Setd1a regulates progenitor B-cell-to-precursor B-cell development through histone H3 lysine 4 trimethylation and Ig heavy-chain rearrangement.
FASEB J
; 29(4): 1505-15, 2015 Apr.
Article
en En
| MEDLINE
| ID: mdl-25550471
ABSTRACT
SETD1A is a member of trithorax-related histone methyltransferases that methylate lysine 4 at histone H3 (H3K4). We showed previously that Setd1a is required for mesoderm specification and hematopoietic lineage differentiation in vitro. However, it remains unknown whether or not Setd1a controls specific hematopoietic lineage commitment and differentiation during animal development. Here, we reported that homozygous Setd1a knockout (KO) mice are embryonic lethal. Loss of the Setd1a gene in the hematopoietic compartment resulted in a blockage of the progenitor B-cell-to-precursor B-cell development in bone marrow (BM) and B-cell maturation in spleen. The Setd1a-cKO (conditional knockout) mice exhibited an enlarged spleen with disrupted spleen architecture and leukocytopenia. Mechanistically, Setd1a deficiency in BM reduced the levels of H3K4me3 at critical B-cell gene loci, including Pax5 and Rag1/2, which are critical for the IgH (Ig heavy-chain) locus contractions and rearrangement. Subsequently, the differential long-range looped interactions of the enhancer Eµ with proximal 5' DH region and 3' regulatory regions as well as with Pax5-activated intergenic repeat elements and 5' distal VH genes were compromised by the Setd1a-cKO. Together, our findings revealed a critical role of Setd1a and its mediated epigenetic modifications in regulating the IgH rearrangement and B-cell development.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Histonas
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Reordenamiento Génico de Cadena Pesada de Linfocito B
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N-Metiltransferasa de Histona-Lisina
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Células Precursoras de Linfocitos B
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Canales Iónicos
Límite:
Animals
Idioma:
En
Revista:
FASEB J
Asunto de la revista:
BIOLOGIA
/
FISIOLOGIA
Año:
2015
Tipo del documento:
Article