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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 Genes+Dev
2015 ; 29
(20
): 2108-22
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Lhx1 functions together with Otx2, Foxa2, and Ldb1 to govern anterior
mesendoderm, node, and midline development
#MMPMID26494787
Costello I
; Nowotschin S
; Sun X
; Mould AW
; Hadjantonakis AK
; Bikoff EK
; Robertson EJ
Genes Dev
2015[Oct]; 29
(20
): 2108-22
PMID26494787
show ga
Gene regulatory networks controlling functional activities of spatially and
temporally distinct endodermal cell populations in the early mouse embryo remain
ill defined. The T-box transcription factor Eomes, acting downstream from
Nodal/Smad signals, directly activates the LIM domain homeobox transcription
factor Lhx1 in the visceral endoderm. Here we demonstrate Smad4/Eomes-dependent
Lhx1 expression in the epiblast marks the entire definitive endoderm lineage, the
anterior mesendoderm, and midline progenitors. Conditional inactivation of Lhx1
disrupts anterior definitive endoderm development and impedes node and midline
morphogenesis in part due to severe disturbances in visceral endoderm
displacement. Transcriptional profiling and ChIP-seq (chromatin
immunoprecipitation [ChIP] followed by high-throughput sequencing) experiments
identified Lhx1 target genes, including numerous anterior definitive endoderm
markers and components of the Wnt signaling pathway. Interestingly, Lhx1-binding
sites were enriched at enhancers, including the Nodal-proximal epiblast enhancer
element and enhancer regions controlling Otx2 and Foxa2 expression. Moreover, in
proteomic experiments, we characterized a complex comprised of Lhx1, Otx2, and
Foxa2 as well as the chromatin-looping protein Ldb1. These partnerships
cooperatively regulate development of the anterior mesendoderm, node, and midline
cell populations responsible for establishment of the left-right body axis and
head formation.