X-133303052-C-A

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_001448.3(GPC4):c.1486G>T(p.Glu496Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: GPC4 NM_001448.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 1.61

Genes affected

GPC4 (HGNC:4452): (glypican 4) 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 GPC4 gene is adjacent to the 3' end of GPC3 and may also play a role in Simpson-Golabi-Behmel syndrome. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 4 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-133303052-C-A is Pathogenic according to our data. Variant chrX-133303052-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 547177.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GPC4	NM_001448.3	c.1486G>T	p.Glu496Ter	stop_gained	9/9	ENST00000370828.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GPC4	ENST00000370828.4	c.1486G>T	p.Glu496Ter	stop_gained	9/9	1	NM_001448.3	P1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

Keipert syndrome Pathogenic:3

Pathogenic, criteria provided, single submitter	curation	SIB Swiss Institute of Bioinformatics	Oct 02, 2019	This variant is interpreted as a Pathogenic for Keipert syndrome, X-linked recessive. The following ACMG Tag(s) were applied: PM2, PS3-Moderate, PM1, PVS1-Strong. -
Pathogenic, no assertion criteria provided	research	Neurogenetics Research; Murdoch Childrens Research Institute	Feb 01, 2018	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jun 14, 2019	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.62
Cadd	Pathogenic	37
Dann	Uncertain	1.0
FATHMM_MKL	Uncertain	0.94	D
MutationTaster	Benign	1.0	D;D
Vest4		0.71
GERP RS		5.6

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

Publications

LitVar

Other links and lift over

dbSNP: rs1556022644; hg19: chrX-132437080;