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Plays an essential role in the regulation of cell survival and proliferation, hematopoiesis, stem cell maintenance, gametogenesis, mast cell development, migration and function, and in melanogenesis. KITLG/SCF binding can activate several signaling pathways. Promotes phosphorylation of PIK3R1, the regulatory subunit of phosphatidylinositol 3-kinase, and subsequent activation of the kinase AKT1. KITLG/SCF and KIT also transmit signals via GRB2 and activation of RAS, RAF1 and the MAP kinases MAPK1/ERK2 and/or MAPK3/ERK1. KITLG/SCF and KIT promote activation of STAT family members STAT1, STAT3 and STAT5. KITLG/SCF and KIT promote activation of PLCG1, leading to the production of the cellular signaling molecules diacylglycerol and inositol 1,4,5-trisphosphate. KITLG/SCF acts synergistically with other cytokines, probably interleukins"}],"commentType":"FUNCTION"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"17662946"},{"evidenceCode":"ECO:0000305"}],"value":"Homodimer, non-covalently linked (Probable). Heterotetramer with KIT, binding two KIT molecules; thereby mediates KIT dimerization and subsequent activation by autophosphorylation"}],"commentType":"SUBUNIT"},{"commentType":"INTERACTION","interactions":[{"interactantOne":{"uniProtKBAccession":"P21583","intActId":"EBI-1379527"},"interactantTwo":{"uniProtKBAccession":"P10721","geneName":"KIT","intActId":"EBI-1379503"},"numberOfExperiments":2,"organismDiffer":false}]},{"commentType":"SUBCELLULAR LOCATION","molecule":"Isoform 1","subcellularLocations":[{"location":{"value":"Cell membrane","id":"SL-0039"},"topology":{"value":"Single-pass type I membrane protein","id":"SL-9905"}}]},{"commentType":"SUBCELLULAR LOCATION","molecule":"Isoform 2","subcellularLocations":[{"location":{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"26522471"}],"value":"Cytoplasm","id":"SL-0086"}},{"location":{"evidences":[{"evidenceCode":"ECO:0000250"}],"value":"Cytoplasm, cytoskeleton","id":"SL-0090"}},{"location":{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"26522471"}],"value":"Cell membrane","id":"SL-0039"},"topology":{"evidences":[{"evidenceCode":"ECO:0000250"}],"value":"Single-pass type I membrane protein","id":"SL-9905"}},{"location":{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"26522471"}],"value":"Cell projection, lamellipodium","id":"SL-0291"}},{"location":{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"26522471"}],"value":"Cell projection, filopodium","id":"SL-0286"}}]},{"commentType":"SUBCELLULAR LOCATION","molecule":"Soluble KIT ligand","subcellularLocations":[{"location":{"value":"Secreted","id":"SL-0243"}}]},{"commentType":"ALTERNATIVE PRODUCTS","events":["Alternative splicing"],"isoforms":[{"name":{"value":"1"},"synonyms":[{"value":"SCF248"}],"isoformIds":["P21583-1"],"isoformSequenceStatus":"Displayed"},{"name":{"value":"2"},"synonyms":[{"value":"SCF220"}],"isoformIds":["P21583-2"],"sequenceIds":["VSP_006022"],"isoformSequenceStatus":"Described"},{"name":{"value":"3"},"isoformIds":["P21583-3"],"sequenceIds":["VSP_032762","VSP_032763"],"isoformSequenceStatus":"Described"}]},{"texts":[{"value":"Acts in the early stages of hematopoiesis"}],"commentType":"DEVELOPMENTAL STAGE"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"1381905"}],"value":"A soluble form (sKITLG) is produced by proteolytic processing of isoform 1 in the extracellular domain"}],"commentType":"PTM"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"1381905"}],"value":"Found in two differentially glycosylated forms, LMW-SCF and HMW-SCF. LMW-SCF is fully N-glycosylated at Asn-145, partially N-glycosylated at Asn-90, O-glycosylated at Ser-167, Thr-168 and Thr-180, and not glycosylated at Asn-97 or Asn-118. HMW-SCF is N-glycosylated at Asn-118, Asn-90 and Asn-145, O-glycosylated at Ser-167, Thr-168 and Thr-180, and not glycosylated at Asn-97"}],"commentType":"PTM"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"1381905"}],"value":"A soluble form exists as a cleavage product of the extracellular domain"}],"commentType":"PTM"},{"texts":[{"value":"Genetic variants in KITLG define the skin/hair/eye pigmentation variation locus 7 (SHEP7) [MIM:611664]. Hair, eye and skin pigmentation are among the most visible examples of human phenotypic variation, with a broad normal range that is subject to substantial geographic stratification. In the case of skin, individuals tend to have lighter pigmentation with increasing distance from the equator. By contrast, the majority of variation in human eye and hair color is found among individuals of European ancestry, with most other human populations fixed for brown eyes and black hair"}],"commentType":"POLYMORPHISM"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"24880339"}],"value":"A non-coding SNP (dbSNP:rs12821256) has been shown to be associated with classic blond hair color in Europeans. This SNP is located 350 kb upstream from KITLG, in an enhancer specifically active in the hair follicle environment. It alters a LEF1 binding site, reducing LEF1 responsiveness in cultured keratinocytes. This SNP is not associated with eye pigmentation. It is most prevalent in Northern Europe (PubMed:24880339)"}],"commentType":"POLYMORPHISM"},{"commentType":"DISEASE","disease":{"diseaseId":"Hyperpigmentation with or without hypopigmentation, familial progressive","diseaseAccession":"DI-02576","acronym":"FPHH","description":"A disorder characterized by hyperpigmented patches in the skin, present in early infancy and increasing in size and number with age. 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