Welcome to the Topologically Active Polymers (TAP) Lab!

taplogo erc

Group mission:

In spite of their extreme length and confinement, our genomes are surprisingly well organised, functional and knot-free. This is achieved via sophisticated proteins that exert exquisite topological and mechanical control over the genome's material properties.
Inspired by this, we aim to discover new DNA-based topological soft materials and complex fluids that can change properties in time.
The group's expertise is rooted in polymer and statistical physics, and employ both simulations and experiments to answer our questions.
We believe boundaries between disciplines were made to be broken, and we do our best to shatter them every day.

News:

10/2022 Very cool paper by Andrea Bonato, who shows that reconnecting ring polymers under confinement can undergo "topological gelation", forming knots and links. Read more in PNAS.
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08/2022 Here we show that ParB from Bacillus subtilis can recruit other ParBs and load them onto DNA away from parS! Using simulations we show that this cooperative recruitment can lead to spreading along DNA. Experiments done by Milos Tisma and simulations from the TAPLab. Read more in Science Advances.
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Movie showing the high force regime

08/2022 In this paper we show that digestion of dense solutions of DNA yields interesting rheological signatures, and that they depend on the topology of the DNA! Read more in Nature Communications.
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07/2022 New paper! We asked if there exist some local geometric properties of 3D curves that capture their "knottedness". Indeed there are! Patterns of local density and writhe can idetify the loction of knots along curves around 90% of the times! Read more here in ACS Polymers Au.
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07/2022 A 12 minutes recorded talk from the APS March meeting on how IHF proteins can fluidify entangled solutions of DNA.

06/2022 New paper from the Lab! This time a perspective on the Viscoelasticity of Proteins and Nucleic Acids Condensates, written with Mattia Marenda!
Take home message: condensates are "by default" not liquid but viscoelastic. We review how to best measure their viscoelasticty and what could be the physiological implications of non-Newtonian rheology. Now published in JACS Au.
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05/2022 Really enjoyed Pint of Science 2022. I think I benefitted more than the audience - inspiring questions and fresh ideas! I loved it! You can see the video here, apologies that it was taken from a very tight angle!

04/2022 Physics of Life Summer School under way!
120 people, 5 days, 2 poster sessions, 2 Q&A sessions, excellent speakers and science, lots of ideas and infinite energy!
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04/2022 Fresh publication in NAR. What's the most efficient way to keep things unknotted? Jump around!! Credits to Yair A. G. Fosado for most of the simulations! See GitHub for open source codes.
Dynamic and Facilitated Binding of Topoisomerase Accelerates Topological Relaxation
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12/2021 New paper in collaboration with Dekker's lab Condensin extrudes DNA loops in steps up to hundreds of base pairs that are generated by ATP binding events. Simulations again by Andrea, the Cook, Bonato.
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12/2021 Loop Extrusion goes 3D! Read more at Biophys J.. Simulations by Andrea, the Cook, Bonato.
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11/2021 TAPLab having a lasagne-off competition! The conclusion of the party was that if we don't have a future in science we can set up a rather decent osteria and sell food! group group group

10/2021 Entropic Competition - who's going to win? Read more at PRR Simplifying topological entanglements by entropic competition of slip-links. Simulations again by Andrea, the Cook, Bonato.
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10/2021 Ah! Our friend the Kinetoplast DNA imaged with a spinning disk confocal - thanks to the magic hands of Mattia Marenda at IGMM and ESRIC
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10/2021 New paper on epigenetic memory and "recolourable" polymers in Nature Communications. Polycomb condensates can promote epigenetic marks but are not required for sustained chromatin compaction All credits to Jorine Eeftens while in Brangwynne lab. Using optogenetics she showed that PRC condensates can compact chromatin but that they are are not needed to maintain the compact state. A very interesting link between thermodynamics and epigenetic memory!
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08/2021 New preprint! By mixing entangled solutions of DNA with restriction enzymes we discover that we can obtain both thinning and thickening! Find out more at
Universal and Programmable Rheology of Topologically-Active DNA Fluids
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05/2021 Finally out - Topological tuning of DNA mobility in entangled solutions of supercoiled plasmids in Science Advances!
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05/2021 Maria and Yair join the lab! Maria will be the expert on living polymer simulations while Yair will model DNA hydrogels and origami in their finest details!
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05/2021 Giorgia looks so well after her DNA hydrogels that they sometimes show their affection back .. dnahh

04/2021 Jenny joins the lab, she will be working on rheology of DNA origami!
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04/2021 An exceptionally talented MPhys student Liam Bradbury (Link to fb) made this beutiful public summary on his MPhys project, a must watch and so catchy!

03/2021 What can soft matter do for biology (and viceversa)?
Mattia Marenda (IGMM) and Davide try to convince molecular biologist that soft matter is cool!

03/2021 Fun (or embarassingly unprepared) Higgs chat w Davide.
The associated Higgs talk was far better prepared (but ran long) on topological glasses, magnetic polymer models for chromatin and Progressive DBSCAN clustering (= a random bunch!).

03/2021 Talk on HIV integration, topological regulation of the genome and TAPs at GEOTOP-A

03/2021 Giorgia joins the lab, a chemist by training, she will be working on DNA hydrogels!
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02/2021 New paper from Yair and Davide Non Equilibrium Supercoiling and Action at a Distance now out in PNAS!

02/2021 Davide receives the Early Career Award in Statistical Mechanics and Thermodynamics from Royal Society of Chemistry!

02/2021 New paper from the group! Andrea Bonato and Davide collaborate with Cees Dekker lab to explain phase separation of yeast cohesin in vitro. See Bridging-induced phase separation induced by cohesin SMC protein complexes in Science Advances!

01/2021 Cleis, Ed and Simon join the lab! Cleis will be working on models of genome organisation, HIV integration and transposable elements, Ed on material properties of genomes, kinetoplast and the sorts while Simon will bring in some proper experimental (micro)rheology expertise.
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11/2020 Davide receives the Chancellor's Rising Star Award from the Univeristy of Edinburgh!

10/2020 Non-Equilibrium Living Polymers. A fun exercise in scaling calculations! Open access in Entropy (invited by A Maritan and A Giometto) Link erc

09/2020 Finally I can say it (embargo lifted): ERC StG grant awarded! Hurray! Link See Team&Vacancies for openings in the lab erc

08/2020 Another grant awarded (can't say which yet)! Keep an eye out for more available positions in the lab!

06/2020 I am very honoured to have been awarded a Royal Society University Research Fellowship! This adventure including experiments on DNA topology and microrheology will start in Jan 2021. A PhD position will be soon advertised (drop me a line if interested!). rs

05/2020 Very happy to have been nominated "Outstanding Reviewer" by RSC Soft Matter!! href="https://pubs.rsc.org/en/content/articlelanding/2020/sm/d0sm90069a#!divAbstract">Link

05/2020 Threading induced dynamical transition in Chimeric Polymers out in ACS MacroLetters. Great collaboration with Angelo Rosa, Jan Smrek and Matthew Turner also part of the EUTOPIA COST action.
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04/2020 Beautiful representation of the action of SMC and Topoisomerase on knotted strings! Courtesy of Elias Melas
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see also PNAS article.

03/2020 In May I will start a Leverhulme Early Career Fellowship at UoE on "Topologically Active Polymers" (TAPs)! I will do (try) theory and experiments so need lots of help. Drop me an email if interested to work on this!

02/2020 Great collaboration with Alex Bousios and Hans-Wilhelm Nuetzmann on the interplay between Transposable Elements and 3D genome organisation now out on Mobile DNA

05/12/2019 Welcome Gaia!

09/2019 Non Equilibrium Theory of Epigenomic Microphase Separation in the Cell Nucleus
out in PRL and companion PRE gif

08/2019 Looking forward to Physics Meets Biology 2019 in Oxford in September! Link

08/2019    Very proud to have been awarded a Leverhulme Early Career Fellowship which will start in May 2020 at the University of Edinburgh

08/2019    Excited to start my new position as Research Fellow in the Dept. of Mathematical Sciences in Bath!

05/2019    Meeting on 4D genome organisation in Venice (3-5 October 2019): More informations and details HERE and yes, the venue of the conference is the one in the picture! :)
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05/2019    Very productive meeting with Hans Neutzmann and Alex Bousios on the topology and topography of transposable elements! Many thanks to the Physics of Life Network for funding!

04/2019    New review on the role of RNA on chromatin organisation

04/2019    Interdisciplinary Challenges in Non-Equilibrium Physics going at full steam!

03/2019    "Synergistic Topological Simplification of the Genome" now in PNAS

01/2019    "Physical Principles of Retroviral Integration" now in Nature Communications

11/2018    With the support of the Higgs Centre, the Physics of Life and the Emergence and Physics Far From Equilibrium Networks George Constable (Bath), Gianmaria Falasco (Luxembourg), Elsen Tjhung (Cambridge) and I will be hosting an "Interdisciplinary Challenges in Non-Equilibrium Physics" Workshop in Edinburgh (10-13 April 2019, LINK).

05/2018    Congratulations to Luca Tubiana and Raffaello Potestio for organising and winning a COST action on Topology. EUTOPIA will connect people working on a range of topics, from liquid crystals to chromatin! A great chance for new collaborations and projects!!

01/2018    The first workshop on the Physics of Epigenetic and Chromatin Dynamics will be held in Edinburgh 16-17 April 2018. The registration is free but only a limited number of places are available. For poster abstract submission please email davide.michieletto@ed.ac.uk.

01/2018    Our recent paper on Epigenetic Memory and Genomic Bookmarking has been published in Nucleic Acids Research!

11/2017    Paper in collaboration with Angelo Rosa on the glassy dynamics of ring polymers under random pinning has been published in PRL

09/2017    Congratulations to Chris for his paper on Non-Equilibrium Chromosome Looping. An alternative view to loop extrusion "without a motor"! Made the cover of the Sept. issue of PRL!!

20/05/2017    Welcome Dante!

12/2016    Our paper on a Recolourable Polymer model to describe chromatin folding with an underlying dynamic epigenome has been published in PRX, followed up by an APS Focus story on How Cells Remember Who They Are signed by science writer Philip Ball

12/2016    My paper on the Tree-Like Structure of Rings has been published in Soft Matter!

05/2016    Last paper of my PhD: A Topologically-Driven Glass in Ring Polymers has been published in PNAS with a News&Views in Nature Physics!

10/2015    Paper on the Topological Patterns of DNA Knots accepted in PNAS!!

09/2015    Very honored to receive the IOP Ian Macmillan Ward Prize for best PhD student publication in Polymer Physics

05/2015    My model for the Kinetoplast DNA a genomic "medieval chainmail" has been published in Physical Biology

12/2014    A Taste for Anelloni has been featured in the IOP magazine Physics World followed up by a new entry in the Wiktionary!