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Reviewed January 2013
What is the official name of the COL9A1 gene?
The official name of this gene is “collagen, type IX, alpha 1.”
COL9A1 is the gene's official symbol. The COL9A1 gene is also known by other names, listed below.
Read more about gene names and symbols on the About page.
What is the normal function of the COL9A1 gene?
The COL9A1 gene provides instructions for making part of a large molecule called type IX collagen. Collagens are a family of proteins that strengthen and support connective tissues, such as skin, bone, cartilage, tendons, and ligaments. In particular, type IX collagen is an important component of cartilage, which is a tough, flexible tissue that makes up much of the skeleton during early development. Most cartilage is later converted to bone, except for the cartilage that continues to cover and protect the ends of bones and is present in the nose and external ears.
Type IX collagen is made up of three proteins that are produced from three distinct genes: one α1(IX) chain, which is produced from the COL9A1 gene, one α2(IX) chain, which is produced from the COL9A2 gene, and one α3(IX) chain, which is produced from the COL9A3 gene. Type IX collagen is more flexible than other types of collagen molecules and is closely associated with type II collagen. Researchers believe that the flexible nature of type IX collagen allows it to act as a bridge that connects type II collagen with other cartilage components. Studies have shown that type IX collagen also interacts with the proteins produced from the MATN3 and COMP genes.
Does the COL9A1 gene share characteristics with other genes?
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? in the Handbook.
How are changes in the COL9A1 gene related to health conditions?
Where is the COL9A1 gene located?
Cytogenetic Location: 6q13
Molecular Location on chromosome 6: base pairs 70,216,039 to 70,303,082
The COL9A1 gene is located on the long (q) arm of chromosome 6 at position 13.
More precisely, the COL9A1 gene is located from base pair 70,216,039 to base pair 70,303,082 on chromosome 6.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about COL9A1?
You and your healthcare professional may find the following resources about COL9A1 helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
What other names do people use for the COL9A1 gene or gene products?
See How are genetic conditions and genes named? in the Handbook.
Where can I find general information about genes?
The Handbook provides basic information about genetics in clear language.
These links provide additional genetics resources that may be useful.
What glossary definitions help with understanding COL9A1?
acids ; autosomal ; autosomal recessive ; cartilage ; cell ; collagen ; deletion ; DNA ; dysplasia ; exon ; gene ; inheritance ; joint ; molecule ; mutation ; nucleotide ; protein ; recessive ; splice-site mutation ; syndrome ; tissue
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (8 links)
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 healthcare professional. See How can I find a genetics professional in my area? in the Handbook.