Gene Evolution in the Andes: Potato Power Revolutionizes Human Biology

The domestication of potatoes by indigenous Andean people led to genetic adaptations enhancing starch digestion. New research reveals high copies of the AMY1 gene in Quechua descendants, facilitating better metabolism of starch-rich diets. This evolutionary trait highlights the profound impact of diet on human biology.

Indigenous people in the Andes domesticated the potato, greatly influencing their diet with this starch-rich tuber. This domestication, dating back 6,000 to 10,000 years, led to genetic adaptations seen in their descendants today in Peru, particularly involving the AMY1 gene related to starch digestion.

A recent genomic study documented that these individuals, speaking the Quechua language, possess an average of 10 copies of the AMY1 gene, more than any other known population globally. This genetic enhancement occurred alongside the domestication of the potato, showcasing how cultural practices can shape biological evolution.

This research, published in Nature Communications, emphasizes the role of diet in human evolutionary history, with implications for metabolism and health. The AMY1 gene controls an enzyme that digests starch, and individuals with more copies can better process starchy foods. This study underlines the ancient Andeans' genetic adaptation to a potato-centric diet.