Mutations in MMP9 and MMP13 Determine the Mode of Inheritance and the Clinical Spectrum of Metaphyseal Anadysplasia |
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Authors: | Ekkehart Lausch Romy Keppler Valerie Cormier-Daire Gen Nishimura Jürgen Spranger Bernhard Zabel |
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Institution: | 1 Centre for Pediatrics and Adolescent Medicine, Freiburg University Hospital, 79106 Freiburg, Germany 2 Department of Genetics and INSERM U781, Hôpital Necker Enfants Malades, 75015 Paris, France 3 Department of Genetics, Children's Hospital of Eastern Ontario, Ottawa ON K1H8L1, Canada 4 Department of Radiology, Tokyo Metropolitan Kiyose Children's Hospital, 1-3-1 Umezono, Kiyose, Tokyo 204, Japan 5 Institute of Human Genetics, Freiburg University Hospital, 79106 Freiburg, Germany |
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Abstract: | The matrix metalloproteinases MMP9 and MMP13 catalyze the degradation of extracellular matrix (ECM) components in the growth plate and at the same time cleave and release biologically active molecules stored in the ECM, such as VEGFA. In mice, ablation of Mmp9, Mmp13, or both Mmp9 and Mmp13 causes severe distortion of the metaphyseal growth plate. We report that mutations in either MMP9 or MMP13 are responsible for the human disease metaphyseal anadysplasia (MAD), a heterogeneous group of disorders for which a milder recessive variant and a more severe dominant variant are known. We found that recessive MAD is caused by homozygous loss of function of either MMP9 or MMP13, whereas dominant MAD is associated with missense mutations in the prodomain of MMP13 that determine autoactivation of MMP13 and intracellular degradation of both MMP13 and MMP9, resulting in a double enzymatic deficiency. |
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