Page last updated: 2024-10-24

neuron fate specification

Definition

Target type: biologicalprocess

The process in which a cell becomes capable of differentiating autonomously into a neuron in an environment that is neutral with respect to the developmental pathway. Upon specification, the cell fate can be reversed. [GOC:dph]

Neuron fate specification is a complex and precisely regulated process that ensures the development of functional and diverse neuronal populations within the nervous system. This intricate process involves a series of molecular events that govern the commitment of neural progenitor cells to specific neuronal fates. These events include:

1. **Induction of Neuroectoderm:** The initial step involves the induction of neuroectoderm from the ectoderm. This is achieved through signaling molecules like fibroblast growth factors (FGFs) and Wnt proteins, which activate downstream transcription factors that specify the neural lineage.
2. **Neural Progenitor Cell Specification:** Once neuroectoderm is established, neural progenitor cells (NPCs) are generated. NPCs are multipotent cells with the capacity to generate various neuronal and glial cell types. Signaling pathways, including Notch and Shh, play crucial roles in regulating NPC proliferation and differentiation.
3. **Neurogenesis:** NPCs undergo a process called neurogenesis, which involves the sequential commitment of NPCs to neuronal lineages. This commitment is driven by a combination of intrinsic factors, such as transcription factors and microRNAs, and extrinsic cues, such as secreted molecules from surrounding cells.
4. **Neuron Type Specification:** After neurogenesis, neurons undergo further differentiation and specialization into various neuronal subtypes, each possessing distinct morphological, molecular, and functional characteristics. This specification is orchestrated by a complex interplay of transcription factors, signaling pathways, and neuronal activity.

**Key Molecular Players in Neuron Fate Specification:**

* **Transcription Factors:** These proteins bind to specific DNA sequences, regulating gene expression and influencing neuronal cell fate. Examples include Pax6, Sox1, Mash1, and NeuroD1.
* **Signaling Pathways:** These molecular cascades transduce extracellular signals into intracellular responses, influencing cell fate decisions. Examples include Notch, Wnt, Shh, and BMP signaling.
* **MicroRNAs:** These small non-coding RNAs regulate gene expression at the post-transcriptional level, fine-tuning neuronal differentiation.

**Factors Influencing Neuron Fate Specification:**

* **Genetic Pre-programming:** The genetic makeup of the individual contributes significantly to neuronal fate determination.
* **Environmental Factors:** The environment in which neurons develop, including cell-cell interactions and the presence of growth factors, influences neuronal fate specification.
* **Neuronal Activity:** Electrical activity and synaptic communication play essential roles in shaping neuronal circuitry and influencing the survival and maturation of neurons.

**Disruptions in Neuron Fate Specification:**

Errors in the complex process of neuron fate specification can lead to neurodevelopmental disorders, such as autism spectrum disorders, epilepsy, and intellectual disability. These disorders often arise from mutations in genes encoding critical molecular players involved in neuronal fate determination.

**Research and Therapeutic Implications:**

Understanding the intricate mechanisms governing neuron fate specification is crucial for developing novel therapies for neurodevelopmental disorders and neurological conditions. Efforts are underway to identify and manipulate key molecular players involved in this process, with the aim of promoting neuronal regeneration and repair.'
"

Proteins (1)

ProteinDefinitionTaxonomy
Histone-lysine N-methyltransferase EHMT2A histone-lysine N-methyltransferase, H3 lysine-9 specific 3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q96KQ7]Homo sapiens (human)

Compounds (32)

CompoundDefinitionClassesRoles
disulfiramorganic disulfide;
organosulfur acaricide
angiogenesis inhibitor;
antineoplastic agent;
apoptosis inducer;
EC 1.2.1.3 [aldehyde dehydrogenase (NAD(+))] inhibitor;
EC 3.1.1.1 (carboxylesterase) inhibitor;
EC 3.1.1.8 (cholinesterase) inhibitor;
EC 5.99.1.2 (DNA topoisomerase) inhibitor;
ferroptosis inducer;
fungicide;
NF-kappaB inhibitor
ebselenebselen : A benzoselenazole that is 1,2-benzoselenazol-3-one carrying an additional phenyl substituent at position 2. Acts as a mimic of glutathione peroxidase.benzoselenazoleanti-inflammatory drug;
antibacterial agent;
anticoronaviral agent;
antifungal agent;
antineoplastic agent;
antioxidant;
apoptosis inducer;
EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor;
EC 1.13.11.34 (arachidonate 5-lipoxygenase) inhibitor;
EC 1.3.1.8 [acyl-CoA dehydrogenase (NADP(+))] inhibitor;
EC 1.8.1.12 (trypanothione-disulfide reductase) inhibitor;
EC 2.5.1.7 (UDP-N-acetylglucosamine 1-carboxyvinyltransferase) inhibitor;
EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor;
EC 3.1.3.25 (inositol-phosphate phosphatase) inhibitor;
EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor;
EC 3.5.4.1 (cytosine deaminase) inhibitor;
EC 5.1.3.2 (UDP-glucose 4-epimerase) inhibitor;
enzyme mimic;
ferroptosis inhibitor;
genotoxin;
hepatoprotective agent;
neuroprotective agent;
radical scavenger
vorinostatvorinostat : A dicarboxylic acid diamide comprising suberic (octanedioic) acid coupled to aniline and hydroxylamine. A histone deacetylase inhibitor, it is marketed under the name Zolinza for the treatment of cutaneous T cell lymphoma (CTCL).

Vorinostat: A hydroxamic acid and anilide derivative that acts as a HISTONE DEACETYLASE inhibitor. It is used in the treatment of CUTANEOUS T-CELL LYMPHOMA and SEZARY SYNDROME.
dicarboxylic acid diamide;
hydroxamic acid
antineoplastic agent;
apoptosis inducer;
EC 3.5.1.98 (histone deacetylase) inhibitor
thiramthiram : An organic disulfide that results from the formal oxidative dimerisation of N,N-dimethyldithiocarbamic acid. It is widely used as a fungicidal seed treatment.

Thiram: A dithiocarbamate chemical, used commercially in the rubber processing industry and as a fungicide. In vivo studies indicate that it inactivates the enzyme GLUTATHIONE REDUCTASE. It has mutagenic activity and may induce chromosomal aberrations.
organic disulfideantibacterial drug;
antifungal agrochemical;
antiseptic drug
cystamine dihydrochloride
cysteaminecysteamine : An amine that consists of an ethane skeleton substituted with a thiol group at C-1 and an amino group at C-2.

Cysteamine: A mercaptoethylamine compound that is endogenously derived from the COENZYME A degradative pathway. The fact that cysteamine is readily transported into LYSOSOMES where it reacts with CYSTINE to form cysteine-cysteamine disulfide and CYSTEINE has led to its use in CYSTINE DEPLETING AGENTS for the treatment of CYSTINOSIS.
amine;
thiol
geroprotector;
human metabolite;
mouse metabolite;
radiation protective agent
gliotoxingliotoxin : A pyrazinoindole with a disulfide bridge spanning a dioxo-substituted pyrazine ring; mycotoxin produced by several species of fungi.

Gliotoxin: A fungal toxin produced by various species of Trichoderma, Gladiocladium fimbriatum, Aspergillus fumigatus, and Penicillium. It is used as an immunosuppressive agent.
dipeptide;
organic disulfide;
organic heterotetracyclic compound;
pyrazinoindole
antifungal agent;
EC 2.5.1.58 (protein farnesyltransferase) inhibitor;
immunosuppressive agent;
mycotoxin;
proteasome inhibitor
9,10-anthraquinone9,10-anthraquinone : An anthraquinone that is anthracene in which positions 9 and 10 have been oxidised to carbonyls.anthraquinone
1,4-naphthoquinone1,4-naphthoquinone : The parent structure of the family of 1,4-naphthoquinones, in which the oxo groups of the quinone moiety are at positions 1 and 4 of the naphthalene ring. Derivatives have pharmacological properties.

naphthoquinone : A polycyclic aromatic ketone metabolite of naphthalene.
1,4-naphthoquinones
azacitidine5-azacytidine : An N-glycosyl-1,3,5-triazine that is 4-amino-1,3,5-triazin-2(1H)-one substituted by a beta-D-ribofuranosyl residue via an N-glycosidic linkage. An antineoplastic agent, it is used in the treatment of myeloid leukaemia.

Azacitidine: A pyrimidine analogue that inhibits DNA methyltransferase, impairing DNA methylation. It is also an antimetabolite of cytidine, incorporated primarily into RNA. Azacytidine has been used as an antineoplastic agent.
N-glycosyl-1,3,5-triazine;
nucleoside analogue
antineoplastic agent
ninhydrinninhydrin : A member of the class of indanones that is indane-1,3-dione bearing two additional hydroxy substituents at position 2.

Ninhydrin: 2,2-Dihydroxy-1H-indene-1,3-(2H)-dione. Reagent toxic to skin and mucus membranes. It is used in chemical assay for peptide bonds, i.e., protein determinations and has radiosensitizing properties.
aromatic ketone;
beta-diketone;
indanones;
ketone hydrate
colour indicator;
human metabolite
diphenyldiselenidediphenyldiselenide: structure given in first source
benzeneseleninic acidbenzeneseleninic acid: structure given in first source
sodium selenatesodium selenate : An inorganic sodium salt having selenate as the counterion.inorganic sodium saltanticonvulsant;
EC 3.1.3.48 (protein-tyrosine-phosphatase) inhibitor;
fertilizer
2,2'-dipyridyl disulfide2,2'-dipyridyl disulfide: disulfide is an important moiety in this cpd

aldrithiol : A member of the class of pyridines that is pyridine which is substituted by a pyridin-2-yldisulfanediyl group at position 2. It is a reagent used in molecular biology as an oxidizing agent. Also used in peptide synthesis and for detecting thiols.
organic disulfide;
pyridines
oxidising agent
glutathione disulfideGlutathione Disulfide: A GLUTATHIONE dimer formed by a disulfide bond between the cysteine sulfhydryl side chains during the course of being oxidized.glutathione derivative;
organic disulfide
Escherichia coli metabolite;
mouse metabolite
sinefunginadenosines;
non-proteinogenic alpha-amino acid
antifungal agent;
antimicrobial agent
bisdethiobis(methylthio)gliotoxinbisdethiobis(methylthio)gliotoxin: structure given in first source; a platelet activating factor antagonist
s-adenosylhomocysteineS-adenosyl-L-homocysteine : An organic sulfide that is the S-adenosyl derivative of L-homocysteine.

S-Adenosylhomocysteine: 5'-S-(3-Amino-3-carboxypropyl)-5'-thioadenosine. Formed from S-adenosylmethionine after transmethylation reactions.
adenosines;
amino acid zwitterion;
homocysteine derivative;
homocysteines;
organic sulfide
cofactor;
EC 2.1.1.72 [site-specific DNA-methyltransferase (adenine-specific)] inhibitor;
EC 2.1.1.79 (cyclopropane-fatty-acyl-phospholipid synthase) inhibitor;
epitope;
fundamental metabolite
decitabine2'-deoxyribonucleoside
ditiocarb sodiumorganic molecular entity
verticillinsverticillins: 3 antibiotics isolated from imperfect fungus Verticillium: verticillin A, verticillin B (mono-3-hydroxymethyl analog of verticillin A), & verticillin C (differs from verticillin B in that 1 of dioxopiperazine rings has a trisulfide rather than a disulfide bridge; active against gram-positive bacteria & mycobacteria but not against gram-negative bacteria & fungi; RN given refers to cpd with unknown MF; structure (verticillins A & B))
azodicarbonamideorganic molecular entity
chetomin
sgi-1027SGI-1027: inhibits DNA methyltransferase 1; structure in first source
bix 01294piperidines
unc 0638UNC 0638: inhibits lysine methyltransferases G9a and GLP; structure in first sourcequinazolines
unc 03217-(2-(2-(dimethylamino)ethoxy)ethoxy)-6-methoxy-2-(4-methyl-1,4-diazepan-1-yl)-N-(1-methylpiperidin-4-yl)quinazolin-4-amine: a G9a antagonist; structure in first sourcequinazolines
unc 0631N-(1-(cyclohexylmethyl)piperidin-4-yl)-2-(4-isopropyl-1,4-diazepan-1-yl)-6-methoxy-7-(3-(piperidin-1-yl)propoxy)quinazolin-4-amine: inhibits protein lysine methyltransferase G9a; structure in first source
gsk343GSK343 : A member of the class of indazoles that is 1-isopropyl-1H-indazole-4-carboxamide in which the nitrogen of the carboxamide group is substituted by a (6-methyl-2-oxo-4-propyl-1,2-dihydropyridin-3-yl)methyl group and in which the indazole ring is substituted at position 6 by a 2-(4-methylpiperazin-1-yl)pyridin-4-yl group. A highly potent and selective EZH2 inhibitor (IC50 = 4 nM).

GSK343: an EZH2 methyltransferase inhibitor
aminopyridine;
indazoles;
N-alkylpiperazine;
N-arylpiperazine;
pyridone;
secondary carboxamide
antineoplastic agent;
apoptosis inducer;
EC 2.1.1.43 (enhancer of zeste homolog 2) inhibitor
brd4770benzimidazoles
6,7-dimethoxy-2-(pyrrolidin-1-yl)-n-(5-(pyrrolidin-1-yl)pentyl)quinazolin-4-amine6,7-dimethoxy-2-(pyrrolidin-1-yl)-N-(5-(pyrrolidin-1-yl)pentyl)quinazolin-4-amine: a SETD8 inhibitor; structure in first source