Intronic Alus influence alternative splicing.

Abstract:

:Examination of the human transcriptome reveals higher levels of RNA editing than in any other organism tested to date. This is indicative of extensive double-stranded RNA (dsRNA) formation within the human transcriptome. Most of the editing sites are located in the primate-specific retrotransposed element called Alu. A large fraction of Alus are found in intronic sequences, implying extensive Alu-Alu dsRNA formation in mRNA precursors. Yet, the effect of these intronic Alus on splicing of the flanking exons is largely unknown. Here, we show that more Alus flank alternatively spliced exons than constitutively spliced ones; this is especially notable for those exons that have changed their mode of splicing from constitutive to alternative during human evolution. This implies that Alu insertions may change the mode of splicing of the flanking exons. Indeed, we demonstrate experimentally that two Alu elements that were inserted into an intron in opposite orientation undergo base-pairing, as evident by RNA editing, and affect the splicing patterns of a downstream exon, shifting it from constitutive to alternative. Our results indicate the importance of intronic Alus in influencing the splicing of flanking exons, further emphasizing the role of Alus in shaping of the human transcriptome.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Lev-Maor G,Ram O,Kim E,Sela N,Goren A,Levanon EY,Ast G

doi

10.1371/journal.pgen.1000204

subject

Has Abstract

pub_date

2008-09-26 00:00:00

pages

e1000204

issue

9

eissn

1553-7390

issn

1553-7404

journal_volume

4

pub_type

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