Genome-wide analysis of MicroRNA-messenger RNA interactome in ex-vivo gill filaments, Anguilla japonica.

ABSTRACT: BACKGROUND:Gills of euryhaline fishes possess great physiological and structural plasticity to adapt to large changes in external osmolality and to participate in ion uptake/excretion, which is essential for the re-establishment of fluid and electrolyte homeostasis. The osmoregulatory plasticity of gills provides an excellent model to study the role of microRNAs (miRs) in adaptive osmotic responses. The present study is to characterize an ex-vivo gill filament culture and using omics approach, to decipher the interaction between tonicity-responsive miRs and gene targets, in orchestrating the osmotic stress-induced responses. RESULTS:Ex-vivo gill filament culture was exposed to Leibovitz's L-15 medium (300 mOsmol l-?1) or the medium with an adjusted osmolality of 600 mOsmol l-?1 for 4, 8 and 24?h. Hypertonic responsive genes, including osmotic stress transcriptional factor, Na+/Cl--taurine transporter, Na+/H+ exchange regulatory cofactor, cystic fibrosis transmembrane regulator, inward rectifying K+ channel, Na+/K+-ATPase, and calcium-transporting ATPase were significantly upregulated, while the hypo-osmotic gene, V-type proton ATPase was downregulated. The data illustrated that the ex-vivo gill filament culture exhibited distinctive responses to hyperosmotic challenge. In the hyperosmotic treatment, four key factors (i.e. drosha RNase III endonuclease, exportin-5, dicer ribonuclease III and argonaute-2) involved in miR biogenesis were dysregulated (P?

SUBMITTER: Ng HM 

PROVIDER: S-EPMC7057501 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature