Abstract
Epigenetic mechanisms play a critical role in the pathogenesis of human diseases including kidney disorders. As the erasers of DNA methylation, Ten-eleven translocation (TET) family proteins can oxidize 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC), and 5-carboxylcytosine (5caC), thus leading to passive or active DNA demethylation. Similarly, TET family proteins can also catalyze the same reaction on RNA. In addition, TET family proteins can also regulate chromatin structure and gene expression in a catalytic activity-independent manner through recruiting the SIN3A/HDAC co-repressor complex. In 2012, we reported for the first time that the genomic 5-hydroxymethylcytosine level and the mRNA levels of Tet1 and Tet2 were significantly downregulated in murine kidneys upon ischemia and reperfusion injury. Since then, accumulating evidences have eventually established an indispensable role of TET family proteins in not only acute kidney injury but also chronic kidney disease. In this review, we summarize the upstream regulatory mechanisms and the pathophysiological role of TET family proteins in major types of kidney diseases and discuss their potential values in clinical diagnosis and treatment.
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