Tiny microbe challenges the definition of cellular life
Scientists recently discovered a microbe with one of the tiniest genomes on Earth. More surprising, the creature is almost entirely dependent on its host: Its genes don’t support any of the functions of metabolism, one of the key processes of life. As such, it challenges fundamental notions of what it means to be a living organism. The discovery was “pure serendipity,” says Takuro Nakayama, an evolutionary microbiologist at the University of Tsukuba in Japan. Takayama wanted to study the many m