In the brains of these mice, the maternal X chromosome sped up biological aging in the hippocampus—a brain area crucial for learning and memory. "What we showed is that these animals' brains were ...

A microscopic image of neurons expressing the mother’s X chromosomes in green, and the father’s X chromosomes in red. Credit: Arturo Moreno. Women are born with two X chromosomes and inherit one from ...

Study in mice and human cadavers hints that a brain-protective gene in the chromosome becomes more active with age. Women tend to live longer than men and are often more resilient to cognitive decline ...