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The emerging regulatory roles of noncoding RNAs in immune function of fish: MicroRNAs versus long noncoding RNAs

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Abstract

The genome could be considered as raw data expressed in proteins and various types of noncoding RNAs (ncRNAs). However, a large portion of the genome is dedicated to ncRNAs, which in turn represent a considerable amount of the transcriptome. ncRNAs are modulated on levels of type and amount whenever any physiological process occurs or as a response to external modulators. ncRNAs, typically forming complexes with other partners, are key molecules that influence diverse cellular processes. Based on the knowledge of mammalian biology, ncRNAs are known to regulate and control diverse trafficking pathways and cellular activities. Long noncoding RNAs (lncRNAs) notably have diverse and more regulatory roles than microRNAs. Expanding these studies on fish has derived the same conclusion with relevance to other species, including invertebrates, explored the potentials to harness such types of RNA to further understand the biology of such organisms, and opened gates for applying recent technologies, such as RNA interference and delivering micromolecules as microRNAs to living cells and possibly to target organs. These technologies should improve aquaculture productivity and fish health, as well as help understand fish biology.

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Abbreviations

3′-UTR:

3′-Untranslated region

BACE1:

β-Secretase-1

BAI2:

Brain-specific angiogenesis inhibitor 2

BMP10:

Bone morphogenetic protein

eIF2α:

Eukaryotic initiation factor 2 α

HS3ST6:

Heparan sulfate 3-O-sulfotransferase 6

IFN:

Interferon

IRF:

Interferon regulatory factor

KSRP:

SsRNA-binding protein K homology-type splicing regulatory protein

lincRNAs:

Long intergenic ncRNAs

lncRNAs:

Long noncoding RNAs

LPS:

Lipopolysaccharide

MALAT1:

Metastasis-associated long adenocarcinoma transcript 1

MAVS:

Mitochondrial antiviral signaling protein

miRNAs:

MicroRNAs

mRNAs:

Messenger RNAs

Mx:

Myxovirus resistance

MyD88:

Myeloid differentiation primary response 88

ncRNAs:

Noncoding RNAs

NF-κB:

Nuclear factor kappa light-chain enhancer of activated B cells

piRNA:

PIWI-interacting RNAs

poly(I:C):

Polyriboinosinic polyribocytidylic acid

rag1:

Recombination activating gene 1

RIG-I:

Retinoic acid-inducible gene I

rRNAs:

Ribosomal RNAs

SAMHD1:

Histidine aspartate domain-containing protein 1

SAV2-i1:

Salmonid alphavirus subtype 2 isolate 1

SAV3-i4:

Salmonid alphavirus subtype 3 isolate 4

SAV3-i6:

Salmonid alphavirus subtype 3 isolate 6

scaRNAs:

Small Cajal body-specific RNAs

shRNA:

RNA interference

siRNAs:

Small interfering RNAs

snoRNAs:

Small nucleolar RNAs

snRNA:

Small nuclear RNA

STAT:

Signal transducer and activator of transcription

Th:

T helper

TLR:

Toll-like receptor

TNFα:

Tumor necrosis factor α

TRAF6 :

TNF receptor-associated factor 6

VEGF:

Vascular endothelial growth factor

Vpx:

Viral protein X

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Correspondence to Haitham G. Abo-Al-Ela.

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The author has no conflict of interest to declare that is relevant to the content of this article.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Communicated by Michael Polymenis.

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Abo-Al-Ela, H.G. The emerging regulatory roles of noncoding RNAs in immune function of fish: MicroRNAs versus long noncoding RNAs. Mol Genet Genomics 296, 765–781 (2021). https://doi.org/10.1007/s00438-021-01786-x

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  • DOI: https://doi.org/10.1007/s00438-021-01786-x

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