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Long non-coding RNAs (lncRNAs) are implicated in various cellular and pathological processes. Two lncRNAs, myocardial infarction-associated transcript ( MIAT ) and metastasis-associated lung adenocarcinoma transcript 1 ( MALAT1 ), may be involved in the pathogenesis of coronary artery disease (CAD). Here, we aimed to determine the relative circulating levels of  MIAT  and  MALAT1  in 110 stable CAD patients and 117 controls and to correlate their levels with the clinical and laboratory data. Peripheral blood expression levels were quantified by Real-Time qPCR. The median  MIAT  expression level in CAD patients was significantly 12-fold higher than controls ( p <0.001). Otherwise, the median  MALAT1  expression level was comparable in patient and control groups. Both lncRNAs showed significantly higher relative expression levels in patients with positive history of previous cardiac ischemic events, and  MIAT  showed significantly higher expression in diabetic CAD patients. The area under the curve of  MIAT  (0.888 ± 0.02 with sensitivity 95.5% and specificity 72.7%), was significantly larger than that of  MALAT1  (0.601 ± 0.04 with sensitivity 50% and specificity 63.6%) for detecting the presence of significant CAD. The current findings suggest that lncRNA  MIAT  could have a diagnostic significance in CAD patients.  MALAT1  levels, however, are not sufficiently reliable to have much clinical use in our cases.

genetics and molecular biology

Association of long non-coding RNA MIAT and MALAT1 expression profiles in peripheral blood of coronary artery disease patients with previous cardiac events