Abstract:
BACKGROUND:Adenosine deaminase acting on RNA 1 (ADAR1) is known to mediate deamination of adenosine-to-inosine through binding to double-stranded RNA, the phenomenon known as RNA editing. Currently, the function of ADAR1 in gastric cancer is unclear. AIMS:This study was aimed at investigating RNA editing-dependent and editing-independent functions of ADAR1 in gastric cancer, especially focusing on its influence on editing of 3' untranslated regions (UTRs) and subsequent changes in expression of messenger RNAs (mRNAs) as well as microRNAs (miRNAs). METHODS:RNA-sequencing and small RNA-sequencing were performed on AGS and MKN-45 cells with a stable ADAR1 knockdown. Changed frequencies of editing and mRNA and miRNA expression were then identified by bioinformatic analyses. Targets of RNA editing were further validated in patients' samples. RESULTS:In the Alu region of both gastric cell lines, editing was most commonly of the A-to-I type in 3'-UTR or intron. mRNA and protein levels of PHACTR4 increased in ADAR1 knockdown cells, because of the loss of seed sequences in 3'-UTR of PHACTR4 mRNA that are required for miRNA-196a-3p binding. Immunohistochemical analyses of tumor and paired normal samples from 16 gastric cancer patients showed that ADAR1 expression was higher in tumors than in normal tissues and inversely correlated with PHACTR4 staining. On the other hand, decreased miRNA-148a-3p expression in ADAR1 knockdown cells led to increased mRNA and protein expression of NFYA, demonstrating ADAR1's editing-independent function. CONCLUSIONS:ADAR1 regulates post-transcriptional gene expression in gastric cancer through both RNA editing-dependent and editing-independent mechanisms.
journal_name
Dig Dis Scijournal_title
Digestive diseases and sciencesauthors
Cho CJ,Jung J,Jiang L,Lee EJ,Kim DS,Kim BS,Kim HS,Jung HY,Song HJ,Hwang SW,Park Y,Jung MK,Pack CG,Myung SJ,Chang Sdoi
10.1007/s10620-018-5081-9subject
Has Abstractpub_date
2018-07-01 00:00:00pages
1835-1850issue
7eissn
0163-2116issn
1573-2568pii
10.1007/s10620-018-5081-9journal_volume
63pub_type
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