X-133699931-T-C

Variant names:

• chrX-133699931-T-C
• rs1060502172
• NM_004484.4:c.1130A>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Moderate BP6_Moderate

The NM_004484.4(GPC3):​c.1130A>G​(p.His377Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H377P) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 23)
• Consequence: GPC3 NM_004484.4 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.328
• Publications: 2 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.083073676).
• BP6: Variant X-133699931-T-C is Benign according to our data. Variant chrX-133699931-T-C is described in ClinVar as Likely_benign. ClinVar VariationId is 408891.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPC3	NM_004484.4	c.1130A>G	p.His377Arg	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	c.1130A>G	p.His377Arg	missense_variant	Exon 4 of 8	1	NM_004484.4	ENSP00000359854.3

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 23

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Wilms tumor 1 Benign:1

Jun 01, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.39	T
BayesDel_noAF	Benign	-0.80
CADD	Benign	2.8
DANN	Benign	0.45
DEOGEN2	Benign	0.31	T;.;.
FATHMM_MKL	Benign	0.57	D
LIST_S2	Benign	0.56	T;T;T
M_CAP	Benign	0.0077	T
MetaRNN	Benign	0.083	T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.2	L;.;.
PhyloP100		-0.33
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.90	N;N;.
REVEL	Benign	0.059
Sift	Benign	0.70	T;T;.
Sift4G	Benign	0.66	T;T;T
Polyphen		0.0010	B;.;.
Vest4		0.17
MutPred		0.53		Loss of methylation at K374 (P = 0.1461);.;.;
MVP		0.52
MPC		0.22
ClinPred		0.023	T
GERP RS		-1.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.086
gMVP		0.17
Mutation Taster		=75/25	polymorphism

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

Other links and lift over

dbSNP: rs1060502172; hg19: chrX-132833959;