Function
Type IV collagen is the major structural component of glomerular basement membranes (GBM), forming a 'chicken-wire' meshwork together with laminins, proteoglycans and entactin/nidogen.
Gene References into Functions
- COL4A mutations comprise a frequent cause of Familial microscopic hematuria. PMID: 28632965
- Three collagen type IV alpha 4 chain (COL4A4) heterozygous mutations that lead to 3 different collagen type IV kidney disease phenotypes, manifesting as Thin basement membrane nephropathy (TBMN), autosomal dominant Alport syndrome (ADAS), and focal segmental glomerulosclerosis (FSGS). PMID: 29669314
- This finding broadens mutation spectrum of the COL4A4 gene and extends the phenotypic spectrum of collagen IV nephropathies. PMID: 27469977
- A novel frameshift mutation, c.3213delA (p.Gly1072GlufsFNx0169) in the COL4A4 gene, was identified in the Chinese pedigree with autosomal dominant Alport syndrome PMID: 27934798
- we describe a novel splicing mutation in COL4A4 that results in TBMN. This analysis increases our understanding of TBMN phenotype-genotype correlations, which should facilitate more accurate diagnosis and prenatal diagnosis of TBMN. PMID: 26833262
- New COL4A4 mutations among Portuguese patients with collagen IV-related nephropathies were identified in 8 unrelated families. PMID: 25307543
- Tetrastatin, the NC1 alpha 4 collagen IV domain level increases in pulmonary tumor extracts. PMID: 25935259
- COL4A4 rs2229813 AA and GA+AA genotypes as well as the A allele play roles as risk factors for developing Keratoconus in our population. PMID: 25651396
- COL4A4 missense variants [c.G2636A (p.Gly879Glu) and c.C4715T (p.Pro1572Leu)] in family 1. COL4A4 c.G2636A, a novel variant, co-segregated with renal disease among maternal relatives. PMID: 25381091
- 9 mutation in COL4A4 associated with autosomal dominant Alport syndrome. PMID: 24033287
- COL4A4 related nephropathy caused by novel mutation in a large consanguineous Saudi family. PMID: 24398087
- Our findings suggest that variants in the COL4A4 gene may contribute to the development of lattice degeneration of the retina. PMID: 22723992
- The absence of pathogenic mutations in COL4A4 gene in our large number of unrelated keratoconus patients indicates that other genetic factors are involved in the development of this disorder PMID: 20664914
- COL4A4 mutation: from familial hematuria to autosomal-dominant or recessive Alport syndrome. PMID: 12028435
- Six of seven (86%) individuals with autosomal recessive Alport syndrome who had 3 novel COL4A4 mutations in the compound heterozygous or homozygous forms developed renal failure in adulthood, as well as hearing loss and ocular abnormalities. PMID: 12325029
- Two stop codons (R1377X and 2788/91delG) and a glycine substitution (G960R) resulted in hematuria. S969X mutation. PMID: 12631110
- COL4A4 gene is associted with Alport's syndrome in which males and females are severely affected. PMID: 12768082
- Mutations in COL4A3 and COL4A4 genes produce alteration to glomerular basement membrane(GBM). Phenotype may range from thinned GBM ro GBM thickening, lamellation and splitting. Review. PMID: 15280517
- Persistent familial hematuria in children often occurs at the COLA4A locus for thin membrane nephropathy. PMID: 16235097
- The molecular analysis demonstrated that the probands were genetic compounds for two different mutations in the COL4A4 gene pinpointing to the correct diagnosis of autosomal recessive ATS. PMID: 16338941
- A clinical evaluation of probands and their relatives of the five families carrying mutations in either the COL4A3 or the COL4A4 gene was carried out to underline the natural history of the autosomal recessive ATS. PMID: 16970251
- 16 novel mutations identified in COL4A3, COL4A4 & COL4A5 genes in Slovenian families with Alport syndrome & benign familial hematuria (BFH); 4 heterozygous mutations in COL4A4 (2 splice site, 1 in-frame deletion & 1 missense) identified in BFH PMID: 17396119
- On the basis of linked-function analysis, we demonstrated that collagen binding domain of MMP2 tuned the cleavage of collagen IV by MMP9, presumably by inducing a ligand-linked structural change on the type IV collagen. PMID: 19109975
- It is difficult to make a differential diagnosis with a benign familial haematuria due to heterozygous mutations of COL4A4 and COL4A3, especially in young patients, and with a X-linked form of Alport syndrome in families where only females are affected. PMID: 19129241
- Novel variants in the COL4A4 gene in Korean patients with thin basement membrane nephropathy. PMID: 19675380
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Involvement in disease
Alport syndrome, autosomal recessive (APSAR); Hematuria, benign familial (BFH)
Subcellular Location
Secreted, extracellular space, extracellular matrix, basement membrane.
Protein Families
Type IV collagen family
Tissue Specificity
Expressed in Bruch's membrane, outer plexiform layer, inner nuclear layer, inner plexiform layer, ganglion cell layer, inner limiting membrane and around the blood vessels of the retina (at protein level). Alpha 3 and alpha 4 type IV collagens are colocal
