@article {1301, title = {Genetic variation near IRS1 associates with reduced adiposity and an impaired metabolic profile.}, journal = {Nat Genet}, volume = {43}, year = {2011}, month = {2011 Jun 26}, pages = {753-60}, abstract = {

Genome-wide association studies have identified 32 loci influencing body mass index, but this measure does not distinguish lean from fat mass. To identify adiposity loci, we meta-analyzed associations between \~{}2.5 million SNPs and body fat percentage from 36,626 individuals and followed up the 14 most significant (P < 10(-6)) independent loci in 39,576 individuals. We confirmed a previously established adiposity locus in FTO (P = 3 {\texttimes} 10(-26)) and identified two new loci associated with body fat percentage, one near IRS1 (P = 4 {\texttimes} 10(-11)) and one near SPRY2 (P = 3 {\texttimes} 10(-8)). Both loci contain genes with potential links to adipocyte physiology. Notably, the body-fat-decreasing allele near IRS1 is associated with decreased IRS1 expression and with an impaired metabolic profile, including an increased visceral to subcutaneous fat ratio, insulin resistance, dyslipidemia, risk of diabetes and coronary artery disease and decreased adiponectin levels. Our findings provide new insights into adiposity and insulin resistance.

}, keywords = {Adiponectin, Adiposity, Alleles, Body Fat Distribution, Body Mass Index, Body Weight, Female, Genetic Variation, Genome-Wide Association Study, Humans, Insulin Receptor Substrate Proteins, Intracellular Signaling Peptides and Proteins, Male, Membrane Proteins, Meta-Analysis as Topic, Metabolome, Obesity, Polymorphism, Single Nucleotide, Subcutaneous Fat}, issn = {1546-1718}, doi = {10.1038/ng.866}, author = {Kilpel{\"a}inen, Tuomas O and Zillikens, M Carola and Stan{\v c}{\'a}kov{\'a}, Alena and Finucane, Francis M and Ried, Janina S and Langenberg, Claudia and Zhang, Weihua and Beckmann, Jacques S and Luan, Jian{\textquoteright}an and Vandenput, Liesbeth and Styrkarsdottir, Unnur and Zhou, Yanhua and Smith, Albert Vernon and Zhao, Jing-Hua and Amin, Najaf and Vedantam, Sailaja and Shin, So-Youn and Haritunians, Talin and Fu, Mao and Feitosa, Mary F and Kumari, Meena and Halldorsson, Bjarni V and Tikkanen, Emmi and Mangino, Massimo and Hayward, Caroline and Song, Ci and Arnold, Alice M and Aulchenko, Yurii S and Oostra, Ben A and Campbell, Harry and Cupples, L Adrienne and Davis, Kathryn E and D{\"o}ring, Angela and Eiriksdottir, Gudny and Estrada, Karol and Fern{\'a}ndez-Real, Jos{\'e} Manuel and Garcia, Melissa and Gieger, Christian and Glazer, Nicole L and Guiducci, Candace and Hofman, Albert and Humphries, Steve E and Isomaa, Bo and Jacobs, Leonie C and Jula, Antti and Karasik, David and Karlsson, Magnus K and Khaw, Kay-Tee and Kim, Lauren J and Kivimaki, Mika and Klopp, Norman and Kuhnel, Brigitte and Kuusisto, Johanna and Liu, Yongmei and Ljunggren, Osten and Lorentzon, Mattias and Luben, Robert N and McKnight, Barbara and Mellstr{\"o}m, Dan and Mitchell, Braxton D and Mooser, Vincent and Moreno, Jos{\'e} Maria and M{\"a}nnist{\"o}, Satu and O{\textquoteright}Connell, Jeffery R and Pascoe, Laura and Peltonen, Leena and Peral, Bel{\'e}n and Perola, Markus and Psaty, Bruce M and Salomaa, Veikko and Savage, David B and Semple, Robert K and Skaric-Juric, Tatjana and Sigurdsson, Gunnar and Song, Kijoung S and Spector, Timothy D and Syv{\"a}nen, Ann-Christine and Talmud, Philippa J and Thorleifsson, Gudmar and Thorsteinsdottir, Unnur and Uitterlinden, Andr{\'e} G and van Duijn, Cornelia M and Vidal-Puig, Antonio and Wild, Sarah H and Wright, Alan F and Clegg, Deborah J and Schadt, Eric and Wilson, James F and Rudan, Igor and Ripatti, Samuli and Borecki, Ingrid B and Shuldiner, Alan R and Ingelsson, Erik and Jansson, John-Olov and Kaplan, Robert C and Gudnason, Vilmundur and Harris, Tamara B and Groop, Leif and Kiel, Douglas P and Rivadeneira, Fernando and Walker, Mark and Barroso, In{\^e}s and Vollenweider, Peter and Waeber, G{\'e}rard and Chambers, John C and Kooner, Jaspal S and Soranzo, Nicole and Hirschhorn, Joel N and Stefansson, Kari and Wichmann, H-Erich and Ohlsson, Claes and O{\textquoteright}Rahilly, Stephen and Wareham, Nicholas J and Speliotes, Elizabeth K and Fox, Caroline S and Laakso, Markku and Loos, Ruth J F} } @article {6000, title = {Do changes in circulating biomarkers track with each other and with functional changes in older adults?}, journal = {J Gerontol A Biol Sci Med Sci}, volume = {69}, year = {2014}, month = {2014 Feb}, pages = {174-81}, abstract = {

BACKGROUND: It is unclear if changes in proposed circulating biomarkers of aging are strongly correlated to each other or functional change. We tested if biomarker changes track with each other and with functional measures over 9 years in older adults.

METHODS: Dehydroepiandrosterone sulfate (DHEAS), adiponectin, insulin-like growth factor 1 (IGF-1), IGF binding proteins 1 (IGFBP-1) and 3 (IGFBP-3), interleukin-6 (IL-6), cholesterol, and function (gait speed, grip strength, Modified Mini Mental Status Exam [3MSE] and Digit Symbol Substitution Test [DSST] scores) were measured in 1996-1997 and 2005-2006 in the Cardiovascular Health Study All Stars study (N = 901, mean [standard deviation, SD] age 85.3 [3.6] years in 2005-2006). Adjusted Pearson correlations illustrated if biomarkers tracked together. Multivariable linear regression demonstrated if biomarker changes tracked with functional changes.

RESULTS: Correlations among biomarker changes were mostly <0.2. In models with each biomarker entered separately, a 1-SD increase biomarker change was associated with change in function as follows: grip strength (DHEAS β = 0.61kg, p = .001; IL-6 β = -0.46kg, p = .012; cholesterol men β = 0.79kg, p = .016); gait speed (DHEAS β = 0.02 meters per second, p = .039; IL-6 β = -0.018 meters per second, p = .049); and DSST score (DHEAS women β = 1.46, p = .004; IL-6 β = -0.83, p = .027). When biomarkers were entered in the same model, significant associations remaining were as follows: grip strength (DHEAS β = 0.54kg, p = .005; IL-6 β = -0.43kg, p = .022); 3MSE score (IGF-1 β = 0.96, p = .04; IGFBP-3 β = -1.07, p = .024); and DSST score (DHEAS women β = 1.27, p = .012; IL-6 β = -0.80, p = .04).

CONCLUSION: Changes in biomarkers were poorly correlated, supporting a model of stochastic, independent change across systems. DHEAS and IL-6 tracked most closely with function, illustrating that changes in inflammation and sex steroids may play dominant roles in changes of these functional outcomes.

}, keywords = {Adiponectin, Aged, Aged, 80 and over, Aging, Biomarkers, Cholesterol, Cognition, Cohort Studies, Dehydroepiandrosterone Sulfate, Female, Gait, Hand Strength, Humans, Insulin-Like Growth Factor Binding Protein 1, Insulin-Like Growth Factor Binding Protein 3, Insulin-Like Growth Factor I, Interleukin-6, Male, Neuropsychological Tests, Psychomotor Performance, Time Factors}, issn = {1758-535X}, doi = {10.1093/gerona/glt088}, author = {Sanders, Jason L and Ding, Victoria and Arnold, Alice M and Kaplan, Robert C and Cappola, Anne R and Kizer, Jorge R and Boudreau, Robert M and Cushman, Mary and Newman, Anne B} }