Unlike a genetic mutation that changes the function or activity of a gene, which can be inhibited by a well-tailored drug, loss of a gene leaves nothing for the drug to target.

不同的基因突变改变了功能或活动的一个基因，它可以抑制一种非常合适的药物，失去了基因树叶什么药物目标。

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Haploinsufficiency --- A cause of genetic disease in which the contribution from a normal allele is insufficient to prevent disease because of a loss-of-function mutation at the other allele.

遗传病的原因之一，单倍的基因剂量不足以维持正常功能。

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