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Whole exome sequencing of skin or bone marrow biopsies in Fanconi anemia patients

ABSTRACT: Whole exome sequencing of skin or bone marrow biopsies in Fanconi anemia patients

PROVIDER: PRJEB44179 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR5684060_1.fastq.gz	Fastqsanger.gz
	ERR5684060_2.fastq.gz	Fastqsanger.gz
	ERR5684070_1.fastq.gz	Fastqsanger.gz
	ERR5684070_2.fastq.gz	Fastqsanger.gz
	ERR5684061_1.fastq.gz	Fastqsanger.gz

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Project description:Fanconi anemia (FA) is a rare inherited disease complicated by aplastic anemia. There is evidence that hematopoietic stem cells have lost self replicative capacity and undergo apoptosis when exposed to inhibitory cytokines including interferon gamma and tumor necrosis factor-alpha. We used gene expression microarrays to identify transcriptomal differences between bone marrow cells from normal volunteers and from children and adults with Fanconi anemia Experiment Overall Design: Fanconi anemia patients were identified using mitomycin C and/or diepoxybutane chromosomal breakage analysis. Eleven normal volunteers and 21 FA patients were studied. All FA patients with cytogenetic evidence of clonal evolution were excluded. All FA patients with acute leukemia were excluded. RNA was prepared from freshly obtained low density mononuclear cell fractions.

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Project description:MYC Promotes Bone Marrow Stem Cell Dysfunction in Fanconi Anemia

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MYC Promotes Bone Marrow Stem Cell Dysfunction in Fanconi Anemia

Project description:We profiled primary HSPCs from Fanconi anemia (FA) patients for single cell transcriptome (scRNA-seq) to identify additional determinants of HSPC impairment leading to the bone marrow failure,. Trajectory analysis revealed that early hematopoietic differentiation potential is preserved in FA HSPCs. As expected, p53 and TGFβ pathway genes were overexpressed in HSPCs from FA patients. The oncogene MYC was also identified as one of the top over-expressed genes in FA HSPCs. Interestingly, we observed co-existence of “High-TP53” expressing HSPCs and HighMYC expressing HSPCs in FA bone marrow. Inhibition of MYC expression by the BET bromodomain inhibitor (+)-JQ1 reduced the clonogenic potential of primary HSPCs from FA patients but rescued the physiological/genotoxic stress in HSPCs from FA mice. The “High-MYC” expressing HSPCs exhibited a significant downregulation of cell adhesion genes, such as CXCR4. Consistently, HSPCs in FA patients showed a defect in adhesion to their bone marrow niche resulting in egression from the bone marrow into peripheral blood. We speculate that MYC overexpression impairs HSPC function and contributes to exhaustion of HSPCs in FA bone marrow.

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In Fanconi Anemia, impaired accumulation of bone marrow neutrophils during emergency granulopoiesis induces hematopoietic stem cell stress

Project description:Fanconi Anemia (FA) is an inherited disorder of DNA-repair caused by mutation in one of 20+ interrelated genes that repair intra-strand DNA crosslinks and rescue collapsed or stalled replication forks. The most common hematologic abnormality in FA is anemia, but progression to bone marrow failure (BMF), clonal hematopoiesis, or acute myeloid leukemia (AML) may also occur. In prior studies, we found that Fanconi DNA-repair is required for successful emergency granulopoiesis; the process for rapid neutrophil production during the innate immune response. Specifically, Fancc-/- mice did not develop neutrophilia in response to emergency granulopoiesis stimuli, but instead exhibited apoptosis of bone marrow hematopoietic stem cells (HSCs) and differentiating neutrophils. Repeated emergency granulopoiesis challenges induced BMF in most Fancc-/- mice, with AML in survivors. In contrast, we found equivalent emergency granulopoiesis-induced neutrophilia in Fancc-/-Tp53+/- mice and wild type (WT) mice, without BMF in either. Since bone marrow neutrophil accumulation triggers termination of emergency granulopoiesis, we hypothesize neutrophilia protects Fancc-/-Tp53+/- bone marrow from the stress of sustained inflammatory physiology, as experienced by Fancc-/- mice.

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