MLL3 is a haploinsufficient 7q tumor suppressor in acute myeloid leukemia.

MLL3 is a haploinsufficient 7q tumor suppressor in acute myeloid leukemia.
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DOI:
10.1016/j.ccr.2014.03.016
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发表时间:
2014-05-12
期刊:
影响因子:
50.3
通讯作者:
Lowe SW
Lowe SW
中科院分区:
医学1区
文献类型:
--
作者:
Chen C;Liu Y;Rappaport AR;Kitzing T;Schultz N;Zhao Z;Shroff AS;Dickins RA;Vakoc CR;Bradner JE;Stock W;LeBeau MM;Shannon KM;Kogan S;Zuber J;Lowe SW

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7号染色体和7 q [−7/del(7 q)]的反复缺失发生在骨髓增生异常综合征和急性髓细胞白血病(AML)中,并与预后不良相关。然而,7 q上功能相关的肿瘤抑制因子的身份仍不清楚。使用RNAi和CRISPR/Cas9方法,我们表明位于7q36.1上的混合谱系白血病3(MLL 3)基因的基因剂量减少约50%,与-7/del(7 q)AMLS中发生的其他事件协同作用,促进白血病发生。MII 3抑制损害HSPC的分化。有趣的是,M113抑制的白血病,像人-7/del(7 q)AML一样,对常规化疗难治,但对BET抑制剂JQ 1敏感。因此,我们的小鼠模型在功能上验证了MLL 3作为单倍不足的7 q肿瘤抑制因子,并提出了这种侵袭性疾病的治疗选择。
Recurring deletions of chromosome 7 and 7q [−7/del(7q)] occur in myelodysplastic syndromes and acute myeloid leukemia (AML) and are associated with poor prognosis. However, the identity of functionally relevant tumor suppressors on 7q remains unclear. Using RNAi and CRISPR/Cas9 approaches, we show that an ~50% reduction in gene dosage of the mixed lineage leukemia 3 (MLL3) gene, located on 7q36.1, cooperates with other events occurring in −7/del(7q) AMLs to promote leukemogenesis. Mll3 suppression impairs the differentiation of HSPC. Interestingly, Mll3-suppressed leukemias, like human −7/del(7q) AMLs, are refractory to conventional chemotherapy but sensitive to the BET inhibitor JQ1. Thus, our mouse model functionally validates MLL3 as a haploinsufficient 7q tumor suppressor and suggests a therapeutic option for this aggressive disease.
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