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Anita Meier

@anitafmeier.bsky.social
121 followers 173 following 57 posts

Virologist at ETHZ sharing my fascination for viruses

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Anita Meier @anitafmeier.bsky.social · 14/09/2026
Also, DNA blebbing is independent of virus transport to the nucleus! Membrane fusion seems to be sufficient and blebbing is possibly actin-activated 🤯 Paper link: www.pnas.org/doi/10.1073/...
pnas.org
Expulsion of nuclear DNA to the cytoplasm after viral entry: A mechanism for activation of the cGAS pathway | PNAS
Cells respond to viral infection by induction of numerous innate and other host responses to block infection in that cell and surrounding cells. Th...
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Anita Meier @anitafmeier.bsky.social · 14/09/2026
For years I've been wondering why I see DNA blobs in the cytosol of HSV-1 infected cells! A new study shows that HSV-1 infections trigger the shedding of nuclear DNA into the cytoplasm possibly through cellular mechanosensing. This blebbing might activate IFN signaling through cGAS.
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Anita Meier @anitafmeier.bsky.social · 04/07/2026
Thank you!! 😊
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Benjamin Ambrose @single-mole.bsky.social · 01/07/2026
KymoSketch started out as a GUI for our kymotracker script, but after I added DeepDiffusion to it I got suggestions to add more features and it’s since become a more fleshed out analysis platform (1/6)
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Anita Meier @anitafmeier.bsky.social · 03/07/2026
Thank you!
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Anita Meier @anitafmeier.bsky.social · 03/07/2026
Thank you so much!
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Anita Meier @anitafmeier.bsky.social · 03/07/2026
Finally, we show that UL9 mediates intermolecular DNA tethering/ bridging.
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Anita Meier @anitafmeier.bsky.social · 03/07/2026
We also show that UL9-induced loops form rapidly and don't migrate or change size. This indicates tethering of two sites rather than loop extrusion.
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Anita Meier @anitafmeier.bsky.social · 03/07/2026
Kymographs of labelled UL9 clearly demonstrate stable binding to non-origin sequences.
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Anita Meier @anitafmeier.bsky.social · 03/07/2026
However, using force spectroscopy we found that UL9 very efficiently (~55%) introduces large (~300bp) loops in larger DNA templates independent of the origin sequence. ATP binding but not hydrolysis destabilises those loops.
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Anita Meier @anitafmeier.bsky.social · 03/07/2026
Previous papers suggested that UL9 bends the ~70bp origin sequence to mediate strand separation. Using smFRET we indeed found some cases of origin bending but it was very rare (~3%).
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Anita Meier @anitafmeier.bsky.social · 03/07/2026
Our latest paper is out! 🎉 We show that the HSV-1 origin binding protein UL9 tethers dsDNA thereby forming intramolecular DNA loops and intermolecular DNA tethers. 🤝 www.nature.com/articles/s41...
nature.com
HSV-1 origin binding protein UL9 forms intermolecular DNA tethers and intramolecular DNA loops - Nature Communications
The mechanism of herpes simplex virus type 1 (HSV-1) genome replication remains not fully understood. Here, the authors find that the HSV-1 origin binding protein UL9 does not mediate DNA looping but ...
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Anita Meier @anitafmeier.bsky.social · 16/06/2026
Interesting question! As far as I understand, VP4 can bind to host cell receptors before cleavage. However, entry depends on trypsin cleavage. Maturation and egress are trypsin independent.
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Anita Meier @anitafmeier.bsky.social · 16/06/2026
I hope you enjoy seeing the beautiful structures: uncleaved (left) and trypsin-treated (right) RV spike Image credit and really nicely written paper: Structural determinants of rotavirus proteolytic activation | PLOS Pathogens journals.plos.org/plospathogen...
journals.plos.org
Structural determinants of rotavirus proteolytic activation
Author summary Rotavirus is the leading cause of severe childhood diarrhea worldwide, resulting in significant morbidity and mortality each year. To cause an infection, rotavirus must first activate i...
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Anita Meier @anitafmeier.bsky.social · 16/06/2026
Rotavirus (RV) is the leading cause of severe childhood diarrhea. To enter the host cell, RV must first activate its spike protein. This occurs when trypsin, a digestive enzyme found in the intestine, cleaves specific regions of the spike protein. Hence, ensuring tissue specificity.
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Anita Meier @anitafmeier.bsky.social · 20/04/2026
More on genome packaging-induced high static repulsion between DNA, hydration and bending forces: pubs.acs.org/doi/10.1021/...
pubs.acs.org
Herpes Virus Genome, The Pressure Is On
Herpes simplex virus type 1 (HSV-1) packages its micrometers-long double-stranded DNA genome into a nanometer-scale protein shell, termed the capsid. Upon confinement within the capsid, neighboring DN...
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Anita Meier @anitafmeier.bsky.social · 20/04/2026
Structure paper: Cryo-EM structures of herpes simplex virus type 1 portal vertex and packaged genome | Nature share.google/zobIY3gU3MGh...
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Cryo-EM structures of herpes simplex virus type 1 portal vertex and packaged genome - Nature
Cryo-electron microscopy structures of the herpesvirus capsid including the viral genome reveal ordered DNA structures and structural features of the capsid that suggest possible mechanisms for viral genome encapsidation.
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Anita Meier @anitafmeier.bsky.social · 20/04/2026
Herpes simplex virus type 1 (HSV-1) tightly packages its DNA within the capsid and creates a pressure of ~20 atm that is used to inject the genome into the cell nucleus. Check out this beautiful structure of the capsid and portal vertex:
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Anita Meier @anitafmeier.bsky.social · 10/03/2026
www.cell.com/trends/genet...
cell.com
Bacteriophage origins of mitochondrial replication and transcription proteins
Mounting evidence suggests that key components of the mitochondrial transcription and replication apparatus are derived from the T-odd lineage of bacteriophage rather than from an α-Proteobacterium, a...
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Anita Meier @anitafmeier.bsky.social · 10/03/2026
We partially originate from viruses! This week I found out that part of the mitochondrial replication machinery (polymerase and helicase-primase) has its ancestry in bacteriophages. 🤯
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Anita Meier @anitafmeier.bsky.social · 27/02/2026
Paper and image credit: www.cell.com/cell/fulltex...
cell.com
Giant DNA viruses encode a hallmark translation initiation complex of eukaryotic life
Giant DNA viruses encode a cap-binding complex homologous to eIF4F, the defining translation-initiation complex of eukaryotes. The viral cap-binding complex is required for viral protein synthesis and...
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Anita Meier @anitafmeier.bsky.social · 27/02/2026
Most viruses rely on the host to provide the entire translation machinery. However, giant viruses have evolved to encode part of the machinery themselves. Latest discovery: mimivirus (APMV) encodes its own initiation factor (vIF4F) and specifically promotes translation of viral mRNA!
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Anita Meier @anitafmeier.bsky.social · 19/02/2026
Check it out if you are at Imperial! The AWA always hosts great events!!
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Anita Meier @anitafmeier.bsky.social · 16/01/2026
Original paper: www.pnas.org/doi/10.1073/... Great read: www.pnas.org/doi/10.1073/...
pnas.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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Anita Meier @anitafmeier.bsky.social · 16/01/2026
Studying viruses helps us understand cellular processes: the breakthrough discovery of RNA splicing in 1977 was achieved by studying adenovirus (AdV) biology. They used mRNA/ DNA hybridization and electron microscopy.
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Anita Meier @anitafmeier.bsky.social · 16/12/2025
Excited for my new chapter at ETHZ
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D-BSSE, ETH Zurich @handle.invalid · 16/12/2025
Meet #postdocs who recently joined the D-BSSE @ethz.ch: Mélanie Roschewitz | lab of @michaelmoor.bsky.social advancing medical image analysis using AI tools > u.ethz.ch/auXVR & Anita Meier @anitafmeier.bsky.social | lab of #MartinFussenegger working on gene therapies > u.ethz.ch/8dFrx
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Anita Meier @anitafmeier.bsky.social · 02/12/2025
Image credit and awesome site in general: viralzone.expasy.org/125 Great review: Multipartite viruses: adaptive trick or evolutionary treat? | npj Systems Biology and Applications share.google/P6MyoPODiyOj...
viralzone.expasy.org
Nanoviridae ~ ViralZone
A knowledge resource to understand virus diversity and a gateway to UniProtKB/Swiss-Prot viral entries
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Anita Meier @anitafmeier.bsky.social · 02/12/2025
Some of the weirdest viruses: Multipartite viruses have segmented genomes that are enclosed in different capsids, which are independently transmitted. All segments have to meet in the same host cell for complementation. The evolutionary benefit for this lifestyle is unclear.
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Anita Meier @anitafmeier.bsky.social · 11/11/2025
Check out this beautiful paper (image credit): Zika virus NS1 drives tunneling nanotube formation for mitochondrial transfer and stealth transmission in trophoblasts | Nature Communications share.google/UYRV3BFpAROa...
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Zika virus NS1 drives tunneling nanotube formation for mitochondrial transfer and stealth transmission in trophoblasts - Nature Communications
Michita et al. show that Zika virus (ZIKV) NS1 induces tunneling nanotubes (TNTs) in placental cells, which facilitate viral spread and transport of mitochondria in placental cells. Infection with a N...
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Anita Meier @anitafmeier.bsky.social · 11/11/2025
Zika virus induces nanotube formation 👾 in the host cell to facilitate viral spread. ZIKV even uses them to acquire mitochondria from neighbouring uninfected cells!
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Anita Meier @anitafmeier.bsky.social · 14/08/2025
Image: EBNA1 401 to 641 structure with DNA Credit: Cryo-EM Structure and Functional Studies of EBNA1 Binding to the Family of Repeats and Dyad Symmetry Elements of Epstein-Barr Virus oriP | Journal of Virology journals.asm.org/doi/10.1128/...
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Cryo-EM Structure and Functional Studies of EBNA1 Binding to the Family of Repeats and Dyad Symmetry Elements of Epstein-Barr Virus oriP | Journal of Virology
EBV latent infection is causally linked to diverse cancers and autoimmune disorders. EBNA1 is the viral-encoded DNA binding protein required for episomal maintenance during latent infection and is con...
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Anita Meier @anitafmeier.bsky.social · 14/08/2025
Epstein-Barr virus encodes a protein called EBNA1, which physically tethers 🤝 the viral DNA to the host chromosome so it doesn't get lost during mitosis. www.cell.com/cell/fulltex...
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Sonja Schmid @scisonja.bsky.social · 31/07/2025
💥 We have 3 positions open in my lab in Basel, Switzerland🇨🇭: #nanopores #smFRET #biomolecular #dynamics #singleMolecules We’re looking for talented & ambitious new colleagues enthusiastic about biomolecular dynamics & single-molecule tech. Please share broadly, thank you!🤝 schmid.chemie.unibas.ch
schmid.chemie.unibas.ch
Home | Research Group Schmid | University of Basel
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Vicki Metzis @vmetzis.bsky.social · 01/08/2025
Application deadline for up to 5 @mrc-lms.bsky.social postdoc positions in developmental epigenetics closes soon - don’t miss out! Positions across both experimental and computational projects. Come and join our fantastic team science community!
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Anita Meier @anitafmeier.bsky.social · 27/06/2025
Don't forget to sign up to reserve your spot! 🍿🥂🍪Signing up now will also ensure that we order enough drinks and snacks!
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Anita Meier @anitafmeier.bsky.social · 27/06/2025
Beautiful article characterising how HSV-1 alters the host chromosome and nuclear architecture and image credit: www.nature.com/articles/s41...
nature.com
Herpes simplex virus type 1 reshapes host chromatin architecture via transcription machinery hijacking - Nature Communications
Here, the authors show how HSV-1 rewires the host cell’s chromatin architecture during lytic infection by hijacking transcription machinery and forming contacts between viral and host genomes.
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Anita Meier @anitafmeier.bsky.social · 27/06/2025
Herpes simplex virus type 1 (HSV-1) infections dramatically change the architecture of the host nucleus. HSV-1 specifically recruits certain host factors (e.g. RNAPII) to promote its replication. HSV-1 actively rewires the human genome! 😲Look at how the host genome gets squeezed!!
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Sjors Scheres @sjorsscheres.bsky.social · 25/06/2025
We have a 3-year funded postdoc position to work on structures of #amyloid filaments. If you are an expert in protein biochemistry, structural biology or #cryoEM / #cryoET, this could be for you! Feel free to email me with any questions. Come join us! 🤩 www.nature.com/naturecareer...
nature.com
Postdoctoral Scientist - Structural Studies - Dr Sjors Scheres - LMB 2640 - Cambridgeshire job with MRC Laboratory of Molecular Biology (LMB) | 12840844
Postdoctoral Scientist Starting Salary: £41,344 Fixed term: 3 years MRC Laboratory of Molecular Biology, Cambridge, UK We are looking for a postdoc...
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Louise Fets @louisefets.bsky.social · 25/06/2025
#JobAlert! We have an opening for a postdoctoral scientist in #CancerMetabolism in my lab @mrc-lms.bsky.social. If you're interested in the role of metabolism in drug response and resistance in cancer, and would like to work in a fun and friendly team, check it out: lms.mrc.ac.uk/work/vacanci...
lms.mrc.ac.uk
MRC Postdoctoral Research Scientist - MRC Laboratory of Medical Sciences
The MRC Laboratory of Medical Sciences (LMS) is a biomedical research institute where scientists and clinicians collaborate to advance the understanding of biology and its application to medicine. LMS...
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Anita Meier @anitafmeier.bsky.social · 18/06/2025
💥Our next AWA event is all about networking, mentorship and how to do it in a way that is right for you.😌 Sign up and come along. Everyone from Imperial/ MRC welcome! Limited spaces available, drinks and snacks included 🥂🧀
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Ilaria Belluomo @ilabell.bsky.social · 18/06/2025
🌟 The next event of the Academic Women Association (AWA) is happening! Registration and details here: www.eventbrite.co.uk/e/academic-w...
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Anita Meier @anitafmeier.bsky.social · 15/06/2025
It's apparently a glycoprotein fibril layer and used by the virus to attach itself to amoeba, its natural host. 😎 journals.asm.org/doi/10.1128/...
journals.asm.org
Mimivirus Fibrils Are Important for Viral Attachment to the Microbial World by a Diverse Glycoside Interaction Repertoire | Journal of Virology
ABSTRACT Acanthamoeba polyphaga mimivirus (APMV) is a giant virus from the Mimiviridae family. It has many unusual features, such as a pseudoicosahedral capsid that presents a starfish shape in one o...
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Anita Meier @anitafmeier.bsky.social · 14/06/2025
Image credit and great paper: www.nature.com/articles/s41...
nature.com
Tailed giant Tupanvirus possesses the most complete translational apparatus of the known virosphere - Nature Communications
Giant viruses are the largest viruses of the known virosphere and their genetic analysis can provide insights into virus evolution. Here, the authors discover Tupanvirus, a unique giant virus that has...
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Anita Meier @anitafmeier.bsky.social · 14/06/2025
This is a tupanvirus, ~450nm in diameter ~1.2um in length, clearly one of the giant viruses. It encodes for the most complete translational machinery found in viruses with only the ribosome lacking. Most (non-giant) viruses don't encode any components required for translation. It's so fluffy!! 😱
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Anita Meier @anitafmeier.bsky.social · 11/06/2025
Many viruses use the acidification of endosomes to change the conformation of their capsid/ envelope enabling the escape into the cytosol to ultimately infect the cell
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Anita Meier @anitafmeier.bsky.social · 11/06/2025
Blows my mind 🤯 that it is possible to capture the structural dynamics of viral capsid contraction by thawing and re-freezing the ice within the electron microscope! Anyone interested in microsecond time-resolved cryo-EM should check out this paper: www.nature.com/articles/s41...
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Anita Meier @anitafmeier.bsky.social · 07/05/2025
Weird virus fact: Bacteriophage 29 (Phi29) uses RNA to help package genomic DNA 🤯. This so-called packaging RNA (pRNA) is an essential part of the packaging motor, which is part of the newly formed viral capsid. Check out the pRNA (pink) in the beautiful structure: www.science.org/doi/10.1126/...
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Anita Meier @anitafmeier.bsky.social · 07/05/2025
This of course contributes to the carcinogenic properties of papillomaviruses.
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Anita Meier @anitafmeier.bsky.social · 06/05/2025
pmc.ncbi.nlm.nih.gov/articles/PMC...
pmc.ncbi.nlm.nih.gov
Telomeres and Telomerase During Human Papillomavirus-Induced Carcinogenesis
Human papillomaviruses (HPVs) belong to a small spherical virus family and are transmitted through direct contact, most often through sexual behavior. More than 200 types of HPV are known, a dozen or ...
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