Pianese L, Turano M, Lo Casale M S, De Biase I, Giacchetti M, Monticelli A, Criscuolo C, Filla A, Cocozza S
BioGeM Consortium, c/o Department of Molecular and Cellular Biology and Pathology, Frederico II University, Naples, Italy.
J Neurol Neurosurg Psychiatry. 2004 Jul;75(7):1061-3. doi: 10.1136/jnnp.2003.028605.
The most common causative mutation of Friedreich ataxia (FRDA) is the unstable hyperexpansion of an intronic GAA triplet repeat that impairs frataxin transcription. Using real time quantitative PCR, we showed that FRDA patients had residual levels of frataxin mRNA ranging between 13% and 30% and that FRDA carriers had about 40% of that of controls. Asymptomatic carriers also showed reduced frataxin mRNA levels. We found an inverse correlation between the number of GAA repeats and frataxin mRNA levels. Real-time quantitative PCR may represent an alternative assay for FRDA molecular diagnosis.
弗里德赖希共济失调(FRDA)最常见的致病突变是内含子GAA三联体重复序列的不稳定过度扩增,这会损害frataxin转录。通过实时定量PCR,我们发现FRDA患者的frataxin mRNA残留水平在13%至30%之间,而FRDA携带者的该水平约为对照组的40%。无症状携带者的frataxin mRNA水平也有所降低。我们发现GAA重复序列的数量与frataxin mRNA水平呈负相关。实时定量PCR可能是FRDA分子诊断的一种替代检测方法。