{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSPRED2 is emerging as an important modulator in human diseases through its genetic and clinical associations. Genome‐wide studies have identified SPRED2 as being located near risk alleles for rheumatoid arthritis"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ", and loss‐of‐function variants in SPRED2 have been linked to a distinct recessive Noonan syndrome‐like phenotype, characterized by developmental delay, short stature, and cardiac defects."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Furthermore, proteomic profiling in Down syndrome placentas suggests an altered SPRED2 expression that may contribute to disease progression"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ", while clinical overlaps with other RASopathies underscore its relevance in syndromic disorders."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMechanistically, SPRED2 functions as a negative regulator of the Ras/ERK signaling cascade in multiple contexts. In hepatocellular carcinoma (HCC), decreased SPRED2 levels are associated with enhanced ERK activation, increased matrix metalloproteinase secretion, and tumor invasion, with microRNAs such as miR‐487a and miR‐19 directly targeting SPRED2 to promote proliferation, metastasis, and reduced autophagy."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "8"}]}, {"type": "t", "text": " In HCC cells, SPRED2 downregulation also enhances epithelial‐mesenchymal transition (EMT) and stemness"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", while its overexpression can counteract EMT and invasion in colorectal cancer"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "and transformed keratinocytes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " SPRED2 also promotes autophagy in tumor cells, contributing to caspase‐independent cell death"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": ", and operates via mechanisms distinct from other family members such as SPRED1."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": " Moreover, its function is intricately linked to receptor trafficking through interaction with NBR1"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": ", and SPRED2 stability is regulated by Cbl‐mediated ubiquitination."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": " Its association with the p85 subunit of PI3K further enhances its inhibitory effect on Ras/ERK signaling, thereby reducing cell proliferation and neurite outgrowth."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": " SPRED2 also modulates responses to reactive lipid mediators"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": ", contributes to lineage differentiation in chronic myelogenous leukemia"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "19"}]}, {"type": "t", "text": ", and engages in a specific interaction with RSK2 that is critical for fine‐tuning MAPK pathway dynamics."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn developmental and tissue‐specific contexts, SPRED2 plays multifaceted roles. 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