Abstract
Reactive oxygen species (ROS) have been implicated in the teratogenicity of alcohol (ethanol, EtOH). To determine the involvement of embryonic oxidative DNA damage, DNA repair-deficient oxoguanine glycosylase 1 (ogg1) knockout embryos were exposed in culture to EtOH (2 or 4 mg/ml), with or without pretreatment with the free radical spin trap phenylbutylnitrone (PBN) (0.125 mM). Visceral yolk sacs were used to genotype embryos for DNA repair status and gender. EtOH caused a concentration-dependent decrease in anterior neuropore closure (ANPC), somite development, turning, crown–rump length (CRL), yolk sac diameter (YSD) and head length (HL) (p < 0.001) in all 3 ogg1 genotypes. There was a further ogg1 gene dose-dependent decrease from +/+ to −/− embryos in ANPC, somite development, turning, CRL and HL (p < 0.05), and a gene-dependent correlation between HL and ANPC (p < 0.01). Female embryos exhibited lesser ANPC and turning than males (p < 0.05), suggesting underlying gender-dependent target-specific determinants. PBN pretreatment increased ANPC, somite development, turning, CRL, YSD and HL (p < 0.001), although this protection against EtOH was slightly less effective in −/− embryos. Oxidatively damaged DNA determined as 8-oxo-2′-deoxyguanosine (8-oxodGuo), which is repaired by OGG1, was measured in single embryos in vivo after maternal EtOH treatment (4 g/kg i.p). EtOH increased embryonic 8-oxodGuo in an ogg1 gene-dependent fashion, with the highest levels in −/− embryos. These results show that embryonic DNA repair status and gender are determinants of risk. ROS-initiated embryonic DNA oxidation is involved in EtOH embryopathies.
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Abbreviations
- 8-oxodGuo:
-
8-Oxo-2′-deoxyguanosine
- FASD:
-
Fetal alcohol spectrum disorders
- OGG1:
-
Oxoguanine glycosylase 1
- PBN:
-
Alpha-phenyl-N-tert-butylnitrone
- GD:
-
Gestational day
- EtOH:
-
Ethanol
- ROS:
-
Reactive oxygen species
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This research was funded by a grant from the Canadian Institutes of Health Research (CIHR).
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Miller-Pinsler, L., Wells, P.G. Deficient DNA repair exacerbates ethanol-initiated DNA oxidation and embryopathies in ogg1 knockout mice: gender risk and protection by a free radical spin trapping agent. Arch Toxicol 90, 415–425 (2016). https://doi.org/10.1007/s00204-014-1397-1
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DOI: https://doi.org/10.1007/s00204-014-1397-1