title: Eccentric localization of catalase to protect chromosomes from oxidative damages during meiotic maturation in mouse oocytes.
abstract: The maintenance of genomic integrity and stability is essential for the survival of every organism. Unfortunately, DNA is vulnerable to attack by a variety of damaging agents. Oxidative stress is a major cause of DNA damage because reactive oxygen species (ROS) are produced as by-products of normal cellular metabolism. Cells have developed eloquent antioxidant defense systems to protect themselves from oxidative damage along with aerobic metabolism. Here, we show that catalase (CAT) is present in mouse oocytes to protect the genome from oxidative damage during meiotic maturation. CAT was expressed in the nucleus to form unique vesicular structures. However, after nuclear envelope breakdown, CAT was redistributed in the cytoplasm with particular focus at the chromosomes. Inhibition of CAT activity increased endogenous ROS levels, but did not perturb meiotic maturation. In addition, CAT inhibition produced chromosomal defects, including chromosome misalignment and DNA damage. Therefore, our data suggest that CAT is required not only to scavenge ROS, but also to protect DNA from oxidative damage during meiotic maturation in mouse oocytes.
authors.affiliation: Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Korea.
authors.forename: Yong Seok
authors.initials: YS
authors.lastname: Park
authors.affiliation: Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Korea.
authors.forename: Seung Yeop
authors.initials: SY
authors.lastname: You
authors.affiliation: Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Korea.
authors.forename: Sungrae
authors.initials: S
authors.lastname: Cho
authors.affiliation: Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Korea.
authors.forename: Hyuk-Joon
authors.initials: HJ
authors.lastname: Jeon
authors.affiliation: Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Korea.
authors.forename: Sukchan
authors.initials: S
authors.lastname: Lee
authors.affiliation: Department of East-West Medical Science, Graduate School of East-West Medical Science, Kyung Hee University, Yongin, South Korea.
authors.forename: Dong-Hyung
authors.initials: DH
authors.lastname: Cho
authors.affiliation: Division of Radiation Cancer Research, Korea Institute of Radiological and Medical Sciences, Seoul, Republic of Korea.
authors.forename: Jae-Sung
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Genetic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 440-746, Korea. ohjs@skku.edu.
authors.forename: Jeong Su
authors.initials: JS
authors.lastname: Oh
mesh_terms: D000818:Animals; D002374:Catalase / Q000378:metabolism*; D002478:Cells, Cultured; D002875:Chromosomes / Q000235:genetics / Q000378:metabolism*; D004249:DNA Damage; D008540:Meiosis; D051379:Mice; D009865:Oocytes / Q000166:cytology* / Q000201:enzymology / Q000378:metabolism*; D018384:Oxidative Stress; D017382:Reactive Oxygen Species / Q000378:metabolism*
chemical_list: D017382:Reactive Oxygen Species; D002374:Catalase
keywords: Antioxidant enzymes; Catalase; DNA damage; Oocyte; Reactive oxygen species