CYP19A1

Gene Information
 
Gene Symbol
CYP19A1
 
Aliases
ARO, ARO1, CPV1, CYAR, CYP19, CYPXIX, P-450AROM
 
Entrez Gene ID
 
Gene Name
Cytochrome P450 family 19 subfamily A member 1
 
Chromosomal Location
15q21.2
 
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 catalyzes the last steps of estrogen biosynthesis. Mutations in this gene can result in either increased or decreased aromatase activity; the associated phenotypes suggest that estrogen functions both as a sex steroid hormone and in growth or differentiation. Alternative promoter use and alternative splicing results in multiple transcript variants that have different tissue specificities. [provided by RefSeq, Dec 2016]
 
RefSeq DNA
 
RefSeq mRNA
  e!Ensembl
Gene
Transcript  
Protein

SNPs

SNP
SNP ID
Associated disease
References
SNP60 - int 7_14A, IVS7 + 26, G-A
Premature pubarche
rs12907866 Premature pubarche
rs4646 Premature pubarche
rs2414096 Premature pubarche

Gene Ontology (GO)

GO ID Ontology Function Evidence Reference
GO:0006694 Biological process Steroid biosynthetic process TAS 2848247
GO:0006710 Biological process Androgen catabolic process IDA 26482249
GO:0008585 Biological process Female gonad development IBA 21873635
GO:0032355 Biological process Response to estradiol IBA 21873635
GO:2000866 Biological process Positive regulation of estradiol secretion IDA 26482249
Protein Information
 
Protein Name
Aromatase, cytochrome P-450AROM, cytochrome P450 19A1, cytochrome P450, family 19, subfamily A, polypeptide 1, cytochrome P450, subfamily XIX (aromatization of androgens), estrogen synthase, estrogen synthetase, flavoprotein-linked monooxygenase, microsomal monooxygenase
 
Function
A cytochrome P450 monooxygenase that catalyzes the conversion of C19 androgens, androst-4-ene-3,17-dione (androstenedione) and testosterone to the C18 estrogens, estrone and estradiol, respectively (PubMed:27702664, PubMed:2848247). Catalyzes three successive oxidations of C19 androgens: two conventional oxidations at C19 yielding 19-hydroxy and 19-oxo/19-aldehyde derivatives, followed by a third oxidative aromatization step that involves C1-beta hydrogen abstraction combined with cleavage of the C10-C19 bond to yield a phenolic A ring and formic acid (PubMed:20385561). Alternatively, the third oxidative reaction yields a 19-norsteroid and formic acid. Converts dihydrotestosterone to delta1,10-dehydro 19-nordihydrotestosterone and may play a role in homeostasis of this potent androgen (PubMed:22773874). Also displays 2-hydroxylase activity toward estrone (PubMed:22773874). Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (CPR; NADPH-ferrihemoprotein reductase) (PubMed:20385561, PubMed:22773874).
 
Refseq Proteins
 
UniProt
 
PDB
Pathways
 
KEGG
 
Reactome
 

Steroid hormone biosynthesis
Metabolic pathways
Ovarian steroidogenesis

 

Estrogen biosynthesis
Endogenous sterols
Defective CYP19A1 causes Aromatase excess syndrome (AEXS)

     
References
 
 
PubMed ID Disease SNP/Mutation Study population Ethnicity Age of study population Type of sample
Premature pubarche 
rs12907866, rs2414096, rs4646  
Group 1 - 186 girls with PP, Group 2 - 71 girls as controls, Group 3 - 224 women 
Group 1 & 2 - Barcelona-Spanish, Group 3 - 97% Caucasian 
Group 3 - mean age 21.5 years 

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