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FUNCTION Receptor tyrosine-protein kinase involved in numerous cellular mechanisms including cell proliferation, neuronal navigation, cell migration, and cell differentiation in response to glia cell line-derived growth family factors (GDNF, NRTN, ARTN, PSPN and GDF15) (PubMed:20064382, PubMed:20616503, PubMed:20702524, PubMed:21357690, PubMed:21454698, PubMed:24560924, PubMed:28846097, PubMed:28846099, PubMed:28953886, PubMed:31118272). In contrast to most receptor tyrosine kinases, RET requires not only its cognate ligands but also coreceptors, for activation (PubMed:21994944, PubMed:23333276, PubMed:28846097, PubMed:28846099, PubMed:28953886). GDNF ligands (GDNF, NRTN, ARTN, PSPN and GDF15) first bind their corresponding GDNFR coreceptors (GFRA1, GFRA2, GFRA3, GFRA4 and GFRAL, respectively), triggering RET autophosphorylation and activation, leading to activation of downstream signaling pathways, including the MAPK- and AKT-signaling pathways (PubMed:21994944, PubMed:23333276, PubMed:24560924, PubMed:25242331, PubMed:28846097, PubMed:28846099, PubMed:28953886). Acts as a dependence receptor via the GDNF-GFRA1 signaling: in the presence of the ligand GDNF in somatotrophs within pituitary, promotes survival and down regulates growth hormone (GH) production, but triggers apoptosis in absence of GDNF (PubMed:20616503, PubMed:21994944). Required for the molecular mechanisms orchestration during intestine organogenesis via the ARTN-GFRA3 signaling: involved in the development of enteric nervous system and renal organogenesis during embryonic life, and promotes the formation of Peyer's patch-like structures, a major component of the gut-associated lymphoid tissue (By similarity). Mediates, through interaction with GDF15-receptor GFRAL, GDF15-induced cell-signaling in the brainstem which triggers an aversive response, characterized by nausea, vomiting, and/or loss of appetite in response to various stresses (PubMed:28846097, PubMed:28846099, PubMed:28953886). Modulates cell adhesion via its cleavage by caspase in sympathetic neurons and mediates cell migration in an integrin (e.g. ITGB1 and ITGB3)-dependent manner (PubMed:20702524, PubMed:21357690). Also active in the absence of ligand, triggering apoptosis through a mechanism that requires receptor intracellular caspase cleavage (PubMed:21357690). Triggers the differentiation of rapidly adapting (RA) mechanoreceptors (PubMed:20064382). Involved in the development of the neural crest (By similarity). Regulates nociceptor survival and size (By similarity). Phosphorylates PTK2/FAK1 (PubMed:21454698).FUNCTION Isoform 1 in complex with GFRAL induces higher activation of MAPK-signaling pathway than isoform 2 in complex with GFRAL.CATALYTIC ACTIVITY L-tyrosyl-[protein] + ATP = O-phospho-L-tyrosyl-[protein] + ADP + H(+)COFACTOR Repressed by 4-(3-hydroxyanilino)-quinolines derivatives, indolin-2-one-derivatives, 2-(alkylsulfanyl)-4-(3-thienyl) nicotinonitrile analogs, 3- and 4-substituted beta-carbolin-1-ones, vandetanib, motesanib, sorafenib (BAY 43-9006), cabozantinib (XL184), lenvatinib, sunitinib, nintedanib, and withaferin A (WA) (PubMed:17664273, PubMed:17884497, PubMed:19053769, PubMed:20117004, PubMed:20409618, PubMed:20605972, PubMed:21134556, PubMed:29908090, PubMed:31118272). Inactivation by sorafenib both reduces kinase activity and promotes lysosomal degradation (PubMed:17664273).SUBUNIT Phosphorylated form interacts with the PBT domain of DOK2, DOK4 and DOK5 (By similarity). The phosphorylated form interacts with PLCG1 and GRB7 (By similarity). Interacts (not phosphorylated) with PTK2/FAK1 (via FERM domain) (PubMed:21454698). Extracellular cell-membrane anchored RET cadherin fragments form complex in neurons with reduced trophic status, preferentially at the contact sites between somas (PubMed:21357690). Interacts with AIP in the pituitary gland; this interaction prevents the formation of the AIP-survivin complex (PubMed:19366855). Interacts (inactive) with CBLC and CD2AP; dissociates upon activation by GDNF which increases CBLC:CD2AP interaction (PubMed:18753381).INTERACTION Predominantly located on the plasma membrane (PubMed:23333276, PubMed:9575150). In the presence of SORL1 and GFRA1, directed to endosomes (PubMed:23333276).ALTERNATIVE PRODUCTS Positively regulated by NKX2-1, PHOX2B, SOX10 and PAX3.PTM Autophosphorylated on C-terminal tyrosine residues upon ligand stimulation.PTM Proteolytically cleaved by caspase-3. The soluble RET kinase fragment is able to induce cell death. The extracellular cell-membrane anchored RET cadherin fragment accelerates cell adhesion in sympathetic neurons.DISEASE The disease is caused by variants affecting the gene represented in this entry.DISEASE The disease is caused by variants affecting the gene represented in this entry.DISEASE The disease is caused by variants affecting the gene represented in this entry.DISEASE Disease susceptibility is associated with variants affecting the gene represented in this entry.DISEASE The disease is caused by variants affecting the gene represented in this entry.DISEASE Various chromosomal aberrations involving RET are known. Some of them have been found in papillary thyroid carcinomas (PTCs) (PubMed:10439047, PubMed:10980597, PubMed:12787916, PubMed:2406025). Inversion inv(10)(q11.2;q21) generates the RET/CCDC6 (PTC1) oncogene (PubMed:2406025). Inversion inv(10)(q11.2;q11.2) generates the RET/NCOA4 (PTC3) oncogene. Translocation t(10;14)(q11;q32) with GOLGA5 generates the RET/GOLGA5 (PTC5) oncogene (PubMed:2734021). Translocation t(8;10)(p21.3;q11.2) with PCM1 generates the PCM1/RET fusion (PubMed:10980597). Translocation t(6;10)(p21.3;q11.2) with TRIM27/RFP generates the Delta RFP/RET oncogene (PubMed:12787916). Translocation t(1;10)(p13;q11) with TRIM33 generates the TRIM33/RET (PTC7) oncogene (PubMed:10439047). Translocation t(7;10)(q32;q11) with TRIM24/TIF1 generates the TRIM24/RET (PTC6) oncogene (PubMed:10439047). Translocation t(6;10)(p21.3;q11.2) with TRIM27/RFP generates the TRIM27/RET oncogene (PubMed:3037315).DISEASE Mutations in RET have been detected in patients with renal agenesis suggesting a possible involvement of this gene in disease pathogenesis.MISCELLANEOUS Treatment with withaferin A (WA) leads tumor regression in medullary thyroid carcinomas (MTC).SIMILARITY Belongs to the protein kinase superfamily. Tyr protein kinase family.CAUTION Original thought to be dephosphorylated by PTPRJ on Tyr-905, Tyr-1015 and Tyr-1062. However this paper was retracted due to manipulation of immunoblot data.SEQUENCE CAUTION Extended N-terminus.SEQUENCE CAUTION Extended N-terminus.SEQUENCE CAUTION Extended N-terminus.SEQUENCE CAUTION Extended N-terminus.
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