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CYP21A1P cytochrome P450 family 21 subfamily A member 1, pseudogene [ Homo sapiens (human) ]

Gene ID: 1590, updated on 19-Aug-2025
Official Symbol
CYP21A1Pprovided by HGNC
Official Full Name
cytochrome P450 family 21 subfamily A member 1, pseudogeneprovided by HGNC
Primary source
HGNC:HGNC:2599
See related
Ensembl:ENSG00000290788 AllianceGenome:HGNC:2599
Gene type
pseudo
RefSeq status
VALIDATED
Organism
Homo sapiens
Lineage
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo
Also known as
CYP21A; CYP21P; P450c21A
Expression
Biased expression in adrenal (RPKM 198.1) and fat (RPKM 7.0) See more
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See CYP21A1P in Genome Data Viewer
Location:
6p21.33
Exon count:
8
Annotation release Status Assembly Chr Location
RS_2025_08 current GRCh38.p14 (GCF_000001405.40) 6 NC_000006.12 (32005636..32008909)
RS_2025_08 current T2T-CHM13v2.0 (GCF_009914755.1) 6 NC_060930.1 (31858842..31862115)
RS_2024_09 previous assembly GRCh37.p13 (GCF_000001405.25) 6 NC_000006.11 (31973413..31976686)

Chromosome 6 - NC_000006.12Genomic Context describing neighboring genes Neighboring gene H3K27ac-H3K4me1 hESC enhancer GRCh37_chr6:31939702-31940412 Neighboring gene decapping exoribonuclease Neighboring gene winged helix repair factor 1 Neighboring gene complement C4A (Chido/Rodgers blood group) Neighboring gene CYP21A1P recombination region Neighboring gene tenascin XA (pseudogene) recombination region Neighboring gene tenascin XA (pseudogene) Neighboring gene winged helix repair factor 1B (pseudogene) Neighboring gene complement C4B (Chido/Rodgers blood group) Neighboring gene CYP21A2 5' regulatory region

Go to nucleotide: Graphics FASTA GenBank

  • Project title: Tissue-specific circular RNA induction during human fetal development
  • Description: 35 human fetal samples from 6 tissues (3 - 7 replicates per tissue) collected between 10 and 20 weeks gestational time were sequenced using Illumina TruSeq Stranded Total RNA
  • BioProject: PRJNA270632
  • Publication: PMID 26076956
  • Analysis date: Mon Apr 2 22:54:59 2018

Related articles in PubMed

  1. High-Throughput Screening for CYP21A1P-TNXA/TNXB Chimeric Genes Responsible for Ehlers-Danlos Syndrome in Patients with Congenital Adrenal Hyperplasia. Lao Q, et al. J Mol Diagn, 2019 Sep. PMID 31229653, Free PMC Article
  2. Analysis of the CYP21A1P pseudogene: indication of mutational diversity and CYP21A2-like and duplicated CYP21A2 genes. Tsai LP, et al. Anal Biochem, 2011 Jun 15. PMID 21324303
  3. Estimation of the false-negative rate in newborn screening for congenital adrenal hyperplasia. Votava F, et al. Eur J Endocrinol, 2005 Jun. PMID 15941926
  4. Molecular characterization of the HLA-linked steroid 21-hydroxylase B gene from an individual with congenital adrenal hyperplasia. Rodrigues NR, et al. EMBO J, 1987 Jun. PMID 3038528, Free PMC Article
  5. Complete nucleotide sequence of two steroid 21-hydroxylase genes tandemly arranged in human chromosome: a pseudogene and a genuine gene. Higashi Y, et al. Proc Natl Acad Sci U S A, 1986 May. PMID 3486422, Free PMC Article

See all (25) citations in PubMed

GeneRIFs: Gene References Into Functions

What's a GeneRIF?
  1. A contiguous gene deletion involving the adjacent CYP21A2 and TNXB genes are associated with Ehlers-Danlos Syndrome in Patients with Congenital Adrenal Hyperplasia.
    Title: High-Throughput Screening for CYP21A1P-TNXA/TNXB Chimeric Genes Responsible for Ehlers-Danlos Syndrome in Patients with Congenital Adrenal Hyperplasia.
  2. The variants reveal that traditional recognition of CYP21A1P gene based on the TaqI fragment size analysis may lead to misinterpretation and interfere with the molecular diagnosis of congenital adrenal hyperplasia due to 21-hydroxylase deficiency.
    Title: Variants of the CYP21A2 and CYP21A1P genes in congenital adrenal hyperplasia.
  3. Pseudogene of the CYP21A1P mutation presents diverse variants. it may be misdiagnosed by previously established methods for congenital adrenal hyperplasia caused by a 21-hydroxylase deficiency.
    Title: Analysis of the CYP21A1P pseudogene: indication of mutational diversity and CYP21A2-like and duplicated CYP21A2 genes.
  4. Chimeric CYP21A1P/CYP21A2 genes were present in 171 out of 508 mutated CYP21A2 alleles (33.8%).
    Title: Chimeric CYP21A1P/CYP21A2 genes identified in Czech patients with congenital adrenal hyperplasia.
  5. We describe a new CYP21A1P/CYP21A2 chimera (CH-6), associated with the HLA-B15, DR13 haplotype, in a young Italian congenital adrenal hyperplasia patient
    Title: A new CYP21A1P/CYP21A2 chimeric gene identified in an Italian woman suffering from classical congenital adrenal hyperplasia form.
  6. demonstration of diversity associated with gene copy-number variation of complement C4, CYP21 & tenascin; also offers an explanation for low prevalence of systemic lupus erythematosus but high incidence of congenital adrenal hyperplasia in Asian-Indians
    Title: Great genotypic and phenotypic diversities associated with copy-number variations of complement C4 and RP-C4-CYP21-TNX (RCCX) modules: a comparison of Asian-Indian and European American populations.
  7. Observational study of genetic testing. (HuGE Navigator)
    Title: Estimation of the false-negative rate in newborn screening for congenital adrenal hyperplasia.
  8. Observational study of gene-disease association. (HuGE Navigator)
    Title: The gene founder effect of two spontaneous mutations in ethnic Chinese (Taiwanese) CAH patients with 21-hydroxylase deficiency.
  9. Observational study of genotype prevalence. (HuGE Navigator)
    Title: Linkage analysis of the C4A/C4B copy number variation and polymorphisms of the adjacent steroid 21-hydroxylase gene in a healthy population.
  10. There are ethnic-specific mutations in the CYP21A2 gene.
    Title: Ethnic-specific distribution of mutations in 716 patients with congenital adrenal hyperplasia owing to 21-hydroxylase deficiency.
Submit: New GeneRIF Correction See all GeneRIFs (12)

Review eQTL and phenotype association data in this region using PheGenI

EBI GWAS Catalog

Description
Identification of 23 new prostate cancer susceptibility loci using the iCOGS custom genotyping array.
EBI GWAS Catalog

See studies and variants in dbVar

See Variation Viewer (GRCh37.p13)

See Variation Viewer (GRCh38)

Markers

Other Names

  • cytochrome P450, family 21, subfamily A, polypeptide 1 pseudogene
  • cytochrome P450, subfamily XXI (steroid 21-hydroxylase) pseudogene
  • cytochrome P450, subfamily XXIA (steroid 21-hydroxylase), polypeptide 1 pseudogene

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RefSeqs maintained independently of Annotated Genomes

These reference sequences exist independently of genome builds. Explain

These reference sequences are curated independently of the genome annotation cycle, so their versions may not match the RefSeq versions in the current genome build. Identify version mismatches by comparing the version of the RefSeq in this section to the one reported in Genomic regions, transcripts, and products above.

RNA

  1. NR_040090.1 RNA Sequence

    Status: VALIDATED

    Source sequence(s)
    AL645922
    Related
    ENST00000342991.10

RefSeqs of Annotated Genomes: GCF_000001405.40-RS_2025_08

The following sections contain reference sequences that belong to a specific genome build. Explain

Reference GRCh38.p14 Primary Assembly

Genomic

  1. NC_000006.12 Reference GRCh38.p14 Primary Assembly

    Range
    32005636..32008909
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

Reference GRCh38.p14 ALT_REF_LOCI_3

Genomic

  1. NT_167245.2 Reference GRCh38.p14 ALT_REF_LOCI_3

    Range
    3253411..3256684
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

Reference GRCh38.p14 ALT_REF_LOCI_7

Genomic

  1. NT_167249.2 Reference GRCh38.p14 ALT_REF_LOCI_7

    Range
    3306825..3310098
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

Alternate T2T-CHM13v2.0

Genomic

  1. NC_060930.1 Alternate T2T-CHM13v2.0

    Range
    31858842..31862115
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

Suppressed Reference Sequence(s)

The following Reference Sequences have been suppressed. Explain

  1. NG_001111.1: Suppressed sequence

    Description
    NG_001111.1: This RefSeq was permanently suppressed since this pseudogene is currently represented on a region reference sequence for the bimodular haplotype of the MHC class III complement gene cluster on chr 6.
Nucleotide Protein
Heading Accession and Version

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