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The repertoire and features of human platelet microRNAs

Hélène Plé1, Patricia Landry, Ashley Benham

  • 1Centre Hospitalier Universitaire de Québec Research Center/Centre hospitalier de l'Université Laval, Quebec, Quebec, Canada.

Plos One
|December 11, 2012
PubMed

Insights

Human platelets contain a diverse range of microRNAs (miRNAs), including novel sequences and modified forms. This study characterizes platelet miRNAs, revealing their complexity and potential regulatory roles in hemostasis and thrombosis.

Area of Science:

  • Molecular Biology
  • Hematology
  • Genomics

Background:

  • Platelets play key roles in hemostasis and thrombotic disorders.
  • Platelets possess a diverse messenger RNA (mRNA) transcriptome and microRNAs (miRNAs).
  • Platelet mRNA regulation by miRNAs is suggested but not fully understood.

Purpose of the Study:

  • To elucidate the complete repertoire and features of human platelet microRNAs (miRNAs).
  • To investigate post-transcriptional modifications and isoforms of platelet miRNAs.
  • To establish a foundation for understanding the role of platelet miRNAs.

Main Methods:

  • High-throughput sequencing of human platelet small RNAs.
  • In vitro enzymatic assays to study miRNA uridylation.
  • Bioinformatic analysis to identify miRNA sequences and isoforms (isomiRs).

Main Results:

  • Detected over 492 mature miRNAs and identified 40 novel miRNA sequences in human platelets.
  • Observed post-transcriptional modifications, including terminal adenylation and uridylation, with evidence of TUT4 enzyme activity.
  • Identified numerous microRNA isoforms (isomiRs) from imprecise Drosha/Dicer processing, some with altered mRNA targeting capabilities.

Conclusions:

  • Human platelets harbor a diverse and complex miRNA repertoire.
  • Platelet miRNAs undergo post-transcriptional modifications similar to nucleated cells.
  • This characterization is crucial for understanding the intraplatelet and extraplatelet functions of platelet miRNAs.

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