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2016 ; 61
(6
): 859-73
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SON and Its Alternatively Spliced Isoforms Control MLL Complex-Mediated H3K4me3
and Transcription of Leukemia-Associated Genes
#MMPMID26990989
Kim JH
; Baddoo MC
; Park EY
; Stone JK
; Park H
; Butler TW
; Huang G
; Yan X
; Pauli-Behn F
; Myers RM
; Tan M
; Flemington EK
; Lim ST
; Ahn EY
Mol Cell
2016[Mar]; 61
(6
): 859-73
PMID26990989
show ga
Dysregulation of MLL complex-mediated histone methylation plays a pivotal role in
gene expression associated with diseases, but little is known about cellular
factors modulating MLL complex activity. Here, we report that SON, previously
known as an RNA splicing factor, controls MLL complex-mediated transcriptional
initiation. SON binds to DNA near transcription start sites, interacts with
menin, and inhibits MLL complex assembly, resulting in decreased H3K4me3 and
transcriptional repression. Importantly, alternatively spliced short isoforms of
SON are markedly upregulated in acute myeloid leukemia. The short isoforms
compete with full-length SON for chromatin occupancy but lack the menin-binding
ability, thereby antagonizing full-length SON function in transcriptional
repression while not impairing full-length SON-mediated RNA splicing.
Furthermore, overexpression of a short isoform of SON enhances replating
potential of hematopoietic progenitors. Our findings define SON as a fine-tuner
of the MLL-menin interaction and reveal short SON overexpression as a marker
indicating aberrant transcriptional initiation in leukemia.