Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of liver from Csbm/m/Xpa-/- knockout mice to investigate the effect of nucleotide excision repair pathway inactivation


ABSTRACT: Cockayne syndrome (CS) is a photosensitive, DNA repair disorder associated with progeria caused by a defect in the transcription-coupled repair (TCR) subpathway of nucleotide excision repair (NER). Here, complete inactivation of NER in Csbm/m/Xpa-/- mutants causes a phenotype that reliably mimics the human progeroid CS syndrome. Newborn Csbm/m/Xpa-/- mice display attenuated growth, progressive neurological dysfunction, retinal degeneration, cachexia, kyphosis and die before weaning. To investigate whether a disturbance in growth and metabolism could explain the pronounced accelerated organismal deterioration seen in Csbm/m/Xpa-/- mice, we evaluated the liver transcriptome of 15-day old wt, single and double mutant mice (n=4). At this age, the Csbm/m/Xpa-/- pups have not yet become cachectic. Mouse liver transcriptome analysis and several physiological endpoints revealed systemic suppression of the GH/IGF1 somatotroph axis and oxidative metabolism, increased antioxidant responses, hypoglycemia together with hepatic glycogen and fat accumulation. Broad genome-wide parallels between Csbm/m/Xpa-/- and naturally aged mouse liver transcriptomes suggested that these changes are intrinsic to natural aging and the DNA repair-deficient mice. Importantly, wild type (wt) mice exposed to a low dose of chronic genotoxic stress and adult Csbm/m mutant mice recapitulated this response, thereby pointing to a novel link between genome instability and the age-related decline of the somatotroph axis.

ORGANISM(S): Mus musculus

SUBMITTER: Ingrid van der Pluijm 

PROVIDER: E-MEXP-835 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Cockayne syndrome (CS) is a photosensitive, DNA repair disorder associated with progeria that is caused by a defect in the transcription-coupled repair subpathway of nucleotide excision repair (NER). Here, complete inactivation of NER in Csb(m/m)/Xpa(-/-) mutants causes a phenotype that reliably mimics the human progeroid CS syndrome. Newborn Csb(m/m)/Xpa(-/-) mice display attenuated growth, progressive neurological dysfunction, retinal degeneration, cachexia, kyphosis, and die before weaning. M  ...[more]

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