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'''CIITA''' (Class II Major Histocompatibility Complex Transactivator) is a [[protein]] that in humans is encoded by the ''CIITA'' [[gene]]. CIITA is a key regulator in the immune system, specifically in the expression of the Class II [[Major Histocompatibility Complex]] (MHC).

== Function ==

CIITA is a [[transcription factor]] that regulates the expression of Class II MHC genes. The Class II MHC proteins are essential for the immune system's ability to present [[antigen]]s to the [[T cell]]s, a process known as antigen presentation. Without CIITA, the Class II MHC genes are not expressed, which can lead to a weakened immune response.

== Structure ==

The CIITA protein is composed of several domains, each with a specific function. The N-terminal domain is involved in [[transcriptional activation]], while the C-terminal domain is responsible for the protein's nuclear localization. The central region of the protein contains a proline-rich domain and a leucine-rich repeat (LRR) domain, which are thought to be involved in protein-protein interactions.

== Clinical significance ==

Mutations in the ''CIITA'' gene can lead to a rare immunodeficiency disorder known as Bare Lymphocyte Syndrome type II (BLS II). This condition is characterized by a lack of MHC Class II expression, leading to severe combined immunodeficiency.

== See also ==

* [[Major Histocompatibility Complex]]
* [[Transcription factor]]
* [[Antigen presentation]]
* [[Bare Lymphocyte Syndrome]]

== References ==

<references />

[[Category:Genes]]
[[Category:Proteins]]
[[Category:Immunology]]
[[Category:Transcription factors]]

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CIITA - Revision history

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