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2017 ; 8
(ä): 52
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Evolinc: A Tool for the Identification and Evolutionary Comparison of Long
Intergenic Non-coding RNAs
#MMPMID28536600
Nelson ADL
; Devisetty UK
; Palos K
; Haug-Baltzell AK
; Lyons E
; Beilstein MA
Front Genet
2017[]; 8
(ä): 52
PMID28536600
show ga
Long intergenic non-coding RNAs (lincRNAs) are an abundant and functionally
diverse class of eukaryotic transcripts. Reported lincRNA repertoires in mammals
vary, but are commonly in the thousands to tens of thousands of transcripts,
covering ~90% of the genome. In addition to elucidating function, there is
particular interest in understanding the origin and evolution of lincRNAs. Aside
from mammals, lincRNA populations have been sparsely sampled, precluding
evolutionary analyses focused on their emergence and persistence. Here we present
Evolinc, a two-module pipeline designed to facilitate lincRNA discovery and
characterize aspects of lincRNA evolution. The first module (Evolinc-I) is a
lincRNA identification workflow that also facilitates downstream differential
expression analysis and genome browser visualization of identified lincRNAs. The
second module (Evolinc-II) is a genomic and transcriptomic comparative analysis
workflow that determines the phylogenetic depth to which a lincRNA locus is
conserved within a user-defined group of related species. Here we validate
lincRNA catalogs generated with Evolinc-I against previously annotated
Arabidopsis and human lincRNA data. Evolinc-I recapitulated earlier findings and
uncovered an additional 70 Arabidopsis and 43 human lincRNAs. We demonstrate the
usefulness of Evolinc-II by examining the evolutionary histories of a public
dataset of 5,361 Arabidopsis lincRNAs. We used Evolinc-II to winnow this dataset
to 40 lincRNAs conserved across species in Brassicaceae. Finally, we show how
Evolinc-II can be used to recover the evolutionary history of a known lincRNA,
the human telomerase RNA (TERC). These latter analyses revealed unexpected
duplication events as well as the loss and subsequent acquisition of a novel TERC
locus in the lineage leading to mice and rats. The Evolinc pipeline is currently
integrated in CyVerse's Discovery Environment and is free for use by researchers.