Abstract
MicroRNAs (microRNAs) have been implicated to play crucial roles in various liver diseases. Hepatic microRNAs are released in to the circulation in a systematic fashion, and are, therefore, being extensively explored for their role as prognostic or diagnostic markers or therapeutic targets for numerous hepatic diseases. Advantages such as disease- or tissue-specific expression, and ease of detection have implicated circulating microRNAs (c-microRNAs) as the most desirable candidate for biomarker studies. Although several studies have explored c-microRNAs in serum or plasma, consistency of detection of microRNAs remains demanding because of many biological and methodological challenges. Lack of methodological consensus has limited the universal use of c-microRNAs as potential prognostic or diagnostic disease-specific biomarkers. In this review, we have discussed pre-analytical and analytical factors that might affect c-miRNA expression and selection of appropriate data normalization strategy by incorporating endogenous reference microRNAs. This review will aid designing of better approaches and protocols for future diagnostic research on hepatic c-microRNAs.
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