Editing CYP7B1


{{Infobox gene
| name = CYP7B1
| image = <!-- Image removed -->
| caption = <!-- Image caption -->
| HGNCid = 2653
| symbol = CYP7B1
| alt_symbols = CBAS3, SPG5A
| EntrezGene = 9420
| OMIM = 603711
| RefSeq = NM_004820
| UniProt = O75881
| chromosome = 8
| arm = q
| band = 21.3
}}

'''CYP7B1''' is a gene that encodes the enzyme cytochrome P450 7B1, which is involved in the metabolism of [[cholesterol]] and [[neurosteroids]]. This enzyme is part of the cytochrome P450 superfamily of enzymes, which are monooxygenases that catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids, and other lipids.

== Function ==
CYP7B1 is primarily expressed in the [[liver]], [[brain]], and other tissues, where it plays a crucial role in the [[biosynthesis]] of bile acids from cholesterol. It specifically catalyzes the hydroxylation of 25-hydroxycholesterol and other oxysterols, which are important intermediates in the synthesis of bile acids. This process is essential for maintaining cholesterol homeostasis and for the elimination of excess cholesterol from the body.

== Clinical Significance ==
Mutations in the CYP7B1 gene have been associated with a rare genetic disorder known as [[Spastic paraplegia 5A]] (SPG5A), which is a form of [[hereditary spastic paraplegia]]. This condition is characterized by progressive weakness and spasticity of the lower limbs. The mutations lead to a deficiency in the enzyme's activity, resulting in the accumulation of neurotoxic oxysterols, which may contribute to the neurological symptoms observed in affected individuals.

== Pathways ==
CYP7B1 is involved in several metabolic pathways, including the [[bile acid biosynthesis]] pathway and the [[steroid hormone biosynthesis]] pathway. It also plays a role in the metabolism of [[androgens]] and [[estrogens]], influencing the levels of these hormones in the body.

== Research ==
Research on CYP7B1 continues to explore its role in cholesterol metabolism and its potential implications in various diseases, including [[neurodegenerative disorders]] and [[cardiovascular diseases]]. Understanding the function and regulation of CYP7B1 may provide insights into new therapeutic targets for these conditions.

== See Also ==
* [[Cytochrome P450]]
* [[Cholesterol metabolism]]
* [[Hereditary spastic paraplegia]]

== References ==
<references/>

== External Links ==
* [CYP7B1 gene - Genetics Home Reference](https://ghr.nlm.nih.gov/gene/CYP7B1)
* [CYP7B1 - GeneCards](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CYP7B1)

[[Category:Genes on human chromosome 8]]
[[Category:Cytochrome P450]]
[[Category:Enzymes]]
[[Category:Hereditary spastic paraplegia]]