16-30985737-C-T

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_StrongPM2PP5_Moderate

The NM_025193.4(HSD3B7):c.79C>T(p.Arg27*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000392 in 1,607,942 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: 𝑓 0.000026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000041 ( 0 hom. )

Consequence

HSD3B7
NM_025193.4 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, single submitter P:2

Conservation

PhyloP100: 0.242

Variant links:

Genes affected

HSD3B7 (HGNC:18324): (hydroxy-delta-5-steroid dehydrogenase, 3 beta- and steroid delta-isomerase 7) This gene encodes an enzyme which is involved in the initial stages of the synthesis of bile acids from cholesterol and a member of the short-chain dehydrogenase/reductase superfamily. The encoded protein is a membrane-associated endoplasmic reticulum protein which is active against 7-alpha hydrosylated sterol substrates. Mutations in this gene are associated with a congenital bile acid synthesis defect which leads to neonatal cholestasis, a form of progressive liver disease. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2008]

HSD3B7 links:

ENSG00000279196 (HGNC:):

ENSG00000279196 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 10 pathogenic variants in the truncated region.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 16-30985737-C-T is Pathogenic according to our data. Variant chr16-30985737-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 3345116.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HSD3B7	NM_025193.4 link	c.79C>T	p.Arg27*	stop_gained	Exon 2 of 7	ENST00000297679.10	NP_079469.2	Q9H2F3-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HSD3B7	ENST00000297679.10 link	c.79C>T	p.Arg27*	stop_gained	Exon 2 of 7	1	NM_025193.4	ENSP00000297679.5		Q9H2F3-1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152248

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:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000253

AC:

AN:

237074

Hom.:

AF XY:

0.0000388

AC XY:

AN XY:

128826

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:

0.0000682

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000376

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000405

AC:

AN:

1455694

Hom.:

Cov.:

AF XY:

0.0000414

AC XY:

AN XY:

723832

show subpopulations

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:

0.0000235

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000513

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152248

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74364

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:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000548

Hom.:

Bravo

AF:

0.0000113

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

HSD3B7-related disorder

Pathogenic:1

Jun 27, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The HSD3B7 c.79C>T variant is predicted to result in premature protein termination (p.Arg27*). This variant was reported in the homozygous state in an individual with intrahepatic cholestasis (Supp. Table 1, Gorukmez et al. 2023. PubMed ID: 36964972). This variant is reported in 0.0068% of alleles in individuals of South Asian descent in gnomAD. Nonsense variants in HSD3B7 are expected to be pathogenic. This variant is interpreted as pathogenic. -

not provided

Pathogenic:1

Sep 11, 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.Arg27*) in the HSD3B7 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in HSD3B7 are known to be pathogenic (PMID: 12679481). This variant is present in population databases (rs139399987, gnomAD 0.007%). This premature translational stop signal has been observed in individual(s) with cholestasis (PMID: 36964972). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.50

BayesDel_noAF

Pathogenic

0.30

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Uncertain

0.35

Eigen_PC

Benign

0.13

FATHMM_MKL

Benign

0.37

Vest4

0.12

GERP RS

2.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.17

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