MMP9(redirected from 92 kDa type IV collagenase)
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MMP9A gene on chromosome 20q12-q13 that encodes matrix metalloproteinase 9, which degrades collagens IV and V, gelatins I and V, and fibronectin. It is thought to play a key role in local proteolysis of the extracellular matrix and in leukocyte migration, and may play a role in osteoclastic resorption of bone.
Defects in MMP9 increase susceptibility to intervertebral disc disease and lumbar disc herniation; MMP9 defects cause metaphyseal anadysplasia type 2.