This scientist is helping build a missing map of childhood

In 2017, Deanne Taylor attended a presentation at the University of Pennsylvania, just a short walk from her office. A researcher was there to unveil the Human Cell Atlas, an ambitious project that aimed to map every cell in the human body. Taylor was floored, and then concerned. As details emerged, she discovered that the project’s researchers had only made plans to study adults. “That’s when my little alarm went off,” she says. “ Not again. ” Since joining the Children’s Hospital of Philadelphia (CHOP) as the director of bioinformatics three years earlier, Taylor had been disappointed by the lack of investment in medical research focused on children. The dominant view, she says, was that children are exactly like small adults. They’re not. Children’s cells are different from grownups’ cells in the way they express genes—switching them on and off or turning them up or down. Those variations can cause drastically different and even deadly responses to drugs that adults tolerate well. The 2017 talk was the moment Taylor didn’t know she’d been waiting for. She quickly channeled her concern into a campaign, joining the Human Cell Atlas’s volunteer team and helping write a section on children for a white paper outlining the group’s goals and plans. She then rallied a cross-hospital coalition of pediatric researchers to contribute to the project and spearheaded a 2019 paper that outlined the case for studying children—a bid to attract more interest and funding to the field. “It put a flag in the ground,” she says. “Why don’t we have healthy models of children’s development?” So far, the push has paid off. In 2021 the NIH awarded a $38.5 million grant to the Developmental Genotype-Tissue Expression Project (dGTEx), a major initiative aimed at establishing the first comprehensive database of healthy pediatric tissue. The project banks samples collected from otherwise healthy children who have died and whose parents agreed to donate their bodies, and maps how genes across a