Samuel A. Myers' lab

@samyers-lab.bsky.social

Laboratory for Immunochemical Circuits at the La Jolla Institute for Immunology. Dept. of Pharmacology and Moore's Cancer Center, UCSD. Global Autoimmune Institute Assistant Professor. samyerslab.org

The window for public comments is still open but closes soon (tonight!) for NSF's proposed changes to require approval by political appointees, add restrictions to publishing & communication of research, and ban international collaborations.

Stand Up for Science!@standupforscience.net · last wk.

🚨WARNING🚨 Today is the LAST DAY to leave your public comment on the NSF Proposal. The Proposal implements some of Vought's Science-Destroying OMB Proposal plans in advance: zurl.co/9nywR Leave your public comment TODAY using our guide & tool: fight2win.standupforscience.net/campaign/Pro...

1/ Excited to share a new preprint! My PhD student Claire asked why neonatal mice become resistant to experimental cholera as they age. Turns out, early-life acquisition of maternally transmitted lactobacilli helps protect against experimental cholera www.biorxiv.org/content/10.6...

Early-life acquisition of Lactobacillaceae protects against experimental cholera

Cholera causes severe diarrheal illness in young children, but the mechanisms underlying age-dependent susceptibility remain unclear. Experimental cholera in neonatal mice recapitulates age-dependent ...

biorxiv.org

(BioRxiv All) GLproxScape reconstructs spatial chromatin occupancy landscapes from tiled genomic locus proteomics: Genomic locus proteomics combines proximity labeling with mass spectrometry to identify the proteins associated with user-defined genomic loci. However,… #BioRxiv #MassSpecRSS

GLproxScape reconstructs spatial chromatin occupancy landscapes from tiled genomic locus proteomics

Genomic locus proteomics combines proximity labeling with mass spectrometry to identify the proteins associated with user-defined genomic loci. However, per-region enrichment values from tiledguide designs are typically pooled before hit calling, collapsing the latent spatial structure encodedby overlapping measurements. Here, we describe GLproxScape, an R package that treats per-region enrichments as indirect spatial measurements and reconstructs latent chromatin occupancylandscapes through a Gaussian labeling-kernel forward model. Sequence-specific transcriptionfactors are resolved by motif-anchored non-negative least-squares deconvolution against JASPARor HOCOMOCO position weight matrices, while chromatin regulators which lack defined DNA-binding motifs are inferred as broad occupancy zones, enabling recovery of overlapping membersof multi-subunit complexes. Applied to published genomic locus proteomics datasets at the humanTERT, MYC, FOXP2, and FOXQ1 loci and the mouse Ripk3 locus, GLproxScape recovered knownregulators with predicted positions independently supported by ChIP-Atlas peaks, reconstructedcandidate co-binding relationships, and identified chromatin complexes inaccessible to pooledanalyses. Systematic sgRNA-ablation experiments further showed that densely tiled designsimprove event recovery and positional stability, providing concrete experimental guidance for futuregenomic locus proteomics studies.

dlvr.it

Preprint out! We optimized synchro-PASEF for phosphoproteomics & found equivalent biological insights to dia-PASEF despite fewer total IDs. Practical tip: apply retention time summation factor 2 to any PASEF phosphoproteomics data—you'll gain IDs and precision. www.biorxiv.org/content/10.6...

Systematic optimization and benchmarking of synchro-PASEF for high-throughput phosphoproteome profiling

High-throughput data-independent acquisition (DIA) workflows paired with short chromatographic separations are increasingly adopted for systems biology and clinical proteomics. However, narrower peak ...

biorxiv.org