{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMatrilin‑3 (MATN3) is a cartilage‐specific extracellular matrix protein essential for normal cartilage development and function. Multiple genetic studies have established that mutations in MATN3, particularly those clustering within its conserved A‑domain, are linked to a spectrum of chondrodysplasias such as multiple epiphyseal dysplasia (MED) and hand osteoarthritis. These studies demonstrate that disease‐causing point mutations often lead to misfolding and endoplasmic reticulum retention of MATN3, triggering an unfolded protein response that disrupts chondrocyte function and extracellular matrix homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, the conformation of the MATN3 A‑domain is regulated by zinc ions, allowing it to bind selectively to key extracellular matrix components such as type II and type IX collagens. This binding supports proper fibrillogenesis and matrix assembly; even subtle conformational alterations due to specific mutations can adversely affect collagen network organization without necessarily impairing protein oligomerization. Furthermore, MATN3 is subject to regulatory control—for example, it has been identified as a direct target of microRNAs, thereby linking its expression to processes such as chondrocyte hypertrophy and matrix degradation seen in osteoarthritis progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nClinically, aberrant MATN3 function or expression is associated not only with skeletal dysplasias and early-onset osteoarthritis but also appears to have prognostic relevance in non‐cartilaginous pathologies. Elevated MATN3 levels have been reported in affected cartilage and even in some epithelial neoplasms, suggesting that its dysregulation contributes to pathological extracellular matrix remodeling and tissue degeneration. These findings underscore the chondroprotective role of MATN3—by maintaining cartilage integrity through ensuring proper matrix assembly, it helps to prevent premature chondrocyte hypertrophy and matrix disorganization—and highlight its potential utility as a diagnostic and prognostic biomarker."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Stefán Einar Stefánsson, Helgi Jónsson, Thorvaldur Ingvarsson, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Novel and recurrent mutations clustered in the von Willebrand factor A domain of MATN3 in multiple epiphyseal dysplasia."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Mutat (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/humu.9286"}], "href": "https://doi.org/10.1002/humu.9286"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15459972"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15459972"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Eveliina Jakkula, Outi Mäkitie, Malwina Czarny-Ratajczak, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "COMP mutations, chondrocyte function and cartilage matrix."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Matrix Biol (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.matbio.2004.09.006"}], "href": "https://doi.org/10.1016/j.matbio.2004.09.006"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15694129"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15694129"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "C Otten, R Wagener, M Paulsson, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Matrilin-3 mutations that cause chondrodysplasias interfere with protein trafficking while a mutation associated with hand osteoarthritis does not."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Med Genet (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1136/jmg.2004.029462"}], "href": "https://doi.org/10.1136/jmg.2004.029462"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16199550"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16199550"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Sally L Cotterill, Gail C Jackson, Matthew P Leighton, et al. 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