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Poly(A) binding protein nuclear 1 levels affect alternative polyadenylation.

Eleonora de Klerk1, Andrea Venema, S Yahya Anvar

  • 1Center for Human and Clinical Genetics, Leiden University Medical Center, 2300 RC Leiden, The Netherlands.

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|July 10, 2012
PubMed
Summary
This summary is machine-generated.

Oculopharyngeal muscular dystrophy (OPMD) is linked to altered gene expression due to faulty polyadenylation. This study reveals that dysfunctional Poly(A) binding protein nuclear 1 (PABPN1) causes widespread changes in 3'-untranslated regions, impacting gene regulation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The 3 -untranslated region (3 -UTR) length, determined by polyadenylation site choice, influences gene expression.
  • Poly(A) binding protein nuclear 1 (PABPN1) plays a crucial role in mRNA polyadenylation.
  • Oculopharyngeal muscular dystrophy (OPMD) is associated with an expanded alanine repeat in PABPN1 (exp-PABPN1) and observed gene expression disturbances.

Purpose of the Study:

  • To investigate the hypothesis that PABPN1 dysfunction in OPMD affects alternative polyadenylation, leading to altered mRNA stability, localization, and translation.
  • To explore genome-wide polyadenylation site usage in mice overexpressing exp-PABPN1.

Main Methods:

  • Development of a single-molecule polyadenylation site sequencing method.
  • Genome-wide analysis of polyadenylation site usage in mice overexpressing exp-PABPN1.
  • Validation in cultured myogenic cells with PABPN1 knockdown or overexpression.

Main Results:

  • Identified 2012 transcripts with altered polyadenylation site usage in exp-PABPN1 mice.
  • Observed a predominant shift towards more proximal alternative polyadenylation sites, resulting in shorter 3 -UTRs.
  • Found that 3 -UTR shortening generally correlated with increased gene expression, and similar changes were induced by manipulating exp-PABPN1 in cell cultures.

Conclusions:

  • PABPN1 is critical for accurate polyadenylation site selection.
  • Reduced functional PABPN1 in OPMD leads to alternative polyadenylation site usage.
  • This deregulation of polyadenylation contributes to the widespread gene expression changes observed in OPMD.