Activation of Cryptic 3' Splice-Sites by SRSF2 Contributes to Cassette Exon Skipping.

Abstract:

:Here we show that the serine/arginine rich splicing factor 2 (SRSF2) promotes cryptic 3' splice-site (3'AG') usage during cassette exon exclusion in survival of motor neuron (SMN2) minigenes. Deletion of the 3'AG' (3'AG'1), its associated branch point (BP') and polypyrimidine tract (PPT') sequences directs SRSF2 to promote a second 3'AG' (3'AG'2) with less conserved associated region for intron splicing. Furthermore, deletion of both 3'AG'1 and 3'AG'2 and their associated sequences triggered usage of a third 3'AG'3 that has very weak associated sequences. Interestingly, when intron splicing was directed to the 3'AG' cryptic splice-sites, intron splicing from the canonical 3'AG splice-site was reduced along with a decrease in cassette exon inclusion. Moreover, multiple SRSF2 binding sites within the intron are responsible for 3'AG' activation. We conclude that SRSF2 facilitates exon exclusion by activating a cryptic 3'AG' and inhibiting downstream intron splicing.

journal_name

Cells

journal_title

Cells

authors

Moon H,Jang HN,Liu Y,Choi N,Oh J,Ha J,Zheng X,Shen H

doi

10.3390/cells8070696

subject

Has Abstract

pub_date

2019-07-10 00:00:00

issue

7

issn

2073-4409

pii

cells8070696

journal_volume

8

pub_type

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