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If rotten fish smells like roses to you, it may be due to a genetic mutation | SmartNews
There are two types of people in the world, those who smell fish and those who do not.New research published in Current biology On Thursday, a rare genetic mutation shows that some people immunize against the unpleasant scent of rotten fish. Nature news Report.
About 11,000 people participated in the study by donating DNA samples and testing their noses. When each of the six scents was presented, each participant took a whim and tried to identify it. For many, the smell of rotten fish was easily identifiable and incredibly unpleasant, but a small group labeled the smell as neutral.
Examination of their DNA revealed that the groups shared a common genetic mutation. They all had at least one broken version of a gene called TAAR5.
“I can assure you that this mutation is absent,” said Kári Stefánsson, a neurologist and co-author of Reykjavik’s deCODE Genetics study. New York Times‘Catherine Wu. “When approaching fish that are not completely fresh, they tend to cause nausea.”
This gene provides a tool that nasal cells use to identify a ranked chemical called trimethylamine (TMA). It is also found in feces, blood and bad breath, Donna Lu writes. New Scientist.. TMA is a danger signal for unpleasant foods, and people’s unpleasant reactions to its unpleasant odors help avoid danger.
“TAAR5 is a very conserved gene and is very similar between species, probably because it is important to protect us from harmful microorganisms,” said deCODE neuroscientist Rosa Gisladottir. Says. New Scientist..
Researchers asked participants to smell the sample with the synthetic odor of cinnamon, peppermint, banana, licorice, lemon, and rotten fish. Successful identification of each scent tended to diminish with age, but young people sometimes confused the scent of bananas and lemons with other sweets. New York Times Report. Each participant also evaluated the comfort of their odor, and rotten fish was by far the worst.
However, for those with a broken TAAR5 gene, the rotten fish odor sample appeared relatively neutral. Some did not smell at all, others identified it as potatoes, caramel, ketchup, and roses, while others ranked it relatively comfortable.
Reykjavik-based company deCODE has been studying people’s DNA for decades, but it may be important that this study was done in Iceland. About 2% of Icelanders carry the TAAR5 gene mutation, which is unusually high compared to other parts of the world. Throughout Europe, 0.8% of people have the same mutation and only 0.2% of people in Africa have the same mutation.
Bettina Malnic, who studies olfaction at the University of Sao Paulo, said: New York Times.. Another sensory science researcher, Paul Joseph, Times Future studies with a more diverse research population may show whether different diets affect the prevalence of mutations.
Iceland mainly has fish dishes. For example, national cuisine, sharkMade of dried and fermented Greenland sharks, it has a urine-like aroma and a pungent cheese-like taste.
“It’s like some kind of local choice,” says Stephenson. New Scientist.. “In Iceland, we have lived mainly in fish for thousands of years.”
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