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Preclinical validation of a multiplex real-time assay to quantify SMN mRNA in patients with SMA.


ABSTRACT: To determine whether survival motor neuron (SMN) expression was stable over time.We developed a multiplex real-time reverse transcriptase (RT)-PCR assay to quantify SMN transcripts in preclinical blood samples from 42 patients with spinal muscular atrophy (SMA) drawn for three time points per patient; most blood samples were shipped to a centralized laboratory.We obtained a sufficient amount (9.7 +/- 5.6 microg) of good-quality total RNA, and RNAs were stable for up to a 3-year interval. This allowed RNA samples collected during a 9- to 12-month period to be analyzed in a single run, thus minimizing interexperimental variability. SMN expression was stable over time; intersample variability for baseline measures, collected during a 17-month interval, was less than 15% for 38 of 42 SMA patients analyzed. This variability was well below the 1.95-fold increase in full-length SMN (flSMN) transcripts detected in SMA fibroblasts treated with 10 mM valproic acid.Real-time quantification of SMN messenger RNA expression may be a biomarker that is amenable to multicenter SMA clinical trials.

SUBMITTER: Simard LR 

PROVIDER: S-EPMC3273325 | biostudies-literature | 2007 Feb

REPOSITORIES: biostudies-literature

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Preclinical validation of a multiplex real-time assay to quantify SMN mRNA in patients with SMA.

Simard L R LR   Bélanger M-C MC   Morissette S S   Wride M M   Prior T W TW   Swoboda K J KJ  

Neurology 20070201 6


<h4>Objective</h4>To determine whether survival motor neuron (SMN) expression was stable over time.<h4>Methods</h4>We developed a multiplex real-time reverse transcriptase (RT)-PCR assay to quantify SMN transcripts in preclinical blood samples from 42 patients with spinal muscular atrophy (SMA) drawn for three time points per patient; most blood samples were shipped to a centralized laboratory.<h4>Results</h4>We obtained a sufficient amount (9.7 +/- 5.6 microg) of good-quality total RNA, and RNA  ...[more]

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