Humans and other primates have evolved less sensitive noses
Sijia Wang of the Chinese Academy of Sciences and Joel Mainland of the Monell Chemical Senses Center report these findings in a new study publishing Feb. 3 in the journalEveryone experiences smells in their own unique way -- the same scent can be pleasant, too intense or even undetectable to different noses. Scientists can combine these differences in scent perception with a person's genetics to discover the role of various scent receptors.
Participants carried different versions of the musk and underarm odor receptor genes, and those genetic variations affected how the person perceived the scents. In combination with previously published results, the researchers find that people with the ancestral versions of the scent receptors tend to rate the corresponding odor as more intense.
The genetic analysis also identified three associations between genes for scent receptors and specific odors that scientists had previously reported. These earlier studies include primarily Caucasian participants. The new results from East Asian and diverse populations suggest that the genetics underlying the ability to detect odors remains constant across people from different backgrounds.
The authors add,"Genome-wide scans identified novel genetic variants associated with odor perception, providing support for the hypothesis that the primate olfactory receptor repertoire has degenerated over time."New Scientist
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