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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Curr+Opin+Hematol
2017 ; 24
(4
): 322-328
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Distinct functions of histone H3, lysine 4 methyltransferases in normal and
malignant hematopoiesis
#MMPMID28375985
Yang W
; Ernst P
Curr Opin Hematol
2017[Jul]; 24
(4
): 322-328
PMID28375985
show ga
PURPOSE OF REVIEW: Histone H3, lysine 4 (H3K4) methylation is one chromatin
modification that defines distinct regulatory states of euchromatin. Mammals
express six main histone methyltransferase (HMT) enzymes that modify H3K4 by
monomethylation, dimethylation or trimethylation. Recent studies examine roles of
some of these HMTs and their cofactors in hematopoiesis and leukemia. We discuss
these emerging studies together with prior embryonic stem data, revealing how
these enzymes function. RECENT FINDINGS: Murine models have been employed to
conditionally or constitutively knockout HMTs (MLL1/KMT2A, MLL2/KMT2B,
MLL3/KMT2C, MLL4/KMT2D, SETD1A/KMT2F and SETD1B/KMT2G) as well as specific
domains or partners of these enzymes in normal hematopoietic populations and in
the context of hematologic malignancies. These studies demonstrate that global or
gene-specific changes in H3K4 modification levels can be attributed to particular
enzymes in particular tissues. SUMMARY: Loss-of-function studies indicate largely
nonoverlapping roles of the six H3K4 HMTs. These roles are not all necessarily
due to differences in enzymatic activity and are not always accompanied by large
global changes in histone modification. Both gain-of-function and
loss-of-function mutations in hematologic malignancy are restricted to MLL1 and
MLL3/MLL4, but emerging data indicate that SETD1A/SETD1B and MLL2 can be critical
in leukemia as well.