RET proto-oncogene

RET
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 2IVS, 2IVT, 2IVU, 2IVV, 2X2K, 2X2L, 2X2M, 2X2U, 4CKI, 4CKJ, 4UX8, 5AMN
Identifiers
Aliases	RET, Ret, PTC, RET51, RET9, c-Ret, CDHF12, CDHR16, HSCR1, MEN2A, MEN2B, MTC1, RET-ELE1, ret proto-oncogene
External IDs	OMIM: 164761 MGI: 97902 HomoloGene: 7517 GeneCards: RET
Gene location (Human) Chr. Chromosome 10 (human)[1] Band 10q11.21 Start 43,077,064 bp[1] End 43,130,351 bp[1]
Gene location (Mouse) Chr. Chromosome 6 (mouse)[2] Band 6 F1|6 55.86 cM Start 118,128,706 bp[2] End 118,174,679 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in spinal ganglia trigeminal ganglion pons tibialis anterior muscle superior vestibular nucleus parotid gland cerebellar vermis prefrontal cortex hypothalamus right adrenal gland Top expressed in ventral tegmental area substantia nigra facial motor nucleus enteric nervous system submandibular gland trigeminal ganglion anterior horn of spinal cord medial vestibular nucleus thyroid gland adrenal medulla More reference expression data BioGPS More reference expression data
Gene ontology Molecular function transferase activity nucleotide binding calcium ion binding protein kinase activity kinase activity protein binding protein tyrosine kinase activity ATP binding signaling receptor activity transmembrane receptor protein tyrosine kinase activity receptor tyrosine kinase transmembrane signaling receptor activity Cellular component integral component of membrane endosome intracellular membrane-bounded organelle membrane receptor complex integral component of plasma membrane axon neuronal cell body dendrite early endosome membrane raft endosome membrane plasma membrane cytosol plasma membrane protein complex cytoplasm Biological process cellular response to retinoic acid ureteric bud development embryonic epithelial tube formation membrane protein proteolysis phosphorylation transmembrane receptor protein tyrosine kinase signaling pathway positive regulation of cell migration neuron cell-cell adhesion nervous system development neuron maturation positive regulation of metanephric glomerulus development positive regulation of transcription, DNA-templated regulation of axonogenesis protein phosphorylation enteric nervous system development positive regulation of extrinsic apoptotic signaling pathway in absence of ligand regulation of cell adhesion lymphocyte migration into lymphoid organs cell adhesion positive regulation of gene expression ureter maturation response to pain retina development in camera-type eye neural crest cell migration neuron differentiation positive regulation of cell size positive regulation of neuron projection development posterior midgut development positive regulation of cell adhesion mediated by integrin innervation positive regulation of neuron maturation activation of cysteine-type endopeptidase activity involved in apoptotic process signal transduction homophilic cell adhesion via plasma membrane adhesion molecules Peyer's patch morphogenesis peptidyl-tyrosine phosphorylation MAPK cascade axon guidance positive regulation of peptidyl-serine phosphorylation of STAT protein glial cell-derived neurotrophic factor receptor signaling pathway positive regulation of MAPK cascade positive regulation of protein kinase B signaling negative regulation of signal transduction cell differentiation negative regulation of apoptotic process positive regulation of ERK1 and ERK2 cascade neurogenesis Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 5979 19713 Ensembl ENSG00000165731 ENSMUSG00000030110 UniProt P07949 P35546 RefSeq (mRNA) NM_000323 NM_020629 NM_020630 NM_020975 NM_001355216 NM_001080780 NM_009050 RefSeq (protein) NP_065681 NP_066124 NP_001342145 NP_066124.1 NP_001074249 NP_033076 Location (UCSC) Chr 10: 43.08 – 43.13 Mb Chr 6: 118.13 – 118.17 Mb PubMed search [3] [4]
Wikidata
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The RET proto-oncogene encodes a receptor tyrosine kinase for members of the glial cell line-derived neurotrophic factor (GDNF) family of extracellular signalling molecules.^[5] RET loss of function mutations are associated with the development of Hirschsprung's disease,^[6][7] while gain of function mutations are associated with the development of various types of human cancer, including medullary thyroid carcinoma, multiple endocrine neoplasias type 2A and 2B, pheochromocytoma and parathyroid hyperplasia.^{[citation needed]}

Structure

RET is an abbreviation for "rearranged during transfection", as the DNA sequence of this gene was originally found to be rearranged within a 3T3 fibroblast cell line following its transfection with DNA taken from human lymphoma cells.^[8] The human gene RET is localized to chromosome 10 (10q11.2) and contains 21 exons.^[9]

The natural alternative splicing of the RET gene results in the production of 3 different isoforms of the protein RET. RET51, RET43 and RET9 contain 51, 43 and 9 amino acids in their C-terminal tail respectively.^[10] The biological roles of isoforms RET51 and RET9 are the most well studied in-vivo as these are the most common isoforms in which RET occurs.

Common to each isoform is a domain structure. Each protein is divided into three domains: an N-terminal extracellular domain with four cadherin-like repeats and a cysteine-rich region, a hydrophobic transmembrane domain and a cytoplasmic tyrosine kinase domain, which is split by an insertion of 27 amino acids. Within the cytoplasmic tyrosine kinase domain, there are 16 tyrosines (Tyrs) in RET9 and 18 in RET51. Tyr1090 and Tyr1096 are present only in the RET51 isoform.^[11]

The extracellular domain of RET contains nine N-glycosylation sites. The fully glycosylated RET protein is reported to have a molecular weight of 170 kDa although it is not clear to which isoform this molecular weight relates.^[12]

Kinase activation

RET is the receptor for GDNF-family ligands (GFLs).^[13]

In order to activate RET, GFLs first need to form a complex with a glycosylphosphatidylinositol (GPI)-anchored co-receptor. The co-receptors themselves are classified as members of the GDNF receptor-α (GFRα) protein family. Different members of the GFRα family (GFRα1, GFRα2, GFRα3, GFRα4) exhibit a specific binding activity for a specific GFLs.^[14] Upon GFL-GFRα complex formation, the complex then brings together two molecules of RET, triggering trans-autophosphorylation of specific tyrosine residues within the tyrosine kinase domain of each RET molecule. Tyr900 and Tyr905 within the activation loop (A-loop) of the kinase domain have been shown to be autophosphorylation sites by mass spectrometry.^[15] Phosphorylation of Tyr905 stabilizes the active conformation of the kinase, which, in turn, results in the autophosphorylation of other tyrosine residues mainly located in the C-terminal tail region of the molecule.^[11]

The structure shown to the left was taken from the protein data bank code 2IVT.^[5] The structure is that of a dimer formed between two protein molecules each spanning amino acids 703-1012 of the RET molecule, covering RETs intracellular tyrosine kinase domain. One protein molecule, molecule A is shown in yellow and the other, molecule B in grey. The activation loop is coloured purple and selected tyrosine residues in green. Part of the activation loop from molecule B is absent.

Phosphorylation of Tyr981 and the additional tyrosines Tyr1015, Tyr1062 and Tyr1096, not covered by the above structure, have been shown to be important to the initiation of intracellular signal transduction processes.

Role of RET signalling during development

Mice deficient in GDNF, GFRα1 or the RET protein itself exhibit severe defects in kidney and enteric nervous system development. This implicates RET signal transduction as key to the development of normal kidneys and the enteric nervous system.^[11]

Clinical relevance

At least 26 disease-causing mutations in this gene have been discovered.^[16] Activating point mutations in RET can give rise to the hereditary cancer syndrome known as multiple endocrine neoplasia type 2 (MEN 2).^[17] There are three subtypes based on clinical presentation: MEN 2A, MEN 2B, and familial medullary thyroid carcinoma (FMTC).^[18] There is a high degree of correlation between the position of the point mutation and the phenotype of the disease.

Chromosomal rearrangements that generate a fusion gene, resulting in the juxtaposition of the C-terminal region of the RET protein with an N-terminal portion of another protein, can also lead to constitutive activation of the RET kinase. These types of rearrangements are primarily associated with papillary thyroid carcinoma (PTC) where they represent 10-20% of cases, and non-small cell lung cancer (NSCLC) where they represent 2% of cases. Several fusion partners have been described in the literature, and the most common ones across both cancer types include KIF5B, CCDC6 and NCOA4.

While older multikinase inhibitors such as cabozantinib or vandetanib showed modest efficacy in targeting RET-driven malignancies, newer selective inhibitors (such as selpercatinib and pralsetinib) have shown significant activity in both mutations and fusions. The results of the LIBRETTO-001 trial studying selpercatinib showed a progression-free survival of 17.5 months in previously treated RET-positive NSCLC, and 22 months for RET-positive thyroid cancers, which prompted an FDA approval for both these indications in May 2020. Several other selective RET inhibitors are under development, including TPX-0046, a macrocyclic inhibitor of RET and Src intended to inhibit mutations providing resistance to current inhibitors.

Disease database

The RET gene variant database at the University of Utah, identifies (as of November 2014) 166 mutations that are implicated in MEN2.

Interactions

RET proto-oncogene has been shown to interact with:

• DOK1,^[19]
• DOK5,^[20][21]
• GDNF family receptor alpha 1,^[22][23]
• GRB10,^[24]
• GRB7,^[25]
• Grb2,^[24][26]
• SHC1,^[26][27] and
• STAT3.^[28][29][30]

References

Further reading

External links

• GeneReviews/NCBI/NIH/UW entry on Multiple Endocrine Neoplasia Type 2
• ret+Proto-Oncogene+Proteins at the U.S. National Library of Medicine Medical Subject Headings (MeSH)