Sign in

Ophir Shalem

@ophirshalem.bsky.social
1.3K followers 746 following 21 posts

Scientist, Associate Professor, Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Children’s Hospital of Philadelphia Functional genomics, Proteostasis, Neurodegeneration www.shalemlab.org

PostsRepliesMedia
Ophir Shalem @ophirshalem.bsky.social · 13/06/2026
New preprint led by @camarapg.bsky.social lab as part of our ongoing collaboration to develop the essential tools for pooled scalable optical profiling of the neuronal proteome
020
Ophir Shalem @ophirshalem.bsky.social · 02/03/2026
As we are sending back the revised version of our pooled prime editing gene tagging paper, I am happy to share a website for design of prime tagging libraries, including some images, all generated from a single pooled transduction and in situ sequencing. primetagging.org
primetagging.org
Prime Tagging
173
Reposted by Ophir Shalem
John Murray @jisaacmurray.bsky.social · 20/06/2025
Happy to announce our paper comparing embryonic gene expression between C. elegans and C. briggsae, work led by Christopher Large with Rupa Khanal and in collaboration with Junhyong Kim and Bob Waterston. www.science.org/doi/10.1126/...
science.org
Lineage-resolved analysis of embryonic gene expression evolution in C. elegans and C. briggsae
The constraints that govern the evolution of gene expression patterns across development remain unclear. Single-cell RNA sequencing can detail these constraints by systematically profiling homologous ...
58132
Ophir Shalem @ophirshalem.bsky.social · 17/06/2025
Congratulation @shiraweingarten.bsky.social! Beautiful work!
121
Ophir Shalem @ophirshalem.bsky.social · 01/05/2025
Excited to to see our collaboration with @gburslem.bsky.social published today! This is part of our ongoing long term goal of achieving scalable non-disruptive and direct imaging and perturbation of the endogenous proteome
1297
Ophir Shalem @ophirshalem.bsky.social · 23/04/2025
Check out our paper, now extensively revised and published in @cp-molcell.bsky.social! This has been a real tour de force led by Stephanie Sansbury and @ysereb.bsky.social and we are very excited about the findings and future potential of this approach www.cell.com/molecular-ce...
cell.com
Pooled tagging and hydrophobic targeting of endogenous proteins for unbiased mapping of unfolded protein responses
Sansbury and Serebrenik et al. use pooled gene tagging with in situ sequencing and high-throughput image analysis to generate a cell pool with endogenous HaloTag fusions. Hydrophobic targeting is then...
24113
Reposted by Ophir Shalem
Arjun Raj @arjunraj.bsky.social · 17/03/2025
Super excited to be launching NimbusImage.com! Cloud-based image analysis to democratize machine learning! Documentation here! docs.nimbusimage.com
nimbusimage.com
NimbusImage
79134
Reposted by Ophir Shalem
George Burslem @gburslem.bsky.social · 28/02/2025
Two new preprints online today! One with @dremilygoldberg.bsky.social on lysine lactylation www.biorxiv.org/content/10.1... Another with @taabaman.bsky.social on new peptide tools to study caspases www.biorxiv.org/content/10.1...
biorxiv.org
Class I histone deacetylases catalyze lysine lactylation
Metabolism and post-translational modifications (PTMs) are intrinsically linked and the number of identified metabolites that can covalently modify proteins continues to increase. This metabolism/PTM ...
194
Reposted by Ophir Shalem
George Burslem @gburslem.bsky.social · 25/02/2025
We have a postdoc position available for a very cool collaborative project! Synthetic chemistry expertise is a must! Unfortunately due to the funding source, this position is only available to US citizens or permanent residents. chemistryjobs.acs.org/job/postdoct...
chemistryjobs.acs.org
043
Ophir Shalem @ophirshalem.bsky.social · 05/02/2025
Pooled optical screening bootcamp!
060
Ophir Shalem @ophirshalem.bsky.social · 23/12/2024
Huge congratulations to former lab postdoc @ysereb.bsky.social for starting his own independent lab! Make sure to follow him for exciting future science and check out his lab if you are looking for opportunities in the NJ/NY area!
070
Reposted by Ophir Shalem
Doug Epstein @epsteind.bsky.social · 22/11/2024
Our study with @ericjoyce.bsky.social led by Jailynn Harke is out. We show that allelic configurations at the Shh locus are predominately compact in the mouse forebrain, and that long range E-P interactions rely on transcription dependent and independent mechanisms. www.cell.com/molecular-ce...
cell.com
Multiple allelic configurations govern long-range Shh enhancer-promoter communication in the embryonic forebrain
Harke et al. use sequential DNA-FISH to achieve single-allele resolution of the Sonic hedgehog (Shh) regulatory domain in the mouse forebrain. They show that multiple allelic configurations occur inde...
22811
Reposted by Ophir Shalem
Struan Grant @struangrant.bsky.social · 25/11/2024
Late-stage graduate students and junior postdoctoral fellows are invited to attend the 2025 Recruitment Summit for CHOP/Penn Postdoctoral Scholars in Cell Biology and Genomics careers.chop.edu/us/en/event/...
careers.chop.edu
Recruitment Summit for Postdoctoral Scholars in Cell Biology and Genomics | Children’s Hospital of Philadelphia
Recruitment Summit for Postdoctoral Scholars in Cell Biology and Genomics in Philadelphia, Pennsylvania, United States. null at Children’s Hospital of Philadelphia
02829
Reposted by Ophir Shalem
Michael P Hart 🏳️‍🌈 (he/him) @michaelphart1.bsky.social · 11/11/2024
New paper ALERT!! Mara Cowen, PhD discovered and defined how conserved autism-associated genes modify a 'social' behavior in C. elegans!! So proud of her work in the lab! www.nature.com/articles/s41...
nature.com
Conserved autism-associated genes tune social feeding behavior in C. elegans - Nature Communications
C. elegans aggregate in large clumps during feeding. Here, the authors find conserved autism-associated genes mediate distinct molecular and circuit signaling components that tune C. elegans feed...
44312
Ophir Shalem @ophirshalem.bsky.social · 15/11/2024
Fascinating work from Jongens and @erikaholzbaur.bsky.social labs showing that FMRP granules mark mitochondrial fission sites in axons and dendrites and serve as sites of local translation! t.co/wXqtte3pqp
t.co
https://www.nature.com/articles/s41556-024-01544-2
085
Reposted by Ophir Shalem
John Doench @johndoench.bsky.social · 15/11/2024
Happy Friday! New preprint to discuss, led by @ekaplan.bsky.social, entitled "Activity-based selection for enhanced base editor mutational scanning" www.biorxiv.org/content/10.1... A thread...
biorxiv.org
Activity-based selection for enhanced base editor mutational scanning
Base editing is a CRISPR-based technology that enables high-throughput, nucleotide-level functional interrogation of the genome, which is essential for understanding the genetic basis of human disease...
75818
Reposted by Ophir Shalem
Michael Ward @michael-e-ward.bsky.social · 15/11/2024
Pathogenic proteotoxicity of cryptic splicing is alleviated by ubiquitination and ER-phagy www.science.org/doi/10.1126/...
science.org
Pathogenic proteotoxicity of cryptic splicing is alleviated by ubiquitination and ER-phagy
RNA splicing enables the functional adaptation of cells to changing contexts. Impaired splicing has been associated with diseases, including retinitis pigmentosa, but the underlying molecular mechanis...
093
Ophir Shalem @ophirshalem.bsky.social · 10/11/2024
Happy to share our new paper where we explore why dCas9-KRAB protein levels drop so drastically after neuronal differentiation in WTC11 and KOL2.1J iPSC lines. www.biorxiv.org/content/10.1...
biorxiv.org
CRISPR associated enzymes are mislocalized to the cytoplasm in iPSC-derived neurons resulting in KRAB-specific degradation
The use of CRISPR-associated enzymes in iPSC-derived neurons for precise gene targeting and high-throughput gene perturbation screens offers great potential but presents unique challenges compared to ...
194