Παρουσίαση του powerpointnutrigenomics will unravel the optimal diet from within a...
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Nutrigenomics/Nutrigenetics
George Dedoussis
Associate Professor of Biology
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Nutrigenomics will unravel the
optimal diet from within a series of
nutritional alternatives, whereas
Nutrigenetics will yield critically
important information that will assist
clinicians in identifying the optimal
diet for a given individual, i.e.,
personalized nutrition
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Nutrigenomics aims to determine the influence of common dietary ingredients on the genome, and attempts to relate the resulting different phenotypes to differences in the cellular and/or genetic response of the biological system.
More practically, nutrigenomics describes the use of functional genomic tools to probe a biological system following a nutritional stimulus that will permit an increased understanding of how nutritional molecules affect metabolic pathways and homeostatic control
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Energy
homeostasis
Nutrient
absorption
Cell
proliferation
Nutritional factors
Transcription factors
Gene transcription
Nutrients acts as dietary
signals
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“Molecular Nutrition & Genomics”
The strategy of Nutrigenomics
80-100000
proteins
20-25000 genes
100000
transcripts
50000 (?)
metabolites
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PPARs are ligand activated
transcription factors
PPAR
9 cis retinoic acid fatty acids
DNA transcription AGGTCAaAGGTCA
+
Gene
Response element
-
Protein
synthesis
Function
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Nutrigenetics, on the other hand, aims to understand how the genetic makeup of
an individual coordinates their response to diet, and thus considers underlying
genetic polymorphisms. In other words, nutrigenetics embodies the science of
identifying and characterizing gene variants associated with differential responses
to nutrients, and relating this variation to disease states
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% of adults normal-weight
77% adults from Laos Republic
72% from Ghana
69% from Madagascar
……
60% from Estonia
……
……
.......
42% from Ireland
35% from Croatia
35% from Malta
31% from Panama
18% from Kiribaldi
WHO, 2011
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Factors predisposing to an energy imbalance
resulting in overweight.
National Academy of Sciences, Preventing
Childhood Obesity: Health in the Balance, 2005.
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Physiological regulation of energy balance
Activation of the NPY/AGRP neurons has an
orexigenic effect, promoting food intake,whereas
the POMC/CART neurons have the opposite
anorexigenic effect.
The NPY/AGRP neurons also have
an inhibitory effect on the
POMC/CART neurons through the
release of γ-aminobutyric acid
(GABA), which might be stimulated
by the binding of ghrelin to GHSRs.
Bell et al., Nature Reviews Genetics
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Heritability of obesity phenotypes
The high heritability (h2) for different measures of obesity—BMI (h2=0.4–0.7),
subscapular skinfold thickness (h2~0.77), WC (h2 ~0.76) and WHR (h2 ~ 0.45)—highlight the effect of genetics in increasing risk to obesity.
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Genetic-linkage
map for obesity
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An additive association of the variant with BMI was replicated in 13 cohorts with 38,759 participants.
The 16% of adults who are homozygous for the risk allele weighed about 3 kilograms more and had 1.67-fold increased odds of obesity when compared with those not inheriting a risk allele.
This association was observed from age 7 years and reflects a specific increase in fat mass.
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100
50
0
% Energy
Low-fat meat
Chicken
Eggs
Fish
Fruit
Vegetables (carrots)
Nuts
Honey
100
50
0
% Energy
Fruit
Vegetables
Beans
Meat
Chicken
Fish
Grain
Milk/-products
Isolated Carbohydrates
Isolated Fat/Oil
Alcohol
Older times Modern Times
The same genes – The changed diet
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1.5 hours before a test-meal
lunch, children ingested a
beverage or combination of
food and beverage that
varied in energy density:
a no-energy control
consisting of 250 ml of water
(0 kJ)
a low-energy combination of a 250-ml orange drink and 56-g muffin (783 kJ)
a high-energy combination of a 250-ml orange drink and 56-g
muffin (1628 kJ)
The amount of food
subsequently consumed at the test meal
was assessed by weighing the
food items before and after
eating.
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PPAR gamma
In vitro studies have shown that the Ala12 isoform of PPAR2 has a reduced ability in activating transcription and inducing adipogenesis. Subjects carrying the Ala12 allele have been reported to
exhibit higher plasma concentrations of total and low-density lipoprotein (LDL) cholesterol
This particular subtype is mainly expressed in adipose tissue, where it acts as a major regulator of adipocyte differentiation and plays a central role in lipid and glucose homeostasis.
Peroxisome proliferator activated receptor-(PPAR) is a member of the nuclear hormone receptor super-family of ligand-dependent transcription factors.
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Pro12Ala and fat intake
Healthy subjects (n=2141) within the Nurses' Health Study. Among homozygous wild-type Pro/Pro individuals(shaded bars) , those in the highest quintile of total fat intake, had
significantly higher mean body mass index (BMI) compared with those in the lowest quintile whereas among 12Ala variant allele-carriers (hatched bars) there was no significant trend
observed between dietary fat intake and BMI.
(Memisoglou et al., 2003)
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Metabolism 2011
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The results show that with lower fiber intake (1st quartile), children with the minor allele have lower adiponectin levels, while those with the common allele are protected
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Dedoussis et al., 2010 EJCN
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Grouping dairy intake, into low (1.9 ± 0.7 servings/day) and high dairy products eaters (4.4 ± 1.5 servings/day), children with the A allele being high dairy products eaters were taller compared with low dairy products eaters (148.8 ± 0.5 cm vs. 147.4 ± 0.5 cm respectively, p=0.05)
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PLoS Med. 2011
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Forest plot of the effect of the interaction between the FTO rs9939609 SNP and physical activity on BMI in a random effects meta-analysis of 218,166 adults. The studies are sorted by sample size (largest sample size lowest).
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Interestingly, we found a geographic difference in the interaction of FTO with PA, which was consistent across the studied phenotypes.
In particular, the interaction was stronger in North American populations than in populations from Europe.
We speculate that the geographic difference may, at least in part, be related to the lower average levels of PA in individuals living inNorth America than in Europe
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Optimal Nutrition
Lifestyle
Individual genotype
Functional phenotype
Our “gene passports” and
nutrition
AA AB BB
Improvement
Maintenance of Health
“Eat right for your genotype??”
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Personalized diets?
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We are on the right track but still, there is a lot of work to do……..
www.nugo.org
http://www.isnn.info/
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