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Cerebral organoids, three-dimensional cultures that model organogenesis, provide a new platform to investigate human brain development. High cost, variability, and tissue heterogeneity limit their broad applications. Here, we developed a miniaturized spinning bioreactor (SpinΩ) to generate forebrain-specific organoids from human iPSCs. These organoids recapitulate key features of human cortical development,...
TET proteins oxidize 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC), and 5-carboxylcytosine (5caC). 5fC and 5caC are excised by mammalian DNA glycosylase TDG, implicating 5mC oxidation in DNA demethylation. Here, we show that the genomic locations of 5fC can be determined by coupling chemical reduction with biotin tagging. Genome-wide mapping of 5fC in mouse embryonic...
Foxp3 + regulatory T (Treg) cells maintain immune homeostasis by limiting different types of inflammatory responses. Here, we report that miR-146a, one of the miRNAs prevalently expressed in Treg cells, is critical for their suppressor function. The deficiency of miR-146a in Treg cells resulted in a breakdown of immunological tolerance manifested in fatal IFNγ-dependent immune-mediated lesions...
The NFKB1 gene encodes two functionally distinct proteins termed p50 and p105. p50 corresponds to the N terminus of p105 and with p65 (RelA) forms the prototypical NF-κB transcription factor complex. In contrast, p105 functions as a Rel-specific inhibitor (IκB) and has been proposed to be the precursor of p50. Our studies now demonstrate that p50 is generated by a unique cotranslational processing...
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