Uploaded May 2026 | Updated September 2026, 3 weeks ago
Indigenous Americans carry high levels of Denisovans DNA in the MUC19 gene, which affects the consistency of salivary mucus. When Homo sapiens first arrived in the Americas - likely over 20,000 years ago - they came armed with this MUC19 variant. It sounds like a minor detail, but in a new and frozen wilderness, this was a matter of life and death.
Early Homo sapiens were adapted to resist pathogens in equatorial Africa. But MUC19 transformed their saliva into a highly effective trap that caught pathogens in the Americas before they could take hold. We carried that new and improved first line of defence into the Americas
Tap link to watch the full film: youtu.be/AnYifWCOa3o
Indigenous Americans carry high levels of Denisovans DNA in the MUC19 gene, which affects the consistency of salivary mucus. When Homo sapiens first arrived in the Americas - likely over 20,000 years ago - they came armed with this MUC19 variant. It sounds like a minor detail, but in a new and frozen wilderness, this was a matter of life and death.
Early Homo sapiens were adapted to resist pathogens in equatorial Africa. But MUC19 transformed their saliva into a highly effective trap that caught pathogens in the Americas before they could take hold. We carried that new and improved first line of defence into the Americas
Tap link to watch the full film: youtu.be/AnYifWCOa3o
