rs753650660

Positions:

chr16-574151-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_004204.5(PIGQ):c.77A>G(p.Glu26Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000093 in 1,612,316 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 34)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

PIGQ
NM_004204.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.70

Variant links:

Genes affected

PIGQ (HGNC:14135): (phosphatidylinositol glycan anchor biosynthesis class Q) This gene is involved in the first step in glycosylphosphatidylinositol (GPI)-anchor biosynthesis. The GPI-anchor is a glycolipid found on many blood cells and serves to anchor proteins to the cell surface. This gene encodes a N-acetylglucosaminyl transferase component that is part of the complex that catalyzes transfer of N-acetylglucosamine (GlcNAc) from UDP-GlcNAc to phosphatidylinositol (PI). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2012]

PIGQ links:

ENSG00000282907 (HGNC:):

ENSG00000282907 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.09174153).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PIGQ	NM_004204.5 linkuse as main transcript	c.77A>G	p.Glu26Gly	missense_variant	2/11	ENST00000321878.10	NP_004195.2	Q9BRB3-2B2RAU6
PIGQ	NM_148920.4 linkuse as main transcript	c.77A>G	p.Glu26Gly	missense_variant	2/10		NP_683721.1	Q9BRB3-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PIGQ	ENST00000321878.10 linkuse as main transcript	c.77A>G	p.Glu26Gly	missense_variant	2/11	1	NM_004204.5	ENSP00000326674.6		Q9BRB3-2

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152222

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000323

AC:

AN:

247826

Hom.:

AF XY:

0.0000446

AC XY:

AN XY:

134582

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000163

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000179

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.00000890

AC:

AN:

1460094

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

726428

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152222

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74368

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.0000412

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Epilepsy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 16, 2017

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 output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The glycine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with PIGQ-related disease. This variant is present in population databases (rs753650660, ExAC 0.02%). This sequence change replaces glutamic acid with glycine at codon 26 of the PIGQ protein (p.Glu26Gly). The glutamic acid residue is weakly conserved and there is a moderate physicochemical difference between glutamic acid and glycine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.43

CADD

Benign

DANN

Benign

0.89

DEOGEN2

Benign

0.032

T;.;.;.;.;T;.

Eigen

Benign

-0.40

Eigen_PC

Benign

-0.24

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.79

T;.;T;T;T;T;T

M_CAP

Benign

0.015

MetaRNN

Benign

0.092

T;T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.2

.;L;L;.;.;L;L

PrimateAI

Benign

0.45

PROVEAN

Uncertain

-2.5

D;N;N;D;D;N;D

REVEL

Benign

0.076

Sift

Benign

0.30

T;T;T;T;T;T;T

Sift4G

Benign

0.42

T;T;T;T;T;T;T

Polyphen

0.0010, 0.026, 0.0090

.;B;B;.;.;B;B

Vest4

0.14, 0.17, 0.19, 0.18

MutPred

0.25

Loss of solvent accessibility (P = 0.0187);Loss of solvent accessibility (P = 0.0187);Loss of solvent accessibility (P = 0.0187);Loss of solvent accessibility (P = 0.0187);Loss of solvent accessibility (P = 0.0187);Loss of solvent accessibility (P = 0.0187);Loss of solvent accessibility (P = 0.0187);

MVP

0.62

MPC

0.16

ClinPred

0.045

GERP RS

4.1

Varity_R

0.062

gMVP

0.54

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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