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Detection of circulating extracellular mRNAs by modified small-RNA-sequencing analysis.

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Extracellular messenger RNAs (ex-mRNAs) show promise as biomarkers. T4 polynucleotide kinase (PNK) treatment significantly enhances ex-mRNA detection in plasma, revealing neutrophil signatures in acute coronary syndrome (ACS) patients.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genomics

Background:

  • Extracellular RNAs (exRNAs) are emerging as critical biomarkers.
  • Extracellular messenger RNAs (ex-mRNAs) may offer advantages over extracellular microRNAs (ex-miRNAs).
  • Optimizing exRNA isolation and analysis is crucial for biomarker discovery.

Purpose of the Study:

  • To evaluate the impact of T4 polynucleotide kinase (PNK) end-treatment on extracellular messenger RNA (ex-mRNA) capture using small-RNA sequencing (sRNA-seq).
  • To investigate the influence of different blood sample types (serum, EDTA, ACD, heparin plasma) on exRNA profiles.
  • To assess the utility of PNK-treated ex-mRNAs for detecting disease-specific signatures, exemplified by acute coronary syndrome (ACS).

Main Methods:

  • Isolation of total exRNA from serum and platelet-poor plasma (EDTA, ACD, heparin).
  • Comparison of conventional sRNA-seq with sRNA-seq employing T4 PNK end-treatment.
  • Analysis of exRNA profiles, including read length distribution, origin (coding vs. non-coding), and cell-type specific contributions.
  • Proof-of-concept study comparing exRNA profiles of ACS patients and healthy controls.

Main Results:

  • PNK treatment increased ex-mRNA read detection by up to 50-fold compared to conventional sRNA-seq.
  • The exRNA pool was primarily derived from hematopoietic cells, platelets, and the liver.
  • Blood sample type significantly influenced exRNA profiles, with serum yielding a higher number of distinct ex-mRNA transcripts.
  • EDTA and ACD plasma exhibited a destabilizing effect on exRNA ribonucleoprotein complexes.
  • PNK-treated ex-mRNAs revealed a neutrophil signature in ACS patients that was not detected by ex-miRNA analysis.

Conclusions:

  • T4 PNK end-treatment substantially enhances the capture and detection of informative ex-mRNAs.
  • Blood sample type critically impacts exRNA profiling, necessitating careful consideration for standardization.
  • PNK-enhanced ex-mRNA sequencing provides improved tissue resolution and holds significant potential for identifying novel disease biomarkers, such as the neutrophil signature in ACS.