这项发表于NATURE的研究为唐氏(21染色体三体异常)患者带来曙光。科学家将一段称为XIST(the X-inactivation gene)的基因插入此病患者的干细胞后使多余的那条染色体失效, 从而纠正了细胞生长的异常。这段基因的作用是关闭女性胚胎中一条X染色体的表达以避免重复。
Humans are born with 23 pairs of chromosomes, including two sex chromosomes, making a total of 46 in each cell.
People with Down's syndrome have three - rather than two - copies of chromosome 21.


Down's syndrome is caused by an extra chromosome
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