CYP21A2

Gene Information
 
Gene Symbol
CYP21A2
 
Aliases
CA21H, CAH1, CPS1, CYP21, CYP21B, P450c21B
 
Entrez Gene ID
 
Gene Name
Cytochrome P450 family 21 subfamily A member 2
 
Chromosomal Location
6p21.33
 
HGNC ID
 
Summary
This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum and hydroxylates steroids at the 21 position. Its activity is required for the synthesis of steroid hormones including cortisol and aldosterone. Mutations in this gene cause congenital adrenal hyperplasia. A related pseudogene is located near this gene; gene conversion events involving the functional gene and the pseudogene are thought to account for many cases of steroid 21-hydroxylase deficiency. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]
 
RefSeq DNA
 
RefSeq mRNA
  e!Ensembl
Gene
Transcript
ENST00000448478, ENST00000496557, ENST00000473538, ENST00000466302, ENST00000460626, ENST00000468340, ENST00000496471, ENST00000475619, ENST00000459819, ENST00000434026, ENST00000489833, ENST00000383322, ENST00000469664, ENST00000460689, ENST00000496483, ENST00000492024, ENST00000467455, ENST00000461324, ENST00000465847, ENST00000383321, ENST00000466779, ENST00000486063, ENST00000479074, ENST00000479730, ENST00000480027, ENST00000483041, ENST00000478281, ENST00000488465, ENST00000471671, ENST00000435122, ENST00000644719, ENST00000469053, ENST00000464325, ENST00000466879, ENST00000462278, ENST00000456152, ENST00000487373, ENST00000487592, ENST00000493137, ENST00000472130, ENST00000495919, ENST00000466275, ENST00000474613, ENST00000466113, ENST00000452386, ENST00000448314, ENST00000480731, ENST00000494168, ENST00000468185, ENST00000470187, ENST00000477608, ENST00000469046, ENST00000486312, ENST00000480660, ENST00000452708, ENST00000436607, ENST00000496685, ENST00000489576, ENST00000464272, ENST00000460263, ENST00000493848, ENST00000497396, ENST00000462292, ENST00000494716, ENST00000448877
 
Protein

SNPs

SNP
SNP ID
Associated disease
References
Val281Leu
Precocious puberty
Gln318X
Premature pubarche
R356W
Premature pubarche
8bpdelE3
Premature pubarche
intron 2 splice
Premature pubarche

Gene Ontology (GO)

GO ID Ontology Function Evidence Reference
GO:0006694 Biological process Steroid biosynthetic process IBA 21873635
GO:0006694 Biological process Steroid biosynthetic process IDA 25855791
GO:0006704 Biological process Glucocorticoid biosynthetic process IBA 21873635
GO:0008202 Biological process Steroid metabolic process IMP 16984992
GO:0004509 Molecular function Steroid 21-monooxygenase activity IBA 21873635
Protein Information
 
Protein Name
Steroid 21-hydroxylase, 21-OHase, cytochrome P450 XXI, cytochrome P450, family 21, subfamily A, polypeptide 2, cytochrome P450, subfamily XXIA (steroid 21-hydroxylase, congenital adrenal hyperplasia), polypeptide 2, cytochrome P450-C21B, steroid 21 hydroxylase, steroid 21-monooxygenase
 
Function
Specifically catalyzes the 21-hydroxylation of steroids. Required for the adrenal synthesis of mineralocorticoids and glucocorticoids (PubMed:22014889).
 
Refseq Proteins
 
UniProt
 
PDB
Pathways
 
KEGG
 
Reactome
 

Steroid hormone biosynthesis
Metabolic pathways
Aldosterone synthesis and secretion
Cortisol synthesis and secretion
Cushing syndrome

 

Mineralocorticoid biosynthesis
Glucocorticoid biosynthesis
Endogenous sterols
Defective CYP21A2 causes Adrenal hyperplasia 3 (AH3)

     
References
 
 
PubMed ID Disease SNP/Mutation Study population Ethnicity Age of study population Type of sample
Precocious puberty 
Val281Leu  
Total patients- Test: 32 girls 
 
0.7- 7.7 years 
Blood
Premature pubarche 
V281L  
Total patients- 36 girls 
French of Mediterranean origin 
 
Blood
Premature pubarche 
P30L, I172N  
Girls:1 
 
Onset age - 3.5years  
Premature pubarche 
V281L, I172N, P30L, P453S, Q318X,  
Total Patients- 40 children (PP: 6 boys and 34 girls), 29 adolescent girls (hyperandrogenism), Controls- Women:15 (white) 
Black, White, Asian-white, Black-white 
Group 1 - 4.6-10.75 years, Group 2 - 10.4-18 years  
Blood
Premature pubarche 
V2181L, P453S, P30L, P482S  
Total Patients- 152 children (114 girls and 38 boys) 
Italian origin 
(before 8 years in girls and 9 years in boys 
Blood

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