Have you ever been in an argument with someone about a scent that you find exquisite, but they find intolerable?

Perhaps you feel that a perfume many admire is a bit... uncomfortable for you. The answer to these differences has a lot to do with your genes.

In the exquisite art of perfumery, smell is the protagonist. Just as we perceive colors through three types of visual receptors, the sense of smell operates at a remarkably more complex level: our nose contains around 400 types of olfactory receptors, each associated with a gene. These genes are unique to each person, and this genetic diversity affects how each individual experiences smells.

 

Why is Scent Such a Personal Thing?

Recent studies have focused on exploring the genetics of olfactory perception. In one of them, people were exposed to 10 different scents. Four of these odors – barley, apple, blue cheese, and violet – showed a deep genetic basis in their perception. The fascinating thing is that these odors are independent of each other: that is, a person with an exquisite sensitivity to the floral aroma of violet might not have the same level of perception of the sweetness of an apple.

The difference in olfactory sensitivity makes each aromatic experience unique. This phenomenon helps explain why someone might perceive a certain "soapy" scent in cilantro while another person only perceives fresh notes. The perception of cilantro, in fact, is one of the most interesting expressions of this relationship between genetics and perception, as it generates a lot of controversy among those who discover the differences.

Scent: An Inherited Legacy

Olfactory perception is, to a large extent, a family inheritance. Just as we inherit the color of our eyes or the tone of our skin, our olfactory receptors are also passed down from parents to children. This genetic inheritance means that preferences and aversions to certain aromas may have an ancestral origin. If your parents detect the bitter aroma in cilantro and find it unpleasant, it is very likely that you will experience the same thing, due to the same genes that manage the olfactory receptors.

This olfactory legacy not only shapes our preference or rejection of certain everyday aromas, but also influences how we perceive the world of perfume, possibly turning this experience into a reflection of our lineage.

 

Genetics and Olfactory Experience: Some Examples

One of the most intriguing examples of olfactory perception is the molecule androstenone, a pheromone present in wild boars that some people describe as woody and pleasant, while others detect an unpleasant urine smell; and others, simply, do not perceive it at all. The explanation for this variation also lies in genetics.

Similarly, in the case of cilantro, perception can vary depending on the expression of a particular olfactory receptor gene, which determines whether a person will detect that soapy touch or its freshness.

On the other hand, we find violet, which smells fragrant and floral to people with a sharpened sense, while less sensitive people describe the aroma as unpleasantly sour and acidic.

This phenomenon has a parallel gene related to the perception of bitter taste, and reflects how each olfactory note can evoke such a unique response in each individual.

In perfumery, this rich genetic diversity is a treasure, as it allows for the creation of complex fragrances that capture the essence of different sensory worlds in a single experience.

 

Perfume Selection and Olfactory Preferences

Our sense of smell, in addition to helping us distinguish aromas, is deeply intertwined with our emotions and memories. This is why perfumes are not just a series of notes; they are a deeply personal, even emotional, experience.

Variations in our olfactory receptors not only influence the intensity of aromas, but also determine how they are perceived. This uniqueness explains why two people can describe the same perfume with very different words.

But each neuron has only one type of odor receptor, meaning it can only detect odors that have the right structure.

Perfumers, aware of the genetic diversity in olfaction, seek to create fragrances that embrace a spectrum of notes, in an effort to resonate with different olfactory sensitivities.

As technology advances, we can expect increasingly personalized perfumes, adjusted not only to preferences, but to the genetic profile of the wearer.

 

A Unique Olfactory Journey

Next time you choose a perfume, remember that the way that scent envelops you is as unique as your genetic fingerprint.

We invite you to explore freely, to experiment and to immerse yourself in the olfactory journey, knowing that every fragrance that attracts or displeases you is an expression of your genetic code.

Ultimately, the world of perfumes is as diverse and unique as each individual who discovers it.