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Myeloproliferative neoplasms (MPNs) are a kind of bone marrow diseases and Ten-Eleven Transcription 2 (TET2)
mutations are found in MPN patients.Located on 4q24, TET2 can catalyze the conversion from 5-methylcytosine (5mC)
to 5-hydroxymethylcytosine (5hmC) in DNA. TET2 mutations,such as nonsense mutations, out-of-frame insertions, deletions,
and splice site mutations, alter catalytic activity andlead to low level of 5hmC. However, it was unclear why some MPN patients
with wild type TET2 also revealed both low level of 5hmC.To explore other factors affecting the 5hmc level, we investigated the
microRNAs? post-transcriptional regulation of TET2 and its associated genes using 11 bioinformatics resources in our previous
study. It was found that TET2 is associatedeight genes and they are targets of miR-152 and miR-29b.Importantly, DNMT-1,an
associated gene, is a DNA methyltransferase catalyze the methylation, in whicha methyl group is added to cytosine and 5mC is
formed.Involvement of microRNAs may explain the low 5hmC level in MPN patients with wild type TET2.
Microarray dataset of Chronic Myeloid Leukemia (CML) patients, a class of MPN, was downloaded from Gene Expression
Omnibus (GEO). The expression profiles of TET2 and its associated genes were extracted from the microarray dataset, forming
an ?omic? expression matrix. We constructed the co-expression network of these nine genes and explained the regulatory roles
of microRNAs in CML (and thus MPN) through the analysis of the gene co-expression levels and the network topology.
Dr. Lawrence Wing-Chi CHAN is currently Assistant Professor inthe Department of Health Technology and Informatics at the HongKong Polytechnic
University. Hiscurrent research interests include gene regulation by microRNAs and transcription factors, ontological patient similarity and clinical
decision support. Dr. Chan has published more than 12 SCIjournal papers, one of which has been non-self cited for 29 times,and three book
chapters, presented 23 conference papers or posters,granted or filed three patents, and received two international awards and one external research
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