| THEMIS | |||||||||||||||||||||||||||||||||||||||||||||||||||
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| Identifiers | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Aliases | THEMIS , C6orf190, C6orf207, GASP, SPOT, TSEPA, bA325O24.3, bA325O24.4, thymocyte selection associated | ||||||||||||||||||||||||||||||||||||||||||||||||||
| External IDs | OMIM: 613607 MGI: 2443552 HomoloGene: 72287 GeneCards: THEMIS | ||||||||||||||||||||||||||||||||||||||||||||||||||
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| Wikidata | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Protein THEMIS is a protein encoded by the eponymous THEMIS gene. [5] [6] [7]
This protein plays a regulatory role in both positive and negative T cell selection during late thymocyte development. The protein functions through T-cell antigen receptor signaling, and is necessary for proper lineage commitment and maturation of T-cells. [8] Changes in THEMIS gene expression due to the rs138300818 variant promote the development of early-onset type 1 diabetes. [9]
THEMIS is an acronym for thymocyte-expressed-molecule. Themis is also the name of a Titan in Greek mythology who weighed the fates of humans, an apt choice since the protein is important in deciding the fate of the T cell during development. [10]
Cytotoxic T-lymphocyte associated protein 4, (CTLA-4) also known as CD152, is a protein receptor that functions as an immune checkpoint and downregulates immune responses. CTLA-4 is constitutively expressed in regulatory T cells but only upregulated in conventional T cells after activation – a phenomenon which is particularly notable in cancers. It acts as an "off" switch when bound to CD80 or CD86 on the surface of antigen-presenting cells. It is encoded by the gene CTLA4 in humans.
The autoimmune regulator (AIRE) is a protein that in humans is encoded by the AIRE gene. It is a 13kb gene on chromosome 21q22.3 that has 545 amino acids. AIRE is a transcription factor expressed in the medulla of the thymus. It is part of the mechanism which eliminates self-reactive T cells that would cause autoimmune disease. It exposes T cells to normal, healthy proteins from all parts of the body, and T cells that react to those proteins are destroyed.
C-C chemokine receptor type 7 is a protein that in humans is encoded by the CCR7 gene. Two ligands have been identified for this receptor: the chemokines ligand 19 (CCL19/ELC) and ligand 21 (CCL21). The ligands have similar affinity for the receptor, though CCL19 has been shown to induce internalisation of CCR7 and desensitisation of the cell to CCL19/CCL21 signals. CCR7 is a transmembrane protein with 7 transmembrane domains, which is coupled with heterotrimeric G proteins, which transduce the signal downstream through various signalling cascades. The main function of the receptor is to guide immune cells to immune organs by detecting specific chemokines, which these tissues secrete.
CD83 is a human protein encoded by the CD83 gene.
G-protein coupled receptor 183 also known as Epstein-Barr virus-induced G-protein coupled receptor 2 (EBI2) is a protein (GPCR) expressed on the surface of some immune cells, namely B cells and T cells; in humans it is encoded by the GPR183 gene. Expression of EBI2 is one critical mediator of immune cell localization within lymph nodes, responsible in part for the coordination of B cell, T cell, and dendritic cell movement and interaction following antigen exposure. EBI2 is a receptor for oxysterols. The most potent activator is 7α,25-dihydroxycholesterol (7α,25-OHC), with other oxysterols exhibiting varying affinities for the receptor. Oxysterol gradients drive chemotaxis, attracting the EBI2-expressing cells to locations of high ligand concentration. The GPR183 gene was identified due to its upregulation during Epstein-Barr virus infection of the Burkitt's lymphoma cell line BL41, hence its name: EBI2.
CD3e molecule, epsilon also known as CD3E is a polypeptide which in humans is encoded by the CD3E gene which resides on chromosome 11.
Protein tyrosine phosphatase non-receptor type 22 (PTPN22) is a cytoplasmatic protein encoded by gene PTPN22 and a member of PEST family of protein tyrosine phosphatases. This protein is also called "PEST-domain Enriched Phosphatase" ("PEP") or "Lymphoid phosphatase" ("LYP"). The name LYP is used strictly for the human protein encoded by PTPN22, but the name PEP is used only for its mouse homolog. However, both proteins have similar biological functions and show 70% identity in amino acid sequence. PTPN22 functions as a negative regulator of T cell receptor (TCR) signaling, which maintains homeostasis of T cell compartment.
B-cell maturation antigen, also known as tumor necrosis factor receptor superfamily member 17 (TNFRSF17), is a protein that in humans is encoded by the TNFRSF17 gene.
Transcription factor 7 is the gene that in humans encodes for the TCF1 protein.
Cluster of Differentiation 276 (CD276) or B7 Homolog 3 (B7-H3) is a human protein encoded by the CD276 gene.
60S ribosomal protein L10a is a protein that in humans is encoded by the RPL10A gene.
Major histocompatibility complex class I-related gene protein (MR1) is a non-classical MHC class I protein, that binds vitamine metabolites produced in certain types of bacteria. MR1 interacts with mucosal associated invariant T cells (MAIT).
CD205 also called Lymphocyte antigen 75 is a protein that in humans is encoded by the LY75 gene.
Cleft lip and palate transmembrane protein 1 (Clptm1) is a multi-transmembrane protein that in humans is encoded by the CLPTM1 gene. Clptm1 was characterized in 1995 as a surface membrane protein in the thymus during embryonic development in mice and is suggested to have an important role in T-cell development. A more recent study shows a role in GABAA receptor subunit intracellular anchoring and regulation resulting in an influence on synaptic strength Clptm1 belongs to a family of several eukaryotic cleft lip and palate transmembrane protein 1 sequences.
Peptidyl-prolyl cis-trans isomerase-like 4 is an enzyme that in humans is encoded by the PPIL4 gene.
CD1a is a human protein encoded by the CD1A gene.
Thymocyte selection-associated high mobility group box protein TOX is a protein that in humans is encoded by the TOX gene. TOX drives T-cell exhaustion and plays a role in innate lymphoid cell development.
Thymus-specific serine protease is an enzyme that in humans is encoded by the PRSS16 gene.
CD96 or Tactile is a protein that in humans is encoded by the CD96 gene. CD96 is a receptor protein which is expressed on T cells and NK cells and shares sequence similarity with CD226. The protein encoded by this gene belongs to the immunoglobulin superfamily. It is a type I membrane protein. The protein may play a role in the adhesion of activated T and NK cells to their target cells during the late phase of the immune response. It may also function in antigen presentation. Alternative splicing occurs at this locus and two transcript variants encoding distinct isoforms have been identified. CD96 is a transmembrane glycoprotein that has three extracellular immunoglobulin-like domains and is expressed by all resting human and mouse NK cells. CD96 main ligand is CD155. CD 96 has approximately 20% homology with CD226 and competed for binding to CD155 with CD226.
T-cell surface glycoprotein CD1b is a protein that in humans is encoded by the CD1B gene.
This article incorporates text from the United States National Library of Medicine, which is in the public domain.
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