Pseudoexon activation in disease by non-splice site deep intronic sequence variation — wild type pseudoexons constitute high-risk sites in the human genome

Ulrika S.S. Petersen, Thomas K. Doktor, Brage S. Andresen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Accuracy of pre-messenger RNA (pre-mRNA) splicing is crucial for normal gene expression. Complex regulation supports the spliceosomal distinction between authentic exons and the many seemingly functional splice sites delimiting pseudoexons. Pseudoexons are nonfunctional intronic sequences that can be activated for aberrant inclusion in mRNA, which may cause disease. Pseudoexon activation is very challenging to predict, in particular when activation occurs by sequence variants that alter the splicing regulatory environment without directly affecting splice sites. As pseudoexon inclusion often evades detection due to activation of nonsense-mediated mRNA decay, and because conventional diagnostic procedures miss deep intronic sequence variation, pseudoexon activation is a heavily underreported disease mechanism. Pseudoexon characteristics have mainly been studied based on in silico predicted sequences. Moreover, because recognition of sequence variants that create or strengthen splice sites is possible by comparison with well-established consensus sequences, this type of pseudoexon activation is by far the most frequently reported. Here we review all known human disease-associated pseudoexons that carry functional splice sites and are activated by deep intronic sequence variants located outside splice site sequences. We delineate common characteristics that make this type of wild type pseudoexons distinct high-risk sites in the human genome.

Original languageEnglish
JournalHuman Mutation
Volume43
Issue number2
Pages (from-to)103-127
ISSN1059-7794
DOIs
Publication statusPublished - Feb 2022

Bibliographical note

Publisher Copyright:
© 2021 Wiley Periodicals LLC

Keywords

  • aberrant splicing
  • deep intronic sequence variants
  • human genome
  • pre-mRNA splicing
  • pseudoexon
  • RNA sequencing

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