1-119422310-T-C

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_000198.4(HSD3B2):c.809T>C(p.Ile270Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000701 in 1,614,118 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. I270I) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00040 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00073 ( 1 hom. )

Consequence

HSD3B2
NM_000198.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7B:1

Conservation

PhyloP100: -0.571

Variant links:

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]

HSD3B2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.026067734).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HSD3B2	NM_000198.4 link	c.809T>C	p.Ile270Thr	missense_variant	Exon 4 of 4	ENST00000369416.4	NP_000189.1	P26439-1A0A024R0F9
HSD3B2	NM_001166120.2 link	c.809T>C	p.Ile270Thr	missense_variant	Exon 4 of 4		NP_001159592.1	P26439-1A0A024R0F9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
HSD3B2	ENST00000369416.4 link	c.809T>C	p.Ile270Thr	missense_variant	Exon 4 of 4	1	NM_000198.4	ENSP00000358424.3	P26439-1
HSD3B2	ENST00000543831.5 link	c.809T>C	p.Ile270Thr	missense_variant	Exon 4 of 4	3		ENSP00000445122.1	P26439-1
HSD3B2	ENST00000433745.5 link	c.*222T>C		downstream_gene_variant		3		ENSP00000388292.1	Q5QP01

Frequencies

GnomAD3 genomes

AF:

0.000401

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000764

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000458

AC:

115

AN:

251256

Hom.:

AF XY:

0.000427

AC XY:

AN XY:

135800

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000397

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000907

Gnomad OTH exome

AF:

0.000653

GnomAD4 exome

AF:

0.000732

AC:

1070

AN:

1461828

Hom.:

Cov.:

AF XY:

0.000714

AC XY:

519

AN XY:

727224

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.000536

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000374

Gnomad4 NFE exome

AF:

0.000918

Gnomad4 OTH exome

AF:

0.000464

GnomAD4 genome

AF:

0.000401

AC:

AN:

152290

Hom.:

Cov.:

AF XY:

0.000363

AC XY:

AN XY:

74450

show subpopulations

Gnomad4 AFR

AF:

0.000144

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000764

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000651

Hom.:

Bravo

AF:

0.000385

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.00104

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000698

AC:

ExAC

AF:

0.000354

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000545

EpiControl

AF:

0.000652

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

3 beta-Hydroxysteroid dehydrogenase deficiency

Uncertain:3

Nov 24, 2023

Zotz-Klimas Genetics Lab, MVZ Zotz Klimas

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Apr 27, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:2Benign:1

Nov 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

HSD3B2: PM2, BP4 -

Nov 05, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

not specified

Uncertain:1

Dec 07, 2023

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: HSD3B2 c.809T>C (p.Ile270Thr) results in a non-conservative amino acid change located in the 3-beta hydroxysteroid dehydrogenase/isomerase domain (IPR00225) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00046 in 251256 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in HSD3B2 causing Congenital Adrenal Hyperplasia (0.00046 vs 0.0013), allowing no conclusion about variant significance. c.809T>C has been reported in the literature in at least one individual affected with clinical features of Congenital Adrenal Hyperplasia. However, this report does not provide unequivocal conclusions about association of the variant with Congenital Adrenal Hyperplasia. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication has been ascertained in the context of this evaluation (PMID: 30668521). Five submitters have cited clinical-significance assessments for this variant to ClinVar after 2014; all submitters classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

HSD3B2-related disorder

Uncertain:1

Feb 01, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The HSD3B2 c.809T>C variant is predicted to result in the amino acid substitution p.Ile270Thr. This variant was reported in an individual with hypogonadism in a disorder of sex development study, but the clinical significance was unknown (Hughes et al. 2019. PubMed ID: 30668521). This variant is reported in 0.084% of alleles in individuals of European (Non-Finnish) descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.46

CADD

Benign

0.0010

DANN

Benign

0.17

DEOGEN2

Benign

0.27

T;T

Eigen

Benign

-1.8

Eigen_PC

Benign

-1.9

FATHMM_MKL

Benign

0.010

LIST_S2

Benign

0.011

T;.

M_CAP

Benign

0.017

MetaRNN

Benign

0.026

T;T

MetaSVM

Benign

-0.81

MutationAssessor

Benign

-1.3

N;N

PrimateAI

Benign

0.26

PROVEAN

Benign

1.8

N;N

REVEL

Benign

0.22

Sift

Benign

1.0

T;T

Sift4G

Benign

0.64

T;T

Polyphen

0.0

B;B

Vest4

0.27

MVP

0.83

MPC

0.32

ClinPred

0.010

GERP RS

-8.0

Varity_R

0.025

gMVP

0.32

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

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