16-576204-G-A

Position:

chr16-576204-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2PP3_ModerateBS1_Supporting

The NM_004204.5(PIGQ):c.892G>A(p.Gly298Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000587 in 1,550,322 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/23 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: 0.000064 ( 0 hom. )

Consequence

PIGQ
NM_004204.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.39

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:

Genome browser will be placed here

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

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

BS1

Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.0000637 (89/1398096) while in subpopulation EAS AF= 0.00184 (66/35830). AF 95% confidence interval is 0.00148. There are 0 homozygotes in gnomad4_exome. There are 34 alleles in male gnomad4_exome subpopulation. Median coverage is 34. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PIGQ	NM_004204.5 linkuse as main transcript	c.892G>A	p.Gly298Arg	missense_variant	4/11	ENST00000321878.10	NP_004195.2
PIGQ	NM_148920.4 linkuse as main transcript	c.892G>A	p.Gly298Arg	missense_variant	4/10		NP_683721.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PIGQ	ENST00000321878.10 linkuse as main transcript	c.892G>A	p.Gly298Arg	missense_variant	4/11	1	NM_004204.5	ENSP00000326674	P1	Q9BRB3-2

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000194

AC:

AN:

154298

Hom.:

AF XY:

0.0000123

AC XY:

AN XY:

81408

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000263

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000637

AC:

AN:

1398096

Hom.:

Cov.:

AF XY:

0.0000493

AC XY:

AN XY:

689698

show subpopulations

Gnomad4 AFR exome

AF:

0.0000947

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00184

Gnomad4 SAS exome

AF:

0.0000378

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000148

Gnomad4 OTH exome

AF:

0.0000172

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152226

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74372

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.00000989

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

Dec 06, 2022

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 sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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 arginine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 456056). This variant has not been reported in the literature in individuals affected with PIGQ-related conditions. This variant is present in population databases (rs750484214, gnomAD 0.03%). This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 298 of the PIGQ protein (p.Gly298Arg). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.56

CADD

Benign

8.3

DANN

Benign

0.34

DEOGEN2

Benign

0.024

.;.;.;T

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.59

LIST_S2

Benign

0.82

.;T;T;T

M_CAP

Benign

0.010

MetaRNN

Benign

0.021

T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-2.0

N;N;.;N

MutationTaster

Benign

1.0

D;N;N;N

PrimateAI

Benign

0.25

PROVEAN

Benign

-0.33

N;N;N;N

REVEL

Benign

0.063

Sift

Benign

0.64

T;T;T;T

Sift4G

Benign

1.0

T;T;T;T

Polyphen

0.0010

B;B;.;B

Vest4

0.16

MutPred

0.61

Gain of MoRF binding (P = 0.0168);Gain of MoRF binding (P = 0.0168);Gain of MoRF binding (P = 0.0168);Gain of MoRF binding (P = 0.0168);

MVP

0.28

MPC

0.17

ClinPred

0.017

GERP RS

-2.4

Varity_R

0.036

gMVP

0.28

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.83

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.83

Position offset: 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