Heterogeneous dysregulation of microRNAs across the autism spectrum - PubMed (original) (raw)
Heterogeneous dysregulation of microRNAs across the autism spectrum
Kawther Abu-Elneel et al. Neurogenetics. 2008 Jul.
Abstract
microRNAs (miRNAs) are approximately 21 nt transcripts capable of regulating the expression of many mRNAs and are abundant in the brain. miRNAs have a role in several complex diseases including cancer as well as some neurological diseases such as Tourette's syndrome and Fragile x syndrome. As a genetically complex disease, dysregulation of miRNA expression might be a feature of autism spectrum disorders (ASDs). Using multiplex quantitative polymerase chain reaction (PCR), we compared the expression of 466 human miRNAs from postmortem cerebellar cortex tissue of individuals with ASD (n = 13) and a control set of non-autistic cerebellar samples (n = 13). While most miRNAs levels showed little variation across all samples suggesting that autism does not induce global dysfunction of miRNA expression, some miRNAs among the autistic samples were expressed at significantly different levels compared to the mean control value. Twenty-eight miRNAs were expressed at significantly different levels compared to the non-autism control set in at least one of the autism samples. To validate the finding, we reversed the analysis and compared each non-autism control to a single mean value for each miRNA across all autism cases. In this analysis, the number of dysregulated miRNAs fell from 28 to 9 miRNAs. Among the predicted targets of dysregulated miRNAs are genes that are known genetic causes of autism such Neurexin and SHANK3. This study finds that altered miRNA expression levels are observed in postmortem cerebellar cortex from autism patients, a finding which suggests that dysregulation of miRNAs may contribute to autism spectrum phenotype.
Comment in
- Comment on the article "Heterogeneous dysregulation of microRNAs across the autism spectrum" by Abu-Elneel et al.
Buyske S. Buyske S. Neurogenetics. 2009 Apr;10(2):167; author reply 169-70. doi: 10.1007/s10048-009-0179-z. Epub 2009 Feb 24. Neurogenetics. 2009. PMID: 19238465 No abstract available.
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