X-15321580-G-A

Position:

chrX-15321580-G-A

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBP6BS2

The NM_002641.4(PIGA):c.1381C>T(p.Arg461Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000743 in 1,198,244 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 31 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R461Q) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000036 ( 0 hom., 0 hem., cov: 24)

Exomes 𝑓: 0.000078 ( 0 hom. 31 hem. )

Consequence

PIGA
NM_002641.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:2

Conservation

PhyloP100: 1.04

Variant links:

Genes affected

PIGA (HGNC:8957): (phosphatidylinositol glycan anchor biosynthesis class A) This gene encodes a protein required for synthesis of N-acetylglucosaminyl phosphatidylinositol (GlcNAc-PI), the first intermediate in the biosynthetic pathway of GPI anchor. The GPI anchor is a glycolipid found on many blood cells and which serves to anchor proteins to the cell surface. Paroxysmal nocturnal hemoglobinuria, an acquired hematologic disorder, has been shown to result from mutations in this gene. Alternate splice variants have been characterized. A related pseudogene is located on chromosome 12. [provided by RefSeq, Jun 2010]

PIGA links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.08955622).

BP6

Variant X-15321580-G-A is Benign according to our data. Variant chrX-15321580-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 681365.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=1}.

BS2

High Hemizygotes in GnomAdExome4 at 31 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PIGA	NM_002641.4 linkuse as main transcript	c.1381C>T	p.Arg461Trp	missense_variant	6/6	ENST00000333590.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PIGA	ENST00000333590.6 linkuse as main transcript	c.1381C>T	p.Arg461Trp	missense_variant	6/6	1	NM_002641.4	P1	P37287-1

Frequencies

GnomAD3 genomes

AF:

0.0000357

AC:

AN:

112064

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34278

show subpopulations

Gnomad AFR

AF:

0.0000325

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000361

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000376

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000436

AC:

AN:

183487

Hom.:

AF XY:

0.0000442

AC XY:

AN XY:

67927

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:

0.000105

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000732

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000783

AC:

AN:

1086128

Hom.:

Cov.:

AF XY:

0.0000881

AC XY:

AN XY:

351790

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000331

Gnomad4 SAS exome

AF:

0.000297

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000698

Gnomad4 OTH exome

AF:

0.000197

GnomAD4 genome

AF:

0.0000357

AC:

AN:

112116

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34340

show subpopulations

Gnomad4 AFR

AF:

0.0000324

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000362

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000376

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

PIGA-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 15, 2022

The PIGA c.1381C>T variant is predicted to result in the amino acid substitution p.Arg461Trp. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.010% of alleles in individuals of South Asian descent in gnomAD, including three hemizygous individuals of European (Non-Finnish) descent (http://gnomad.broadinstitute.org/variant/X-15339702-G-A). Although we suspect that this variant may be benign, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Multiple congenital anomalies-hypotonia-seizures syndrome 2

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 24, 2023

- -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Apr 02, 2018

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.37

BayesDel_noAF

Benign

-0.56

CADD

Benign

8.5

DANN

Uncertain

0.99

DEOGEN2

Benign

0.27

T;T;T;.;.;.

FATHMM_MKL

Benign

0.17

LIST_S2

Benign

0.82

.;T;T;T;T;T

M_CAP

Benign

0.016

MetaRNN

Benign

0.090

T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.9

L;L;.;.;.;.

MutationTaster

Benign

1.0

N;N;N

PrimateAI

Benign

0.19

PROVEAN

Benign

-1.7

N;.;.;.;.;.

REVEL

Benign

0.11

Sift

Uncertain

0.0020

D;.;.;.;.;.

Sift4G

Uncertain

0.011

D;D;.;D;D;.

Polyphen

0.94

P;P;.;.;D;.

Vest4

0.12

MutPred

0.39

Loss of disorder (P = 0.0244);Loss of disorder (P = 0.0244);.;.;.;.;

MVP

0.29

MPC

0.88

ClinPred

0.064

GERP RS

0.33

Varity_R

0.10

gMVP

0.67

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