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Updated: Jul 18, 2026

A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene

A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene

Published on: September 16, 2019

将脆弱的X处的DNA不稳定性映射到三核酸重复序列p(CCG) n

E J Kremer¹, M Pritchard, M Lynch

¹Department of Cytogenetics and Molecular Genetics, Adelaide Children's Hospital, South Australia.

Science (New York, N.Y.)

|June 21, 1991

概括

脆弱X综合征血统的不稳定性与特定的三核酸重复序列有关. 这种复制副本数量的变化可能解释了脆弱的部位和观察到的遗传不稳定性.

科学领域:

遗传学是一个遗传学.
分子生物学分子生物学
人类疾病人类疾病

背景情况:

脆弱X综合征是一种与X染色体上脆弱部位相关的遗传疾病.
以前的研究表明,脆弱的X综合征血统中的特定DNA区域的不稳定性.

研究的目的:

确定在脆弱X综合征中显示不稳定性的限制片段的DNA序列.
定位不稳定区域并研究其分子基础.

主要方法:

一个Pst I限制片段的DNA测序.
对正常和受影响个体的侧面序列的分析.
在体细胞杂交中的断点的映射.
克隆和重复区域的聚合酶连锁反应 (PCR) 放大.

主要成果:

这种不稳定性局限于三核酸重复序列,p(CCG) n.
在正常和受影响的个体之间,围绕重复的序列被保存.
在体细胞杂交中的断点映射到重复区域.
在克隆和PCR放大过程中,反复证明了体外不稳定性.

结论:

三核酸重复的拷贝数的变化被认为是不稳定的分子基础.
这种重复拷贝数的变化可能解释了在脆弱X综合征中观察到的脆弱部位.
这些发现为不稳定的区域的体内和体外特性提供了分子解释.

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