Collagen IV is a major constituent of basal membranes.
Alport syndrome
Goodpasture syndrome
References
Hudson BG, Tryggvason K, Sundaramoorthy M, Neilson EG. Alport's syndrome, Goodpasture's syndrome, and type IV collagen. N Engl J Med. 2003 Jun 19;348(25):2543-56. PMID: #12815141#