According to a study published in Current Biology, an interbreeding event that occurred roughly 47 thousand years ago left a biological legacy in modern Homo sapiens, introducing a specific gene variant that increases muscle mass and height. Researchers from the Max Planck Institute for Evolutionary Anthropology and international biobanks analyzed data from numerous adults to map how these ancient genetic segments function across different global populations today.
Regional Distribution of Neandertal Variants in Modern Populations
While Neandertal ancestry is historically associated with European geography, modern Europeans carry only about 0.5 percent of these specific gene variants, according to the Max Planck Institute findings. In contrast, the research shows that 20 percent of the South Asian population and 15 percent of the East Asian population actively carry these traits.
Cellular Mechanisms and Physical Traits Linked to Growth Receptors
Scientists examined two specific amino acid changes on the growth hormone receptor to measure how the ancient DNA impacts human biology. Laboratory cell experiments revealed that cells carrying the Neandertal receptor multiplied 39 percent faster than modern human variants, providing a molecular explanation for the robust skeletal and muscular build historically attributed to archaic humans.
Did you know?
Individuals carrying this specific genetic variant measure an average of 0.3 centimeters taller and possess 0.25 kilograms more muscle mass, according to biometric data examined in the study.
Craniofacial Changes and Jaw Structure Alterations
The genetic code also influences craniofacial development, shaping the structure of the skull and face. Individuals carrying the variant exhibit a shorter rear portion of the lower jawbone, known as the ramus, alongside shorter tooth roots and a distinct tendency toward upper jaw protrusion, as detailed in the genetic mapping data.
Reassessing Archaic Human Stature and Clichés
Anthropologist John Hawks of the University of Wisconsin-Madison and evolutionary geneticist Hugo Zeberg of the Karolinska Institute reported that the findings challenge long-held assumptions about archaic human anatomy. Neandertals were not a short-statured species as often assumed; instead, ancient Eurasian Neandertals averaged taller than contemporary Eurasian humans, according to the researchers.
Frequently Asked Questions
Do all modern humans carry Neandertal DNA?
Neandertals’ biological heritage continues to live on in modern humans, with specific functional variants like the growth hormone receptor allele appearing at different frequencies, such as 20 percent in South Asia and 0.5 percent in Europe, according to Max Planck Institute data.
How much taller are people with this specific Neandertal gene variant?
Data analyzed in the Current Biology study indicate that carriers of this variant are on average 0.3 centimeters taller and carry 0.25 kilograms of additional muscle mass.
Does this single gene variant determine a person’s entire body type?
No, scientists emphasize that while this specific variant has measurable biological effects, it does not solely dictate overall body type or growth outcomes.
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