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HnRNP L represses cryptic exons.

Sean P McClory1, Kristen W Lynch1, Jonathan P Ling2

  • 1Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6059, USA.

RNA (New York, N.Y.)
|March 28, 2018
PubMed
Summary
This summary is machine-generated.

Heterogeneous nuclear ribonucleoprotein L (hnRNP L) represses cryptic exons using CA repeats, similar to other splicing factors. This finding advances understanding of RNA splicing regulation and T cell differentiation.

Keywords:
HNRNPLHnRNP Lalternative splicingcryptic exonsdinucleotide repeats

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Gene Regulation

Background:

  • RNA splicing fidelity is crucial for cellular function and is governed by splicing enhancers and repressors.
  • Splicing factors recognize specific nucleotide repeats to repress cryptic exons, ensuring accurate gene expression.
  • Previous studies identified TDP-43 and PTBP1/PTBP2 as repressors of cryptic exons utilizing UG and CU repeats.

Purpose of the Study:

  • To investigate the role of heterogeneous nuclear ribonucleoprotein L (hnRNP L) in repressing cryptic exons.
  • To determine the specific repeat sequences recognized by hnRNP L for cryptic exon repression.
  • To explore the potential involvement of hnRNP L in developmental processes like T cell differentiation.

Main Methods:

  • Experimental analysis of hnRNP L binding to exonic sequences containing CA repeats.
  • Functional assays to assess the impact of hnRNP L on cryptic exon splicing.
  • Investigation of hnRNP L's role in T cell differentiation models.

Main Results:

  • hnRNP L was demonstrated to repress cryptic exons by recognizing and binding to exonic CA repeats.
  • This repression activity of hnRNP L is particularly significant near the 5' splice site (5'SS).
  • Evidence suggests hnRNP L's involvement in regulating CA repeat-mediated repression for both cryptic exons and T cell development.

Conclusions:

  • hnRNP L acts as a splicing repressor, utilizing CA repeats to prevent the inclusion of cryptic exons.
  • The findings expand the known mechanisms of splicing regulation by identifying a novel role for hnRNP L and CA repeats.
  • hnRNP L's function in CA repeat repression may be critical for normal T cell differentiation and other developmental pathways.