Now scientists find that those with one type of risky gene may also need to catch a virus to trigger the disease.
如今，科学家们发现拥有某一类型这种基因的人或许感染上一种病毒后才会引发克罗恩病。
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A mutation in a brain protein gene may trigger irregular heart beat and sudden death in people with epilepsy, according to new research in the April 14 issue of the Journal of Neuroscience.
根据《The Journal of Neuroscience》4月14日的最新研究，大脑蛋白基因的某个突变会引发癫痫患者心律不齐和猝死。
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In most cases, it's likely that each gene contributes a small amount of risk, and interacts with other genes and environmental factors to trigger the onset.