rs556794126

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1_ModeratePM2PP5_Very_Strong

The NM_000102.4(CYP17A1):c.1435_1438dupATCC(p.Pro480HisfsTer27) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000047 in 1,594,208 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000050 ( 0 hom. )

Consequence

CYP17A1
NM_000102.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:9

Conservation

PhyloP100: 2.75

Variant links:

Genes affected

CYP17A1 (HGNC:2593): (cytochrome P450 family 17 subfamily A member 1) 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. It has both 17alpha-hydroxylase and 17,20-lyase activities and is a key enzyme in the steroidogenic pathway that produces progestins, mineralocorticoids, glucocorticoids, androgens, and estrogens. Mutations in this gene are associated with isolated steroid-17 alpha-hydroxylase deficiency, 17-alpha-hydroxylase/17,20-lyase deficiency, pseudohermaphroditism, and adrenal hyperplasia. [provided by RefSeq, Jul 2008]

CYP17A1 links:

WBP1L (HGNC:23510): (WW domain binding protein 1 like) Predicted to enable ubiquitin protein ligase binding activity. Predicted to act upstream of or within CXCL12-activated CXCR4 signaling pathway; hemopoiesis; and positive regulation of protein ubiquitination. Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

WBP1L links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.0583 CDS is truncated, and there are 2 pathogenic variants in the truncated region.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 10-102830790-G-GGGAT is Pathogenic according to our data. Variant chr10-102830790-G-GGGAT is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1777.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP17A1	NM_000102.4 link	c.1435_1438dupATCC	p.Pro480HisfsTer27	frameshift_variant	Exon 8 of 8	ENST00000369887.4	NP_000093.1	P05093Q1HB44

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CYP17A1	ENST00000369887.4 link	c.1435_1438dupATCC	p.Pro480HisfsTer27	frameshift_variant	Exon 8 of 8	1	NM_000102.4	ENSP00000358903.3		P05093

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000252

AC:

AN:

237994

Hom.:

AF XY:

0.0000311

AC XY:

AN XY:

128802

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000562

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000499

AC:

AN:

1442048

Hom.:

Cov.:

AF XY:

0.0000599

AC XY:

AN XY:

717764

show subpopulations

Gnomad4 AFR exome

AF:

0.0000302

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000620

Gnomad4 OTH exome

AF:

0.0000503

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152160

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74338

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:5

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Feb 01, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Pro480Hisfs*27) in the CYP17A1 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 29 amino acid(s) of the CYP17A1 protein. This variant is present in population databases (rs556794126, gnomAD 0.005%). This premature translational stop signal has been observed in individuals with congenital adrenal hyperplasia (PMID: 1577471, 2786493). ClinVar contains an entry for this variant (Variation ID: 1777). For these reasons, this variant has been classified as Pathogenic. -

Jun 23, 2017

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1435_1438dupATCC variant has been reported previously in the homozygous state in association with 17 alpha-hydroxylase/17,20-lyase deficiency (Kagimoto et al., 1988; Kagimoto et al., 1989; Imai et al., 1992). The duplication causes a frameshift starting with codon Proline 480, changes this amino acid to a Histidine residue and creates a premature Stop codon at position 27 of the new reading frame, denoted p.Pro480HisfsX27. This variant is predicted to cause loss of normal protein function through protein truncation. The variant is not observed at a significant frequency in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). In summary, we consider this variant to be pathogenic. -

Deficiency of steroid 17-alpha-monooxygenase

Pathogenic:2

Feb 09, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 09, 2018

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Pro480HisfsX27 variant in CYP17A1 has been reported in 7 individuals with 17 alpha-hydroxylase/17,20-lyase deficiency and segregated with disease in 2 aff ected family members from 2 families (Kagimoto 1988, Kagimoto 1989, Imai 1992). It has also been identified in 5/104972 of European chromosomes by gnomAD (http: //gnomad.broadinstitute.org). This variant is predicted to cause a frameshift, w hich alters the protein?s amino acid sequence beginning at position 480 and lead s to a premature termination codon 27 amino acids downstream. This termination c odon occurs within the terminal 50 bases of the second to the last exon and is t herefore likely to escape nonsense mediated decay (NMD) and result in a truncate d protein. In summary, although additional studies are required to fully establi sh its clinical significance, the p.Pro480HisfsX27 variant is likely pathogenic. ACMG/AMP criteria applied: PM2, PM3, PVS1_Moderate, PP1_Moderate. -

17-alpha-hydroxylase/17,20-lyase deficiency, combined complete

Pathogenic:1

Apr 01, 1992

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Congenital adrenal hyperplasia

Pathogenic:1

May 20, 2022

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: CYP17A1 c.1435_1438dupATCC (p.Pro480HisfsX27) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant allele was found at a frequency of 2.5e-05 in 237994 control chromosomes. c.1435_1438dupATCC has been reported in the literature in multiple individuals affected with Congenital Adrenal Hyperplasia (example Kagimoto_1988, Kagimoto-1989, Perez_2004). These data indicate that the variant is very likely to be associated with disease. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation.Two laboratories classified the variant as pathogenic, one as likely pathogenic, and one classified it VUS. Based on the evidence outlined above, the variant was classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over