While the t
ransc
riptional machine
ry has been extensively dissected at the molecula
r level, little is known about
regulation of ch
romosomal o
rganization in the th
ree-dimensional space of the nucleus to achieve integ
rated t
ransc
riptional
responses to dive
rse signaling events. He
re, we
repo
rt that ligand induces
rapid inte
rch
romosomal inte
ractions among subsets of est
rogen
recepto
r ![]()
rc=""http://www.sciencedi
rect.com/scidi
rimg/entities/204e.gif"" alt=""g
reek small lette
r alpha"" title=""g
reek small lette
r alpha"" bo
rde
r=""0"">-bound t
ransc
ription units, with a d
ramatic
reo
rganization of nuclea
r te
rrito
ries
requi
ring nuclea
r actin/myosin-I t
ranspo
rt machine
ry, dynein light chain 1 (DLC1), and a specific subset of t
ransc
riptional coactivato
rs and ch
romatin
remodeling complexes. We establish a
requi
rement fo
r the histone lysine demethylase, LSD1, in di
recting specific inte
rch
romosomal inte
raction loci to distinct inte
rch
romatin g
ranules, long thought to be “sto
rage” sites fo
r splicing machine
ry, and demonst
rate that these th
ree-dimensional moto
r-dependent inte
ractions a
re
requi
red to achieve enhanced t
ransc
ription of specific est
rogen-
recepto
r ta
rget genes. These findings
reveal
roles fo
r the modulation of nuclea
r a
rchitectu
re in o
rchest
rating
regulated gene-exp
ression p
rog
rams in the mammalian nucleus.