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Collagen, type IX, alpha 2
Symbols COL9A2 ; MED; DJ39G22.4; EDM2
External IDs Template:OMIM5 Template:MGI HomoloGene37535
RNA expression pattern
PBB GE COL9A2 213622 at tn.png
More reference expression data
Template:GNF Ortholog box
Species Human Mouse
Entrez n/a n/a
Ensembl n/a n/a
UniProt n/a n/a
RefSeq (mRNA) n/a n/a
RefSeq (protein) n/a n/a
Location (UCSC) n/a n/a
PubMed search n/a n/a

Collagen, type IX, alpha 2, also known as COL9A2, is a human gene.[1]

This gene encodes one of the three alpha chains of type IX collagen, the major collagen component of hyaline cartilage. Type IX collagen, a heterotrimeric molecule, is usually found in tissues containing type II collagen, a fibrillar collagen. This chain is unusual in that, unlike the other two type IX alpha chains, it contains a covalently attached glycosaminoglycan side chain. Mutations in this gene are associated with multiple epiphyseal dysplasia.[1]


  1. 1.0 1.1 "Entrez Gene: COL9A2 collagen, type IX, alpha 2".

Further reading

  • Fahrig T, Landa C, Pesheva P; et al. (1988). "Characterization of binding properties of the myelin-associated glycoprotein to extracellular matrix constituents". EMBO J. 6 (10): 2875–83. PMID 2446864.
  • McCormick D, van der Rest M, Goodship J; et al. (1987). "Structure of the glycosaminoglycan domain in the type IX collagen-proteoglycan". Proc. Natl. Acad. Sci. U.S.A. 84 (12): 4044–8. PMID 3473493.
  • Warman ML, McCarthy MT, Perälä M; et al. (1995). "The genes encoding alpha 2(IX) collagen (COL9A2) map to human chromosome 1p32.3-p33 and mouse chromosome 4". Genomics. 23 (1): 158–62. doi:10.1006/geno.1994.1472. PMID 7829066.
  • Briggs MD, Choi H, Warman ML; et al. (1994). "Genetic mapping of a locus for multiple epiphyseal dysplasia (EDM2) to a region of chromosome 1 containing a type IX collagen gene". Am. J. Hum. Genet. 55 (4): 678–84. PMID 7942845.
  • Warman ML, Tiller GE, Polumbo PA; et al. (1993). "Physical and linkage mapping of the human and murine genes for the alpha 1 chain of type IX collagen (COL9A1)". Genomics. 17 (3): 694–8. PMID 8244386.
  • Perälä M, Hänninen M, Hästbacka J; et al. (1993). "Molecular cloning of the human alpha 2(IX) collagen cDNA and assignment of the human COL9A2 gene to chromosome 1". FEBS Lett. 319 (1–2): 177–80. PMID 8454052.
  • Muragaki Y, Mariman EC, van Beersum SE; et al. (1996). "A mutation in the gene encoding the alpha 2 chain of the fibril-associated collagen IX, COL9A2, causes multiple epiphyseal dysplasia (EDM2)". Nat. Genet. 12 (1): 103–5. doi:10.1038/ng0196-103. PMID 8528240.
  • Pihlajamaa T, Vuoristo MM, Annunen S; et al. (1998). "Human COL9A1 and COL9A2 genes. Two genes of 90 and 15 kb code for similar polypeptides of the same collagen molecule". Matrix Biol. 17 (3): 237–41. PMID 9707347.
  • Holden P, Canty EG, Mortier GR; et al. (1999). "Identification of novel pro-alpha2(IX) collagen gene mutations in two families with distinctive oligo-epiphyseal forms of multiple epiphyseal dysplasia". Am. J. Hum. Genet. 65 (1): 31–8. PMID 10364514.
  • Annunen S, Paassilta P, Lohiniva J; et al. (1999). "An allele of COL9A2 associated with intervertebral disc disease". Science. 285 (5426): 409–12. PMID 10411504.
  • Czarny-Ratajczak M, Lohiniva J, Rogala P; et al. (2001). "A mutation in COL9A1 causes multiple epiphyseal dysplasia: further evidence for locus heterogeneity". Am. J. Hum. Genet. 69 (5): 969–80. PMID 11565064.
  • Fertala A, Sieron AL, Adachi E, Jimenez SA (2002). "Collagen II containing a Cys substitution for Arg-alpha1-519: abnormal interactions of the mutated molecules with collagen IX". Biochemistry. 40 (48): 14422–8. PMID 11724554.
  • Fiedler J, Stöve J, Heber F, Brenner RE (2003). "Clinical phenotype and molecular diagnosis of multiple epiphyseal dysplasia with relative hip sparing during childhood (EDM2)". Am. J. Med. Genet. 112 (2): 144–53. doi:10.1002/ajmg.10554. PMID 12244547.
  • Matsui Y, Wu JJ, Weis MA; et al. (2004). "Matrix deposition of tryptophan-containing allelic variants of type IX collagen in developing human cartilage". Matrix Biol. 22 (2): 123–9. PMID 12782139.
  • Kim MS, Hwang NS, Lee J; et al. (2005). "Musculoskeletal differentiation of cells derived from human embryonic germ cells". Stem Cells. 23 (1): 113–23. doi:10.1634/stemcells.2004-0110. PMID 15625128.
  • Jim JJ, Noponen-Hietala N, Cheung KM; et al. (2006). "The TRP2 allele of COL9A2 is an age-dependent risk factor for the development and severity of intervertebral disc degeneration". Spine. 30 (24): 2735–42. PMID 16371896.
  • Takahashi M, Matsui Y, Goto T; et al. (2006). "Intrafamilial phenotypic diversity in multiple epiphyseal dysplasia associated with a COL9A2 mutation (EDM2)". Clin. Rheumatol. 25 (4): 591–5. doi:10.1007/s10067-005-0034-z. PMID 16440132.
  • Gregory SG, Barlow KF, McLay KE; et al. (2006). "The DNA sequence and biological annotation of human chromosome 1". Nature. 441 (7091): 315–21. doi:10.1038/nature04727. PMID 16710414.
  • Seki S, Kawaguchi Y, Mori M; et al. (2007). "Association study of COL9A2 with lumbar disc disease in the Japanese population". J. Hum. Genet. 51 (12): 1063–7. doi:10.1007/s10038-006-0062-9. PMID 17024315.

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