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Département Biologie des Génomes

par Clubs génome, EQYY - publié le , mis à jour le


  • Lundi 2 septembre 11:00-12:00 - Chloé GIRARD - Stanford University, USA

    Recombining genomes : when, where and how much ?

    Résumé : Meiotic recombination is a major driving force of evolution : not only can it create new and advantageous genetic combinations, but it can also break down existing ones. The frequency and distribution of crossovers dictate which traits are inherited together and which ones are re-assorted to produce new combinations on which selection can act. Crossover distribution is neither uniform nor random, but the mechanisms and evolutionary forces that impose crossover patterning are poorly understood. Understanding when, where, and how much genomes recombine is of major importance to apprehend causes of infertility and to reveal the forces contributing to genome evolution. Chloe Girard has been studying the mechanisms that regulate meiotic recombination in both the plant Arabidopsis and the nematode C. elegans, and will share insights about factors that limit crossover formation in wild type. She will also present future directions for her research about how crossover distribution and frequency can be influenced by polymorphism density and external stress conditions.

    Lieu : Salle A. Kalogeropoulos - bâtiment 400 - campus d'Orsay

  • Mardi 10 septembre 11:00-12:00 - Céline VALLOT - Institut Curie, Paris

    Séminaire Céline VALLOT

    Lieu : Salle des séminaires - bâtiment 26 - campus de Gif-sur-Yvette

  • Vendredi 20 septembre 11:00-12:00 - Christian MUCHARDT - Institut Pasteur, Paris

    Séminaire Christian MUCHARDT

    Lieu : Salle des séminaires - bâtiment 26 - campus de Gif-sur-Yvette

  • Vendredi 27 septembre 11:00-12:00 - Frederic FROTTIN - Max Planck Institute of Biochemistry, D-82152 Martinsried, Germany

    Phasing-in protein quality control in the nucleus : the nucleolus is a phase-separated protein quality control compartment with novel chaperone-like properties.

    Résumé : Protein quality control in the nucleus is not well understood. The nucleus contains several non-membrane bound subcompartments forming liquid-like condensates. The largest of these is the nucleolus, the site of ribosome biogenesis. Metastable nuclear proteins that misfold upon heat stress enter the nucleolus where they avoid irreversible aggregation and remain competent for Hsp70 dependent refolding upon recovery from stress. Prolonged stress or the uptake of proteins associated with neurodegenerative diseases resulted in loss of reversibility. These findings demonstrate how the properties of a phase-separated compartment can be utilized in protein quality control, a fundamental biological function.
    Recent publications :
    The nucleolus functions as a phase-separated protein quality control compartment.
    Frottin F, Schueder F, Tiwary S, Gupta R, Körner R, Schlichthaerle T, Cox J, Jungmann R, Hartl FU, Hipp MS.
    Science. 2019 Jul 11. pii : eaaw9157. doi : 10.1126/science.aaw9157. [Epub ahead of print]
    In Situ Structure of Neuronal C9orf72 Poly-GA Aggregates Reveals Proteasome Recruitment.
    Guo Q, Lehmer C, Martínez-Sánchez A, Rudack T, Beck F, Hartmann H, Pérez-Berlanga M, Frottin F, Hipp MS, Hartl FU, Edbauer D, Baumeister W, Fernández-Busnadiego R.
    Cell. 2018 Feb 8 ;172(4):696-705.e12. doi : 10.1016/j.cell.2017.12.030. Epub 2018 Feb 1.
    Soluble Oligomers of PolyQ-Expanded Huntingtin Target a Multiplicity of Key Cellular Factors.
    Kim YE, Hosp F, Frottin F, Ge H, Mann M, Hayer-Hartl M, Hartl FU.
    Mol Cell. 2016 Sep 15 ;63(6):951-64. doi : 10.1016/j.molcel.2016.07.022. Epub 2016 Aug 25.

    Lieu : Bibliothèque - bâtiment 34 - campus de Gif-sur-Yvette

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