Identification of proteins that bind extracellular microRNAs secreted by the parasitic nematode Trichinella spiralis

Author:

Brown Alice123,Selkirk Murray E.2,Sarkies Peter13ORCID

Affiliation:

1. MRC London Institute of Medical Sciences 1 , Du Cane Road, London , W12 0NN, UK

2. Imperial College London 2 Department of Life Sciences , , SW7 2AZ, UK

3. University of Oxford 3 Department of Biochemistry , , South Parks Road, Oxford , OX1 3QU, UK

Abstract

ABSTRACT Small non-coding RNAs such as microRNAs (miRNAs) are conserved across eukaryotes and play key roles in regulating gene expression. In many organisms, miRNAs are also secreted from cells, often encased within vesicles such as exosomes, and sometimes extravesicular. The mechanisms of miRNA secretion, how they are stabilised outside of cells and their functional importance are poorly understood. Recently, we characterised the parasitic nematode Trichinella spiralis as a model to study miRNA secretion. T. spiralis muscle-stage larvae (MSL) secrete abundant miRNAs which are largely extravesicular. Here, we investigated how T. spiralis miRNAs might remain stable outside of cells. Using proteomics, we identified two RNA binding proteins secreted by T. spiralis larvae and characterised their RNA binding properties. One, a homologue of the known RNA binding protein KSRP, binds miRNA in a selective and sequence-specific fashion. Another protein, which is likely a novel RNA binding protein, binds to miRNA without exhibiting sequence specificity. Our results suggest a possible mechanism for miRNA secretion by T. spiralis and may have relevance for understanding the biology of extracellular miRNA more widely.

Funder

University College, University of Oxford

Transgenerational Epigenetics and Evolution

Publisher

The Company of Biologists

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology

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