We had the pleasure of Hiroshi Kimura, Yuko Sato (both Tokyo Tech), and Chikashi Obuse (Osaka University) visiting our group. We were treated to a great presentation by Hiroshi, discussions with all visitors, and by a lucky accident the “big dinner” conincided with Lennart’s birthday. To explain what you see in the picture…
2017.08.17 – Pavel and Edlyn took part in DRESDEN-concept’s Wissenschaftsfahrt (Science Cruise). They joined other fellow researchers (from MPI-CBG and around Dresden) to celebrate Dresden as an outstanding city for science and culture.
DRESDEN-concept (Dresden Research and Education Synergies for the Development of Excellence and Novelty) is a research alliance that aims to “realize synergies in research, teaching, infrastructure and administration”. MPI-CBG is among the many partners of this network. For more information, visit: www.dresden-concept.de/en/home.html
The evening was filled with mingling with scientists, a speech from Dr. Eva-Maria Stange (the Saxon State Minister of Science and Fine Arts), enjoying music from a live band, and taking in the beautiful landscapes along the Elbe River.
Microscopes are optimized to give the clearest images, taking great care of all optical components along the light path. This has lead to a situation where the transition between a live sample and the surrounding liquid becomes the biggest imperfection in the optical path.
In this MPI-CBG/MPI-PKS/CSBD collaboration, lead by Tobias Boothe from the Rink lab, we show a simple but highly effective procedure to minimize the optical imperfection at the sample/medium interface. The technique is based on OptiPrep (chemical name: iodixanol), which can be ordered and used in any biological laboratory without any unusual equipment. Our technique worked with no toxicity or other problems in whole animals, primary cells, cell lines, as well as organoids.
Find our paper online with eLife.
Congrats Edlyn for being awarded a postdoctoral fellowship from the Fonds de recherche du Québec (Santé), the scientific grant agency for the government of Quebec.
July 3rd – 7th, 2017: Máté attended the 10th European Zebrafish Meeting in his hometown, Budapest, and gave a talk in the Genomics/Epigenetics session. The conference brought together the ever-growing zebrafish community (over 500 participants) and covered a wide range of topics. Those who missed it will have to wait until 2020, when the next EZM takes place in Prague.
Edlyn attended the 7th Annual MPI-CBG Postdoc Retreat, which took place in the beautiful and picturesque Tisá, Czech Republic, from 19th to 21st of June, 2017.
The three-day retreat included talks (and elevator pitches) from fellow postdocs at the institute & invited external speakers:
- Dr. Simon Reber (Humboldt-Universität, Berlin),
- Dr. Elvan Boke (Centre for Genomic Regulation, Barcelona),
- Dr. Selina Wray (University College London),
- Dr. Adrian Raga (Katholieke Universiteit Leuven),
- Dr. Olof Idevall-Hagren (Uppsala University);
and talks from our very own: Dr. Jacqueline Tabler and Dr. Christoph Zechner.
The retreat was scientifically enriching and also featured a hiking trip in Bohemian Switzerland, through the sandstone rocks of the Tisá Walls.
Last month Pavel, Lennart, and Máté shared their enthusiasm for science as part of the “Junior Doktor” and “Seniorenakademie” series at our institute.
Pavel taught highly motivated pupils from primary school about the evolution of the eye. This was followed up by a microscopy session where the ‘scientists of the future’ got to look at zebrafish pineal glands and stained nuclei of zebrafish embryos.
Máté gave a seminar about transcription factors to an excited elder audience. He talked about general concepts of how transcription factors can orchestrate gene expression programs with some examples from his own research in zebrafish.
At the beginning of May we had the pleasure of welcoming Amy Dowdle from the lab of Julia Horsfield, University of Otago, New Zealand. It was an exciting one week visit as part of a working collaboration between our two labs. The week involved developmentally staging zebrafish embryos to testing morpholinos on the timing of genome activation. We look forward to many more exchanges of knowledge and skills in the future!
From 23rd to 26th April, the MPI-CBG hosted the first international meeting exclusively dedicated to the Maternal-Zygotic Transition (MZT). Under the title "Awakening of the genome: The maternal-to-zygotic transition", a jam-packed meeting program was presented under the umbrella of the EMBO event series.
Focusing on genome activation allowed a first-ever platform for the MZT community. Participants from all over the world gathered to showcase an extensive range of techniques, approaches, and biological questions. Plenty of new and unpublished data made it exciting, a meeting size of ~150 participants meant that everyone could be easily approached, and the wish for a repeat meeting was voiced several times.
Our study demonstrating how repressors (histones) and activators (transcription factors) jointly control transcription in the zebrafish embryo is now available online: Competition between histone and transcription factor binding regulates the onset of transcription in zebrafish embryos. Joseph et al. eLife (2016)
In this study, lead by Shai Joseph (Vastenhouw Lab) and carried out collaboratively with the Shevchenko and Zaburdaev lab, we could quantitatively address a long-standing question: how is the timing at which transcription starts in embryos controlled?
By a combination of quantitative, molecular, and functional techniques, we found that the two most prominent hypotheses, the "depleted repressor" and the "increasing activator" models, can be unified in a competition model. Here, repressing histones and activating transcription factors go head-to-head competing for access to DNA target sites.
Additionally, the nuclear-to-cytoplasmic ratio - often defined in the number of genomes in an embryo - resurfaced as a key concept, though in the form of a volume ratio between cell nuclei and overall cytoplasm. While the global concentration of not DNA-bound histones did not change at the time of transcription onset, we detected a marked decrease in the concentration of not DNA-bound histones specifically within cell nuclei.