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Alexandre Marand

@marand-lab.bsky.social
195 followers 184 following 33 posts

Assistant Professor at the University of Michigan. Chromatin biology, transcription regulation, plant genomes. marand-lab.github.io

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Reposted by Alexandre Marand
Bas Bargmann @bas-bargmann.bsky.social · 25/09/2026
I am very pleased to present the lab’s first #bluetorial! This concerns our recent publication in Development @dev-journal.bsky.social doi.org/10.1242/dev.... This work, led by postdoc (and former grad student) Kelsey Reed, is the result of many years of hard work by a wonderful team. (1/n)
doi.org
A protoplast-based method to visualize early cell biological events in plant cellular reprogramming and regeneration
Summary: This study presents a live-imaging platform for tracking individual plant protoplasts in culture, enabling analysis of cellular processes, signaling dynamics and developmental transitions.
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Reposted by Alexandre Marand
fabiogomezcano.bsky.social @fabiogomezcano.bsky.social · 20/09/2026
🚨How many reads in a single-cell barcode come from that cell? 🚨 We loaded maize and Arabidopsis nuclei into separate wells of the same scifi-ATAC plate. Arabidopsis barcode averaged 73% maize reads, yet standard QC looked normal! New preprint 🧵 biorxiv.org/content/10.6... 1/10
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Alexandre Marand @marand-lab.bsky.social · 17/09/2026
🚨New preprint🚨 from super postdoc, @fabiogomezcano.bsky.social, on modeling and removing ambient contamination (i.e. nuclei-free chromatin 🧬) in single-cell scifi-ATAC-seq experiments using his new tool, AmbientMapper. Feedback is welcome! www.biorxiv.org/content/10.6...
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bioRxivpreprint @biorxivpreprint.bsky.social · 17/09/2026
Empirical Estimation of Ambient Contamination in Combinatorial Single-Cell Methods Using Multi-Reference Mapping www.biorxiv.org/content/10.64898/20…
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Songwen Zhang @songwenz.bsky.social · 16/09/2026
Thrilled to share our new paper in Nature: We found how salicylic acid drives plant immune signaling — it binds its receptor NPR1 and allosterically boosts NPR1’s grip on the Mediator complex (via MED15), switching on defense genes. www.nature.com/articles/s41...
nature.com
Transcriptional activation of plant immunity by salicylic acid - Nature
A mechanistic basis for how the hormone salicylic acid promotes transcriptional activation during plant immune responses is described.
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Arvid Herrmann 🍃 @arvidhema.bsky.social · 08/09/2026
Very happy to see this work out as a preprint! 🌽🌱 How are shoot stem cells specified in the maize embryo? We uncover a small RNA-driven morphogenic circuit linking positional information with auxin, cell wall mechanics & cell division patterning. Check it out 👇 www.biorxiv.org/content/10.6...
biorxiv.org
Specification of embryonic shoot stem cells via a small RNA-driven morphogenic circuit
The specification of embryonic stem cells capable of self-renewing and differentiation into virtually any cell type, is one of the most consequential events in the development of a multicellular organ...
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Reposted by Alexandre Marand
Joe Gage @joegage10.bsky.social · 09/09/2026
Ribosomes get stuck in traffic. In plants, where they stall and how tightly they pile up helps decide whether an mRNA gets translated or destroyed. Now out in PNAS, led by @sjorsvdh.bsky.social and Julia Bailey-Serres. 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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Josh T Cuperus @rnanerd.bsky.social · 07/09/2026
Check out our preprint on Duckweed combo-stress responses and chromatin accessibility. ACRs have ⬆️ GC content much like maize, even with small genomes and low TE numbers. One speculation we had for this in maize was TE insertion avoidance, guess we were wrong. www.biorxiv.org/content/10.6...
biorxiv.org
Duckweeds as Multiplexable Plant Models for Exploring Abiotic Stress Responses
In nature, plants experience complex combinations of environmental stresses. Prior studies using Arabidopsis thaliana show that transcriptional responses to combinatorial stress are unique and cannot ...
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Reposted by Alexandre Marand
Joe Gage @joegage10.bsky.social · 27/08/2026
New preprint 3 of 3! Happy to have contributed to this one, led by @sjorsvdh.bsky.social: comparing Arabidopsis and maize monosome and disome Ribo-seq shows positional ribosome stalling patterns that are deeply conserved and others that are lineage-specific. www.biorxiv.org/content/10.6...
biorxiv.org
Ribosome stalling position, spacing, and A-site occupancy impact translation and co-translational mRNA decay in plants
Rate limitation in translational elongation causes ribosomes to pause as they decode an open reading frame (ORF). The triggers and outcomes of these events are poorly understood in plants. Here, we si...
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Reposted by Alexandre Marand
Joe Gage @joegage10.bsky.social · 27/08/2026
New preprint 1 of 3! GxE is everywhere, but what causes it at the molecular level? @skdeb.bsky.social led this project using allele-specific expression in a B73xMo17 hybrid to test whether sequence variation changes TF binding & drives cis-reg GxE in gene expression. www.biorxiv.org/content/10.6...
biorxiv.org
Cis-regulatory variation and transcription factor binding contribute to allelic genotype-by-environment interactions for gene expression in maize
Genotype-by-environment interactions (GxE), or differences in how genotypes perform across varying environments, are a pervasive source of phenotypic variation and underlie differences in local adapta...
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Alexandre Marand @marand-lab.bsky.social · 26/08/2026
A comprehensive understanding of heterosis has long been out of reach. Led by super postdoc Luguang Jiang, we applied scifi-ATAC-seq to three 🌽 inbred lines and their recip hybrids, and identified a widespread loss of cell-type-specific ACRs in hybrid genomes 🧬 1/10 www.biorxiv.org/content/10.6...
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bioRxivpreprint @biorxivpreprint.bsky.social · 21/08/2026
Cell-type-specific regulatory variation shapes maize heterosis www.biorxiv.org/content/10.64898/20…
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bioRxivpreprint @biorxivpreprint.bsky.social · 22/07/2026
Sequence-based modeling of plant epigenomes reveals cell-type-specific cis-regulatory grammar www.biorxiv.org/content/10.64898/20…
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Anders Sejr Hansen @andersshansen.bsky.social · 18/08/2026
Really interesting new paper from Krietenstein and Groth labs showing that FACT depletion has a dramatic effect on microcompartments leading to aberrant microcompartment (AMC) formation through loss of ordered nucleosomes: www.cell.com/molecular-ce...
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EPIGENETIC HULK @epigenetichulk.bsky.social · 19/08/2026
HAHAHAHAHAHAHAHAHAHAHAHAHAHA! EPIGENETIC HULK LIKE THIS SMASH! NO SMASH NOTES! www.cell.com/cell-genomic...
cell.com
Single-cell 3D genome imaging shows super-enhancer hubs are rare, nonspecific, and neither necessary nor sufficient for transcriptional bursting
Super-enhancers have been proposed to cluster in the nucleus when compared to other genomic elements. Le et al. found that super-enhancer clustering was rare and driven by non-specific interactions. P...
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Bas Bargmann @bas-bargmann.bsky.social · 11/08/2026
Get yer PR1::RUBY here! www.micropublication.org/journals/bio... Available through Addgene and ABRC (ABRC is still bulking up the seed) www.addgene.org/255430/ abrc.osu.edu/stocks/1211866
micropublication.org
A Non-Invasive Pathogen‑Responsive RUBY Reporter Enables Visible Monitoring of PR1 Activation | microPublication
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Brady Lab @bradylabs.bsky.social · 14/08/2026
Our latest preprint! A deep learning framework that maps suberin, lignin and aerenchyma in both monocots and dicots! We present a collection of 1,695 fluorescent images. One surprise-the model works best when trained on both monocots + dicots! www.biorxiv.org/content/10.6...
biorxiv.org
RADIX: a deep learning framework that maps root barriers across species and reveals genetic and environmental contributions
Root anatomical barriers, including the suberized and lignified walls of the endodermis and exodermis, and cortical aerenchyma, regulate water and nutrient transport, gas exchange, and rhizosphere int...
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Jeffrey Ross-Ibarra @jrossibarra.bsky.social · 12/08/2026
I am excited to announce a job for an Asst Prof in Plant Evolution in the dept. of Evolution and Ecology at @ucdavis.bsky.social. We're looking broadly, from macro (speciation, comparative genomics, evo-devo) to micro (pop biology, adaptive evolution, evo-eco). recruit.ucdavis.edu/JPF07777
recruit.ucdavis.edu
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bioRxiv Plant Bio @biorxiv-plants.bsky.social · 11/08/2026
The cellular and genetic basis of inflorescence divergence between maize and teosinte www.biorxiv.org/content/10.64898/20…
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Ian Henderson @hendersi.bsky.social · 25/07/2026
CRISPR-mediated centromere fission generates neochromosomes with distorted meiotic inheritance in Arabidopsis biorxiv.org/content/10.6... new preprint from us - includes changing the Arabidopsis karyotype from 5 -> 6 chromosomes using Cas9 & outcomes of 5/6 chromosome hybrid meiosis
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Joris Sprakel @jorissprakel.bsky.social · 25/07/2026
How do transcription factors bind DNA strongly, and in a switch like manner, while remaining sequence specific? Our new paper on a canonical plant TF suggests the answer is a previously underappreciated assembly state: transcription factor nanoclusters. www.science.org/doi/10.1126/...
science.org
Nanoclustering of a plant transcription factor enables strong yet specific DNA binding
Transcription factor nanoclusters balance the DNA binding trade-off between weakly binding oligomers and nonspecific condensates.
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Brady Lab @bradylabs.bsky.social · 25/07/2026
One of our recent papers describing techniques to identify root barriers to parasitic plant infection. Plus we show that lignin in the cortex can block branched broomrape infection of tomato.
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Adrienne Roeder Lab @roederlab.bsky.social · 10/07/2026
Ever stretch a plastic bag until it wrinkled? Keeping a thin sheet flat while it rapidly expands is surprisingly difficult. So how do growing plant leaves remain flat as they rapidly grow? Check out our new @currentbiology.bsky.social review, How to Grow a Flat Leaf www.cell.com/current-biol...
cell.com
How to grow a flat leaf
Peng et al. review mechanisms driving lamina expansion, including gene expression, auxin-mediated proliferation, and microtubule-directed growth, linking disrupted coordination to morphological defect...
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Michael Raissig @michaelraissig.bsky.social · 08/07/2026
🌾 Every grass leaf shares the same repeating short-long cell pattern in its epidermis. Our new #preprint identifies the protein that builds it. 🔬🧬 📄 preprint: www.biorxiv.org/content/10.6... 🧵⬇️ 1/11
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Michael Raissig @michaelraissig.bsky.social · 04/07/2026
🌾 Grass leaves are the photosynthetic powerhouses of human civilisation. @lbmountain.bsky.social's transcriptomic atlas of nearly 70,000 cells from shoot apex to mature leaf follows the genetic programs that form a grass leaf 🧬 paper doi.org/10.1093/plce... expression browser shiny.ips.unibe.ch
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Min-Yao Jhu @minyaojhu.bsky.social · 24/06/2026
1/ Excited to share our new bioRxiv preprint! "4D spatial transcriptomics reveals nodule identity emerges through stacked parallel developmental programs" 📄 doi.org/10.64898/202... Using Xenium, we generated a 4D (3D space + time) atlas of nodule development in Medicago truncatula.
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Sebastián Moreno-Ramírez @sebamorenor.bsky.social · 22/06/2026
Excited to share that our work on single-nucleus RNA-seq of the shoot apical meristem — the shoot stem cell niche — has found a home. #Plantascience #scRNAseq #stemcells www.science.org/doi/10.1126/...
science.org
Single-nucleus transcriptomics resolves multiple fate dynamics between inflorescence meristem and primary stem
snRNA-seq reveals shoot stem cell heterogeneity and traces their differentiation into primary stem cell types.
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Jonas Koeppel @jonaskoeppel.bsky.social · 04/06/2026
1/n What fraction of the human genome is essential for cells? Excited to share our preprint that explores this question by combining an unusual CRISPR system, phage promoters, and thousands of deletion launchpads. @sudpinglay.bsky.social @jshendure.bsky.social www.biorxiv.org/content/10.6...
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Etienne Bucher 🌾🧬🇪🇺 @plantepigenetics.ch · 05/06/2026
We just published our new paper about an active Helitron transposon in wheat 🌾🧬 We found that it can be mobilised by heat stress when DNA methylation is reduced. We document its full lifecycle: RNA -> circular DNA -> integration www.nature.com/articles/s41... #TEsky
nature.com
An active Helitron transposon family in wheat - Nature Plants
Helitrons are a recently identified category of transposons. This study reveals that heat stress combined with reduced DNA methylation can mobilize a Helitron family in wheat. Its mobilization is gene...
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José Dinneny @josedinneny.bsky.social · 02/06/2026
So proud to share our latest publication @CellCellPress! Yue Rui reveals that the same enzyme that makes the wall, cellulose synthase complex (CESA), also tethers the plasma membrane to the wall during water-deficit stress, providing resilience. sciencedirect.com/science/articl…
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bioRxiv Genomics @biorxiv-genomic.bsky.social · 24/05/2026
Analysis of multi-way chromatin interactions at sub-nucleosome resolution identifies synergistic nano-scale interactions within super-enhancers www.biorxiv.org/content/10.64898/20…
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Anthony Vecchiarelli @cellforganized.bsky.social · 13/04/2026
New preprint from the Vecchiarelli Lab! 🧵 Congratulations to first author Dr. Claire Dudley! @claire-dudley.bsky.social Claire uncovered a critical player in the organization for the photosynthetic cytoplasm of cyanobacteria - polyphosphate! #polyP www.biorxiv.org/content/10.6...
biorxiv.org
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Alexandre Marand @marand-lab.bsky.social · 23/05/2026
Plants are unique in that single somatic cells have the remarkable potential to dedifferentiate and regenerate entirely new plants. However, the cell types and regulatory dynamics enabling dedifferentiation competence have not been fully explored... until now ⬇️ (1/12)
Scientific figures illustrating protoplast molecular and cellular phenotypes
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Ghent Rooting-lab/Steffen Vanneste @stvanneste.bsky.social · 22/05/2026
#dedifferentiation depends on cell type. This is what happens when you make protoplasts 👌
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Travis Lee @tralee-sci.bsky.social · 22/05/2026
How do cells break symmetry to generate new shape and form? Using the apical hook as a model, we @joeecker.bsky.social applied spatial and single-cell multiomics, and identify a regulatory hotspot in a transient cell niche that drives this U-shaped structure 1/8 bsky.app/profile/bior...
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Alexandre Marand @marand-lab.bsky.social · 22/05/2026
Thrilled to announce our newest preprint on #dedifferentiation in Arabidopsis 🧬🌱. We used scRNA-seq and hormone treatments to track transcriptional reprogramming in diverse somatic cell types and found what we think is some pretty cool biology. Feedback welcome! www.biorxiv.org/content/10.6...
biorxiv.org
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Nature Plants @natplants.nature.com · 22/05/2026
New OA Resource: "A transcriptional atlas of early Arabidopsis seed development suggests mechanisms for inter-tissue coordination" rdcu.be/fj8H2 Single-nucleus RNAseq profiling of early Arabidopsis seed development. #PlantScience
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Natanella Illouz-Eliaz @natanellae.bsky.social · 12/05/2026
Excited to share that I will be opening my lab this fall at the @weizmanninstitute.bsky.social in the Department of Plant & Environmental Sciences! I am looking for postdocs interested in plant biology, stress biology, and single-cell technologies. #PlantBiology #SingleCell #Epigenomics #Postdoc
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Jeffrey Ross-Ibarra @jrossibarra.bsky.social · 09/05/2026
I would encourage plant genomics folks to attend -- organizers are interested in more plant people, and while you have to listen to weird things like cancer, there's lot of technologies and ideas that plant folks could benefit from hearing.
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Dolf Weijers @dolfweijers.bsky.social · 03/05/2026
We are very happy and proud to present a study led by @jorgehg.bsky.social (now PI in Madrid – keep an eye on him!) in our team @bic-wur.bsky.social. In this work, we discover how auxin-regulated ARF transcription factors learned to activate transcription. A 🧵…(1/17) www.biorxiv.org/content/10.6...
biorxiv.org
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Alfonso Martinez Arias @amartinezarias.bsky.social · 02/05/2026
A clear/significant finding derived from the single cell (sc) analysis of biological systems has been the realization that phenotypically homogeneous populations are heterogeneous at the level of gene expression (GE). www.cell.com/fulltext/S00... 🧵
cell.com
Nature, Nurture, or Chance: Stochastic Gene Expression and Its Consequences
Gene expression is a fundamentally stochastic process, with randomness in transcription and translation leading to cell-to-cell variations in mRNA and protein levels. This variation appears in organis...
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Maxim Greenberg @maxvcg.bsky.social · 01/05/2026
This a very important, and extremely well-executed study from Ralph Grand’s group @uniheidelberg.bsky.social. Congrats to all the authors! www.biorxiv.org/content/10.6...
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Tobias Jores @tobiasjores.bsky.social · 30/04/2026
📢Out now on bioRxiv: We used Plant STARR-seq to characterize the species- and condition-specific enhancer activity of over 350,000 sequences derived from four plant species. For more, see below and read the paper at: www.biorxiv.org/content/10.6...
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Jeffrey Ross-Ibarra @jrossibarra.bsky.social · 30/04/2026
The maize community is so privileged to have the amazing support of @maizegdb.bsky.social. I don’t think we could do most of what we do without them. Check out their most recent work including large dna model prediction of effects here academic.oup.com/genetics/art...
academic.oup.com
Delivering artificial intelligence–ready genomics with the Maize Genetics and Genomics Database
Abstract. The integration of artificial intelligence (AI) into computational biology is changing biological research, particularly in agriculture, where la
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Jim Leebens-Mack @jleebensmack.bsky.social · 29/04/2026
Thank you, Vanessa, Mike and all involved! So many cool findings described in this work, including parallel evolution of leaf shape and the rapid radiation of Scalesia after genome doubling and Galápagos arrival.
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PlantEvolution 🌱🌾 @plantevolution.bsky.social · 28/04/2026
Fantastic paper led by Matthew Davis from @grey-monroe.bsky.social, on genome degradation in long-term walnut tissue culture: Somatic embryogenesis increases mutation rates >30x, with aneuploidy, large deletions, somatic recombination, and elevated #TE activity. www.pnas.org/doi/10.1073/...
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Lewsey Lab @lewseylab.bsky.social · 24/04/2026
Latest paper from the lab with several collaborators: We've built a four-dimensional spatial transcriptome atlas of barley grain development and germination, allowing detailed interrogation of where and when genes are expressed academic.oup.com/plcell/artic...
academic.oup.com
A four-dimensional spatial transcriptome atlas of barley caryopsis development and germination
A four-dimensional spatial gene expression transcriptome atlas of Hordeum vulgare (barley) grain development and germination revealed tissue, cell, cluster
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Gitta Coaker @gittacoaker.bsky.social · 18/04/2026
We are hiring! We’re excited to recruit a postdoc to our lab at UC Davis to work on plant immune engineering and single-cell analyses of plant pathogen interactions. Apply by June 1. Please repost. www.coakerlab.org/postdoctoral...
Postdoctoral Scholar position in the Coaker group
University of California, Davis
We are seeking a Postdoctoral Scholar to join our research program focused on immune receptor engineering and spatial analyses of plant pathogens interactions using computational and imaging approaches. The position will involve integration of molecular, imaging, and computational approaches. Relevant publications from the laboratory include Nature Plants (2025, PMID: 40721669), Proceedings of the National Academy of Sciences (2024, PMID: 38814867), and Cell Reports (2023, PMID: 37342910). https://www.coakerlab.org/
Qualifications:
•	Ph.D. in plant biology, molecular biology, genetics, computational biology, or a related field
•	Strong background in genomics and/or computational biology 
•	First author publications in peer-reviewed journals
•	Ability to work both independently and collaboratively in a multidisciplinary environment
•	Experience in plant innate immunity is preferred

Application Instructions:
The position is initially available for two years, with the possibility of extension based on performance and funding. Salary is based on the University of California postdoctoral salary scale (https://www.ucop.edu/academic-personnel-programs/_files/2025-26/represented-oct-2025-scales/t23.pdf). The salary range for this position is $69,073-$82,836 US Dollars/year. 
Review of applications will begin June 1, 2026 and will continue until the position is filled.
Please submit a CV, a brief statement of research interests (~1 page), and contact information for three references to glcoaker@ucdavis.edu. The research statement should describe your previous work, how your expertise aligns with ongoing research in the lab, and potential future research directions.
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cxqiu.bsky.social @cxqiu.bsky.social · 09/04/2026
New preprint @cxqiu.bsky.social @jshendure.bsky.social ! Can we learn regulatory grammars of human cell types — by training on mouse development and transferring across 241 mammalian genomes? Introducing STEAM & a whole-organism scATAC-seq atlas from E10 to birth. www.biorxiv.org/content/10.6...
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Nature Reviews Genetics @natrevgenet.nature.com · 31/03/2026
FYI: New online! Gene regulatory networks: from correlative models to causal explanations
dlvr.it
Gene regulatory networks: from correlative models to causal explanations
Nature Reviews Genetics, Published online: 09 March 2026; doi:10.1038/s41576-026-00939-1In this Perspective, Maizels and Briscoe discuss the limitations of current models of gene regulatory networks and outline solutions to harness data abundance without compromising explanatory power.
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