chr18-62157207-C-G

Variant names:

Variant summary

Our verdict is Benign. Variant got -11 ACMG points: 0P and 11B. BP4_ModerateBP6BS1BS2

The NM_176787.5(PIGN):c.364G>C(p.Glu122Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000602 in 1,605,066 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00051 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00061 ( 4 hom. )

Consequence

PIGN
NM_176787.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:4

Conservation

PhyloP100: 7.75

Variant links:

Genes affected

PIGN (HGNC:8967): (phosphatidylinositol glycan anchor biosynthesis class N) This gene encodes a protein that is involved 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 protein is expressed in the endoplasmic reticulum and transfers phosphoethanolamine (EtNP) to the first mannose of the GPI anchor. Two alternatively spliced variants, which encode an identical isoform, have been reported. [provided by RefSeq, Jul 2008]

PIGN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -11 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.11295295).

BP6

Variant 18-62157207-C-G is Benign according to our data. Variant chr18-62157207-C-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 218858.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=1, Uncertain_significance=2}. Variant chr18-62157207-C-G is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.000611 (888/1452802) while in subpopulation MID AF= 0.0101 (58/5744). AF 95% confidence interval is 0.00802. There are 4 homozygotes in gnomad4_exome. There are 526 alleles in male gnomad4_exome subpopulation. Median coverage is 27. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PIGN	NM_176787.5 link	c.364G>C	p.Glu122Gln	missense_variant	Exon 6 of 31	ENST00000640252.2	NP_789744.1	O95427A0A024R2C3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
PIGN	ENST00000640252.2 link	c.364G>C	p.Glu122Gln	missense_variant	Exon 6 of 31	1	NM_176787.5	ENSP00000492233.1	O95427
PIGN	ENST00000400334.7 link	c.364G>C	p.Glu122Gln	missense_variant	Exon 5 of 30	1		ENSP00000383188.2	O95427
PIGN	ENST00000638424.1 link	n.364G>C		non_coding_transcript_exon_variant	Exon 4 of 29	5		ENSP00000491963.1	A0A1W2PQZ1

Frequencies

GnomAD3 genomes

AF:

0.000513

AC:

AN:

152146

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000524

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000828

Gnomad FIN

AF:

0.000471

Gnomad MID

AF:

0.00955

Gnomad NFE

AF:

0.000735

Gnomad OTH

AF:

0.00143

GnomAD3 exomes

AF:

0.000737

AC:

178

AN:

241568

Hom.:

AF XY:

0.000880

AC XY:

115

AN XY:

130658

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000504

Gnomad ASJ exome

AF:

0.000101

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00109

Gnomad FIN exome

AF:

0.000567

Gnomad NFE exome

AF:

0.000990

Gnomad OTH exome

AF:

0.00137

GnomAD4 exome

AF:

0.000611

AC:

888

AN:

1452802

Hom.:

Cov.:

AF XY:

0.000728

AC XY:

526

AN XY:

722566

show subpopulations

Gnomad4 AFR exome

AF:

0.000390

Gnomad4 AMR exome

AF:

0.000542

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00102

Gnomad4 FIN exome

AF:

0.000528

Gnomad4 NFE exome

AF:

0.000553

Gnomad4 OTH exome

AF:

0.00110

GnomAD4 genome

AF:

0.000512

AC:

AN:

152264

Hom.:

Cov.:

AF XY:

0.000537

AC XY:

AN XY:

74454

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.000523

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000829

Gnomad4 FIN

AF:

0.000471

Gnomad4 NFE

AF:

0.000735

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.000813

Hom.:

Bravo

AF:

0.000567

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000274

AC:

ESP6500EA

AF:

0.000491

AC:

ExAC

AF:

0.000712

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3472

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Benign:2

Jan 29, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant does not alter protein structure/function -

Jun 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PIGN: BS2 -

not specified

Uncertain:1

May 11, 2015

Genomic Diagnostic Laboratory, Division of Genomic Diagnostics, Children's Hospital of Philadelphia

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases

Uncertain:1

Jun 27, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.364G>C (p.E122Q) alteration is located in exon 6 (coding exon 3) of the PIGN gene. This alteration results from a G to C substitution at nucleotide position 364, causing the glutamic acid (E) at amino acid position 122 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Multiple congenital anomalies-hypotonia-seizures syndrome 1

Benign:1

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

PIGN-related disorder

Benign:1

Jun 24, 2024

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Benign

-0.20

BayesDel_noAF

Benign

-0.11

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.036

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

Eigen

Pathogenic

0.78

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.94

.;.;.;.;.;.;D;.;D;D;.;D;D;.;D;D;D;D;.;.;D;D;D;D;D;.;D;D;D

M_CAP

Benign

0.024

MetaRNN

Benign

0.11

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

MetaSVM

Benign

-0.82

MutationAssessor

Pathogenic

3.1

M;.;M;M;M;.;.;.;.;.;M;.;.;M;.;M;.;.;.;.;.;.;.;.;.;.;.;.;.

PrimateAI

Uncertain

0.65

PROVEAN

Benign

-1.7

.;.;.;N;.;.;.;.;.;.;N;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.

REVEL

Benign

0.19

Sift

Benign

0.045

.;.;.;D;.;.;.;.;.;.;D;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.

Sift4G

Uncertain

0.039

.;.;.;D;.;.;.;.;.;.;D;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;T;.

Polyphen

0.99

D;.;D;D;D;.;.;.;.;.;D;.;.;D;.;D;.;.;.;.;.;.;.;.;.;.;.;.;.

Vest4

0.41

MVP

0.77

MPC

0.17

ClinPred

0.14

GERP RS

5.4

Varity_R

0.26

gMVP

0.70

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