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Title: Cell-autonomous progeroid changes in conditional mouse models for repair endonuclease XPG deficiency

Journal Article · · PLoS Genetics
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3];  [4];  [5];  [6];  [1];  [5];  [1];  [7];  [8]
  1. Erasmus University Medical Center, Rotterdam (The Netherlands). Dept. of Genetics.
  2. Erasmus Univ. Medical Center, Rotterdam (The Netherlands). Dept. of Neuroscience.
  3. VU Univ. Medical Center, Amsterdam (The Netherlands). Dept. of Intensive Care.
  4. Uniklinik Balgrist, Zurich (Switzerland)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Sciences Division.
  6. Erasmus University Medical Center, Rotterdam (The Netherlands). Dept. of Genetics
  7. Erasmus University Medical Center, Rotterdam (The Netherlands). Dept. of Genetics and Dept. of Vascular Surgery.
  8. The Scripps Research Institute, San Diego, CA (United States)

As part of the Nucleotide Excision Repair (NER) process, the endonuclease XPG is involved in repair of helix-distorting DNA lesions, but the protein has also been implicated in several other DNA repair systems, complicating genotype-phenotype relationship in XPG patients. Defects in XPG can cause either the cancer-prone condition xeroderma pigmentosum (XP) alone, or XP combined with the severe neurodevelopmental disorder Cockayne Syndrome (CS), or the infantile lethal cerebro-oculo-facio-skeletal (COFS) syndrome, characterized by dramatic growth failure, progressive neurodevelopmental abnormalities and greatly reduced life expectancy. Here, we present a novel (conditional) Xpg-/- mouse model which—in a C57BL6/FVB F1 hybrid genetic background—displays many progeroid features, including cessation of growth, loss of subcutaneous fat, kyphosis, osteoporosis, retinal photoreceptor loss, liver aging, extensive neurodegeneration, and a short lifespan of 4–5 months. We show that deletion of XPG specifically in the liver reproduces the progeroid features in the liver, yet abolishes the effect on growth or lifespan. In addition, specific XPG deletion in neurons and glia of the forebrain creates a progressive neurodegenerative phenotype that shows many characteristics of human XPG deficiency. Our findings therefore exclude that both the liver as well as the neurological phenotype are a secondary consequence of derailment in other cell types, organs or tissues (e.g. vascular abnormalities) and support a cell-autonomous origin caused by the DNA repair defect itself. In addition they allow the dissection of the complex aging process in tissue- and cell-type-specific components. Moreover, our data highlight the critical importance of genetic background in mouse aging studies, establish the Xpg-/- mouse as a valid model for the severe form of human XPG patients and segmental accelerated aging, and strengthen the link between DNA damage and aging.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; National Institute of Health
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1212460
Journal Information:
PLoS Genetics, Vol. 10, Issue 10; ISSN 1553-7404
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (18)

DNA Damage: From Chronic Inflammation to Age-Related Deterioration journal October 2016
Function and Interactions of ERCC1-XPF in DNA Damage Response journal December 2018
The DNA damage response to transcription stress journal September 2019
XPF-ERCC1 protects liver, kidney and blood homeostasis outside the canonical excision repair pathways journal April 2020
DNA damage and transcription stress cause ATP-mediated redesign of metabolism and potentiation of anti-oxidant buffering journal October 2019
Mouse Models to Disentangle the Hallmarks of Human Aging journal September 2018
Spontaneous Incidental Brain Lesions in C57BL/6J Mice journal July 2019
Restricted diet delays accelerated ageing and genomic stress in DNA-repair-deficient mice journal August 2016
DNA damage responses in ageing journal November 2019
Cellular senescence drives age-dependent hepatic steatosis journal June 2017
Hallmarks of progeroid syndromes: lessons from mice and reprogrammed cells journal July 2016
Pathology of Mouse Models of Accelerated Aging journal February 2016
DNA Damage: A Main Determinant of Vascular Aging journal May 2016
Skeletal stem cells and their contribution to skeletal fragility: senescence and rejuvenation journal October 2015
Dietary protection for genes journal August 2016
Senescence explains age- and obesity-related liver steatosis journal October 2017
Experimental Models for Aging and their Potential for Novel Drug Discovery journal November 2018
Exonic Variants in Aging-Related Genes Are Predictive of Phenotypic Aging Status journal December 2019

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