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.

‘孤独症可能与很多基因有关。最有可能的情况，就是每个基因都使风险性增加了一点，加上与其它的基因以及与环境因素之间的相互作用，引发了孤独症。’

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When a clock gene is switched on, it directs the cell to produce proteins, which eventually trigger a signal that switches the gene off.

BBC: Body clock 'set before birth'

The scientists used tests on mice to determine whether a defect in this gene is enough to trigger DCM.

BBC: Gene link to inherited heart disease

When it is time to make the plants male again, researchers spray on a chemical (which might also prove a money-spinner for the company) to trigger the activity of another foreign gene that blocks the activity of ribonuclease and allows pollen production once more.

ECONOMIST: Terminator genes