Biological communication is a core component of biological systems, mainly presented in the form of evolution, transmitting information from a generation to the next. Unfortunately, biological systems also include other components and functionalities that would cause unwanted information processing and/or communication problems that manifest as diseases.
On the other hand, general communication systems, e.g. digital communications, have been well developed and analysed to yield accuracy, high performance, and efficiency. Therefore, we extend the theories of digital communication systems to analyse biological communications. However, in order to accurately model biological communication as digital ones, an analysis of the analogies between both systems is essential. In this work, we propose a novel stacked-layer network model that presents gene expression (i.e. the process by which the information carried by deoxyribonucleic acid or DNA is transformed into the appropriate proteins) and the role of the Golgi apparatus in transmitting these proteins to a target organ. This is analogous to the transmit process in digital communications where a transmitting device in some network would send digital information to a destination/receiver device in another network through a router.
The proposed stacked-layer network model exploits key networks’ theories and applies them into the broad field genomic analysis, which in turn can impact our understanding and use of medical methods. For example, it would be useful in detecting a target site (e.g. tumour cells) for drug therapy, improving the targeting accuracy (addressing), and reducing side effects in patients from health and socio-economic perspectives.
Besides improving our understanding of biological communication systems, the proposed model unleashes the true duality between digital and biological communication systems. Therefore, it could be deployed into leveraging the advantages and efficiencies of biological systems into digital communication systems as well and to further develop efficient models that would overcome the disadvantages of either system.
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This study has not explicit funding; it was made through a scholarship given to Ph.D. Student Yesenia Cevallos by National University of Chimborazo of Ecuador.
Conflict of Interest
Yesenia Cevallos, Lorena Molina, Alex Santillán, Floriano De Rango, Ahmad Rushdi and Jesús B. Alonso declare that they have no conflict of interest.
Informed consent was not required as no human or animals were involved.
Human and Animal Rights
This article does not contain any studies with human participants performed by any of the authors.
Glossary: Cell Biology
Glossary: Cell Biology
The direction of nucleic acid synthesis such that the 5′ phosphate of ribose or deoxyribose is joined to the 3′ hydroxyl of the immediately preceding ribose or deoxyribose in a growing RNA or DNA chain. When a single strand is written, the 5′ end of the molecule is conventionally written on the left and the 3′ end is written on the right
- Active transport:
Transport of a substance across a membrane that does not rely on the potential energy of a concentration gradient for the substance being transported and therefore requires an additional energy source (often ATP)
- Amino acid:
A chemical building block of proteins. There are 20 standard amino acids. A protein consists of a specific sequence of amino acids
- Aminoacyl (A) site:
A binding site on a ribosome that accepts the incoming aminoacyl-tRNA
A “triplet” of three nucleotides in a transfer RNA (tRNA) that is complementary to a codon in a messenger RNA (mRNA). During protein synthesis, base pairing between a codon and anticodon aligns the incoming tRNA carrying the new amino acid with the tRNA carrying the growing peptide chain
- ATP, adenosine triphosphate:
The major source of energy for biochemical reactions in all organisms
- Calcium signalling:
Signal transduction mechanisms whereby calcium mobilization (from outside the cell or from intracellular storage pools) to the cytoplasm is triggered by external stimuli. Calcium signals are often seen to propagate as waves, oscillations, spikes, sparks, or puffs. The calcium acts as an intracellular messenger by activating calcium-responsive proteins
Covalent modification of mRNA at the 5′ end where a modified guanidine is covalently attached in a 5′–3′ linkage
Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which encodes heritable information for the maintenance of life; and the cytoplasm, a heterogeneous assemblage of ions, molecules, and fluid
- Cell membrane:
The outer membrane of a cell, which separates it from the environment. Also called a plasma membrane or plasma lemma
The movement of a cell towards or away from the source of a chemical
A cellular structure containing genes. Excluding sperm and egg cells, humans have 46 chromosomes (23 pairs) in each cell
A trinucleotide (triplet, or three-word) that specifies an amino acid or stop when parsed by the translation apparatus. The codons in mRNA molecules base pair with the anticodons of the cognate tRNAs during protein synthesis
All the contents of a cell, including the plasma membrane, but not including the nucleus
Integrated system of molecules within eukaryotic cells which provides them with shape, internal spatial organization, motility, and may assist in communication with other cells and the environment. Red blood cells, for instance, would be spherical instead of flat if it were not for their cytoskeleton
The semi-fluid portion of the cytoplasm, excluding the organelles. The cytosol is a concentrated solution of proteins, salts, and other molecules
- DNA, deoxyribonucleic acid:
The substance of heredity. A long, helical, double-stranded molecule that carries the cell’s genetic information
Member of a family of ATP− powered motor proteins that move towards the (−) end of microtubules by sequentially breaking and forming new bonds with microtubule proteins.
- Embryonic stem cell:
A cell found in early embryos that can renew itself and differentiate into the many cell types that are found in the human body
- Endocrine system:
A network of glands distributed throughout the body forms the endocrine system. These glands produce hormones that are released into the circulation and distributed to distant target sites via the blood. Hormones produced by these glands act as chemical messengers to control body functions such as growth, metabolism, sexual development, and egg and sperm production
A regulatory sequence in eukaryotic DNA that may be located at a great distance from the gene it controls. Binding of specific proteins to an enhancer modulates the rate of transcription of the associated gene
A protein that speeds up a specific chemical reaction without being permanently altered or consumed
- ER, endoplasmic reticulum:
Network of membranes in eukaryotic cells which helps in control of protein synthesis and cellular organization
An organism whose cells have cytoskeletons for support and their DNA contained in a nucleus, separated from the other contents of the cell
- Exit (E) site:
The tRNA-binding site on the ribosome that binds each uncharged tRNA just prior to its release
- Fick’s first law:
An observed law stating that the rate at which one substance diffuses through another is directly proportional to the concentration gradient of the diffusing substance
- Fick’s second law:
Is used in non-steady state diffusion, i.e. when the concentration within the diffusion volume changes with respect to time
- GA, golgi apparatus:
Eukaryotic organelle which package cell products, such as enzymes and hormones, and coordinate their transport to the outside of the cell
- Gap junctions:
Channel formed by proteins that allows ions and other molecules to pass between adjacent cells
A unit of heredity; a segment of DNA that contains the code for making a specific protein or RNA molecule
- Guanyl transferase:
Guanylyl transferase is a capping enzyme complex. Guanylyl transferase is used to label either 5’ di- and triphosphate ends of RNA molecules, or capped 5’ ends of RNA after chemical removal of the terminal 7-methyl-guanosine residue
A molecule that stimulates specific cellular activity; made in one part of the body and transported via the bloodstream to tissues and organs. Examples include insulin, oestrogen, and testosterone
Reaction in which a covalent bond is cleaved with addition of an H from water to one product of the cleavage and of an OH from water to the other
Part of a primary transcript (or the DNA from which it is transcribed). The intron is removed during RNA processing (splicing) and is not found in the mature, functional RNA
Member of a family of motor proteins that use energy released by ATP hydrolysis to move towards the (+) end of a microtubule, transporting vesicles or particles in the process
- Law mass action:
The law stating that the rate of any given chemical reaction is proportional to the product of the activities (or concentrations) of the reactants
A substance that is able to bind to and form a complex with a biomolecule to serve a biological purpose
The addition of a methyl group (–CH3) to a molecule, most commonly in the context of DNA where cytosine and, less often, adenine residues can be modified in this way, sometimes resulting in a change in transcription
Part of the cytoskeleton; a strong, hollow fibre that acts as a structural support for the cell. Microtubules also serve as tracks for transporting vesicles and give structure to flagella and cilia
- Motor protein:
Any member of a special class of enzymes that use energy from ATP hydrolysis to walk or slide along a microfilament (myosin) or a microtubule (dynein and kinesin)
The most common protein in muscle cells, responsible for the elastic and contractile properties of muscle
A monomer unit of nucleic acid, consisting of a purine or pyrimidine base, a sugar molecule (ribose or deoxyribose), and phosphate group (s)
Membrane-bound organelle which contains the DNA in the form of chromosomes. It is the site of DNA replication, and the site of RNA synthesis
A specialized, membrane-bounded structure that has a specific function in a cell. Examples include the nucleus, Golgi, ER
- Passive transport:
A kind of transport by which ions or molecules move along a concentration gradient, which means movement from an area of higher concentration to an area of lower concentration
A chemical secreted by an animal, especially an insect, that influences the behaviour or physiology of others of the same species, as by attracting members of the opposite sex or marking the route to a food source
A natural or synthetic compound containing two or more amino acids linked together by peptide bonds
- Peptidyl (P) site:
The binding site on a ribosome that contains the tRNA attached to the growing polypeptide chain
DNA synthesis uses 5′ nucleotide triphosphates as precursor and proceeds by linking the 5′ triphosphate of the incoming nucleotide to the 3′OH of the growing chain. Hence DNA strands have polarity i.e. a 5′ and a 3′ end
A linear polymer of amino acids held together by peptide linkages
- Poly (A) polymerase:
An enzyme that adds consecutive adenosines to the 3′ termini of eukaryotic mRNAs to generate poly (A) tails
A piece of genetic material that acts as a gene switch, so that a gene can become expressed in the cell. It is the region at which the RNA polymerase binds to start transcription. Most promoters are located upstream of the gene, except that some eukaryotic genes have promoters internal to the gene
A molecule composed of amino acids lined up in a precise order determined by a gene, then folded into a specific three-dimensional shape. Proteins are responsible for countless biological functions and come in a wide range of shapes and sizes
- Random walk:
It is no directional drift of information molecules and no chemical reaction of information molecules during propagation. Random walk is the most fundamental mechanism that molecular communication relies on to propagate a molecule. Random walk does not require any additional mechanism to propagate a molecule
- Random walk with chemical reactions by amplifiers:
Amplifiers in the environment can increase the reliability of molecular propagation by increasing the number of propagating information molecules. Amplifiers are located in the environment and react with molecules that propagate in the environment. As a result, amplifiers produce a copy of the molecule which propagates in the environment. This class of molecular communication may be enabled by exploiting protein molecules such as those responsible for amplifying calcium ions
- Random walk with drift:
Information molecules may undergo a directional drift which continuously propagates molecules in the direction of the drift. An example of this class of molecular communication is found in our body. Cells in the body secrete hormonal substances which circulate with the flow of the blood stream and propagate to distant target cells distributed throughout the body
A molecular complex in which proteins are made. In eukaryotic cells, ribosomes either are free in the cytoplasm or are attached to the rough endoplasmic reticulum
- RRNA, ribonucleic acid:
A molecule very similar to DNA that plays a key role in making proteins. There are three main types: messenger RNA (mRNA) is an RNA version of a gene and serves as a template for making a protein, ribosomal RNA (rRNA) is a major component of ribosomes, and transfer RNA (tRNA) transports amino acids to the ribosome and helps position them properly during protein production
- RNA polymerase:
An enzyme that makes RNA using DNA as a template in a process called transcription
- RNA splicing:
A process that results in the precise cutting of RNA, removal of introns to produce a fully functional RNA
- SRP, signal recognition particle:
Protein–RNA complex that binds to signal sequences and targets polypeptide chains to the endoplasmic reticulum
- Start codon:
The mRNA triplet (AUG) that is recognized by the ribosome as a signal for the start of translation
- Stop codons:
One of three codons in mRNA (UAG, UGA, UAA) that function as signals for the termination of translation by ribosomes
The process of copying information from genes (made of DNA) into messenger RNA
The process of making proteins based on genetic information encoded in messenger RNA. Translation occurs in ribosomes
A small, membrane-bounded sac that transports substances between organelles as well as to and from the cell membrane
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Cite this article
Cevallos, Y., Molina, L., Santillán, A. et al. A Digital Communication Analysis of Gene Expression of Proteins in Biological Systems: A Layered Network Model View. Cogn Comput 9, 43–67 (2017). https://doi.org/10.1007/s12559-016-9434-4
- Digital communication
- Gene expression
- Biological communication
- Layered network model
- Medical applications