| Sod1 | Superoxide dismutase | Simultaneous overexpression of catalase and Sod (alias Sod1) results in a one-third lifespan extension, a slower rate of mortality acceleration, and a delayed loss in physical performance, but neither has any effect on lifespan alone [8108730]. General overexpression of Sod (also known as Cu/ZnSOD) alone is sufficient to extend lifespan by up to 48%. Simultaneous overexpression of catalase with Cu/ZnSOD has no added benefit, presumably due to a pre-existing excess of catalase [9858546]. Sod1 reduction by knockdown or knockout blunts the lifespan extension by a high sugar-low protein diet, but not a low-calorie diet [22672579].
Sod mutant flies display infertility and a reduction in lifespan [2539600]. | Fruit fly |
| Sir2 | — | Overexpression of Sir2 (alias dSir2) extends lifespan by up to 57% and specifically median lifespan by 40-60%, whereas a decrease in Sir2 activity by mutation blocks the life-extending effect of caloric reduction or rpd3 mutations [15520384]. rpd3 mutants fed normal food and wild-type fed a low-calorie diet increase dSir2 expression two-fold [12459580]. Sir2 mutation does not reduce lifespan under AL. Ubiquitous Sir2 overexpression causes a 4-fold increase in Sir2 mRNA expression and an up to 57% increase in average lifespan (29% for females and 18% for males). A 10 - 20% increase in Sir2 mRNA levels causes no lifespan extension. High levels of Sir2 protein is found in nuclei of neurons and in nuclei and cytoplasm of fat body cells. Neuronal Sir2 overexpression extends average lifespan by 52% in females and 20% in males. Motor-neuronal specific expression fails to cause lifespan extension. Flies with no or with several decreased Sir2 gene function have no lifespan extension under DR. DR fails to cause further increase in lifespan or even reduces lifespan toward normal of Sir2 overexpression mutants. Mild Sir2 overexpression in the fat-body extends lifespan and reduces relative body fat content in both males and females [22661237].
Sir2 in the adult fat body regulates longevity in a diet-depending manner. A diet-dependent lifespan phenotype of Sir2 perturbations (both knockdown and overexpression) in the fat-body, but not in muscles, negates the effects of background genetic mutants. Sir2 knockdown abrogates fat-body dFoxo-dependent lifespan extension [23246004].
Decreased expression of Sir2 and Sir2-like genes in all cells causes lethality during development. Suppression of the Sir2 in neurons decreases the median lifespan by 10-30%, while ubiquitinous silinecing of the Sir2-like genes shortens lifespan. The effects are server at 28°C that at 25°C [17159295]. | Fruit fly |
| Pka-C1 | cAMP-dependent protein kinase 1 | PKA-overexpressing flies (hsPKA*/+) have an about 30% extended maximum lifespan [17369827]. | Fruit fly |
| Pcmt | Protein-L-isoaspartate (D-aspartate) O-methyltransferase | Overexpression of Pcmt extends lifespan by 32-39% at 29 degrees but not at 25 degrees [11742076].
The adult lifespan of animals overexpressing Pcmt is extended [18772467]. | Fruit fly |
| mys | myospheroid | mys mutants exhibit ameliorated age-related declines in locomotor activity and an increase in mean lifespan of 20% [14570233]. | Fruit fly |
| Hsp68 | Heat shock protein 68 | Overexpression of Hsp68 extends modestly (by around 15%) median and maximum lifespan [14602080]. Hsp68 is activated by the JNK pathway and target gene of foxo [20976250].
There is a consistent and significant lifespan extension by 20% in both males and females when hsp68 is overexpressed in somatic cells. hsp68 overexpression using GMR-Gal4, and eye-specific driver that expresses Gal4 in salivary glands has no effects. Hsp78 overexpression using the weaker 5961FS driver moderately but significantly extends lifespan [20976250]. | Fruit fly |
| Hsp27 | Heat shock protein 27 | Overexpression of Hsp27 (by the UAS/GAL4 system) increases stress resistance and extends the mean lifespan by 30% [15308776]. | Fruit fly |
| Hsp26 | Heat shock protein 26 | Overexpression of Hsp26 (by the UAS/GAL4 system) increases stress resistance and extends the mean lifespan by 30% [15308776]. | Fruit fly |
| Gclm | Glutamate-cysteine ligase modifier subunit | Overexpression of Gclm extends the mean lifespan by up to 24% [16148000]. | Fruit fly |
| Gclc | Glutamate-cysteine ligase catalytic subunit | Overexpression of Gclc extends mean and maximum lifespan by up to 50% [16148000]. | Fruit fly |
| foxo | Forkhead box, sub-group O | foxo overexpression extends lifespan. Activation of foxo in the adult pericerbral fat body is sufficient for lifespan extension [15175753]. Overexpression of foxo in the adult adipose tissue alone prolongs lifespan [15192154; 15175753]. Limited activation of foxo reduces the expression of Drosophila insulin-like peptide dilp-2 synthesized in neurons and, represses endogenous insulin-dependent signaling in peripheral fat body [15175753]. foxo is not required for DR, but its activity modulates the response. foxo null mutants are highly and significantly shorter-lived than wild-type on all food dilutions apart from 0.1 SY and under starvation. foxo null mutants are not more sensitive to starvation than wild-type. foxo overexpression in adult fat body under normal nutritional conditions leads to extension of lifespan of females and causes a right shift of the response curve of lifespan to DR [18241326].
Overexpression of dFOXO in adult fat body increases median, by 21-33%, and maximum lifespan as well as lowers the age-specific mortality at all ages, in two independent experiments. Overexpression of dFOXO increases lifespan by lowering the whole mortality trajectory, with no effect on slope (similar to DR). Initiation of dFOXO expression at different ages increases subsequent lifespan with the magnitude of increase decreasing as the animals were put on RU486 (which activates the foxo transgene via UAS) at older ages. The effects of removal of dFOXO overexpression at different ages closely mirrored those of induction of expression and produce shortest lifespan observed in animals taken of RU486 at the earlier ages [17465980].
| Fruit fly |
| Ef1alpha48D | Elongation factor 1alpha48D | Overexpression of Ef1alpha48D (transformed with a P-element vector and under control of hsp70 regulatory sequences) results in lifespan extension by 18-41%. The decrease in protein synthesis that accompanies aging is preceded by a decrease in EF-1 alpha protein and mRNA [2508089]. | Fruit fly |
