Chris Hsiung
@chrishsiung.bsky.social
Assistant Professor at UCSF | molecular biologist interested in emergent properties of genetic elements | www.hsiunglab.org | #ClimateCrisis
Excited to see James' Genome-wide Absolute Quantification of Looping paper out in @natsmb.nature.com : www.nature.com/articles/s41... This has been in collaboration with @lucagiorgetti.bsky.social @leonidmirny.bsky.social @zechnerlab.bsky.social labs. Brief thread below on some key updates
Anders Sejr Hansen@andersshansen.bsky.social · 2y agoExcited to share James Jusuf's preprint: By integrating Micro-C with SuperRes Live-Imaging we can calibrate genomics&imaging to perform absolute quantification of looping (e.g. this loop is present 3%) We quantify mESC 36k loops: <loops> are generally rare (2.3%) www.biorxiv.org/content/10.1...
Why can't we explain enhancer action despite 2 decades of chromosome conformation technologies? 😬 Our new study spearheaded by Leonid Mirny's group points to a flaw in our assumptions, and to a solution from physical principles By @timothyfoldes.bsky.social 💻& @karissalhansen.bsky.social 🧪 🧵👇
Our lab is proud to present our latest work harnessing Bridge Recombinase for genome-scale editing in diverse bacteria, microbiome editing, and programmable horizontal gene transfer.
bioRxiv Synthetic Biology@biorxiv-synthbio.bsky.social · 4mo agoBridge recombinase enables versatile rewriting of bacterial genomes https://www.biorxiv.org/content/10.64898/2026.04.29.721476v1
Faculty search at the Institute for Human Genetics at UCSF. Come be my colleague! aprecruit.ucsf.edu/JPF06052
Faculty Positions - Institute for Human Genetics
University of California, San Francisco is hiring. Apply now!
aprecruit.ucsf.edu
Excited to share our discovery of a new programmable RNA-guided DNA-targeting system hiding inside bacteriophages that predates CRISPR. We call it VIPR (Viral Interference Programmable Repeat), and it uses an entirely new logic to find its targets. Thread + link below.
Harvey Yang and I were fortunate to contribute polymer simulations to this paper from @nicholas-aboreden.bsky.social Zhao... Zhang, Blobel showing that most CRE loops can form de novo after mitosis without loop extrusion www.nature.com/articles/s41...
A short Bluetorial on plots of NIH application success rates as a function of percentile. 1/20
a cartoon says hey everybody an old man 's talking while bart simpson looks on
ALT: a cartoon says hey everybody an old man 's talking while bart simpson looks on
media.tenor.com
We are also considering postdoc candidates with deep perspectives on transcription factor / chromatin biology, and would like to tackle such topics using high-throughput synthetic biology approaches.
Chris Hsiung@chrishsiung.bsky.social · 9mo agoMy lab at UCSF is recruiting postdoc candidates interested in CRISPR synthetic biology and functional genomics approaches to study and engineer tissue injury responses! hsiunglab.org
Been working on a really strange retron bacterial immune system, here's the preprint: www.biorxiv.org/content/10.1... Type VI retrons are unlike any other. Phage infection triggers reverse transcription of a DNA fragment that activates translation of a toxin to kill the infected cell.
Bay Area Chromatin Club today at UCSF Mission Bay. Great mechanistic talks from UCSF, Berkeley, Stanford, UCSC, and Genentech. High attendance, awesome posters, many great questions and interactions. (Photo credit to Active Motif, who generously support this awesome series). See you at the next one!
I am absolutely holding Fisher Scientific to what is printed on this order.
Delighted to see this published: H3K115 acetylation is associated with fragile nucleosomes at CpG island promoters and active regulatory sites. Great work from all contributors; Yatendra Kumar, @illingworth-lab.bsky.social @eliasfriman.bsky.social @helink.bsky.social doi.org/10.7554/eLif...
Thanks to New Scientist for coverage of exciting new work from Doudna Lab & first author Wayne Ngo — self-amplifying #GeneEditing for targeting hard-to-target organs like the brain. Read the article: https://ow.ly/fYu650YfseV Or the preprint: https://ow.ly/hfb850YfseT
Ucsf faculty search for a genome editing delivery expert, come be my colleague!
UCSF Broad Stem Cell Center@ucsfstemcell.bsky.social · 7mo agoThe UCSF Broad Stem Cell Center and Department of Surgery invite applications for a new faculty position focused on the development of delivery tools for gene editing to enable cutting-edge gene therapies. Please share and apply 🔗 aprecruit.ucsf.edu/JPF05914
Sign on and share the letter honoring Dr. Jane Ying Wu's memory today! The deadline has been extended to Tuesday, Feb. 3rd at 12 pm ET. Join nearly 850 and help us reach 1,000. Let us be united, standing up for fairness, transparency, and dignity. Sign on: buff.ly/u656wy3
Blog post: Chance favors the (theoretically) prepared mind Data is big, machines are learning, so what good is theory anyway? Isn't most discovery driven by serendipity anyway, with theory mostly a "post-mortem"? I argue that this view discounts the value of theory. open.substack.com/pub/arjunraj...
Chance favors the (theoretically) prepared mind
In defense of the role of theory in innovation
open.substack.com
Blog post: Just quit Quitting projects in science is hard, but we should be doing a lot more of it. open.substack.com/pub/arjunraj...
Just quit
Quitting projects in science is hard, but we should be doing a lot more of it.
open.substack.com
Excited to share our new preprint from the Klose lab, where we investigate how SET1/MLL complexes shape H3K4me3 and regulate transcription in mouse ES cells. www.biorxiv.org/content/10.6...
SET1/MLL complexes control transcription independently of H3K4me3
Histone H3 lysine 4 trimethylation (H3K4me3) at gene promoters is thought to play a central role in gene transcription. H3K4 methylation is deposited by the SET1 (A/B) and MLL (1-4) multi-protein comp...
biorxiv.org
Updated job posting description for our postdoc recruitment to include interest in immuno-oncology
Chris Hsiung@chrishsiung.bsky.social · 9mo agoMy lab at UCSF is recruiting postdoc candidates interested in CRISPR synthetic biology and functional genomics approaches to study and engineer tissue injury responses! hsiunglab.org
My lab at UCSF is recruiting postdoc candidates interested in CRISPR synthetic biology and functional genomics approaches to study and engineer tissue injury responses! hsiunglab.org
So awesome to have this great paper from Sam Reffsin and Sara Cherry out! In it, we use retrospective clone tracing to show that there are particular single cell states that are more susceptible to viral infection (both SARS-CoV-2 and flu)! www.cell.com/cell/fulltex...
Single-cell susceptibility to viral infection is driven by variable cell states
Not all cells that can be infected by a virus become infected with that virus. Single-cell clone tracing reveals intrinsic cell states with variable expression patterns that increase susceptibility to...
cell.com
biology is so cool because like every week someone is like "Dr. Smith is coming to campus! She is the world expert in blargyblarg!" And i'm like A) never heard of blargyblarg, B) look it up, it's super important and interesting
(3/n) Do mitotic microcompartments have a transcriptional function? Prior work from @chrishsiung.bsky.social Gerd Blobel discovered 'mitotic transcriptional spiking', where ~half of genes transcriptionally spike in mitosis. We now show that microcompartment dot number and strength predicts spiking
Really excited to share our latest work led by @mattiaubertini.bsky.social and @nesslfy.bsky.social: we report that cohesin loop extrusion creates rare but long-lived encounters between genomic sequences which underlie efficient enhancer-promoter communication. www.biorxiv.org/content/10.1... A🧵👇
Another paper bluetorial! Today: how does the spatial location of genes influence their function? (1/n) www.nature.com/articles/s41...
The nuclear periphery confers repression on H3K9me2-marked genes and transposons to shape cell fate - Nature Cell Biology
Marin et al. report the role of lamin proteins and the lamin B receptor (LBR) in chromatin positioning at the nuclear periphery. Knockout of all lamins and LBR in mouse embryonic stem cells leads to h...
nature.com
What do GWAS and rare variant burden tests discover, and why? Do these studies find the most IMPORTANT genes? If not, how DO they rank genes? Here we present a surprising result: these studies actually test for SPECIFICITY! A 🧵on what this means... (🧪🧬) www.biorxiv.org/content/10.1...
Specificity, length, and luck: How genes are prioritized by rare and common variant association studies
Standard genome-wide association studies (GWAS) and rare variant burden tests are essential tools for identifying trait-relevant genes. Although these methods are conceptually similar, we show by anal...
biorxiv.org
New preprint! We solve a mystery you didn't know existed. Mitotic cells lack new transcription but require ongoing translation. Interphase mRNA half life is only 2-4 hrs. So how do cells arrest in mitosis for hours without depleting their transcriptomes? www.biorxiv.org/content/10.1...
Global inhibition of deadenylation stabilizes the transcriptome in mitotic cells
In the presence of cell division errors, mammalian cells can pause in mitosis for tens of hours with little to no transcription, while still requiring continued translation for viability. These unique...
biorxiv.org