Neanderthal Gene Variant Linked to Added Muscle Mass
A specific inherited genetic marker increases growth hormone receptor signaling, according to 2026 research findings.
Updated on Oct. 12, 2026 in Life Sciences
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On August 5, 2026, researchers identified a specific Neanderthal genetic variant that is associated with increased muscle mass in modern humans. The study confirmed that adult carriers of this variant possess approximately 270 grams more muscle mass on average than those without it.
Why it matters
This finding illustrates how interbreeding between Neanderthals and modern humans 45,000 to 49,000 years ago continues to influence the biological composition of contemporary populations. Understanding these genetic legacies helps clarify the functional impact of the 2% to 3% Neanderthal ancestry found in modern non-African groups.
The Neanderthal version of the growth hormone receptor includes two amino-acid changes and one deletion, which produced 40% stronger signaling in laboratory-grown cells. While this variant significantly alters adult muscle mass, the researchers observed no clear association with childhood growth.
The players
Max Planck Society
A German research organization focused on fundamental scientific advancement in biology, physics, and human history.
The details
Researchers performed comparative analyses between laboratory-grown cells expressing the Neanderthal receptor and those expressing the modern human version. The Neanderthal variant influences body tissue regulation through the growth hormone receptor, which is a protein that binds to growth hormones to trigger physiological development. By analyzing genetic and physical data from large populations, the study confirmed that this specific structural change in the receptor correlates with increased muscle density in adults.
Timeline
45,000 to 49,000 years ago: Humans and Neanderthals experienced a significant gene-flow event.
40,000 years ago: Neanderthals disappeared as a distinct population group.
2025: A study in Nature mapped the broader landscape of Neanderthal DNA gene-flow.
August 5, 2026: The Max Planck Society published the findings regarding the muscle mass variant.
The Tech Race
This research builds directly upon the 2025 Nature study that mapped the overall landscape of Neanderthal DNA gene-flow in modern humans. It represents a shift from identifying the presence of ancient ancestry to determining how specific, inherited gene variants function in modern biology.
This study does not offer immediate medical interventions or products for the public, as it describes a fundamental biological trait inherited from ancestral populations. The variant is most prevalent in the Pakistani population, where it appears in 24% of residents.
The takeaway
The study confirms that small segments of Neanderthal DNA significantly influence the physical characteristics of modern populations. Researchers will continue to watch for future papers mapping other physiological traits linked to the remaining 2% to 3% of Neanderthal genetic material.
Further reading
For broader context on human evolution and genomics, explore our Life Sciences section.
Source note: This article includes information reported by Medindia.
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