title: A/ASP/VAL allele combination of IGF1R, IRS2, and UCP2 genes is associated with better metabolic profile, preserved energy expenditure parameters, and low mortality rate in longevity.
abstract: A large array of gene involved in human longevity seems to be in relationship with insulin/IGF1 pathway. However, if such genes interact each other, or with other genes, to reduce the age-related metabolic derangement and determine the long-lived phenotype has been poorly investigated. Thus, we tested the role of interchromosomal interactions among IGF1R, IRS2, and UCP2 genes on the probability to reach extreme old age in 722 unrelated Italian subjects (401 women and 321 men; mean age, 62.83 ± 25.30 years) enrolled between 1998 and 1999. In particular, the G/A-IGF1R, Gly/Asp-IRS2, and Ala/Val-UCP2 allele combination was tested for association with longevity, metabolic profile and energy expenditure parameters. The effect on all-cause and cause-specific mortality rate was also assessed after a mean follow-up of 6 years. The analysis revealed that AAV allele combination is associated with a decreased all-cause mortality risk (HR, 0.72; 95% CI, 0.63-0.91; p = 0.03) and with a higher probability to reach the extreme of old age (OR, 3.185; 95% CI, 1.63-6.19; p = 0.0006). The analysis also revealed lower HOMA-IR (Diff, -0.532, 95% CI, 0.886-0.17; p = 0.003), higher respiratory quotient (Diff, 0.0363, 95% CI, 0.014-0.05; p = 0.001), and resting metabolic rate (Diff, 101.80693, 95% CI, -5.26-204.278; p = 0.038) for AAV allele combination. In conclusion, A-IGF1R/Asp-IRS2/Val-UCP2 allele combination is associated with a decreased all-cause mortality risk and with an increased chance of longevity. Such an effect is probably due to the combined effect of IGF1R, IRS2, and UCP2 genes on energy metabolism and on the age-related metabolic remodeling capacity.
authors.affiliation: Department of Geriatric Medicine and Metabolic Diseases, Second University of Naples, Piazza Miraglia 2, 80138, Naples, Italy.
authors.forename: Michelangela
authors.initials: M
authors.lastname: Barbieri
authors.forename: Virginia
authors.initials: V
authors.lastname: Boccardi
authors.forename: Antonietta
authors.initials: A
authors.lastname: Esposito
authors.forename: Michela
authors.initials: M
authors.lastname: Papa
authors.forename: Francesco
authors.initials: F
authors.lastname: Vestini
authors.forename: Maria Rosaria
authors.initials: MR
authors.lastname: Rizzo
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Paolisso
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000235:genetics*; D000465:Algorithms; D000483:Alleles; D004734:Energy Metabolism / Q000235:genetics*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D055504:Insulin Receptor Substrate Proteins / Q000235:genetics*; D007473:Ion Channels / Q000235:genetics*; D008136:Longevity / Q000235:genetics*; D008297:Male; D055442:Metabolome / Q000235:genetics; D008875:Middle Aged; D024101:Mitochondrial Proteins / Q000235:genetics*; D017526:Receptor, IGF Type 1 / Q000235:genetics*; D012189:Retrospective Studies; D016019:Survival Analysis; D000071246:Uncoupling Protein 2
chemical_list: C526297:IRS2 protein, human; D055504:Insulin Receptor Substrate Proteins; D007473:Ion Channels; D024101:Mitochondrial Proteins; C000604389:UCP2 protein, human; D000071246:Uncoupling Protein 2; D017526:Receptor, IGF Type 1