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ChIP-seq of PBX1, PBX2 and LEF1 in wild-type and Pbx1/Pbx2 double-knockout EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

ABSTRACT: ChIP-seq of PBX1, PBX2 and LEF1 in wild-type and Pbx1/Pbx2 double-knockout EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

PROVIDER: PRJEB41392 | ENA |

REPOSITORIES: ENA

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ChIP-seq of PBX1, PBX2 and LEF1 in wild-type and Pbx1/Pbx2 double-knockout EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

Project description:In vertebrates, body axis elongation is fuelled by bipotent neuromesodermal progenitors (NMPs), which support the development of both spinal cord and paraxial mesoderm (PM). WNT signalling sustains both NMP expansion and PM differentiation, but the mechanism by which it distinguishes between these alternative fates is unknown. HOX transcription factors have been historically implicated in axial elongation, with their sequential activation playing a fundamental role in timing PM development. PBX1 and PBX2 are obligate anterior HOX cofactors, and therefore they represent prominent candidates for controlling the distinct response to individual HOX factors. In our work, we have demonstrated that PBX proteins generate the DNA-binding context that allows recruitment of the WNT-effector LEF1, and consequently promote the expression of PM genes. Here, we wanted to identify the chromatin binding pattern of PBX1, PBX2 and LEF1 during the first 48 hours of pre-somitic mesoderm (PSM) in vitro differentiation, by performing chromatin immunoprecipitation followed by deep sequencing (ChIP-seq) at different time-points (EpiSCs, 6 hours, 12 hours, 24 hours, 48 hours). To address the impact of PBX loss on LEF1 recruitment to chromatin, we additionally performed ChIP-seq in wild-type (WT) and Pbx1/Pbx2 double-knockout (Pbx1/2-DKO) EpiSCs differentiated in vitro to PSM at different time-points (EpiSCs, 12 hours, 24 hours, 48 hours).

2021-07-21 | E-MTAB-9775 | biostudies-arrayexpress

ATAC-seq of wild-type, Pbx1/Pbx2 double-knockout and pMsgn1-mut EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

Project description:In vertebrates, body axis elongation is fuelled by bipotent neuromesodermal progenitors (NMPs), which support the development of both spinal cord and paraxial mesoderm (PM). WNT signalling sustains both NMP expansion and PM differentiation, but the mechanism by which it distinguishes between these alternative fates is unknown. HOX transcription factors have been historically implicated in axial elongation, with their sequential activation playing a fundamental role in timing PM development. PBX1 and PBX2 are obligate anterior HOX cofactors, and therefore they represent prominent candidates for controlling the distinct response to individual HOX factors. In our work, we have demonstrated that PBX/HOX complexes establish a permissive chromatin landscape for de novo recruitment of the WNT-effector LEF1 on PM genes, including the master regulator Mesogenin1 (Msgn1). To assess the PBX-dependent changes in chromatin accessibility during PM differentiation, we performed ATAC-seq of wild-type (WT) and Pbx1/Pbx2 double-knockout (Pbx1/2-DKO) EpiSCs differentiated in vitro to pre-somitic mesoderm (PSM) at different time-points (EpiSCs, 6 hours, 12 hours, 24 hours, 36 hours, 48 hours). To assess the direct consequence of PBX/HOX binding on chromatin accessibility, we employed the CRISPR/Cas9 technology to generate lines carrying base-pair substitutions on the Msgn1 promoter (pMsgn1-mut) that abrogate the recruitment of PBX/HOX complexes, and we performed ATAC-seq of pMsgn1-mut EpiSCs differentiated in vitro to PSM at different time-points (12 hours, 24 hours, 36 hours, 48 hours).

2021-07-21 | E-MTAB-9776 | biostudies-arrayexpress

Single-cell RNA-seq of wild-type and Pbx1/Pbx2 double-knockout EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

Project description:In vertebrates, body axis elongation is fuelled by bipotent neuromesodermal progenitors (NMPs), which support the development of both spinal cord and paraxial mesoderm (PM). HOX transcription factors have been historically implicated in axial elongation, with their sequential activation playing a fundamental role in timing PM development. PBX1 and PBX2 are obligate anterior HOX cofactors, and therefore they represent prominent candidates for controlling the distinct response to individual HOX factors. To pinpoint the role of PBX proteins in the development of pre-somitic mesoderm (PSM), wild-type (WT) and Pbx1/Pbx2 double-mutant (Pbx1/2-DKO) EpiSCs were differentiated in vitro to PSM. Single cells from different time-points (WT: EpiSCs, 6 hours, 12 hours, 24 hours, 36 hours, 48 hours; Pbx1/2-DKO: 24 hours, 36 hours, 48 hours) were FACS-sorted into 384-well capture plates, and single-cell RNA-sequencing was performed using MARS-seq (Jaitin D.A. et al., Science, 343, 776-779 (2014)). Two wells were left empty in each plate, as a no-cell control during data analysis.

2021-07-21 | E-MTAB-9774 | biostudies-arrayexpress

RNA-seq of wild-type, Pbx1/Pbx2 double-knockout and pMsgn1-mut EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 24 hours of differentiation.

Project description:In vertebrates, body axis elongation is fuelled by bipotent neuromesodermal progenitors (NMPs), which support the development of both spinal cord and paraxial mesoderm (PM). HOX transcription factors have been historically implicated in axial elongation, with their sequential activation playing a fundamental role in timing PM development. PBX1 and PBX2 are obligate anterior HOX cofactors, and therefore they represent prominent candidates for controlling the distinct response to individual HOX factors. In our work, we have demonstrated that PBX proteins play a fundamental role in promoting the expression of PM genes, including the master regulator Mesogenin1 (Msgn1). To address the role of PBX proteins in PM differentiation, RNA-seq was performed on wild-type (WT) and Pbx1/Pbx2 double-knockout (Pbx1/2-DKO) EpiSCs differentiated in vitro to pre-somitic mesoderm (PSM) at different time-points (12 hours and 24 hours). To establish the direct transcriptional regulation of Msgn1 by PBX/HOX, we employed the CRISPR/Cas9 technology to generate lines carrying base-pair substitutions on the Msgn1 promoter (pMsgn1-mut) that abrogate the recruitment of PBX/HOX complexes, and we performed RNA-seq of pMsgn1-mut EpiSCs differentiated in vitro to PSM at 24 hours. All differentiation experiments were performed in biological triplicates with WT and Pbx1/2-DKO lines, and in biological duplicates with pMsgn1-mut lines.

2021-07-21 | E-MTAB-9773 | biostudies-arrayexpress

Single-cell RNA-seq of tailbuds from control, Pbx1/Pbx2 compound and Pbx1/Pbx2 double-knockout E8.5/E9.0 embryos.

Project description:In vertebrates, body axis elongation is fuelled by bipotent neuromesodermal progenitors (NMPs), which support the development of both spinal cord and paraxial mesoderm (PM). NMPs reside in the caudal lateral epiblast and tailbud, from where they sustain axial elongation. HOX transcription factors have been historically implicated in axial elongation, with their sequential activation playing a fundamental role in timing PM development. PBX1 and PBX2 are obligate anterior HOX cofactors, and therefore they represent prominent candidates for controlling the distinct response to individual HOX factors. To pinpoint the role of PBX proteins in the development of pre-somitic mesoderm, single-cell RNA sequencing (scRNA-seq) was performed on cells isolated from the tailbuds of control, Pbx1/Pbx2 compound (Pbx1/2-com) and Pbx1/Pbx2 double-mutant (Pbx1/2-DKO) embryos at embryonic days 8.5 and 9.0. Single cells from at least three embryos per genotype and stage were FACS-sorted into 384-well capture plates, and scRNA-seq was performed using MARS-seq (Jaitin D.A. et al., Science, 343, 776-779 (2014)). As a spike-in internal control for batch-effect correction, 71 EpiSCs cultivated in vitro were sorted into each plate, together with 311 cells from embryonic tailbuds. Two wells were left empty in each plate, as a no-cell control during data analysis.

2021-07-21 | E-MTAB-9785 | biostudies-arrayexpress

RNA-seq of wild-type, Pbx1/Pbx2 double-knockout and pMsgn1-mut EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 24 hours of differentiation.

Project description:RNA-seq of wild-type, Pbx1/Pbx2 double-knockout and pMsgn1-mut EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 24 hours of differentiation.

| PRJEB41389 | ENA

ATAC-seq of wild-type, Pbx1/Pbx2 double-knockout and pMsgn1-mut EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

Project description:ATAC-seq of wild-type, Pbx1/Pbx2 double-knockout and pMsgn1-mut EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

| PRJEB41390 | ENA

Single-cell RNA-seq of wild-type and Pbx1/Pbx2 double-knockout EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

Project description:Single-cell RNA-seq of wild-type and Pbx1/Pbx2 double-knockout EpiSCs differentiated in vitro to pre-somitic mesoderm in the first 48 hours of differentiation.

| PRJEB41794 | ENA

Single-cell RNA-seq of tailbuds from control, Pbx1/Pbx2 compound and Pbx1/Pbx2 double-knockout E8.5/E9.0 embryos.

Project description:Single-cell RNA-seq of tailbuds from control, Pbx1/Pbx2 compound and Pbx1/Pbx2 double-knockout E8.5/E9.0 embryos.

| PRJEB41788 | ENA

Genome-wide distribution of Pbx1/2/3 in mouse cortex at embryonic day 15.5 [ChIP-seq]

Project description:We demonstrate using conditional mutagenesis that Pbx1, with and without Pbx2+/ sensitization, regulates regional identity and laminar patterning of the developing mouse neocortex in cortical progenitors (Emx1-Cre) and in newly generated neurons (Nex1-Cre). Pbx1/2 mutants have three salient molecular phenotypes of cortical regional and laminar organization: hypoplasia of the frontal cortex, ventral expansion of the dorsomedial cortex, and ventral expansion of Reelin expression in the cortical plate of the frontal cortex, concomitant with an inversion of cortical layering in the rostral cortex. Molecular analyses, including PBX ChIP-seq, provide evidence that PBX promotes frontal cortex identity by repressing genes that promote dorsocaudal fate.

2016-03-12 | GSE79152 | GEO

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