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A surge of DNA damage links transcriptional reprogramming and hematopoietic deficit in Fanconi anemia

ABSTRACT: A surge of DNA damage links transcriptional reprogramming and hematopoietic deficit in Fanconi anemia

PROVIDER: PRJNA679791 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13091959.fastq.gz	Fastqsanger.gz
	SRR13091960.fastq.gz	Fastqsanger.gz
	SRR13091961.fastq.gz	Fastqsanger.gz
	SRR13091962.fastq.gz	Fastqsanger.gz
	SRR13091963.fastq.gz	Fastqsanger.gz

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A surge of DNA damage links transcriptional reprogramming and hematopoietic deficit in Fanconi anemia

Project description:Impaired DNA crosslink repair leads to Fanconi anemia (FA), characterized by a unique manifestation of bone marrow failure and pancytopenia among diseases caused by DNA damage response defects. As a germline disorder, why the hematopoietic hierarchy is specifically affected is not fully understood. We find that reprogramming transcription during hematopoietic differentiation results in an overload of genotoxic stress, which causes aborted differentiation and depletion of FA mutant progenitor cells. The onset of DNA damage most likely arises from formaldehyde, an obligate by-product of oxidative protein demethylation during transcription regulation. Our results demonstrate that rapid and extensive transcription reprogramming associated with hematopoietic differentiation poses a major threat to genome stability and cell viability in the absence of the FA pathway. The connection between differentiation and DNA damage accumulation reveals a novel mechanism of genome scarring and is critical to exploring therapies to counteract the aplastic anemia for the treatment of FA patients.

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Project description:Fanconi anemia is a rare inherited hematological disorder which commonly presents with bone marrow failure, developmental abnormalities and susceptibility to cancer with high rates of prevalence in ethnic populations. The objective of this study was to identify potential genes that aid in the progression of the disease or produce its principal symptoms and to hypothesize enabling roles for certain genes that are not part of the central molecular machinery causing the disease. A total of 2 Fanconi anemia samples were collected from patients who displayed characteristic FA features. All of them gave positive results for the DNA breakage test after mitomycin C treatment. Samples were referred by Dr. Sheila Mohan of REFAIN (Registry for Fanconi anemia in India). Whole genome microarray analysis of peripheral blood from 2 patient samples and one normal individual. Sequential analysis of microarray data was carried out using gene ontology and pathway analysis to identify candidate genes.

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A Surge of DNA Damage Links Transcriptional Reprogramming and Hematopoietic Deficit in Fanconi Anemia.

Project description:Impaired DNA crosslink repair leads to Fanconi anemia (FA), characterized by a unique manifestation of bone marrow failure and pancytopenia among diseases caused by DNA damage response defects. As a germline disorder, why the hematopoietic hierarchy is specifically affected is not fully understood. We find that reprogramming transcription during hematopoietic differentiation results in an overload of genotoxic stress, which causes aborted differentiation and depletion of FA mutant progenitor cells. DNA damage onset most likely arises from formaldehyde, an obligate by-product of oxidative protein demethylation during transcription regulation. Our results demonstrate that rapid and extensive transcription reprogramming associated with hematopoietic differentiation poses a major threat to genome stability and cell viability in the absence of the FA pathway. The connection between differentiation and DNA damage accumulation reveals a novel mechanism of genome scarring and is critical to exploring therapies to counteract the aplastic anemia for the treatment of FA patients.

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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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