Genetic Variant NM_004484.4:c.1068A>C (chrX-133699993-T-G) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_004484.4(GPC3):c.1068A>C(p.Gln356His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000928 in 1,077,198 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. Q356Q) has been classified as Benign.

Frequency

Genomes: not found (cov: 23)

Exomes 𝑓: 9.3e-7 ( 0 hom. 0 hem. )

Consequence

GPC3
NM_004484.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -1.19

Publications

0 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: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.27616826).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPC3	NM_004484.4 link	c.1068A>C	p.Gln356His	missense_variant	Exon 4 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.1068A>C	p.Gln356His	missense_variant	Exon 4 of 8	1	NM_004484.4	ENSP00000359854.3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

9.28e-7

AC:

AN:

1077198

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

343880

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26023

American (AMR)

AF:

0.00

AC:

AN:

34970

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19215

East Asian (EAS)

AF:

0.00

AC:

AN:

30102

South Asian (SAS)

AF:

0.00

AC:

AN:

53120

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40497

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3981

European-Non Finnish (NFE)

AF:

0.00000121

AC:

AN:

823906

Other (OTH)

AF:

0.00

AC:

AN:

45384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.25

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.59

CADD

Benign

0.12

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.36

T;.;.

FATHMM_MKL

Benign

0.086

LIST_S2

Uncertain

0.86

D;D;D

M_CAP

Benign

0.026

MetaRNN

Benign

0.28

T;T;T

MetaSVM

Benign

-0.99

MutationAssessor

Benign

1.7

L;.;.

PhyloP100

-1.2

PrimateAI

Uncertain

0.67

PROVEAN

Benign

-1.6

N;N;.

REVEL

Benign

0.14

Sift

Benign

0.088

T;T;.

Sift4G

Uncertain

0.039

D;D;D

Polyphen

0.15

B;.;.

Vest4

0.38

MutPred

0.56

Loss of MoRF binding (P = 0.1688);.;.;

MVP

0.58

MPC

0.66

ClinPred

0.65

GERP RS

-9.0

Varity_R

0.16

gMVP

0.33

Mutation Taster

=80/20

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over