Abstract:
:The genetic elements required to tune gene expression are partitioned in active and repressive nuclear condensates. Chromatin compartments include transcriptional clusters whose dynamic establishment and functioning depend on multivalent interactions occurring among transcription factors, cofactors and basal transcriptional machinery. However, how chromatin players contribute to the assembly of transcriptional condensates is poorly understood. By interrogating the effect of KMT2D (also known as MLL4) haploinsufficiency in Kabuki syndrome, we found that mixed lineage leukemia 4 (MLL4) contributes to the assembly of transcriptional condensates through liquid-liquid phase separation. MLL4 loss of function impaired Polycomb-dependent chromatin compartmentalization, altering the nuclear architecture. By releasing the nuclear mechanical stress through inhibition of the mechanosensor ATR, we re-established the mechanosignaling of mesenchymal stem cells and their commitment towards chondrocytes both in vitro and in vivo. This study supports the notion that, in Kabuki syndrome, the haploinsufficiency of MLL4 causes an altered functional partitioning of chromatin, which determines the architecture and mechanical properties of the nucleus.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Fasciani A,D'Annunzio S,Poli V,Fagnocchi L,Beyes S,Michelatti D,Corazza F,Antonelli L,Gregoretti F,Oliva G,Belli R,Peroni D,Domenici E,Zambrano S,Intartaglia D,Settembre C,Conte I,Testi C,Vergyris P,Ruocco G,Zippodoi
10.1038/s41588-020-00724-8subject
Has Abstractpub_date
2020-12-01 00:00:00pages
1397-1411issue
12eissn
1061-4036issn
1546-1718pii
10.1038/s41588-020-00724-8journal_volume
52pub_type
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