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Reviewed February 2012
What is the official name of the BTK gene?
The official name of this gene is “Bruton tyrosine kinase.”
BTK is the gene's official symbol. The BTK 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 BTK gene?
The BTK gene provides instructions for making a protein called Bruton tyrosine kinase (BTK), which is essential for the development and maturation of B cells. B cells are specialized white blood cells that help protect the body against infection. These cells can mature into cells that produce special proteins called antibodies or immunoglobulins. Antibodies attach to specific foreign particles and germs, marking them for destruction. The BTK protein transmits important chemical signals that instruct B cells to mature and produce antibodies.
Does the BTK gene share characteristics with other genes?
The BTK gene belongs to a family of genes called SH2 domain containing (SH2 domain containing).
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 BTK gene related to health conditions?
Where is the BTK gene located?
Cytogenetic Location: Xq21.33-q22
Molecular Location on the X chromosome: base pairs 101,349,447 to 101,390,796
(Homo sapiens Annotation Release 107, GRCh38.p2) (
The BTK gene is located on the long (q) arm of the X chromosome between positions 21.33 and 22.
More precisely, the BTK gene is located from base pair 101,349,447 to base pair 101,390,796 on the X chromosome.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about BTK?
You and your healthcare professional may find the following resources about BTK 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 BTK 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 BTK?
amino acid ; ataxia ; cell ; deficiency ; dementia ; DNA ; dystonia ; gene ; growth hormone ; hormone ; immune system ; infection ; involuntary ; kinase ; protein ; short stature ; stature ; susceptibility ; syndrome ; tyrosine ; white blood cells
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (11 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.