-Methyladenine Hinders RNA- and DNA-directed DNA Synthesis: Application in Human RRNA Methylation Analysis of Clinical Specimens

Overview

Journal Chem Sci

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2018 Jun 19

PMID 29910902

Citations 19

Authors

Shaoru Wang

Jiaqi Wang

Xiaoe Zhang

Boshi Fu

Yanyan Song

Pei Ma

Kai Gu

Xin Zhou

Xiaolian Zhang

Tian Tian

Xiang Zhou

Affiliations

Soon will be listed here.

Abstract

-Methyladenine (mA) is the most abundant internal modification on mammalian mRNA. Very recently, mA has been reported as a potentially important 'epigenetic' mark in eukaryotes. Until now, site-specific detection of mA is technically very challenging. Here, we first reveal that mA significantly hinders DNA- and RNA-directed DNA synthesis. Systematic investigations of 5'-triphosphates of a variety of 5-substituted 2'-deoxyuridine analogs in primer extension have been performed. In the current study, a quantitative analysis of mA in the RNA or DNA context has been achieved, using DNA polymerase catalyzed primer extension. Molecular dynamics study predicted that mA in template tends to enter into and be restrained in the MGR region of DNA polymerase, reducing conformational flexibility of the DNA backbone. More importantly, a site-specific determination of mA in human ribosomal RNA (rRNA) with high accuracy has been afforded. Through a cumulative analysis of methylation alterations, we first reveal that significantly cancer-related changes in human rRNA methylation were present in patients with hepatocellular carcinoma.

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