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Run Amok Enzyme Causes Same Problems in Both Humans and Fruit Flies

he subsequent splitting leads to new cells with improper proteins mixes, including an overproduction – in this case 10 times more than normal – of new neuroblasts that lead to tumors in the brain.

“We conclude that the aurora-A kinase is required to coordinate the position of proteins within the neuroblasts,” Doe said. “When it is absent, too little neuron-promoting proteins are delivered into the young neurons and they never lose their stem-cell nature. This leads to a stem-cell tumor in the fly brain.”

The team’s findings appear to reverse traditional thinking that too much activation of aurora-A leads to tumors, including those in more than half of colorectal cancers. Instead, Doe and colleagues argue that aurora-A and numb are tumor suppressants under normal conditions, and that a loss of aurora-A is what prompts overproduction of new neuroblasts and, thus, tumor development.

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