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2015 ; 29
(3
): 308-21
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gab.com Text
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English Wikipedia
PRDM16 enhances nuclear receptor-dependent transcription of the brown
fat-specific Ucp1 gene through interactions with Mediator subunit MED1
#MMPMID25644605
Iida S
; Chen W
; Nakadai T
; Ohkuma Y
; Roeder RG
Genes Dev
2015[Feb]; 29
(3
): 308-21
PMID25644605
show ga
PR domain-containing 16 (PRDM16) induces expression of brown fat-specific genes
in brown and beige adipocytes, although the underlying transcription-related
mechanisms remain largely unknown. Here, in vitro studies show that PRDM16,
through its zinc finger domains, directly interacts with the MED1 subunit of the
Mediator complex, is recruited to the enhancer of the brown fat-specific
uncoupling protein 1 (Ucp1) gene through this interaction, and enhances thyroid
hormone receptor (TR)-driven transcription in a biochemically defined system in a
Mediator-dependent manner, thus providing a direct link to the general
transcription machinery. Complementary cell-based studies show that upon
forskolin treatment, PRDM16 induces Ucp1 expression in undifferentiated murine
embryonic fibroblasts, that this induction depends on MED1 and TR, and,
consistent with a direct effect, that PRDM16 is recruited to the Ucp1 enhancer.
Related studies have defined MED1 and PRDM16 interaction domains important for
Ucp1 versus Ppargc1a induction by PRDM16. These results reveal novel mechanisms
for PRDM16 function through the Mediator complex.