SINGLE NUCLEOTIDE POLYMORPHISMS AND OBESITY. By: Molly DePrenger & Kirstie Ducharme-Smith
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1 SINGLE NUCLEOTIDE POLYMORPHISMS AND OBESITY By: Molly DePrenger & Kirstie Ducharme-Smith
2 OUTLINE Objectives Introduction Trait of Interest Obesity related genes FTO, ghrelin, impaired brain food-cue responsivity Dietary manipulation POUNDS LOST trial
3 OBJECTIVES 1. To understand the meaning of single nucleotide polymorphism (SNP) 2. To recognize major pathways involved in energy intake (homeostatic, hedonic, frontal executive) 3. To recognize common obesity related genes (FTO) 4. To understand the interaction between FTO and major pathways involved in energy intake 5. To explore effect of food choice (protein) on FTO
4 INTRODUCTION National Human Genome Research Institute.. What Is a Chromosome? Accessed 8 June Web. 25 Feb
5 INTRODUCTION National Human Genome Research Institute.. What Is a Chromosome? Accessed 8 June Web. 25 Feb
6 INTRODUCTION National Human Genome Research Institute.. What Is a Chromosome? Accessed 8 June Web. 25 Feb
7 INTRODUCTION National Human Genome Research Institute.. What Is a Chromosome? Accessed 8 June Web. 25 Feb
8 INTRODUCTION Single nucleotide polymorphisms Sherry,S.T., Ward,M. and Sirotkin,K. (1999) dbsnp Database for Single Nucleotide Polymorphisms and Other Classes of Minor Genetic Variation. Genome Res., 9, andme. What are SNPs? Accessed January 5, Web. 25 Feb. 2015
9 SINGLE NUCLEOTIDE POLYMORPHISMS Genetic Science Learning Center. Making SNPs Make Sense. Learning. Genetics. Accessed January 5, 2015.
10 LOCATING SNPS WITHIN THE GENOME Genetic Science Learning Center. Making SNPs Make Sense. Learning. Genetics. Accessed January 5, 2015.
11 IMPLICATIONS Variations in the DNA sequences can affect how humans develop diseases and respond to pathogens, drugs, vaccines, and other agents GWAS (Genome Wide Association Studies) Examine genetic variants in individuals and associations with traits Typically traits as major diseases If one type of the variant (allele) is more frequent in people with the disease, the SNP is thought to be associated with the disease National Human Genome Research Institute.. What Is a Chromosome? Accessed 8 June Web. 25 Feb
12 TRAIT OF INTEREST Obesity- disorder involving excessive body fat Mayo Clinic. Diseases and Conditions: Obesity. Accessed January 5, Centers for Disease Control. Overweight and Obesity. Accessed January 5, 2015.
13 CLASSIFICATION OF OBESITY Centers for Disease Control. Body Mass Index. Accessed January 5, 2015.
14 CLASSIFICATION OF OBESITY Centers for Disease Control. Body Mass Index. Accessed January 5, 2015.
15 CAUSES OF OBESITY National Institutes of Health. National Heart, Lung, and Blood Institute. What Causes Overweight and Obesity? Accessed January 5, Obesity in Children. Causes of Obesity in Children. Accessed January 5, 2015.
16 CAUSES OF OBESITY National Institutes of Health. National Heart, Lung, and Blood Institute. What Causes Overweight and Obesity? Accessed January 5, Obesity in Children. Causes of Obesity in Children. Accessed January 5, 2015.
17 ENERGY BALANCE E in -E out = ΔBody Weight My Daily Intake. Daily Intake Guide. Healthy Eating Made Easy. Accessed January 5, Body Recomposition. The Energy Balance Equation. Accessed January 5, 2015.
18 SYSTEMS REGULATING ENERGY INTAKE Homeostatic (energy-based) system Hedonic (reward-based) circuit Frontal executive system Lutter M, Nestler EJ. Homeostatic and hedonic signals interact in the regulation of food intake. J Nutr 2009;139: Saper CB, Chou TC, Elmquist JK. The need to feed: homeostatic and hedonic control of eating. Neuron 2002;36:
19 Homeostatic Energy-Based System Lutter M, Nestler EJ. Homeostatic and hedonic signals interact in the regulation of food intake. J Nutr 2009;139: Saper CB, Chou TC, Elmquist JK. The need to feed: homeostatic and hedonic control of eating. Neuron 2002;36: Lustig RH. Childhood obesity: behavioral aberration or biochemical drive? Reinterpreting the First Law of Thermodynamics. Nat Clin Pract Endocrinol Metab 2006;2:
20 ARCUATE NUCLEUS Lutter M, Nestler EJ. Homeostatic and hedonic signals interact in the regulation of food intake. J Nutr 2009;139: Saper CB, Chou TC, Elmquist JK. The need to feed: homeostatic and hedonic control of eating. Neuron 2002;36: Lustig RH. Childhood obesity: behavioral aberration or biochemical drive? Reinterpreting the First Law of Thermodynamics. Nat Clin Pract Endocrinol Metab 2006;2:
21 Hedonic Reward System Lutter M, Nestler EJ. Homeostatic and hedonic signals interact in the regulation of food intake. J Nutr 2009;139: Saper CB, Chou TC, Elmquist JK. The need to feed: homeostatic and hedonic control of eating. Neuron 2002;36: Lustig RH. Childhood obesity: behavioral aberration or biochemical drive? Reinterpreting the First Law of Thermodynamics. Nat Clin Pract Endocrinol Metab 2006;2:
22 FRONTAL EXECUTIVE SYSTEM Lutter M, Nestler EJ. Homeostatic and hedonic signals interact in the regulation of food intake. J Nutr 2009;139: Saper CB, Chou TC, Elmquist JK. The need to feed: homeostatic and hedonic control of eating. Neuron 2002;36: Beck, M. (2010, July 13). Eating to Live or Living to Eat? Wall Street Journal. Accessed January 5, 2015.
23 Obesity- A Lack of Willpower Do you agree?
24 OBESITY RELATED GENES Genes Vary in size from a few hundred DNA bases to more than 2 million bases The National Health Museum. Genes. Accessed January 5, Genetics Home Reference. What is a gene? Accessed January 5, 2015.
25 OBESITY RELATED GENES-PREVALENCE Obesity Related Genes FTO Codes for Alpha-ketoglutaratedependent dioxygenase PCSK1 Prohormone convertase 1/3 hormone Site of SNP rs rs rs6232 rs6235 MC4R Melacortin 4 receptor rs rs CTNNBL1 Beta-catenin-like protein 1 rs rs POMC Pro-opiomelanocortin rs rs rs BDNF Brain derived neurotrophic factor rs6265 Sherry,S.T., Ward,M. and Sirotkin,K. (1999) dbsnp Database for Single Nucleotide Polymorphisms and Other Classes of Minor Genetic Variation. Genome Res., 9, Qi L, Kang K, Zhang C, van Dam RM, Kraft P, Hunter D, Lee CH, Hu FB. Fat mass-and obesity-associated (FTO) gene variant is associated with obesity: longitudinal analyses in two cohort studies and functional test. Diabetes 2008;57: Genetics Home Reference. Genes. FTO. Accessed January 5, 2015.
26 OBESITY RELATED GENES-PREVALENCE Obesity Related Genes FTO Codes for Alpha-ketoglutaratedependent dioxygenase PCSK1 Prohormone convertase 1/3 hormone Site of SNP rs rs rs6232 rs6235 MC4R Melacortin 4 receptor rs rs CTNNBL1 Beta-catenin-like protein 1 rs rs POMC Pro-opiomelanocortin rs rs rs BDNF Brain derived neurotrophic factor rs6265 Sherry,S.T., Ward,M. and Sirotkin,K. (1999) dbsnp Database for Single Nucleotide Polymorphisms and Other Classes of Minor Genetic Variation. Genome Res., 9, Qi L, Kang K, Zhang C, van Dam RM, Kraft P, Hunter D, Lee CH, Hu FB. Fat mass-and obesity-associated (FTO) gene variant is associated with obesity: longitudinal analyses in two cohort studies and functional test. Diabetes 2008;57: Genetics Home Reference. Genes. FTO. Accessed January 5, 2015.
27 FTO GENE Cheung MK, Yeo GS. FTO Biology and Obesity: Why Do a Billion of Us Weigh 3 kg More? Front Endocrinol (Lausanne) 2011;2:4.
28 FTO GENE- EXPRESSION Cheung MK, Yeo GS. FTO Biology and Obesity: Why Do a Billion of Us Weigh 3 kg More? Front Endocrinol (Lausanne) 2011;2:4.
29 Dibble CC, Manning BD. Signal integration by mtorc1 coordinates nutrient input with biosynthetic output. Nat Cell Biol 2013;15: Loos RJ, Yeo GS. The bigger picture of FTO: the first GWAS-identified obesity gene. Nat Rev Endocrinol 2014;10: FTO GENE Contributes to the regulation of the global metabolic rate, energy expenditure and energy homeostasis
30 Dibble CC, Manning BD. Signal integration by mtorc1 coordinates nutrient input with biosynthetic output. Nat Cell Biol 2013;15: Loos RJ, Yeo GS. The bigger picture of FTO: the first GWAS-identified obesity gene. Nat Rev Endocrinol 2014;10: Fischer, Julia. "Inactivation of the FTO Gene Protects from Obesity." International Weekly Journal of Science. Nature, 22 Feb Web. 25 Feb FTO GENE- MTOR PATHWAY Amino Acids Amino Acids
31 FTO GENE Alphaglutarate-dependent dioxygenase Cheung MK, Yeo GS. FTO Biology and Obesity: Why Do a Billion of Us Weigh 3 kg More? Front Endocrinol (Lausanne) 2011;2:4.
32 FTO GENE-RS SNP A allele=high risk T allele=low risk Heterozygous AT Homozygous TT, AA Cheung MK, Yeo GS. FTO Biology and Obesity: Why Do a Billion of Us Weigh 3 kg More? Front Endocrinol (Lausanne) 2011;2:4. National Human Genome Research Institute.. What Is a Chromosome? Accessed 8 June Web. 25 Feb
33 FTO-ASSOCIATED WITH BODY WEIGHT Each A allele associated with mean BMI increase of 0.36 kg/m 2 AA weigh ~3 kg more, AT weigh ~1.5 kg more than TT individuals Frayling TM. Timpson NJ. A Common Variant in the FTO Gene is Associated with Body Mass Index and Predisposes to Childhood and Adult Obesity. Science. (2007)
34 LINK BETWEEN FTO, GHRELIN, AND IMPAIRED BRAIN FOOD-CUE RESPONSIVITY Karra et al. Karra E, O'Daly OG, Choudhury AI, Yousseif A, Millership S, Neary MT, Scott WR, Chandarana K, Manning S, Hess ME, et al. A link between FTO, ghrelin, and impaired brain food-cue responsivity. J Clin Invest 2013;123:
35 STUDY PURPOSE Determine the mechanisms responsible for increased energy intake in those with an FTO genotype associated with obesity (rs aa) AA= High Risk TT= Low Risk
36 OBJECTIVES Assess appetite and circulating acyl-ghrelin levels in AA vs. TT FTO genotypes Determine the appetite response and hedonic food susceptibility in AA vs. TT FTO genotypes and assess impact of dysregulated circulating acyl-ghrelin on these neural circuits
37 GHRELIN AND ACYL GHRELIN Ghrelin is orexigenic hormone Acyl ghrelin is active form of ghrelin and has the greatest orexigenic effects of all forms of ghrelin. Breakfast Lunch Dinner Cummings DE, Purnell JQ, Frayo RS, Schmidova K, Wisse BE, Weigle DS. Diabetes 2001;50: Cummings DE, Weigle DS, Frayo RS, Breen PA, Ma MK, Dellinger EP, Purnell JQ.. N Engl J Med 2002;346: Sharifi F, Yamini M, Esmaeilzadeh A, Mousavinasab N, Shajari Z. J Diabetes Metab Disord 2013;12:51,
38 Homeostatic Energy-Based System
39 APPETITE AND CIRCULATING GHRELIN 10 AA and 10 TT fasted subjects consumed a standard test meal and completed blood samples and appetite analysis for 3 hours post-prandially
40 APPETITE AND CIRCULATING GHRELIN Appetite measured pre- and post-prandially using 100 mm visual analogue scale (VAS) measuring hunger Visual Analog Scale (VAS) Hunger No hunger Extremely hungry Blood work measured circulating PYY3-36 and leptin (satiety hormones) and acyl-ghrelin (orexigenic hormone)
41 FIGURE 1. AUC HUNGER REDUCTION Hunger reduced less in AA than TT subjects (TT = 9671 ± 566, AA = 6957 ± 641, P = 0.003)
42 FIGURE 2. AUC ACYL GHRELIN REDUCTION (PG/L X MIN) No difference in fasting acyl-ghrelin concentrations between AA and TT Less post-prandial suppression of acylghrelin in AA subjects (TT = ± 1408, AA = 9439 ± 1291, P=0.002)
43 CONCLUSION: HOMEOSTATIC SYSTEM Subjects with AA genotype had weaker appetite suppression than TT genotype when fed the same meal Subjects with AA genotype also had weaker suppression of circulating acyl-ghrelin than TT genotype following consumption of the same meal
44 Hedonic Reward System
45 NEURAL RESPONSE TO FOOD
46 Hedonic Reward System vs.
47 FIGURE 3. APPEAL OF HIGH CALORIE IMAGES) High calorie foods significantly more appealing to AA than TT (p<0.05)
48 FIGURE 4. HIGH CALORIE VS. LOW CALORIE IMAGE BOLD RESPONSE
49 FIGURE 5: BOLD RESPONSE IN HEDONIC SYSTEM VS. POST-PRANDIAL ACYL-GHRELIN SUPPRESSION
50 CONCLUSIONS High calorie food more appealing to high risk subjects Attenuated suppression of hunger and acylghrelin in high risk subjects Differing neural responses to hedonic food cues, circulating acyl-ghrelin
51 DISCUSSION QUESTIONS Does this information entice you to get your genomes mapped? Would you recommend a patient to map their genes? Would you utilize a different approach in weight loss counseling for patients with the AA genotype?
52 DIETARY INTERVENTION IN OBESITY RELATED SNPS
53 POUNDS LOST TRIAL 742 overweight or obese participants assigned to one of four hypocaloric diets for 2 years Subjects genotyped for FTO variant rs AA=high risk TT=low risk Low Fat (20%) High Fat (40%) Low Protein (15%) High Protein (25%) Fat: 20% Protein: 15% CHO: 65% Fat: 20% Protein: 25% CHO: 55% Fat: 40% Protein: 15% CHO: 45% Fat: 40% Protein: 25% CHO: 35% Sacks FM, Bray GA, Carey VJ, Smith SR, Ryan DH, Anton SD, McManus K, Champagne CM, Bishop LM, Laranjo N, et al. Comparison of weight-loss diets with different compositions of fat, protein, and carbohydrates. N Engl J Med 2009;360: Zhang X, Qi Q, Zhang C, Smith SR, Hu FB, Sacks FM, Bray GA, Qi L. FTO genotype and 2-year change in body composition and fat distribution in response to weight-loss diets: the POUNDS LOST Trial. Diabetes 2012;61:
54 POUNDS LOST RESULTS High protein diet associated with kg weight loss per A allele (p=0.010) at 2 years Low protein diet associated with increase in total adipose tissue mass (+2.11 kg, p=0.001), increased superficial adipose tissue mass (+1.46 kg, p=0.0004) per A allele at 2 years Zhang X, Qi Q, Zhang C, Smith SR, Hu FB, Sacks FM, Bray GA, Qi L. FTO genotype and 2-year change in body composition and fat distribution in response to weight-loss diets: the POUNDS LOST Trial. Diabetes 2012;61:
55 DECREASE IN FAT MASS PERCENTAGE (N=224) Significant decrease in fat mass percentage in high protein group Zhang X, Qi Q, Zhang C, Smith SR, Hu FB, Sacks FM, Bray GA, Qi L. FTO genotype and 2-year change in body composition and fat distribution in response to weight-loss diets: the POUNDS LOST Trial. Diabetes 2012;61:
56 CONCLUSION: POUNDS LOST High protein diet associated with weight loss, decrease in fat mass % in AA (high risk) allele at 2 years in POUNDS LOST trial Mixed results of association between FTO SNPs and type of diet on change in body weight in other dietary intervention trials Zhang X, Qi Q, Zhang C, Smith SR, Hu FB, Sacks FM, Bray GA, Qi L. Diabetes 2012;61: Muller TD, Hinney A, Scherag A, Nguyen TT, Schreiner F, Schafer H, Hebebrand J, Roth CL, Reinehr T. BMC Med Genet 2008;9:85, Razquin C, Martinez JA, Martinez-Gonzalez MA, Bes-Rastrollo M, Fernandez-Crehuet J, Marti A.. Int J Obes (Lond) 2010;34:
57 CONCLUSIONS FTO SNP rs genotype AA associated with increased prevalence of obesity Several possible mechanisms: Attenuated suppression of acyl-ghrelin, hunger Differing neural responses to hedonic food cues, acylghrelin suppression High protein diet associated with weight loss in AA subjects Increased satiety in patients with blunted hunger satiation
58 DISCUSSION QUESTION Does this information change your approach to preventing or treating obesity? What role do RDs play in preventing and treating obesity when genetics play a more significant component than previously believed?
59 SOURCES National Human Genome Research Institute.. What Is a Chromosome? Accessed 8 June Web. 25 Feb Sherry,S.T., Ward,M. and Sirotkin,K. (1999) dbsnp Database for Single Nucleotide Polymorphisms and Other Classes of Minor Genetic Variation. Genome Res., 9, andme. What are SNPs? Accessed January 5, Web. 25 Feb Genetic Science Learning Center. Making SNPs Make Sense. Learning. Genetics. Accessed January 5, National Human Genome Research Institute.. What Is a Chromosome? Accessed 8 June Web. 25 Feb Mayo Clinic. Diseases and Conditions: Obesity. Accessed January 5, Centers for Disease Control. Overweight and Obesity. Accessed January 5, Centers for Disease Control. Body Mass Index. Accessed January 5, National Institutes of Health. National Heart, Lung, and Blood Institute. What Causes Overweight and Obesity? Accessed January 5, Obesity in Children. Causes of Obesity in Children. Accessed January 5, 2015 My Daily Intake. Daily Intake Guide. Healthy Eating Made Easy. Accessed January 5, Body Recomposition. The Energy Balance Equation. Accessed January 5, Lutter M, Nestler EJ. Homeostatic and hedonic signals interact in the regulation of food intake. J Nutr 2009;139: Saper CB, Chou TC, Elmquist JK. The need to feed: homeostatic and hedonic control of eating. Neuron 2002;36: Lustig RH. Childhood obesity: behavioral aberration or biochemical drive? Reinterpreting the First Law of Thermodynamics. Nat Clin Pract Endocrinol Metab 2006;2: Beck, M. (2010, July 13). Eating to Live or Living to Eat? Wall Street Journal. Accessed January 5, The National Health Museum. Genes. Accessed January 5, Genetics Home Reference. What is a gene? Accessed January 5, Sherry,S.T., Ward,M. and Sirotkin,K. (1999) dbsnp Database for Single Nucleotide Polymorphisms and Other Classes of Minor Genetic Variation. Genome Res., 9, Qi L, Kang K, Zhang C, van Dam RM, Kraft P, Hunter D, Lee CH, Hu FB. Fat mass-and obesity-associated (FTO) gene variant is associated with obesity: longitudinal analyses in two cohort studies and functional test. Diabetes 2008;57: Genetics Home Reference. Genes. FTO. Accessed January 5, Cheung MK, Yeo GS. FTO Biology and Obesity: Why Do a Billion of Us Weigh 3 kg More? Front Endocrinol (Lausanne) 2011;2:4. Dibble CC, Manning BD. Signal integration by mtorc1 coordinates nutrient input with biosynthetic output. Nat Cell Biol 2013;15: Loos RJ, Yeo GS. The bigger picture of FTO: the first GWAS-identified obesity gene. Nat Rev Endocrinol 2014;10: Fischer, Julia. "Inactivation of the FTO Gene Protects from Obesity." International Weekly Journal of Science. Nature, 22 Feb Web. 25 Feb Frayling TM. Timpson NJ. A Common Variant in the FTO Gene is Associated with Body Mass Index and Predisposes to Childhood and Adult Obesity. Science. (2007) Karra E, O'Daly OG, Choudhury AI, Yousseif A, Millership S, Neary MT, Scott WR, Chandarana K, Manning S, Hess ME, et al. A link between FTO, ghrelin, and impaired brain food-cue responsivity. J Clin Invest 2013;123: Cummings DE, Purnell JQ, Frayo RS, Schmidova K, Wisse BE, Weigle DS. A preprandial rise in plasma ghrelin levels suggests a role in meal initiation in humans. Diabetes 2001;50: Cummings DE, Weigle DS, Frayo RS, Breen PA, Ma MK, Dellinger EP, Purnell JQ. Plasma ghrelin levels after diet-induced weight loss or gastric bypass surgery. N Engl J Med 2002;346: Sharifi F, Yamini M, Esmaeilzadeh A, Mousavinasab N, Shajari Z. Acylated ghrelin and leptin concentrations in patients with type 2 diabetes mellitus, people with prediabetes and first degree relatives of patients with diabetes, a comparative study. J Diabetes Metab Disord 2013;12:51, Sacks FM, Bray GA, Carey VJ, Smith SR, Ryan DH, Anton SD, McManus K, Champagne CM, Bishop LM, Laranjo N, et al. Comparison of weight-loss diets with different compositions of fat, protein, and carbohydrates. N Engl J Med 2009;360: Zhang X, Qi Q, Zhang C, Smith SR, Hu FB, Sacks FM, Bray GA, Qi L. FTO genotype and 2- year change in body composition and fat distribution in response to weight-loss diets: the POUNDS LOST Trial. Diabetes 2012;61: Muller TD, Hinney A, Scherag A, Nguyen TT, Schreiner F, Schafer H, Hebebrand J, Roth CL, Reinehr T. BMC Med Genet 2008;9:85, Razquin C, Martinez JA, Martinez-Gonzalez MA, Bes-Rastrollo M, Fernandez-Crehuet J, Marti A. A 3-year intervention with a Mediterranean diet modified the association between the rs gene variant in FTO and body weight changes. Int J Obes (Lond) 2010;34:
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