rs149474488

Positions:

chr4-76163361-G-A

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2BP4_ModerateBS1_Supporting

The ENST00000264896.8(SCARB2):c.1262C>T(p.Thr421Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000193 in 1,614,144 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. T421T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00020 ( 1 hom. )

Consequence

SCARB2
ENST00000264896.8 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 1.77

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:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.14094993).

BS1

Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.000199 (291/1461868) while in subpopulation EAS AF= 0.000655 (26/39698). AF 95% confidence interval is 0.000458. There are 1 homozygotes in gnomad4_exome. There are 147 alleles in male gnomad4_exome subpopulation. Median coverage is 30. 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/exons	MANE	Protein
SCARB2	NM_005506.4 linkuse as main transcript	c.1262C>T	p.Thr421Met	missense_variant	11/12	ENST00000264896.8	NP_005497.1
SCARB2	NM_001204255.2 linkuse as main transcript	c.833C>T	p.Thr278Met	missense_variant	8/9		NP_001191184.1
SCARB2	XM_047416429.1 linkuse as main transcript	c.788C>T	p.Thr263Met	missense_variant	11/12		XP_047272385.1
SCARB2	XM_047416430.1 linkuse as main transcript	c.788C>T	p.Thr263Met	missense_variant	11/12		XP_047272386.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCARB2	ENST00000264896.8 linkuse as main transcript	c.1262C>T	p.Thr421Met	missense_variant	11/12	1	NM_005506.4	ENSP00000264896	P4	Q14108-1
	ENST00000651366.1 linkuse as main transcript	n.102+14095G>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152158

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000162

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000235

AC:

AN:

251434

Hom.:

AF XY:

0.000191

AC XY:

AN XY:

135890

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.000665

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000272

Gnomad SAS exome

AF:

0.0000980

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000229

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000199

AC:

291

AN:

1461868

Hom.:

Cov.:

AF XY:

0.000202

AC XY:

147

AN XY:

727234

show subpopulations

Gnomad4 AFR exome

AF:

0.000119

Gnomad4 AMR exome

AF:

0.000581

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000655

Gnomad4 SAS exome

AF:

0.0000696

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000200

Gnomad4 OTH exome

AF:

0.000116

GnomAD4 genome

AF:

0.000131

AC:

AN:

152276

Hom.:

Cov.:

AF XY:

0.000202

AC XY:

AN XY:

74438

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.000327

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000162

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000116

Hom.:

Bravo

AF:

0.000125

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000272

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:4

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 28, 2024	Reported previously as a variant of uncertain significance in three patients with Parkinson's disease and one control sample; however, no further clinical or segregation information was provided (PMID: 34867278); In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 34867278) -
Uncertain significance, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 30, 2015	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Athena Diagnostics	Oct 17, 2017	- -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 29, 2021

The c.1262C>T (p.T421M) alteration is located in exon 11 (coding exon 11) of the SCARB2 gene. This alteration results from a C to T substitution at nucleotide position 1262, causing the threonine (T) at amino acid position 421 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Action myoclonus-renal failure syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Dec 21, 2021

- -

Progressive myoclonic epilepsy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 17, 2022

This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 421 of the SCARB2 protein (p.Thr421Met). This variant is present in population databases (rs149474488, gnomAD 0.07%). 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: 206716). 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 not expected to disrupt SCARB2 protein function. 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

Benign

0.14

BayesDel_addAF

Benign

-0.32

BayesDel_noAF

Benign

-0.32

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.24

T;.;.;.;.;.;.;.

Eigen

Benign

0.085

Eigen_PC

Benign

0.032

FATHMM_MKL

Benign

0.72

LIST_S2

Uncertain

0.93

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

M_CAP

Uncertain

0.15

MetaRNN

Benign

0.14

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

MetaSVM

Benign

-0.56

MutationAssessor

Benign

1.9

L;.;.;.;.;.;.;.

MutationTaster

Benign

0.57

N;N

PrimateAI

Benign

0.39

PROVEAN

Benign

-2.3

N;.;.;.;.;.;N;.

REVEL

Benign

0.27

Sift

Uncertain

0.0030

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

Sift4G

Uncertain

0.0020

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

Polyphen

0.99

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

Vest4

0.42

MVP

0.71

MPC

0.67

ClinPred

0.31

GERP RS

2.1

Varity_R

0.089

gMVP

0.61

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