Abstract:
:Chromatin looping allows enhancer-bound regulatory factors to influence transcription. Large domains, referred to as topologically associated domains, participate in genome organization. However, the mechanisms underlining interactions within these domains, which control gene expression, are not fully understood. Here we report that activation of embryonic myogenesis is associated with establishment of long-range chromatin interactions centered on Pax3-bound loci. Using mass spectrometry and genomic studies, we identify the ubiquitously expressed LIM-domain binding protein 1 (Ldb1) as the mediator of looping interactions at a subset of Pax3 binding sites. Ldb1 is recruited to Pax3-bound elements independently of CTCF-Cohesin, and is necessary for efficient deposition of H3K4me1 at these sites and chromatin looping. When Ldb1 is deleted in Pax3-expressing cells in vivo, specification of migratory myogenic progenitors is severely impaired. These results highlight Ldb1 requirement for Pax3 myogenic activity and demonstrate how transcription factors can promote formation of sub-topologically associated domain interactions involved in lineage specification.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Magli A,Baik J,Pota P,Cordero CO,Kwak IY,Garry DJ,Love PE,Dynlacht BD,Perlingeiro RCRdoi
10.1038/s41467-019-10318-6subject
Has Abstractpub_date
2019-05-24 00:00:00pages
2316issue
1issn
2041-1723pii
10.1038/s41467-019-10318-6journal_volume
10pub_type
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