Tommy Vierbuchen

@tvierbuchen.bsky.social

VP Research at Cellular Intelligence. Formerly Assistant Professor Dev Bio Program + Center for Stem Cell Biology at Sloan Kettering. cellularintelligence.com

This perspective piece reviews new omics, developmental genetic, and cell lineage studies to critically review current models of developing forebrain organization. Spoiler: there are _serious_ problems with the prosomere model.

Elizabeth Manning@emmanning.bsky.social · 3mo ago

Well done to @elsieplace.bsky.social, Marysia Placzek and @sethblackshaw.bsky.social for this beautifully clear overview of a very complex history of brain developmental models www.sciencedirect.com/science/arti...

For decades, molecular biology and human genetics have been built around measurements of average gene expression. That was partly conceptual, but also technological: for a long time, the mean was the quantity we could measure most reliably. Our new preprint argues that this framework is incomplete.

🧵 CTCF is essential for embryonic development, but why has remained unclear. By combining gastruloids with a temporal degron system, we uncovered a surprising dual function — and it changes how we think about CTCF's role in development. 1/8 www.biorxiv.org/content/10.6...

A dual role for CTCF in development

CTCF is an essential DNA binding protein whose absence leads to embryonic lethality. CTCF is primarily known for its role in 3D genome organization where its N-terminal domain interacts with cohesin to anchor chromatin loops. How CTCF facilitates proper embryonic development remains unclear, necessitating temporal control to resolve its stage-specific functions. By combining gastruloids, an in vitro model of embryonic development, with a degron system to rapidly deplete CTCF at defined timepoints, we show that early CTCF depletion impairs early gastruloid morphogenesis. Surprisingly, ATAC-seq and time-resolved RNA-seq revealed that differentiation was unaffected. CTCF binding is strongly enriched at promoters of downregulated genes. Re-expression of a CTCF variant with an N-terminal truncation, incapable of looping, was sufficient to rescue the expression of CTCF-promoter bound genes and the defects in morphogenesis. However, extended culture (up to 168 hours) of gastruloids reconstituted with N-terminal truncated CTCF led to their collapse. Our work shows that CTCF has a dual function in early mammalian development: at early stages CTCF regulates developmentally important genes through promoter binding, while at later stages its looping function is required for correct development. ### Competing Interest Statement The authors have declared no competing interest. European Research Council, https://ror.org/0472cxd90, 637587, 865459 Dutch Research Council, https://ror.org/04jsz6e67, 016.161.316, VI.C.222.049 Dutch Cancer Society, https://ror.org/0368jnd28, N/A

biorxiv.org

JAX is proud to announce that Professor Bill Skarnes has been selected as the 17th recipient of the International Society for Transgenic Technologies (@transtechsociety.org) Prize, one of the highest honors in the field. 🧬 🧪

The Jackson Laboratory's Bill Skarnes wins top international prize in transgenic science

Skarnes' groundbreaking contributions to transgenic technologies and genome engineering made a generation of experiments possible

jax.org