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2017 ; 45
(12
): e112
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Poly(A)-ClickSeq: click-chemistry for next-generation 3?-end sequencing without
RNA enrichment or fragmentation
#MMPMID28449108
Routh A
; Ji P
; Jaworski E
; Xia Z
; Li W
; Wagner EJ
Nucleic Acids Res
2017[Jul]; 45
(12
): e112
PMID28449108
show ga
The recent emergence of alternative polyadenylation (APA) as an engine driving
transcriptomic diversity has stimulated the development of sequencing
methodologies designed to assess genome-wide polyadenylation events. The goal of
these approaches is to enrich, partition, capture and ultimately sequence poly(A)
site junctions. However, these methods often require poly(A) enrichment, 3?
linker ligation steps, and RNA fragmentation, which can necessitate higher levels
of starting RNA, increase experimental error and potentially introduce bias. We
recently reported a click-chemistry based method for generating RNAseq libraries
called 'ClickSeq'. Here, we adapt this method to direct the cDNA synthesis
specifically toward the 3?UTR/poly(A) tail junction of cellular RNA. With this
novel approach, we demonstrate sensitive and specific enrichment for poly(A) site
junctions without the need for complex sample preparation, fragmentation or
purification. Poly(A)-ClickSeq (PAC-seq) is therefore a simple procedure that
generates high-quality RNA-seq poly(A) libraries. As a proof-of-principle, we
utilized PAC-seq to explore the poly(A) landscape of both human and Drosophila
cells in culture and observed outstanding overlap with existing poly(A) databases
and also identified previously unannotated poly(A) sites. Moreover, we utilize
PAC-seq to quantify and analyze APA events regulated by CFIm25 illustrating how
this technology can be harnessed to identify alternatively polyadenylated RNA.