4-76195788-T-C

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4BS1_Supporting

The NM_005506.4(SCARB2):c.194A>G(p.Tyr65Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0002 in 1,613,782 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00020 ( 0 hom. )

Consequence

SCARB2
NM_005506.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 5.83

Variant links:

Genes affected

SCARB2 (HGNC:1665): (scavenger receptor class B member 2) The protein encoded by this gene is a type III glycoprotein that is located primarily in limiting membranes of lysosomes and endosomes. Earlier studies in mice and rat suggested that this protein may participate in membrane transportation and the reorganization of endosomal/lysosomal compartment. The protein deficiency in mice was reported to impair cell membrane transport processes and cause pelvic junction obstruction, deafness, and peripheral neuropathy. Further studies in human showed that this protein is a ubiquitously expressed protein and that it is involved in the pathogenesis of HFMD (hand, foot, and mouth disease) caused by enterovirus-71 and possibly by coxsackievirus A16. Mutations in this gene caused an autosomal recessive progressive myoclonic epilepsy-4 (EPM4), also known as action myoclonus-renal failure syndrome (AMRF). Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Feb 2011]

SCARB2 links:

ENSG00000286074 (HGNC:):

ENSG00000286074 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.26622885).

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.000158 (24/152260) while in subpopulation SAS AF= 0.00186 (9/4828). AF 95% confidence interval is 0.000972. There are 0 homozygotes in gnomad4. There are 14 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCARB2	NM_005506.4 link	c.194A>G	p.Tyr65Cys	missense_variant	Exon 2 of 12	ENST00000264896.8	NP_005497.1	Q14108-1A0A024RDG6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCARB2	ENST00000264896.8 link	c.194A>G	p.Tyr65Cys	missense_variant	Exon 2 of 12	1	NM_005506.4	ENSP00000264896.2		Q14108-1

Frequencies

GnomAD3 genomes

AF:

0.000164

AC:

AN:

152142

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:

0.00207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000221

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000290

AC:

AN:

251420

Hom.:

AF XY:

0.000346

AC XY:

AN XY:

135880

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00183

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000114

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000205

AC:

299

AN:

1461522

Hom.:

Cov.:

AF XY:

0.000264

AC XY:

192

AN XY:

727098

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.000112

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00180

Gnomad4 FIN exome

AF:

0.0000374

Gnomad4 NFE exome

AF:

0.000109

Gnomad4 OTH exome

AF:

0.000199

GnomAD4 genome

AF:

0.000158

AC:

AN:

152260

Hom.:

Cov.:

AF XY:

0.000188

AC XY:

AN XY:

74448

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:

0.00186

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000221

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000145

Hom.:

Bravo

AF:

0.000106

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000329

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000218

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Action myoclonus-renal failure syndrome

Uncertain:3

Feb 05, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 07, 2021

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Neuberg Centre For Genomic Medicine, NCGM

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The missense c.194A>G p.Tyr65Cys variant in SCARB2 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The p.Tyr65Cys variant is present with allele frequency of 0.03% in gnomAD Exomes. This variant has been submitted to the ClinVar database as Uncertain Significance multiple submissions. Multiple lines of computational evidence Polyphen - Probably Damaging, SIFT - Damaging and MutationTaster - Disease causing predict a damaging effect on protein structure and function for this variant. The reference amino acid at this position in SCARB2 is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. The amino acid Tyr at position 65 is changed to a Cys changing protein sequence and it might alter its composition and physico-chemical properties. For these reasons, this variant has been classified as a Variant of Uncertain Significance VUS. In absence of another reportable variant in SCARB2 gene, the molecular diagnosis is not confirmed. -

not provided

Uncertain:1

Sep 24, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Progressive myoclonic epilepsy

Uncertain:1

Jan 22, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 65 of the SCARB2 protein (p.Tyr65Cys). This variant is present in population databases (rs138955932, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with SCARB2-related conditions. ClinVar contains an entry for this variant (Variation ID: 206708). 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 SCARB2 protein function with a positive predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.44

BayesDel_addAF

Uncertain

0.084

BayesDel_noAF

Pathogenic

0.33

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.81

D;.;.;.;.;.;.

Eigen

Uncertain

0.53

Eigen_PC

Uncertain

0.45

FATHMM_MKL

Uncertain

0.92

LIST_S2

Pathogenic

0.99

D;D;D;D;D;D;D

M_CAP

Uncertain

0.19

MetaRNN

Benign

0.27

T;T;T;T;T;T;T

MetaSVM

Uncertain

0.79

MutationAssessor

Pathogenic

3.5

H;.;.;.;.;H;.

PrimateAI

Uncertain

0.61

PROVEAN

Pathogenic

-7.4

D;.;.;.;.;D;.

REVEL

Pathogenic

0.88

Sift

Uncertain

0.0010

D;.;.;.;.;D;.

Sift4G

Pathogenic

0.0010

D;.;.;.;.;D;.

Polyphen

1.0

D;.;.;.;.;.;.

Vest4

0.97

MVP

0.92

MPC

0.97

ClinPred

0.70

GERP RS

4.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.97

gMVP

0.88

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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