Reviewed December 2013
What is the official name of the COL4A5 gene?
The official name of this gene is “collagen, type IV, alpha 5.”
COL4A5 is the gene's official symbol. The COL4A5 gene is also known by other names, listed below.
What is the normal function of the COL4A5 gene?
The COL4A5 gene provides instructions for making one component of type IV collagen, which is a flexible protein. Specifically, this gene makes the alpha5(IV) chain of type IV collagen. This chain combines with two other types of alpha (IV) chains (the alpha3 and alpha4 chains) to make a complete type IV collagen molecule. Type IV collagen molecules attach to each other to form complex protein networks. These networks make up a large portion of basement membranes, which are thin sheet-like structures that separate and support cells in many tissues. Type IV collagen alpha3-4-5 networks play an especially important role in the basement membranes of the kidney, inner ear, and eye.
Does the COL4A5 gene share characteristics with other genes?
The COL4A5 gene belongs to a family of genes called COL (collagens).
A gene family is a group of genes that share important characteristics. Classifying individual genes into families helps researchers describe how genes are related to each other. For more information, see What are gene families? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genefamilies) in the Handbook.
How are changes in the COL4A5 gene related to health conditions?
- Alport syndrome - caused by mutations in the COL4A5 gene
More than 400 mutations in the COL4A5 gene have been found to cause Alport syndrome. Most of these mutations change single protein building blocks (amino acids) in a region where the alpha5(IV) collagen chain combines with other type IV collagen chains. Other mutations in the COL4A5 gene severely decrease or prevent the production of alpha5(IV) chains. As a result, there is a serious deficiency of the type IV collagen alpha3-4-5 network in the basement membranes of the kidney, inner ear, and eye. In the kidney, other types of collagen accumulate in the basement membranes, eventually leading to scarring of the kidneys and kidney failure. Mutations in this gene can also lead to abnormal function in the inner ear, resulting in hearing loss.
Where is the COL4A5 gene located?
Cytogenetic Location: Xq22
Molecular Location on the X chromosome: base pairs 108,439,735 to 108,697,544
The COL4A5 gene is located on the long (q) arm of the X chromosome at position 22.
More precisely, the COL4A5 gene is located from base pair 108,439,735 to base pair 108,697,544 on the X chromosome.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
Where can I find additional information about COL4A5?
You and your healthcare professional may find the following resources about COL4A5 helpful.
Educational resources - Information pages
- Molecular Biology of the Cell (fourth edition, 2002): A model of the molecular structure of a basal lamina (http://www.ncbi.nlm.nih.gov/books/NBK26810/?rendertype=figure&id=A3581)
- Molecular Biology of the Cell (fourth edition, 2002): Basal Laminae Perform Diverse Functions (http://www.ncbi.nlm.nih.gov/books/NBK26810/)
- Gene Reviews - Clinical summary (http://www.ncbi.nlm.nih.gov/books/NBK1207)
Genetic Testing Registry - Repository of genetic test information
- GTR: Genetic tests for COL4A5 (http://www.ncbi.nlm.nih.gov/gtr/tests/?term=1287%5Bgeneid%5D)
You may also be interested in these resources, which are designed for genetics professionals and researchers.
- PubMed - Recent literature (http://www.ncbi.nlm.nih.gov/pubmed?term=%28COL4A5%5BTIAB%5D%29%20AND%20%28%28Genes%5BMH%5D%29%20OR%20%28Genetic%20Phenomena%5BMH%5D%29%29%20AND%20english%5Bla%5D%20AND%20human%5Bmh%5D%20AND%20%22last%201800%20days%22%5Bdp%5D)
- OMIM - Genetic disorder catalog (http://omim.org/entry/303630)
Research Resources - Tools for researchers
- Atlas of Genetics and Cytogenetics in Oncology and Haematology (http://atlasgeneticsoncology.org/Genes/GC_COL4A5.html)
- HGNC Gene Family: Collagens (http://www.genenames.org/cgi-bin/genefamilies/set/490)
- HGNC Gene Symbol Report (http://www.genenames.org/cgi-bin/gene_symbol_report?q=data/hgnc_data.php&hgnc_id=2207)
- NCBI Gene (http://www.ncbi.nlm.nih.gov/gene/1287)
What other names do people use for the COL4A5 gene or gene products?
- collagen IV, alpha-5 polypeptide
- collagen of basement membrane, alpha-5 chain
- collagen, type IV, alpha 5 (Alport syndrome)
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
What glossary definitions help with understanding COL4A5?
basal lamina ;
basement membrane ;
basement membranes ;
You may find definitions for these and many other terms in the Genetics Home Reference
- OMIM: COLLAGEN, TYPE IV, ALPHA-5 (http://omim.org/entry/303630)
- Gene Review: Alport Syndrome and Thin Basement Membrane Nephropathy (http://www.ncbi.nlm.nih.gov/books/NBK1207)
- Gross O, Netzer KO, Lambrecht R, Seibold S, Weber M. Meta-analysis of genotype-phenotype correlation in X-linked Alport syndrome: impact on clinical counselling. Nephrol Dial Transplant. 2002 Jul;17(7):1218-27. (http://www.ncbi.nlm.nih.gov/pubmed/12105244?dopt=Abstract)
- Jais JP, Knebelmann B, Giatras I, De Marchi M, Rizzoni G, Renieri A, Weber M, Gross O, Netzer KO, Flinter F, Pirson Y, Dahan K, Wieslander J, Persson U, Tryggvason K, Martin P, Hertz JM, Schröder C, Sanak M, Carvalho MF, Saus J, Antignac C, Smeets H, Gubler MC. X-linked Alport syndrome: natural history and genotype-phenotype correlations in girls and women belonging to 195 families: a "European Community Alport Syndrome Concerted Action" study. J Am Soc Nephrol. 2003 Oct;14(10):2603-10. (http://www.ncbi.nlm.nih.gov/pubmed/14514738?dopt=Abstract)
- Jais JP, Knebelmann B, Giatras I, De Marchi M, Rizzoni G, Renieri A, Weber M, Gross O, Netzer KO, Flinter F, Pirson Y, Verellen C, Wieslander J, Persson U, Tryggvason K, Martin P, Hertz JM, Schröder C, Sanak M, Krejcova S, Carvalho MF, Saus J, Antignac C, Smeets H, Gubler MC. X-linked Alport syndrome: natural history in 195 families and genotype- phenotype correlations in males. J Am Soc Nephrol. 2000 Apr;11(4):649-57. (http://www.ncbi.nlm.nih.gov/pubmed/10752524?dopt=Abstract)
- Kashtan CE. Alport syndrome. An inherited disorder of renal, ocular, and cochlear basement membranes. Medicine (Baltimore). 1999 Sep;78(5):338-60. Review. (http://www.ncbi.nlm.nih.gov/pubmed/10499074?dopt=Abstract)
- Kashtan CE. Familial hematuria due to type IV collagen mutations: Alport syndrome and thin basement membrane nephropathy. Curr Opin Pediatr. 2004 Apr;16(2):177-81. Review. (http://www.ncbi.nlm.nih.gov/pubmed/15021198?dopt=Abstract)
- NCBI Gene (http://www.ncbi.nlm.nih.gov/gene/1287)
- Pescucci C, Longo I, Bruttini M, Mari F, Renieri A. Type-IV collagen related diseases. J Nephrol. 2003 Mar-Apr;16(2):314-6. Review. (http://www.ncbi.nlm.nih.gov/pubmed/12768082?dopt=Abstract)
- Slajpah M, Gorinsek B, Berginc G, Vizjak A, Ferluga D, Hvala A, Meglic A, Jaksa I, Furlan P, Gregoric A, Kaplan-Pavlovcic S, Ravnik-Glavac M, Glavac D. Sixteen novel mutations identified in COL4A3, COL4A4, and COL4A5 genes in Slovenian families with Alport syndrome and benign familial hematuria. Kidney Int. 2007 Jun;71(12):1287-95. Epub 2007 Mar 28. (http://www.ncbi.nlm.nih.gov/pubmed/17396119?dopt=Abstract)
The resources on this site should not be used as a substitute for
professional medical care or advice. Users seeking information about
a personal genetic disease, syndrome, or condition should consult with a qualified
See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.