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MicroRNA regulation in heart and skeletal muscle over the freeze–thaw cycle in the freeze tolerant wood frog

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Abstract

The North American wood frog, Rana sylvatica, is one of just a few anuran species that tolerates whole body freezing during the winter and has been intensely studied to identify the biochemical adaptations that support freeze tolerance. Among these adaptations is the altered expression of many genes, making freeze-responsive changes to gene regulatory mechanisms a topic of interest. The present study focuses on the potential involvement of microRNAs as one such regulatory mechanism and aims to better understand freeze/thaw stress-induced microRNA responses in the freeze-tolerant wood frog. Using quantitative PCR, relative levels of 53 microRNAs were measured in heart and skeletal muscle of control, 24 h frozen, and 8 h thawed frogs. MicroRNAs showed tissue specific expression patterns: 21 microRNAs decreased in the heart during thawing, whereas 16 microRNAs increased during freezing stress in skeletal muscle. These findings suggest that select genes may be activated and suppressed in heart and skeletal muscle, respectively, in response to freezing. Bioinformatics analysis using the DIANA miRPath program (v.2.0) predicted that the differentially expressed microRNAs may collectively regulate tissue-specific cellular pathways to promote survival of wood frogs undergoing freezing and thawing.

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Abbreviations

ARVC:

Arrythmogenic right ventricular cardiomyopathy

cDNA:

Complementary DNA

DIANA:

DNA intelligent analysis

HCM:

Hypertrophic cardiomyopathy

KEGG:

Kyoto encyclopedia of genes and genomes

MAPK:

Mitogen-activated protein kinase

miRNA:

MicroRNA

mRNA:

Messenger RNA

p-bodies:

Processing bodies

qPCR:

Quantitative polymerase chain reaction

pre-miRNA:

Precursor microRNA

pri-miRNA:

Primary microRNA

RISC:

RNA-induced silencing complex

RNA:

Ribonucleic acid

rRNA:

Ribosomal RNA

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Acknowledgments

Thanks to J. M. Storey for editorial review of the manuscript. This work was supported by a Discovery grant (#6793) from the Natural Sciences and Engineering Research Council of Canada (NSERC). KBS holds the Canada Research Chair in Molecular Physiology, and BEL holds an NSERC Canada Graduate Scholarship.

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Authors

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Correspondence to Kenneth B. Storey.

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The authors declare that they have no conflict of interest.

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Communicated by I. D. Hume.

Appendices

Appendix 1

See Table 3.

Table 3 Primers used for analysis of microRNA expression in the heart and skeletal muscle of R. sylvatica

Appendix 2

See Table 4.

Table 4 Enriched KEGG pathways from target genes identified by DIANA miRPath v.2.0 based on sequence complementarity to wood frog heart and skeletal muscle microRNAs

Appendix 3

See Tables 5 and 6.

Table 5 Gene targets derived from DIANA miRPath v.2.0 based on sequence complementarity to differentially expressed microRNAs in heart tissue of R. sylvatica in response to thawing
Table 6 Gene targets derived from DIANA miRPath v.2.0 based on sequence complementarity to differentially expressed microRNAs in skeletal muscle tissue of R. sylvatica in response to freezing

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Bansal, S., Luu, B.E. & Storey, K.B. MicroRNA regulation in heart and skeletal muscle over the freeze–thaw cycle in the freeze tolerant wood frog. J Comp Physiol B 186, 229–241 (2016). https://doi.org/10.1007/s00360-015-0951-3

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  • DOI: https://doi.org/10.1007/s00360-015-0951-3

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