Genetic Variant NM_176787.5:c.2693T>C (chr18-62045959-A-G) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_176787.5(PIGN):c.2693T>C(p.Val898Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V898F) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Consequence

PIGN
NM_176787.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.39

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

multiple congenital anomalies-hypotonia-seizures syndrome 1
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, G2P, Labcorp Genetics (formerly Invitae), ClinGen
Fryns syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

PIGN links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.36407724).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_176787.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
PIGN	NM_176787.5	MANE Select	c.2693T>C	p.Val898Ala	missense	Exon 31 of 31	NP_789744.1	O95427
PIGN	NM_001438896.1		c.2810T>C	p.Val937Ala	missense	Exon 32 of 32	NP_001425825.1
PIGN	NM_012327.6		c.2693T>C	p.Val898Ala	missense	Exon 30 of 30	NP_036459.1	O95427

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
PIGN	ENST00000640252.2	TSL:1 MANE Select	c.2693T>C	p.Val898Ala	missense	Exon 31 of 31	ENSP00000492233.1	O95427
PIGN	ENST00000400334.7	TSL:1	c.2693T>C	p.Val898Ala	missense	Exon 30 of 30	ENSP00000383188.2	O95427
PIGN	ENST00000638424.1	TSL:5	n.*661T>C		non_coding_transcript_exon	Exon 29 of 29	ENSP00000491963.1	A0A1W2PQZ1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

ClinVar submissions

Significance:Uncertain significance

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

Multiple congenital anomalies-hypotonia-seizures syndrome 1 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.37

BayesDel_addAF

Uncertain

0.043

BayesDel_noAF

Benign

-0.18

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.015

Eigen

Uncertain

0.31

Eigen_PC

Uncertain

0.40

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.94

M_CAP

Benign

0.012

MetaRNN

Benign

0.36

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.88

PhyloP100

7.4

PrimateAI

Uncertain

0.71

PROVEAN

Benign

0.57

REVEL

Benign

0.21

Sift

Benign

1.0

Sift4G

Benign

0.50

Polyphen

0.90

Vest4

0.71

MutPred

0.35

Loss of stability (P = 0.1466)

MVP

0.46

MPC

0.070

ClinPred

0.95

GERP RS

5.2

Varity_R

0.084

gMVP

0.46

Mutation Taster

=59/41

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over