to another.[2] Hoffmann confirmed discovery of phagocytosis done by Eli Metchnikoff, through injection of Bacillus thuringiensis and observation of increase of phagocytes.[2] In addition, he showed strong correlation between hematopoiesis and antimicrobial defenses by assessing the susceptibility of an insect to the microbial infection after X-ray treatment.[2] Hoffmann shifts from using grasshopper model to using dipteran species in the 80s. By using Phormia terranovae, Hoffmann and his colleagues were able to identify 82-residues long antimicrobial polypeptide named Diptericin which was glycine-rich, along with other polypeptides in Drosophila melanogaster such as defensin, cecropin, and attacin.[2] Further molecular genetic analysis revealed that the promoters for the genes encoding these antimicrobial peptides contained DNA sequences similar to the binding elements for NF-κB in mammalian DNA. Dorsal gene, critical in dorso-ventral patterning in the early embryo of Drosophila melanogaster was also identified to be in this NF-κB family. It was initially speculated by Hoffmann and colleagues that activity of Dorsal was directly linked to the expression of the Diptericin gene. However, it turned out that Diptericin was normally induced even in the loss-of-function Dorsal mutants. Further conducted research showed that Diptericin expression was dependent on the expression of imd gene. Identification of another antifungal peptide named Drosomycin and RNA blots demonstrated that two distinct pathways(Toll, Imd) exist, involving Drosomycin and Diptericin respectively. Similarities of structure and function between several members in the Drosophila embryo and members in mammals being noted, study "The Dorsoventral Regulatory Gene Cassette spảtzle/Toll/cactus Controls the Potent Antifungal Response in Drosophila Adults"[8] by Lemaitre and Hoffmann in 1996 illuminated the possible existing innate immunity in Drosophila in response to fungal challenge. Later works identified that Toll transmembrane receptors are present in a wide variety of phyla and are conserved through evolution along with conservation of NF-κB activating cascades.[2]

Hoffmann was a research assistant at CNRS from 1964 to 1968, and became a research associate in 1969. Since 1974 he has been a Research Director of CNRS. Between 1978 and 2005 he was Director of the CNRS research unit "Immune Response and Development in Insects", and from 1994 to 2005 he was director of the Institute of Molecular and Cellular Biology of CNRS in Strasbourg.

Hoffmann is a member of the United States National Academy of Sciences, the American Academy of Arts and Sciences, the Fondation Écologie d'Avenir[9] and the Russian Academy of Sciences.

Controversy

Bruno Lemaitre, a research associate in the Hoffmann laboratory at the time when the major work on Drosophila innate immunity was conducted (for which Hoffmann was awarded the Nobel), claims he did all the work alone. Lemaitre now supervises his own laboratory at the École Polytechnique Fédérale de Lausanne in Switzerland.[10][11]

Awards

Hoffmann, Göran K. Hansson (chairman of the Nobel Committee for Physiology or Medicine) and Bruce Beutler
Hoffmann and Bruce Beutler

References

  1. ^ "CNRS senior researcher Jules Hoffmann awarded the 2011 Nobel Prize in Physiology or Medicine".  
  2. ^ a b c d e f g "Jules A. Hoffmann – Nobel Lecture: The Host Defense of Insects: A Paradigm for Innate Immunity". Nobelprize.org. 28 November 2013. Retrieved 29 November 2013. 
  3. ^ a b "Jules A. HOFFMANN". UPR9022-IBMC:Immune Response and Development in Insects. Retrieved 29 November 2013. 
  4. ^ a b "Nobel Prize in Physiology or Medicine 2011" (Press release).  
  5. ^ Callaway E (2011). "Nobel announcement marred by winner's death". Nature 478 (7367): 13–4.  
  6. ^ Song, W.Y. et al. (1995). "A receptor kinase-like protein encoded by the rice disease resistance gene, XA21". Science 270 (5243): 1804–1806.  
  7. ^ Gomez-Gomez, L. et al. (2000). "FLS2: an LRR receptor-like kinase involved in the perception of the bacterial elicitor flagellin in Arabidopsis". Molecular Cell 5 (6): 1003–1011.  
  8. ^ Lemaitre, B.; Nicolas, E.; Michaut, L.; Reichhart, J. M.; Hoffmann, J. A. (1996). "The dorsoventral regulatory gene cassette spätzle/Toll/cactus controls the potent antifungal response in Drosophila adults". Cell 86 (6): 973–983.  
  9. ^ http://fondationecologiedavenir.org/Conseil_Orientation.htm
  10. ^ Travis, John (2011-12-16) Nobel Prize for Immunologists Provokes Yet Another Debate. sciencemag.org
  11. ^ http://lemaitrelab.epfl.ch/

External links

  • Jules Hoffmann at the French Academy of Sciences
  • Jules Hoffmann at the Balzan Foundation
  • HOW WE SENSE MICROBES: GENETIC DISSECTION OF INNATE IMMUNITY IN INSECTS AND MAMMALS
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