Helge Grosshans
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Jun 7, 2022 How animals reach their correct size |
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Apr 13, 2021 When two worlds meet: a protease that controls small RNA activity |
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Jul 21, 2020 A developmental clock with a checkpoint function |
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Apr 5, 2020 The circuitous path to adulthood |
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Aug 5, 2019 Unlocking the secrets of an important regulator of human development |
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Helge Grosshans
Biological clocks and timers in development
The development of an animal requires proper temporal synchronization of diverse events, facilitated by developmental clocks. How such clocks function is only beginning to emerge. What are their properties? What are the components that make them run, and how are they wired? To solve these questions, we investigate developmental timing in the roundworm C. elegans, where we can exploit our recent discovery that thousands of genes oscillate in expression during larval development. Such extensive and robust molecular clock output, combined with powerful tools for genetic manipulation and screening, makes C. elegans uniquely suited for dissecting the underlying clock mechanism. We combine high-throughput single animal-based methods including quantitative time-lapse imaging with genomics, genetic and computational approaches to record and alter oscillations and developmental timing. Thus, we aim to establish a mechanistic and quantitative model of the clock.
Although oscillator-based developmental clocks are crucial to control execution of repetitive events such as the formation of vertebrae in mammals, distinct mechanisms time linear progression. For instance, transition from juvenile (larval) to adult fates in C. elegans relies on a regulatory cascade, where an RNA-binding protein, LIN28, represses a miRNA, let-7, which in turn represses another RNA-binding protein, LIN41/TRIM71. The functions of these factors appear conserved in mammals where they regulate stem cell fates and, possibly, the onset of puberty. Working with C. elegans and mammalian cells, we aim to obtain a full mechanistic understanding of this pathway and its components to understand how control of 'linear time' is achieved and integrated with clock-controlled processes.
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Helge Grosshans
This is a list of selected publications from this group. For a full list of publications, please visit our Publications page and search by group name.
Gudipati, R.K., Braun, K., Gypas, F., Hess, D., Schreier, J.,Carl, S.H., Ketting, R.F., and Grosshans, H. (2021) Protease-mediated processing of Argonaute proteins controls small RNA association.
Molecular Cell, Volume 81, Issue 11, Pages 2388-2402.e8Tsiairis, C., and Grosshans, H. (2021) Gene expression oscillations in C. elegans underlie a new developmental clock.
Current Topics in Developmental Biology, Volume 144, 2021, Pages 19-43Meeuse, M.W.M.*, Hauser, Y.P.*, Morales Moreno, L.J., Hendriks, G.-J., Eglinger, J., Bogaarts, G., Tsiairis, C., Grosshans, H. (2020) Developmental function and state transitions of a gene expression oscillator in C. elegans
Mol Syst Biol. 16: e9498(* equal contribution)
Azzi, C.*, Aeschimann, F.*, Neagu, A., and Grosshans, H. (2020) A branched heterochronic pathway directs juvenile-to-adult transition through two LIN-29 isoforms
eLIFE 9: e53387(* equal contribution)
Welte, T.*, Tuck, A.C.*, Papasaikas, P., Carl, S.H., Flemr, M., Knuckles, P., Rankova, A., Bühler, M., and Grosshans, H. (2019) The RNA hairpin binder TRIM71 modulates alternative splicing by repressing MBNL1
Genes Dev. 33:1221-1235(* equal contribution)
Aeschimann, F., Neagu, A., Rausch, M., and Grosshans, H. (2019) A single let-7 target to coordinate transition to adulthood
Life Science Alliance 2, e201900335Brancati, G., and Grosshans, H. (2018) An interplay of miRNA abundance and target site architecture determines miRNA activity and specificity
Nucleic Acids Res. 46: 3259-3269Miki TS, Carl SH, Grosshans H (2017) Two distinct transcription termination modes dictated by promoters
Genes Dev. 31: 1870-1879.Aeschimann F, Kumari P, Bartake H, Gaidatzis D, Xu L, Ciosk R, Grosshans H (2017) LIN41 post-transcriptionally silences mRNAs by two distinct and position-dependent mechanisms
Mol Cell 65:476-489.de la Mata M, Gaidatzis D, Vitanescu M, Stadler MB, Wentzel C, Scheiffele P, Filipowicz W, Grosshans H (2015) Potent degradation of neuronal miRNAs induced by highly complementary targets
EMBO Rep 16:500-11Ecsedi M, Rausch M Grosshans H (2015) The let-7 microRNA directs vulval development through a single target
Dev Cell 32:335-44Hendriks GJ, Gaidatzis D, Aeschimann F, Grosshans H (2014) Extensive oscillatory gene expression during C. elegans larval development
Mol Cell 53:380-92.Chatterjee S, Fasler M, Büssing I, Grosshans H (2011) Target-mediated protection of endogenous microRNAs in C. elegans
Dev Cell 20:388-396Chatterjee S, Grosshans H (2009) Active turnover modulates mature microRNA activity in C. elegans
Nature 461:546-549Ding XC, Grosshans H (2009) Repression of C. elegans microRNA targets at the initiation level of translation requires GW182 proteins
EMBO J 28:213-222Full list of publications
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Abhi is from central India where he studied Biotechnology Engineering. His first research project was to investigate multicellularity in social amoebae. He went on to receive a full scholarship for a research-based masters in Marine Biology in Hong Kong, performing experiments on larvae and shell proteins of an intertidal oyster. His stint in South Africa concerned evolvability at the origin of cellular life. For his theoretical PhD in Systems Biology, he moved to Germany where he mathematically modelled the molecular switches and rhythms in the circadian clock of a filamentous fungi.
Current reseachAbhi is combining experimental and theoretical approaches to elucidate the regulatory network underlying a developmental clock of C. elegans.
EducationPhD in Theoretical Chronobiology, Humboldt University of Berlin (in collaboration with Heidelberg University)
Predoc in Evolutionary Biology, Wits University
MPhil in Marine Biology, University of Hong Kong
Premaster in Developmental Biology, Indian Institute of Science
BEng in Biotechnology Engineering
Technical/Research associates
In current position since 2015
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Alex trained as an engineer specialised in Applied Statistics in Rennes. He obtained a CEA PhD scholarship to work on integrating metabolic and genomic information in prokaryotes. He then worked as a biostatistician for the Sleep/Wake Research Center, before being recruited to bring mouse transcriptomics to the Malaghan Institute of Medical Research. At UNIL, Alex identified lincRNAs involved in the cell cycle. Alex then analysed lipidomics data at the Baker Institute, before becoming a Research Associate at the FMI.
Alex loves to tinker in R and gnaw at datasets until he can get everything out of them, and enjoys helping people out with their experimental designs and statistical analyses.
Alex is helping set up and dig into the many *omics projects of the Grosshans lab, aiming to investigate the molecular clocks driving C. elegans gene expression.
EducationPhD in bioinformatics, Genoscope / Universite Evry Val d'Essonne
Engineering degree, agronomy, specialization in applied statistics,
Agrocampus Rennes
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