Unraveling the Mystery of Zombie Genes - The Scientist
Thanks to Anne Breggia for this contribution! Unraveling the Mystery of Zombie Genes Digging into how and why some genes are resurrected after death sounds morbid, but it has practical applications. By Iris Kulbatski PhD Life begins and ends in low oxygen. Mammalian embryos are submerged in a hypoxic environment before the cardiovascular system and placenta develop. In this low oxygen state, embryonic stem cells hum with activity. They proliferate, activate developmental genes , and transcribe DNA in an intricate dance that choreographs the first buds of existence. 1,2 When this early mass of pluripotent stem cells, the blastocyst, burrows into the lining of the uterus, access to higher oxygen levels through the maternal blood supply triggers stem cells to differentiate into cells that form the various tissues and organs. 3,4 The genes that initiate and wind the clock of life eventually go dormant as key developmental mi...