- Open Access
Molecular signature of selective microRNAs in Cyprinus carpio (Linnaeus 1758):a computational approach
ExRNA volume 1, Article number: 11 (2019)
MicroRNAs (miRNAs) are small single stranded non-coding RNAs that performed significant role in post-transcriptional regulation of target gene product. They are typically conserved among the organisms and also involved in multiple biological processes by degrading the targeted mRNAs by suppression or destabilization. Their conserved nature in various organisms provide a good source of miRNA identification and characterization using comparative genomic approaches through the bio-computational tools. The present work highlighted about common carp’s (Cyprinus carpio) conserved miRNAs which were identified and characterized using some bioinformatical strategies based on miRBase, Expressed Sequence Tag (EST) and Genomic Survey Sequence (GSS) databases. Using web based tools total 10 selected miRNAs belongs to 10 different families were illustrated and functionally categorized in Cyprinus carpio. Which have elemental role in regulation and expression of gene-protein interaction specially focused in biological processes of carp. Through real time application of mature miRNA sequences as probe the effective targets for selected common carp miRNAs were detected and catagorised using local BLAST online program and miRBase software. Imperative miRNAs of Cyprinus carpio are indentified via miRBase database and cautiously characterized with the associated gene encoded target protein. Those proteins having a key regulatory role in cellular signal transduction, transcription factor and associated biomolecules responsible for the metabolism, growth and development of carp skeletal muscle as well as preconditioning of skeletal myoblasts components. These selected miRNAs and their targets in common carp may enhance the better understanding and knowhow of miRNAs as superior role in regulating the metabolism, growth and developmental factors of Cyprinus carpio.
The common carp (Cyprinus carpio, Linnaeus 1758) is an important captured and cultured finfish species in the wider domain of freshwater aquaculture. It is native to Europe and Asian continent and has been introduced to every part of the world except the poles [1,2,3]. The main attention of the venture is to give a condensed data identified along with the selective miRNAs and their predefined gene target functions in Cyprinus carpio. Precise supportive data concerned with the ribonucleotide-proteins communication will support the modern, auxiliary science using present day in backing to the real field application on computational methodologies . Researcher already found as the reliable sub- cellular components miRNAs in numerous protein regulatory pathways within the cytoplasmic space; precisely MicroRNAs (miRNAs) are small (20–22 nucleotides/nts) non-coding RNAs, involved primarily in post-transcriptional regulation of mRNA (messenger RNA) when loaded onto RNA-Induced Silencing Complex (RISC). Subsequently the mature miRNAs guided the RISC to specific protein coding messenger RNA (mRNA) target modules, where a very important protein family which is known as Argonaut protein (Ago2) collaborates with mRNA and it involves the function of mRNA repression or destabilization [5, 6]. Recently number of molecular approaches figure out that the biogenesis and function of miRNAs are categorically related to the molecular mechanisms or actions of various clinical diseases. Which are potentially regulates many aspect of cellular and sub-cellular activities that might be included animal organ developmental stages, growth, metabolism as well as signal transduction pathways. After distinguishing the evidence and depiction of selective miRNAs family, one of the key fundamental points is to recognize and in-depth analysis of the miRNA target-function qualities based on computational tools. Computational predictions have been widely applied to miRNA target identification connected to the gene-protein network function [7,8,9,10]. Knowledge of such gene regulation by selective regulatory miRNA provides direct or indirect mode of action along with it also played a significant role for developing new techniques to support the disease control of fishes . There are several momentous advantages of identifying the functional miRNAs, because it is accurate, appropriate, fast, and inexpensive compared to the others laboratory experimental method in fisheries biology [12,13,14].
Common carp (Cyprinus carpio) considered as vulnerable to extinction by the IUCN status, it has been intensively studied in terms of its physiology, development and disease resistance compassionate by gene-protein interaction network pathways. In addition, it is also considered as an alternative, persistent vertebrate fish model to zebrafish (Danio rerio) [15, 16].
Keeping in view to such particular cases a vital drive has been made for profound analysis and research centered on the miRNAs roles and regulation for gene-target function pathways specified focus to Common carp (Cyprinus carpio). Attention only given to the selected group of miRNA, which have a crucial regulatory, expression role in protein mediated signaling pathways.
microRNA biogenesis pathway
The biogenesis of miRNAs is a very systemize multistep progression that initiate in the nuclear part of the cell, following transcription and continues through the cytoplasmic space where finally the mature miRNA molecule execute its main function [17, 18]. In nucleus, pri-miRNA are cleaved and released its hairpin like structure precursor component miRNAs (pre-miRNAs) by the coordination with the microprocessor complex which is mainly consists of the RNase-III like enzyme, Drosha component and its other cofactors like DGCR8 . Subsequently the pre-miRNA is recognized by exportin-5 protein and transports to the cytoplasm for further processing. Exportin-5 is an individual protein from the karyopherin group of nucleocytoplasmic transportation factors that rely upon their cofactor viz. Ran protein for their catalytic activities [19, 20]. Within the cytoplasm, pre-miRNAs are subsequently processed into ~ 22 nts long miRNA duplexes by the cytoplasmic RNase-III like enzyme, Dicer and its cofactors processed with its catalytic partner Trans-activator RNA (tar)-binding protein (TRBP)  or PKR-activating protein (PACT) [5, 21]. As consequently, one strand of the duplex compound is joined to the RISC (RNA–induced silencing complex) and serves as an active mature miRNA. After that, the other strand also called the passenger strand of miRNA which is quickly degraded or occasionally loaded into the RISC as a functional miRNA component . RISC is the cytoplasmic effector unit of the miRNA pathway and contains a solitary stranded miRNA directing towards lead objective mRNAs . In this pathway argonaute protein family plays a very imperative role. Argonaute protein (AGO2) mediates RISC effects on mRNA targets directly and mainly involved in the repression or destabilization of mRNA [5, 6] (Fig. 1).
Identification of selective miRNA
The selected miRNA sequences of Cyprinus carpio were acquired from miRbase database (http://miRbase.org). On the other side the EST and GSS sequences of Cyprinus carpio were downloaded from NCBI database (http://www.ncbi.nlm.nih.gov). One miRNA viz. ccr-miR-6732 was identified in the EST database and 5 miRNAs family viz. ccr-miR-430a, ccr-miR-430b, ccr-miR-430c-3p, ccr-miR-365 and ccr-miR-2783 were collected in the GSS database, where rest 4 miRNA i.e. ccr-miR-1, ccr-miR-133, ccr-miR-206, ccr-miR-21 were repossess from the miRBase database [22,23,24,25,26]. The lengths of the identified mature miRNAs typically varied from 20-24 nts. All the collected Cyprinus carpio miRNA sequence considered and compiled as valid candidate after satisfying the basic formula of biogenesis and expression of the miRNAs.
(∆G) value calculation of reference miRNA sets
The ∆G value of selected miRNA sequences were calculated by the online program based server of OLIGO NUCLEOTIDE PROPERTIES CALCULATOR [27, 28]. Experimental evidences suggested that, higher ∆G value containing miRNA having the maximum boding force during the interaction with target mRNA sequences and low chances of loop formation. FASTA format of miRNA base sequences are used for the calculation of ∆G value. All the calculated ∆G values ranges between 22.9 to 29.4 kcal/mol (Table 1).
Minimum free energy calculation
Calculation of minimum free energy of selected miRNA sequences by the help of mfold Web Server . It is a supportive tool for nucleic acid folding and hybridization prediction. The folding temperature is fixed at 37 °C but the temperature varies from a certain range. Here, at first FASTA format sequence placed and result given the value of minimum free energy . In common carp the recognized miRNAs nucleotides mfe values were calculated, those ranges in between - 4.5 to1.5 kcal/mol (Table 1).
Target gene depiction
miRNA mainly involved in the diverse range of biological processes such as posttranscriptional regulation of targeted genes. In such case miRNA binds to the target mRNA that are typically located at the 3/−UTRs part leading to the transcriptional repression or transcript degradation . Total 10 number target gene sites are predicted in Cyprinus carpio. (Table 2) Many experimental and computational approaches have documented that most of the miRNAs largely effects to target transcription factors, signal transduction factors and development . Cyprinus carpio target gene characterizes by the collection of online data sources of NCBI webpage hosted a number of bioinformatics tools and services like EST, GSS along with an archive of microRNA sequences and annotations called miRBase Databases [31,32,33].
Impact on different gene targets regulated by microRNAs in Cyprinus carpio
miRNA have a broad variety of gene coded expression patterns in different protein targets of Cyprinus carpio. A descriptive depiction of all selected miRNAs involved in the various gene regulatory functions of Cyprinus carpio has been summarized in the Table 2. The real time miRNA expression in different gene targets is not only limited to specific function but also regulates many other genes in Cyprinus carpio. miRNA expression pattern suggests that the selected miRNAs have a distinct role in signal transduction, metabolism, development as well as growth of skeletal muscle in carp (Fig. 2).
miRNA associated with signal transduction
Signal transduction mainly controlled by Toll-like receptor 2 and G-protein coupled receptor kinase protein component. Specifically, ccr-miR-6732 and ccr-miR-430a involved in this process within carp. Toll-like Receptors (TLRs) are intimately related type I transmembrane proteins, which form the major Pattern Recognition Receptors (PRRs) to transducer the signals in response to microbial intruders such as bacteria, fungi, protozoa and virus [34, 35]. TLRs are evolutionary conserved sensors of pathogen associated molecular patterns. They identify microbes and activate the signaling pathways, initiation of immune system and inflammatory responses to result in removal of the invading pathogen . This primary immune resistance against foreign and hazardous material is also critical for mounting the appropriate acquired immune responses . However, extreme activation of these pathways may also disturb immune homeostasis leading to some disease such as autoimmune disease, chronic inflammatory diseases etc. Most of the endogenous TLR ligands are produced as danger signals during tissue injury and inflammation . Various methods are liable for the regulation of the TLR-signaling pathways. These include conformational changes, phosphorylation, physical interactions, ubiquitylation and proteasome–mediated degradation involving different regulatory molecules [39, 40]. Among the several regulatory molecules some selected miRNA involved in fine-tuning of the TLR-signaling pathways [41,42,43,44,45,46,47] and thus influence host innate defenses against the microbial pathogens . miR-6732 act as an important TLR-activated transcription factors in Common carp (Cyprinus carpio). It can sense the presence of pathogen derived nucleic acid not at the cell surface, but rather within the endosomal compartment of the cell. CD11b glycoprotein function as a negative regulator of the TLR signal pathway by engaging in direct crosstalk with the TLR cellular signaling pathway .TLR signaling is a tightly regulated process that mainly involve in posttranscriptional regulation. Parallel findings revealed that miRNA associated with positive and negative regulators of TLR signaling which may provide attractive therapeutic targets in infection and inflammation in fish biological process. G-protein couple receptor kinase constitutes a large protein family receptors, that detect molecule outside of the cell and activate internal signal transduction pathways which may cause the ultimately cellular responses occur [49, 50]. Another miRNA family ccr-miR-430a operates via G-protein pathway. This pathway form a gene encoded protein network that regulates the selected activities of metabolic enzymes, ion channels, transporters and associate to controlling a broad ranges of cellular processes which work together within the transcription, motility, contractility and secretary functions of the cells. These cellular processes also monitored many systemic functions in fish body such as embryonic development, gonadal development etc. . On the other hand miR-430a also controls the inflammation in fish body but inappropriate or prolonged inflammation is the chief reason of many diseases, for this purpose it is important to understand the physiological mechanisms that terminate inflammation in-vivo .
miRNA related to metabolism
ccr-miR-430b and ccr-miR-2783 plays a crucial role as key metabolic regulators in Cyprinus carpio. These two miRNAs mainly regulates Sodium-dependent Glucose co-transporter (SGLT) in common carp. SGLT are a family of glucose transporter found in the intestinal mucosa of the small intestine and proximal tubule of the nephron . They contribute to renal glucose absorption . SGLT molecules accumulating glucose components from intestinal part or kidney epithelial cells in against to the adverse concentration gradient and balancing the superior adjustment of metabolism pathways . Now the SGLT are saturated with the filtered glucose and glucose is never secreted by a healthy nephron .
miRNA associated with muscle development of carp
Muscle development is controlled by evolutionary conserved gene expression networks of transcription factors that categorize the expression of gene-protein interaction involved in regulating muscle growth and differentiation [8, 56]. These particular translation factors are controlled by the outflow of miRNAs, working as “on-off” switches . In Cyprinus carpio, a set of miRNAs i.e. ccr-miR-1, ccr-miR-133, ccr-miR-206 and ccr-miR-2783 play significant roles in skeletal muscle development. These muscle specific and highly expressed miRNAs mainly regulates multiple muscle-development-related genes and rhesus blood group-associated glycoprotein-C . In short, miR-1, miR-133 and miR-206 mainly expressed in heart, skeletal muscle, gut, eye and skin . Myogenesis is a very complex but precisely regulated developmental process and it mainly associated with the multiple muscle-development-related genes whose mal-regulation can cause many muscular dysfunction diseases in carp . The negative mfe value of ccr-miR-133 and ccr-miR-365 strongly suggested that they actively figure out the gene expression patterns in the muscle tissue in Cyprinus carpio and also controls sarcomeric actin protein organization [60, 61].
miRNA involved in preconditioning of skeletal myoblasts
In Cyprinus carpio preconditioning of skeletal myoblasts is controlled by ccr-miR-21 miRNA. It is ubiquitous small RNA which is vigorously involved in cellular responsiveness to different stimuli [62, 63]. miR-21 in skeletal myoblasts (MY) preconditioning via interleukin-11 (IL-11) induced extracellular signal regulated kinase 1/2 (Erk1/2)–signal transducers and activators of transcription-3 (Stat3) signaling . On the other side, Erk1/2 phosphorylated Stat3 to promote its transcriptional activity . The anti-apoptotic action of miR-21 also linked with multiple transcription factors including signal transducers and Stat3 . IL-11 is a non-glycosylated protein secreted by various cells together with bone marrow stromal cells and its activity related to the cell proliferation [65, 66]. Whereas the negative mfe value of miR-21 gives the complete knowledge about the key role of preconditioning-induced ccr-miR-21 family in protection of myoblasts (MY) via activation of Erk1/2 and Stat3 signaling pathway. So, preconditioning of stem and progenitor cells by miRs can be exploited to progress therapeutic effectiveness in the clinical settings in the field of fish biology .
miRNA acts as transcription factor
TNF-α found in several fish species, including the common carp (Cyprinus carpio) [67,68,69,70,71]. ccr-miR-430c-3p regulates TNF-α and function as the transcription factor. In Cyprinus carpio TNF-α primes but does not directly trigger phagocytes and thereby promotes phagocyte activation indirectly via stimulation of endothelial cells . It also regulates host-pathogen interactions and is necessary for protective immunity against intracellular bacteria and fungi but also aligned with intracellular and extracellular protozoan parasites [73, 74]. Here also, membrane bound TNF-α participate in several biological activities as well as control the microbial infection [75,76,77]. At present, most of the carp are infected by Trypanosoma borreli and leads to increased mortality in Cyprinus carpio [78,79,80]. It is mainly due to the inhibition of TNF-α gene expression and moreover, used an inhibitor of TNF-α converting enzyme (TACE) to figure out the contribution of mTNF-α to the clearance of parasite within few days in infected carp .
The computational approaches for identifying selected miRNAs and their specific target performed crucial role in consideration of gene regulation at post-transcriptional level of Cyprinus carpio. Such findings will be wonderfully helpful to reveal and find out the importance of gene-protein regulation for developing new techniques towards disease control along with the contemporary drug delivery system. Moreover, modern gene silencing technology will be supportive for somatic development of fishes. Dysregulation of miRNAs may alter the gene protein interaction networks in case of several diseases, like metabolic abnormalities, neurodegenerative disorder etc.; in complementary the miRNA therapy could might be restore the gene expression within the cells to reverse back into normal cellular functioning state. Besides that, their improper function may be the prime object for improvement of potential remedial, which focus for treating different syndromes. Moreover, a single, short miRNA can object single or multiple mRNA gene targets within a cell. Although, difficulty of miRNA-mRNA interactions, accurate detection methodologies and numerous technical difficulties has been arises especially in-vivo system. There are such a large number of favorable circumstances of miRNAs as restorative perspective; for example, miRNAs are little size nucleotide contains a known grouping which is regularly saved among species, an attractive feature from a drug improvement perspective. It indicates that the target relationships between miRNAs and mRNAs and their ultimate effect in fishes are very broad and valuable. The use of miRNA as the future targeted therapy is too bright, promising and spontaneous at current scenario. However, with rapidly growing number of miRNA discoveries since more than last 10 years, is definitely encouraging and hopeful. Therefore, more scientific studies are needed in this direction to understand the each and every step of miRNA-controlled protein-gene network pathway. Even though, Cyprinus carpio miRNAs identified and characterized in this research work will definitely provide new opportunities for future genome research in common carp and other fish species. This finding will definitely provide useful, significant information to the researchers and can play an important role in bridging the research gap between aquaculturist and bioinformatics.
Basic local alignment search tool
Cluster of differentiation molecule 11B
Digeorge syndrome chromosomal [OR CRITICAL] region 8
Extracellular signal regulated kinase 1/2
Expressed sequence tag
G protein–coupled receptors
Genome survey sequences
International union for conservation of nature
Minimum folding free energies
Minimum energy fold
Micro RNA base registry
Membrane bound TNF-α
National center for biotechnology information
Precursor micro RNA
Primary micro RNA
Pattern recognition receptors
- Ran :
Ras-related nuclear protein
RNA-induced silencing complex
- RNase III:
Sodium-dependent glucose co-transporter
- STAT3 :
Signal transducer and activator of transcription 3
TNF-α converting enzyme
Tumor necrosis factor α
Trans-activator RNA (TAR)-binding protein
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The authors would like to thank the Science and Engineering Research Board, Department of Science and Technology, Govt. of India for financial assistance to carry out the research work (Project file No Ref. No. PDF/2016/001776).
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Ghosh, S., Bhattacharya, M., Kar, A. et al. Molecular signature of selective microRNAs in Cyprinus carpio (Linnaeus 1758):a computational approach. ExRNA 1, 11 (2019). https://doi.org/10.1186/s41544-019-0010-4
- Cyprinus carpio
- Target protein
- Gene function