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2015 ; 16
(ä): 793
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Genome-wide identification and functional analysis of lincRNAs acting as miRNA
targets or decoys in maize
#MMPMID26470872
Fan C
; Hao Z
; Yan J
; Li G
BMC Genomics
2015[Oct]; 16
(ä): 793
PMID26470872
show ga
BACKGROUND: Long intergenic noncoding RNAs (lincRNAs) are endogenous non-coding
RNAs (ncRNAs) that are transcribed from 'intergenic' regions of the genome and
may play critical roles in regulating gene expression through multiple
RNA-mediated mechanisms. MicroRNAs (miRNAs) are single-stranded small ncRNAs of
approximately 21-24 nucleotide (nt) that are involved in transcriptional and
post-transcriptional gene regulation. While miRNAs functioning as mRNA repressors
have been studied in detail, the influence of miRNAs on lincRNAs has seldom been
investigated in plants. METHODS: LincRNAs as miRNA targets or decoys were
predicted via GSTAr.pl script with a set of rules, and lincRNAs as miRNA targets
were validated by degradome data. Conservation analysis of lincRNAs as miRNA
targets or decoys were conducted using BLASTN and MAFFT. The function of lincRNAs
as miRNA targets were predicted via a lincRNA-mRNA co-expression network, and the
function of lincRNAs as miRNA decoys were predicted according to the competing
endogenous RNA (ceRNA) hypothesis. RESULTS: In this work, we developed a
computational method and systematically predicted 466 lincRNAs as 165 miRNA
targets and 86 lincRNAs as 58 miRNA decoys in maize (Zea mays L.). Furthermore,
34 lincRNAs predicted as 33 miRNA targets were validated based on degradome data.
We found that lincRNAs acting as miRNA targets or decoys are a common phenomenon,
which indicates that the regulated networks of miRNAs also involve lincRNAs. To
elucidate the function of lincRNAs, we reconstructed a miRNA-regulated network
involving 78 miRNAs, 117 lincRNAs and 8834 mRNAs. Based on the lincRNA-mRNA
co-expression network and the competing endogenous RNA hypothesis, we predicted
that 34 lincRNAs that function as miRNA targets and 86 lincRNAs that function as
miRNA decoys participate in cellular and metabolic processes, and play role in
catalytic activity and molecular binding functions. CONCLUSIONS: This work
provides a comprehensive view of miRNA-regulated networks and indicates that
lincRNAs can participate in a layer of regulatory interactions as miRNA targets
or decoys in plants, which will enable in-depth functional analysis of lincRNAs.