X-133953061-G-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_ModerateBS1_Supporting

The NM_004484.4(GPC3):c.326C>A(p.Ala109Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000058 in 1,206,722 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A109V) has been classified as Benign.

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 0 hem., cov: 23)

Exomes 𝑓: 0.0000046 ( 0 hom. 1 hem. )

Consequence

GPC3
NM_004484.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 9.36

Publications

1 publications found

Variant links:

Genes affected

GPC3 (HGNC:4451): (glypican 3) Cell surface heparan sulfate proteoglycans are composed of a membrane-associated protein core substituted with a variable number of heparan sulfate chains. Members of the glypican-related integral membrane proteoglycan family (GRIPS) contain a core protein anchored to the cytoplasmic membrane via a glycosyl phosphatidylinositol linkage. These proteins may play a role in the control of cell division and growth regulation. The protein encoded by this gene can bind to and inhibit the dipeptidyl peptidase activity of CD26, and it can induce apoptosis in certain cell types. Deletion mutations in this gene are associated with Simpson-Golabi-Behmel syndrome, also known as Simpson dysmorphia syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2009]

GPC3 Gene-Disease associations (from GenCC):

Simpson-Golabi-Behmel syndrome
Inheritance: XL Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
Simpson-Golabi-Behmel syndrome type 1
Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics

GPC3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.25424942).

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.0000179 (2/111671) while in subpopulation SAS AF = 0.000754 (2/2652). AF 95% confidence interval is 0.000134. There are 0 homozygotes in GnomAd4. There are 0 alleles in the male GnomAd4 subpopulation. Median coverage is 23. This position passed quality control check. 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
GPC3	NM_004484.4 link	c.326C>A	p.Ala109Glu	missense_variant	Exon 2 of 8	ENST00000370818.8	NP_004475.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPC3	ENST00000370818.8 link	c.326C>A	p.Ala109Glu	missense_variant	Exon 2 of 8	1	NM_004484.4	ENSP00000359854.3

Frequencies

GnomAD3 genomes

AF:

0.0000179

AC:

AN:

111671

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:

0.000754

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000164

AC:

AN:

183225

AF XY:

0.0000148

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000457

AC:

AN:

1095051

Hom.:

Cov.:

AF XY:

0.00000277

AC XY:

AN XY:

360573

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26344

American (AMR)

AF:

0.00

AC:

AN:

35205

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19378

East Asian (EAS)

AF:

0.00

AC:

AN:

30185

South Asian (SAS)

AF:

0.0000740

AC:

AN:

54067

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40493

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4125

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

839267

Other (OTH)

AF:

0.0000217

AC:

AN:

45987

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000179

AC:

AN:

111671

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33855

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30697

American (AMR)

AF:

0.00

AC:

AN:

10489

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2649

East Asian (EAS)

AF:

0.00

AC:

AN:

3575

South Asian (SAS)

AF:

0.000754

AC:

AN:

2652

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6038

Middle Eastern (MID)

AF:

0.00

AC:

AN:

239

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

53153

Other (OTH)

AF:

0.00

AC:

AN:

1496

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.550

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Wilms tumor 1

Uncertain:1

Apr 29, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with glutamic acid, which is acidic and polar, at codon 109 of the GPC3 protein (p.Ala109Glu). This variant is present in population databases (rs761660909, gnomAD 0.02%), including at least one homozygous and/or hemizygous individual. This variant has not been reported in the literature in individuals affected with GPC3-related conditions. ClinVar contains an entry for this variant (Variation ID: 578546). 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 GPC3 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

Pathogenic

0.99

BayesDel_addAF

Benign

-0.073

BayesDel_noAF

Uncertain

-0.080

CADD

Pathogenic

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.48

T;.

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.83

T;D

M_CAP

Benign

0.071

MetaRNN

Benign

0.25

T;T

MetaSVM

Benign

-0.80

MutationAssessor

Benign

1.5

L;L

PhyloP100

9.4

PrimateAI

Pathogenic

0.82

PROVEAN

Uncertain

-2.7

D;D

REVEL

Uncertain

0.30

Sift

Uncertain

0.020

D;D

Sift4G

Uncertain

0.0050

D;D

Vest4

0.67

ClinPred

0.47

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.71

gMVP

0.89

Mutation Taster

=61/39

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over