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O-linked β-N-acetylglucosamine transferase plays an essential role in heart development through regulating angiopoietin-1

ABSTRACT: Using RNA sequencing we compared the transcriptome change between control and OGT knockout heart samples

ORGANISM(S): Mus musculus

PROVIDER: GSE146962 | GEO | 2020/03/14

REPOSITORIES: GEO

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O-linked ?-N-acetylglucosamine transferase plays an essential role in heart development through regulating angiopoietin-1.

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Project description:O-linked N-acetylglucosamine (O-GlcNAc) transferase (OGT) catalyzes post-translational modification of target proteins by introducing O-GlcNAc moiety on serine or threonine residues. OGT critically regulates various cellular functions in many cell types. However, its roles in hematopoietic stem and progenitor cells (HSPCs) are totally unknown. Here we report critical roles of OGT in homeostasis of HSPCs. Ogt is highly expressed in HSPCs and its disruption led to their rapid loss with increased reactive oxygen species and apoptosis. In particular, Ogt-deficient HSCs lost quiescence and showed severe defects in self-renewal and long-term repopulation capacities. Interestingly, Ogt-deficient HSCs accumulated defective mitochondria due to impaired mitophagy with decreased key mitophagy regulators, Pink1 and Bnip3, through dysregulation of host cell factor 1 (HCF1)-H3K4me3 pathway, and overexpression of Pink1 rescued impaired mitophagy and numbers of Ogt-deficient HSCs. In summary, our results revealed that OGT plays an essential role in HSC maintenance by assuring mitochondrial quality through mitophagy.

2020-12-09 | GSE116433 | GEO

O-linked β-N-acetylglucosamine transferase plays an essential role in heart development through regulating angiopoietin-1

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Characterization of a novel mutation in O-GlcNAc transferase that segregates with disease in a family with X-linked intellectual disability

Project description:An X-chromosome exome sequencing analysis identified a mutation in O-GlcNAc transferase (OGT) (pL254F) in a family with X-linked intellectual disability (XLID). Affected patient lymohoblastoids exhibit decreased steady state OGT levels owing to an unstable protein compared to the unaffected, related male controls. Suprisingly, global O-GlcNAc levels remained remained unaltered. This prompted us to check the both protein and mRNA levels of the other cycling enzyme, O-GlcNAcase (OGA) which was also lowered. This implies that a compensation mechanism exists, however imperfect, owing to the disease state of the individuals. We performed glabal transcriptome analysis to assess any other changes in message between patients and controls. Our study highlights small differences in the global transcriptome of patient lymhoblastoids that have the L254F mutation in O-GlcNAc transferase when compared to familial controls using Illumina sequencing of total RNA

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