Abundant and Altered Expression of PIWI-Interacting RNAs during Cardiac Hypertrophy

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• 作者：K. Shanmugha Rajan ; BTech^a ; ¹ ; ² ; Ganesan Velmurugan ; PhD^a ; ² ; Pandi Gopal ; PhD^b ; Tharmarajan Ramprasath ; PhD^c ; D.D. Venkatesh Babu ; MSc^a ; S. Krithika ; MSc^b ; Y. Christy Jenifer ; MSc^a ; Allen Freddy ; PhD^d ; George William Jn ; PhD^e ; Krishnan Kalpana ; PhD^f ; Subbiah Ramasamy ; PhD^a ; ^{subbiahr@nrcbsmku.org" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Cardiac hypertrophy ; Small RNA deep sequencing ; Small non-coding RNA ; piRNA ; Retrotransposons
• 刊名：Heart, Lung and Circulation
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：25
• 期：10
• 页码：1013-1020
• 全文大小：1119 K

文摘

The discovery of PIWI-interacting RNAs (piRNAs) has fundamentally changed our understanding of post transcriptional regulation of transposons and other genes. Unlike miRNA and siRNA, the piRNAs are the most abundant but least studied RNA species in mammals. Although the expression of PIWI proteins and piRNAs has long been regarded as germline specific, increasing evidences suggest the expression of piRNAs in somatic cells.

Methods

In this study, the small RNA sequencing executed during induction of cardiac hypertrophy in both in vivo and in vitro conditions were annotated for the expression of piRNAs. The expression of piRNAs was validated by qPCR and RNA immunoprecipitation. In addition, the presence of piRNAs in circulation of myocardial infarction patients was studied by qPCR.

Results

We identified an abundant and altered expression of piRNAs during cardiac hypertrophy. The differentially expressed piRNAs was validated by qPCR and RNA immunoprecipitation. The significantly and differentially expressed piRNAs were predicted to target different retrotransposons and mRNAs in the rat genome. The detection of specific piRNA in serum of myocardial infarction patients suggests the potential of piRNA for diagnosis.

Conclusion

Overall this study is the first to provide a whole-genome analysis of the large repertoire of piRNAs in the cardiac system and this would pave a new path to understanding the molecular aetiology of piRNA and retrotransposons in the physiology and pathology of the cardiac system.