4-76181016-G-A

Position:

chr4-76181016-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_005506.4(SCARB2):c.361C>T(p.Arg121*) variant causes a stop gained change. The variant allele was found at a frequency of 0.0000093 in 1,613,388 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 Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000075 ( 0 hom. )

Consequence

SCARB2
NM_005506.4 stop_gained

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3O:1

Conservation

PhyloP100: 5.33

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:

SCARB2 (HGNC:):

SCARB2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 4-76181016-G-A is Pathogenic according to our data. Variant chr4-76181016-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 206709.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCARB2	NM_005506.4 linkuse as main transcript	c.361C>T	p.Arg121*	stop_gained	3/12	ENST00000264896.8	NP_005497.1	Q14108-1A0A024RDG6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCARB2	ENST00000264896.8 linkuse as main transcript	c.361C>T	p.Arg121*	stop_gained	3/12	1	NM_005506.4	ENSP00000264896.2		Q14108-1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152030

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000797

AC:

AN:

251090

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135712

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000753

AC:

AN:

1461358

Hom.:

Cov.:

AF XY:

0.00000963

AC XY:

AN XY:

726978

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000989

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152030

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74262

show subpopulations

Gnomad4 AFR

AF:

0.0000483

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:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000427

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000330

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3476

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Action myoclonus-renal failure syndrome

Pathogenic:1Other:1

not provided, no classification provided	literature only	GeneReviews	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago	Mar 30, 2021	SCARB2 NM_005506.3 exon 3 p.Arg121* (c.361C>T): This variant has been reported in the literature in 1 individual with progressive myoclonus epilepsy (Fu 2014 PMID:23659519). This variant is present in 2/245924 alleles in the Genome Aggregation Database (http://gnomad.broadinstitute.org/rs200053119). Please note, disease causing variants may be present in control databases at low frequencies, reflective of the general population and/or variable expressivity. This variant is present in ClinVar (Variation ID:206709). Evolutionary conservation and computational predictive tools for this variant are limited or unavailable. This variant creates a premature stop at this codon which results in an absent or abnormal protein. Loss of function variants have been reported in association with disease for this gene (Amrom 2015 PMID:26677510). In summary, data on this variant is highly suspicious for disease, but requires further evidence for pathogenicity. Therefore, this variant classified as likely pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Mar 07, 2016

The R121X variant in the SCARB2 has been reported previously as a homozygous variant in an individual with progressive myoclonus epilepsy without renal failure (Fu et al., 2013). This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. -

Progressive myoclonic epilepsy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 19, 2022

This premature translational stop signal has been observed in individual(s) with progressive myoclonus epilepsy (PMID: 23659519). This variant is present in population databases (rs200053119, gnomAD 0.007%). This sequence change creates a premature translational stop signal (p.Arg121*) in the SCARB2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SCARB2 are known to be pathogenic (PMID: 19847901). ClinVar contains an entry for this variant (Variation ID: 206709). 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

0.48

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Uncertain

0.56

Eigen_PC

Uncertain

0.35

FATHMM_MKL

Uncertain

0.94

Vest4

0.86

GERP RS

3.0

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