The Evolutionary Roots of Human Vision: A 500 Million-Year Journey
Scientists at UC San Diego have discovered that the protein responsible for vertebrates' camera-like vision, known as IRBP, originated from bacteria over 500 million years ago through horizontal gene transfer. This acquisition allowed for the efficient recycling of retinoids, molecules that sense light, and provided unique functionality to vertebrate eyes. The study highlights the significant role of bacterial genes in the evolution of complex structures and challenges traditional notions of genetic tinkering in evolutionary advancements.