Genetic Variant GPC6:p.Arg126Trp (chr13-93830210-C-T) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_005708.5(GPC6):c.376C>T(p.Arg126Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000337 in 1,454,724 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.000034 ( 0 hom. )

Consequence

GPC6
NM_005708.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.12

Variant links:

Genes affected

GPC6 (HGNC:4454): (glypican 6) The glypicans comprise a family of glycosylphosphatidylinositol-anchored heparan sulfate proteoglycans, and they have been implicated in the control of cell growth and cell division. The glypican encoded by this gene is a putative cell surface coreceptor for growth factors, extracellular matrix proteins, proteases and anti-proteases. Mutations in this gene are associated with omodysplasia 1. [provided by RefSeq, Nov 2016]

GPC6 links:

GPC6-AS2 (HGNC:39910): (GPC6 antisense RNA 2)

GPC6-AS2 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.834

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPC6	NM_005708.5 link	c.376C>T	p.Arg126Trp	missense_variant	Exon 3 of 9	ENST00000377047.9	NP_005699.1	Q9Y625
GPC6	XM_017020300.2 link	c.166C>T	p.Arg56Trp	missense_variant	Exon 3 of 9		XP_016875789.1
GPC6	XM_047429990.1 link	c.166C>T	p.Arg56Trp	missense_variant	Exon 3 of 9		XP_047285946.1
GPC6-AS2	NR_046536.1 link	n.380+606G>A		intron_variant	Intron 5 of 6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPC6	ENST00000377047.9 link	c.376C>T	p.Arg126Trp	missense_variant	Exon 3 of 9	1	NM_005708.5	ENSP00000366246.3		Q9Y625
GPC6-AS2	ENST00000445540.1 link	n.228+606G>A		intron_variant	Intron 2 of 2	5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000202

AC:

AN:

247866

Hom.:

AF XY:

0.0000299

AC XY:

AN XY:

133980

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000587

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000267

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000337

AC:

AN:

1454724

Hom.:

Cov.:

AF XY:

0.0000373

AC XY:

AN XY:

723340

show subpopulations

Gnomad4 AFR exome

AF:

0.0000301

Gnomad4 AMR exome

AF:

0.0000452

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000253

Gnomad4 SAS exome

AF:

0.0000117

Gnomad4 FIN exome

AF:

0.0000188

Gnomad4 NFE exome

AF:

0.0000379

Gnomad4 OTH exome

AF:

0.0000167

GnomAD4 genome

Cov.:

Alfa

AF:

0.000132

Hom.:

Bravo

AF:

0.0000264

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Aug 31, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is present in population databases (rs763966830, ExAC 0.02%). This sequence change replaces arginine with tryptophan at codon 126 of the GPC6 protein (p.Arg126Trp). The arginine residue is moderately conserved and there is a moderate physicochemical difference between arginine and tryptophan. This variant has not been reported in the literature in individuals affected with GPC6-related conditions. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.75

BayesDel_addAF

Benign

-0.031

BayesDel_noAF

Benign

-0.11

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.36

Eigen

Uncertain

0.55

Eigen_PC

Uncertain

0.47

FATHMM_MKL

Benign

0.74

LIST_S2

Benign

0.85

M_CAP

Benign

0.048

MetaRNN

Pathogenic

0.83

MetaSVM

Uncertain

0.030

MutationAssessor

Pathogenic

3.0

PrimateAI

Pathogenic

0.92

PROVEAN

Uncertain

-4.0

REVEL

Uncertain

0.30

Sift

Uncertain

0.0070

Sift4G

Uncertain

0.0060

Polyphen

1.0

Vest4

0.80

MVP

0.92

MPC

0.93

ClinPred

0.88

GERP RS

4.7

Varity_R

0.38

gMVP

0.66

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over