A gene lost during 9,000 years of maize domestication has just been found again — and it could transform how the world feeds itself. Chinese researchers led by Wu Yongrui and Wang Haihai at the Center for Excellence in Molecular Plant Sciences, working with teams from Shanghai Normal University and Sichuan Agricultural University, have successfully isolated a wild maize gene called Teosinte high protein 3 (THP3-T) that dramatically boosts protein content without reducing the amount of grain farmers harvest.
This matters because maize underpins global food security, feeding billions of people and livestock. Yet as farmers selectively bred for bigger harvests and other traits over centuries, they inadvertently lost genes that made the plant protein-rich. The result is that modern maize varieties typically contain just 8.5% protein, forcing livestock producers worldwide to rely heavily on imported soybean meal to supplement animal feed — a costly and logistically complex dependency.
The research, published in Nature on June 3, 2026, reveals how breeders can reclaim what was accidentally abandoned. The THP3-T gene encodes an enzyme called glutamate-oxaloacetate transaminase 1 (GOT1), which sits at the center of how plants convert nitrogen into protein. Natural variations in the gene's promoter and coding sequence boost both how much of the enzyme the plant produces and how efficiently it works, allowing maize to channel more nitrogen into seed protein. What's striking is how rare this beneficial version became: by modern times, only 2.1% of cultivated maize lines retained the superior allele.
But the real breakthrough came from combining THP3-T with another wild gene, THP9-T, which encodes asparagine synthase 4. When researchers introduced both superior versions into Zhengdan958, one of China's most widely planted elite maize hybrids, the results were transformative. Seed protein content jumped from 8.5% to 12–13%, while whole-plant protein rose from 7% to more than 9%. Crucially, grain yield remained unchanged — a combination that had long eluded plant breeders.
This discovery opens a clear path forward for global agriculture. Rather than choosing between nutritious crops and abundant harvests, breeders now have a proven genetic toolkit to achieve both. For developing nations where malnutrition remains a challenge, and for the livestock industry facing mounting feed costs, high-protein maize varieties could ease both food security and economic pressure. The synergistic effect of combining multiple beneficial rare alleles suggests that future discoveries in wild crop relatives could unlock similar gains in other staple grains.
The research also tells a humbling story: the genes modern agriculture needs may already exist in the wild relatives of our crops, waiting in plant repositories and ancestral species. As climate change and population growth intensify pressure on food systems, this work demonstrates why conserving genetic diversity — and looking backward to domesticated crops' wild origins — may be as important as looking forward to new technologies.