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2017 ; 27
(7
): 1126-1138
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Constrained release of lamina-associated enhancers and genes from the nuclear
envelope during T-cell activation facilitates their association in chromosome
compartments
#MMPMID28424353
Robson MI
; de Las Heras JI
; Czapiewski R
; Sivakumar A
; Kerr ARW
; Schirmer EC
Genome Res
2017[Jul]; 27
(7
): 1126-1138
PMID28424353
show ga
The 3D organization of the genome changes concomitantly with expression changes
during hematopoiesis and immune activation. Studies have focused either on
lamina-associated domains (LADs) or on topologically associated domains (TADs),
defined by preferential local chromatin interactions, and chromosome
compartments, defined as higher-order interactions between TADs sharing
functionally similar states. However, few studies have investigated how these
affect one another. To address this, we mapped LADs using Lamin B1-DamID during
Jurkat T-cell activation, finding significant genome reorganization at the
nuclear periphery dominated by release of loci frequently important for T-cell
function. To assess how these changes at the nuclear periphery influence wider
genome organization, our DamID data sets were contrasted with TADs and
compartments. Features of specific repositioning events were then tested by
fluorescence in situ hybridization during T-cell activation. First, considerable
overlap between TADs and LADs was observed with the TAD repositioning as a unit.
Second, A1 and A2 subcompartments are segregated in 3D space through differences
in proximity to LADs along chromosomes. Third, genes and a putative enhancer in
LADs that were released from the periphery during T-cell activation became
preferentially associated with A2 subcompartments and were constrained to the
relative proximity of the lamina. Thus, lamina associations influence internal
nuclear organization, and changes in LADs during T-cell activation may provide an
important additional mode of gene regulation.