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目前估计脆性X综合征是全世界具有智力发育不全特征的最常见的遗传形式。许多理论都以说明这一能观察到的特殊的遗传方式为出发点。Laird(1987)提出,脆性X表型是由于X染色体再活化时局部受阻引
It is currently estimated that Fragile X syndrome is the most common form of inheritance of mental retardation in the world. Many theories start with a description of this particular pattern of inheritance that can be observed. Laird (1987) suggested that the fragile X phenotype is due to local blockage of the X-reactivation