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Triplication of a 21q22 region contributes to B cell transformation through HMGN1 overexpression and loss of histone H3 Lys27 trimethylation.

Abstract：

:Down syndrome confers a 20-fold increased risk of B cell acute lymphoblastic leukemia (B-ALL), and polysomy 21 is the most frequent somatic aneuploidy among all B-ALLs. Yet the mechanistic links between chromosome 21 triplication and B-ALL remain undefined. Here we show that germline triplication of only 31 genes orthologous to human chromosome 21q22 confers mouse progenitor B cell self renewal in vitro, maturation defects in vivo and B-ALL with either the BCR-ABL fusion protein or CRLF2 with activated JAK2. Chromosome 21q22 triplication suppresses histone H3 Lys27 trimethylation (H3K27me3) in progenitor B cells and B-ALLs, and 'bivalent' genes with both H3K27me3 and H3K4me3 at their promoters in wild-type progenitor B cells are preferentially overexpressed in triplicated cells. Human B-ALLs with polysomy 21 are distinguished by their overexpression of genes marked with H3K27me3 in multiple cell types. Overexpression of HMGN1, a nucleosome remodeling protein encoded on chromosome 21q22 (refs. 3,4,5), suppresses H3K27me3 and promotes both B cell proliferation in vitro and B-ALL in vivo.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Lane AA,Chapuy B,Lin CY,Tivey T,Li H,Townsend EC,van Bodegom D,Day TA,Wu SC,Liu H,Yoda A,Alexe G,Schinzel AC,Sullivan TJ,Malinge S,Taylor JE,Stegmaier K,Jaffe JD,Bustin M,te Kronnie G,Izraeli S,Harris MH,Steve

doi

10.1038/ng.2949

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

618-23

issue

6

eissn

1061-4036

issn

1546-1718

pii

ng.2949

journal_volume

46

pub_type

杂志文章

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