rs104894137

Positions:

• chr10-102832626-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_000102.4(CYP17A1):​c.1024C>A​(p.Pro342Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000619 in 1,452,810 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: CYP17A1 NM_000102.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 9.45

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 (HGNC:):

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.988
• PP5: Variant 10-102832626-G-T is Pathogenic according to our data. Variant chr10-102832626-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1783.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CYP17A1	NM_000102.4	c.1024C>A	p.Pro342Thr	missense_variant	6/8	ENST00000369887.4	NP_000093.1
CYP17A1-AS1	XR_428804.2	n.-50G>T		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CYP17A1	ENST00000369887.4	c.1024C>A	p.Pro342Thr	missense_variant	6/8	1	NM_000102.4	ENSP00000358903.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000619 AC: 9 AN: 1452810 Hom.: 0 Cov.: 28 AF XY: 0.00000691 AC XY: 5 AN XY: 723438

Gnomad4 AFR exome AF: 0.00

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: 0.00000815

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

17-alpha-hydroxylase/17,20-lyase deficiency, combined partial Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Mar 01, 1992

- -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 30, 2023

This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 342 of the CYP17A1 protein (p.Pro342Thr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with partial combined 17-alphahydroxylase/17,20-lyase deficiency (PMID: 1740503). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 1783). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt CYP17A1 protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects CYP17A1 function (PMID: 1740503). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.86
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.81	.;.;D;.;.
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.92	D;D;D;D;D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D
MetaSVM	Uncertain	0.13	D
MutationAssessor	Pathogenic	3.9	.;.;H;.;.
PrimateAI	Uncertain	0.51	T
PROVEAN	Pathogenic	-7.1	.;.;D;.;.
REVEL	Pathogenic	0.73
Sift	Uncertain	0.014	.;.;D;.;.
Sift4G	Uncertain	0.017	.;.;D;.;.
Polyphen		0.99	.;.;D;.;.
Vest4		0.95
MutPred		0.96		.;.;Gain of catalytic residue at P342 (P = 0.0419);.;Gain of catalytic residue at P342 (P = 0.0419);
MVP		0.92
MPC		0.99
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.92
gMVP		0.89

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs104894137; hg19: chr10-104592383;