Sorry to disappoint you but in biology and health there is much more than meets the eye.
Your genetic heritage might indicate that your have more chances than usual of developing a disease, but there are many other factors that will contribute to this finally occuring.
Metabolomics studies the footprint of these factors in order to give a more accurate picture of your condition.
In this post you will find what is metabolomics explained in simple words and with examples of application areas.
Metabolomics in simple words
Metabolomics surveys the metabolites that are present in organisms.
What are metabolites?
Metabolites are small molecules, smaller than genes or proteins. They are involved in metabolism as intermediates or products of metabolic processes.
Human examples of metabolites are hormones, amino acids, lipids, vitamins, and antioxidants, among others. Not only humans have metabolites, in fact all live beings need metabolites for their functioning.
Metabolites are responsible for the taste of tomatoes, the smell of plants, the color of fishes, and the poison of spiders.
Why is metabolomics useful?
Metabolomics describes the phenotype of an organism, which quoting Wikipedia is:
the composite of an organism’s observable characteristics or traits: such as its morphology, development, biochemical or physiological properties, phenology, behavior, and products of behavior (such as a bird’s nest).
Phenotypes result from the expression of an organism’s genes as well as the influence of environmental factors and the interactions between the two.
The presence or absence of metabolites (and their concentrations) describes the state of an organism.
A practical application of this definition: Metabolomics can also describe the metabolic signatures of disease versus normality.
Imagine two identical twin brothers (who share almost identical genes). One has a stroke at 45 while the other lives healthy till he dies at 90. How can this happen if they are almost identical? Easy, lifestyle.
Can you guess who was having 2 meals a day at McRonald’s?
If you would have used metabolomics to check their lipid profile, you would have seen that the one with the stroke had a LDL cholesterol level abnormally high.
Examples Of Metabolomics Research
Metabolomics has proved useful to answer biological questions, for instance to determine the effect of a clinical intervention (aka, if I do this to these people, what do I see?) or to unravel the mechanisms of disease, to name a few.
If you are wondering what is metabolomics doing in the real world and what kind of biological questions metabolomics can answer, check these two examples.
How can I make my tomatoes tastier?
Imagine a company that sells tomato seeds want to improve their tomatoes in terms of taste, texture, aroma, and other properties you could not imagine a tomato possess.
Here the company can have two options, either modify genetically the tomatoes or to cross different breeds.
Next, a panel of tomato tasters (you guessed it, taster like with wine) give scores for these properties of each tomato sample.
Now, remember that metabolites are responsible for the taste and other properties of tomatoes.
By comparing the metabolic profiles of tomato types that scored high and low in each property, one can discover which metabolites contribute positively and negatively to the quality of tomatoes.
Is this diet good for reducing cholesterol?
Since you are interested in nutrition and health, you are curious about which diet improves your cholesterol, this is, bad cholesterol goes down, good cholesterol goes up.
The study is designed as follows: 4 different diets plus an extra control diet are chosen. You select 5 groups of people and each one gets a diet.
After some weeks, blood samples from the participants are collected and measured to determine the concentration of different cholesterol metabolites. And there you have your ideal diet to improve you cholesterol levels.
Sounds simple, huh? In fact, this kind of research, if you want solid results, requires a joint effort of many research centers and hundreds of participants.
Check this research about the best diet for weight-loss maintenance.
Their goal was to decide which combination of high/low protein and high/low glycemic index was the, so you avoid the “rebound effect” (spoiler alert: the best diet is high protein and low GI).
Future Directions Of Metabolomics
Single Cell Metabolomics
Two individuals have different metabolic profiles if we measure their urine or blood. In the same fashion, different cell types in our body have different profiles.
In a not-so-far future, we will be able to extract a tiny sample from a single liver cell and compare its metabolic profile to the profile of a white blood cell, for instance.
By doing so, we will be able to focus on the specific organ or tissue involved in our research.
Metabolomics For Personalized Health
Have you heard of what 23andme.com is doing with gene analysis? you spit in a tube, send it by post and you get a detailed report on your genetic predisposition for a long list of diseases.
Now imagine the same, maybe instead of saliva samples with urine, but you will get a metabolic report, which describes your current health and if you are in any developmental stage of a disease.
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