Elevated levels of intracellular ROS through hydrogen peroxide treatment, or deficiency of ROS scavenging enzymes such as superoxide dismutase (SOD1) knockdown, has been shown to induce premature senescence and reduce cellular life span [3], [4], [5].
In keeping with this, it has been recently shown that hydrogen peroxide scavenging rescues frataxin deficiency in a Drosophila model of Friedreich's ataxia [39].
Despite its apparent importance in hydrogen peroxide removal, humans with genetic deficiency of catalase — "acatalasemia" — or mice genetically engineered to lack catalase completely, suffer few ill effects.
The complexes are also essential for survival under a number of stress conditions, including iron deficiency, nitrosative and peroxide stresses, exposure to cyanide, pressure, and high temperatures [ 9, 10].
It was shown that vitamin E present with lipids in the cell membrane inhibits cancer formation by neutralising ROS [ 4] and a direct relationship has been established with vitamin E deficiency and lipid peroxide production [ 27].
In 10 unselected tetrads, which all revealed a regular 2 2 segregation, we observed strict co-segregation of G418 resistance indicating the presence of the gene deletion, respiratory deficiency, and resistance against hydrogen peroxide stress.
As SSB repair is reported to be delayed in Parg-deficient cells after hydrogen peroxide treatment, the SSB lesions may be preferentially converted to DSBs under PARG deficiency after MMS treatment.
Deficiency of erythrocyte catalase causes increased hydrogen peroxide concentration.
Using this system, we characterized control of hydrogen peroxide in various cell systems, such as cells deficient in thioredoxin reductase, sulfhydryl oxidases or subjected to selenium deficiency.
