rs80358216

Positions:

• chr1-119422013-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_000198.4(HSD3B2):​c.512G>A​(p.Trp171Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,826 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 Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: HSD3B2 NM_000198.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 0.840

Genes affected

HSD3B2 (HGNC:5218): (hydroxy-delta-5-steroid dehydrogenase, 3 beta- and steroid delta-isomerase 2) The protein encoded by this gene is a bifunctional enzyme that catalyzes the oxidative conversion of delta(5)-ene-3-beta-hydroxy steroid, and the oxidative conversion of ketosteroids. It plays a crucial role in the biosynthesis of all classes of hormonal steroids. This gene is predominantly expressed in the adrenals and the gonads. Mutations in this gene are associated with 3-beta-hydroxysteroid dehydrogenase, type II, deficiency. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 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. There are 18 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-119422013-G-A is Pathogenic according to our data. Variant chr1-119422013-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 12184.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HSD3B2	NM_000198.4	c.512G>A	p.Trp171Ter	stop_gained	4/4	ENST00000369416.4	NP_000189.1
HSD3B2	NM_001166120.2	c.512G>A	p.Trp171Ter	stop_gained	4/4		NP_001159592.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HSD3B2	ENST00000369416.4	c.512G>A	p.Trp171Ter	stop_gained	4/4	1	NM_000198.4	ENSP00000358424	P1
HSD3B2	ENST00000543831.5	c.512G>A	p.Trp171Ter	stop_gained	4/4	3		ENSP00000445122	P1
HSD3B2	ENST00000433745.5	c.512G>A	p.Trp171Ter	stop_gained	4/4	3		ENSP00000388292
HSD3B2	ENST00000448448.2	n.456G>A		non_coding_transcript_exon_variant	3/3	5

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461826 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727216

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: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

3 beta-Hydroxysteroid dehydrogenase deficiency Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Jul 01, 1992	- -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Oct 12, 2021	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 01, 2023

ClinVar contains an entry for this variant (Variation ID: 12184). For these reasons, this variant has been classified as Pathogenic. This variant disrupts the C-terminus of the HSD3B2 protein, which has been demonstrated to be critical for enzymatic activity (PMID: 1825279). While functional studies have not been performed to directly test the effect of this variant on HSD3B2 protein function, this suggests that disruption of this region of the protein is causative of disease. This premature translational stop signal has been observed in individual(s) with adrenal hyperplasia (PMID: 1363812, 27626911). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Trp171*) in the HSD3B2 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 202 amino acid(s) of the HSD3B2 protein. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Uncertain	0.010
CADD	Pathogenic	33
DANN	Benign	0.96
Eigen	Benign	0.12
Eigen_PC	Benign	-0.27
FATHMM_MKL	Benign	0.036	N
MutationTaster	Benign	1.0	A;A
Vest4		0.54
GERP RS		0.28

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: rs80358216; hg19: chr1-119964636;