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Calorie restriction promotes genome stability in mismatch repair defected cells during aging (LB118)
Author(s) -
Lo YiChen,
Chang JiaChi,
Teong Xiao Tong,
Lo YunJun,
Leow SiewKeng,
Kao ChengFu
Publication year - 2014
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.28.1_supplement.lb118
Subject(s) - msh6 , msh2 , dna mismatch repair , dna damage , calorie restriction , biology , mutant , dna repair , mutation , microbiology and biotechnology , saccharomyces cerevisiae , gene , cancer research , genetics , dna , endocrinology
Mismatch repair is a DNA repair system which is critical for the maintenance of genome stability. Defects in mismatch repair have been linked to colorectal and sporadic cancers. Calorie restriction (CR) has been shown to extend life span in various organisms and reduce tumor incidence in mammals. By using Saccharomyces cerevisiae model system for CR and aging studies, mismatch repair defective cells (msh2Δ, msh3Δ, msh6Δ, msh2Δmsh3Δ, msh2Δmsh6Δ and msh3Δmsh6Δ) were cultured with normal (2% glucose) and CR (0.5% glucose) medium. Here we demonstrate that CR containing 0.5% glucose compared to normal treatment (2.0% glucose) can extend life span and promote HOM3 gene stability in all MMR‐defected cells during aging process in yeast. Although the levels of reactive oxygen species (ROS) were significantly increased during aging and CR dramatically reduce the levels of ROS, the levels of ROS had no positive correlation with HOM3 gene mutation rates by comparing those in wild type cells and MMR‐defected cells. The underlying mechanisms need to be further investigated.