NM_001448.3:c.1518_1521dupGTGC

Variant names:

• chrX-133303016-G-GGCAC
• rs1569339879
• NM_001448.3:c.1518_1521dupGTGC

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PVS1_Moderate PM2 PP5

The NM_001448.3(GPC4):​c.1518_1521dupGTGC​(p.Pro508ValfsTer6) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 23)
• Consequence: GPC4 NM_001448.3 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 0.215
• Publications: 0 publications found

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]

GPC4 Gene-Disease associations (from GenCC):

• Keipert syndrome

  Inheritance: XLR, XL Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 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. Fraction of 0.0898 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-133303016-G-GGCAC is Pathogenic according to our data. Variant chrX-133303016-G-GGCAC is described in ClinVar as Pathogenic. ClinVar VariationId is 626360.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001448.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GPC4	NM_001448.3	MANE Select	c.1518_1521dupGTGC	p.Pro508ValfsTer6	frameshift	Exon 9 of 9	NP_001439.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GPC4	ENST00000370828.4	TSL:1 MANE Select	c.1518_1521dupGTGC	p.Pro508ValfsTer6	frameshift	Exon 9 of 9	ENSP00000359864.3	O75487-1
	GPC4	ENST00000887818.1		c.1518_1521dupGTGC	p.Pro508ValfsTer6	frameshift	Exon 10 of 10	ENSP00000557877.1
	GPC4	ENST00000931828.1		c.1518_1521dupGTGC	p.Pro508ValfsTer6	frameshift	Exon 10 of 10	ENSP00000601887.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Keipert syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.21
Mutation Taster		=4/196	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs1569339879; hg19: chrX-132437044;