NM_004484.4:c.39G>T

Variant names:

• chrX-133985411-C-A
• rs1057522079
• NM_004484.4:c.39G>T

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 2P and 11B. PM2 BP4_Moderate BP6_Very_Strong BP7

The NM_004484.4(GPC3):​c.39G>T​(p.Ala13Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000028 in 1,071,504 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. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. A13A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 24)
  • Exomes 𝑓: 0.0000028 (0 hom. 0 hem.)
• Consequence: GPC3 NM_004484.4 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 1.02
• Publications: 0 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: Benign. The variant received -9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.26).
• BP6: Variant X-133985411-C-A is Benign according to our data. Variant chrX-133985411-C-A is described in ClinVar as Likely_benign. ClinVar VariationId is 384933.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=1.02 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPC3	NM_004484.4	c.39G>T	p.Ala13Ala	synonymous_variant	Exon 1 of 8	ENST00000370818.8	NP_004475.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPC3	ENST00000370818.8	c.39G>T	p.Ala13Ala	synonymous_variant	Exon 1 of 8	1	NM_004484.4	ENSP00000359854.3

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD2 exomes AF: 0.0000228 AC: 3 AN: 131769 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000976

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000378

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000280 AC: 3 AN: 1071504 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 347706

African (AFR) AF: 0.00 AC: 0 AN: 25796

American (AMR) AF: 0.00 AC: 0 AN: 31274

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 18859

East Asian (EAS) AF: 0.0000348 AC: 1 AN: 28770

South Asian (SAS) AF: 0.00 AC: 0 AN: 51076

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 38012

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3776

European-Non Finnish (NFE) AF: 0.00000121 AC: 1 AN: 828888

Other (OTH) AF: 0.0000222 AC: 1 AN: 45053

GnomAD4 genome Cov.: 24

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

Mar 30, 2016

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Wilms tumor 1 Benign:1

Jul 15, 2024

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
BayesDel_noAF	Benign	-0.26
CADD	Benign	15
DANN	Benign	0.93
PhyloP100		1.0
PromoterAI		0.017	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6

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: rs1057522079; hg19: chrX-133119438;